Activated Carbon Particles Research Articles

Anthocyanin-Sensitized TiO2 Nanoparticles for Phenazopyridine Photodegradation under Solar Simulated Light

Pharmaceutical wastes are emerging as water contaminants. Like other organic contaminants, it is necessary to find safe and economic methods to remove them from the water. In this work, anthocyanin was used as a natural dye sensitizer for the wide band gap nanosize rutile TiO2. The TiO2/Anthocyanin particles were supported on activated carbon particle surfaces. The resulting composite, which was prepared and characterized by different methods, was then used as a catalyst in the photodegradation of phenazopyridine (a model pharmaceutical contaminant) under a solar simulated light. Depending on experimental conditions, up to 90% of the contaminant was mineralized leaving no new organic products in the reaction mixture. The results show the feasibility of using the activated carbon-supported TiO2/Anthocyanin photocatalyst for pharmaceutical contaminant removal in water. The natural dye anthocyanin readily sensitized the TiO2 to visible light. The unsupported TiO2, with its nanosize particles, was not easy to recover by simple separation methods, while the activated carbon-supported catalyst was easily isolated by decantation after reaction cessation. Moreover, the recovered AC/TiO2 catalyst could also be regenerated by adding fresh anthocyanin sensitizer after recovery for further reuse. Keeping the contaminant molecules closer to the catalytic sites by adsorption, the support also enhanced the efficiency of photocatalyst.

Bioturbation facilitates DDT sequestration by activated carbon against recontamination by sediment deposition

We evaluated bioturbation as a facilitator for in situ treatment with a thin layer of activated carbon to treat dichlorodiphenyltrichloroethane (DDT)-contaminated sediment and contaminant influx by sediment deposition. Using the freshwater worm Lumbriculus variegatus as a bioturbator, microcosm time-series studies were conducted for 4 mo and monitored for DDT flux and porewater concentration profiles by polyethylene passive samplers. With bioturbators present, the thin-layer activated carbon amendment reduced DDT flux by >90% compared with the same simulated scenario without activated carbon amendment. In contrast, a clean sediment cap without activated carbon was ineffective in reducing flux when bioturbation was present. In simulated scenarios with contaminant influx through deposition of contaminated sediment, bioturbation facilitated in situ activated carbon treatment, reducing 4-mo DDT flux by 77% compared with the same scenario without bioturbation. Porewater concentration profiles and activated carbon dose profiles confirmed effective mixing of activated carbon particles down to 1-cm depth. A mass transfer model was developed to predict flux with consideration of bioturbation and sediment deposition processes. Predicted flux values were consistent with experimental results and confirm that bioturbation activity helps reduce DDT sediment-to-water fluxes in activated carbon-treated sediment with recontamination by contaminated sediment deposition. To our knowledge, this is the first study to combine experimental and modeling results showing how bioturbation enhances activated carbon amendment effectiveness against ongoing contaminant influx by sediment deposition. Environ Toxicol Chem 2018;37:2013-2021. © 2018 SETAC.

Double layer mixed matrix membrane adsorbers improving capacity and safety hemodialysis

Double layer mixed matrix membranes adsorbers have been developed for blood toxin removal by embedding activated carbon into cellulose acetate macroporous membranes. The membranes are prepared by phase inversion method via water vapor induced phase separation followed by an immersion precipitation step. Double layer MMM consisting of an active support and a separating layer. The active support layer consists of activated carbon particles embedded in macroporous cellulose acetate; the separating layer consists of particle free cellulose acetate. The double layer membrane possess an open and interconnected macroporous structure with a high loading of activated carbon available for blood toxins removal. The MMM AC has a swelling degree of 6.5 %, porosity of 53 % and clean water flux of 800 Lm-2h-1bar-1. The prepared membranes show a high dynamic Creatinine (Crt) removal during hemodilysis process. The Crt removal by adsorption contributes to amore than 83 % of the total removal. The double layer adsorptive membrane proves hemodialysis membrane can integrated with adsorption, in which blood toxins are removed in one step.

Synthesis of carbon monoliths with a tailored hierarchical pore structure for selective CO2 capture

Carbon monolithic adsorbents exhibiting a hierarchical pore structure are produced via a synthesis route based on the stabilization of liquid foams followed by a carbonization step. The macro-microporous structure is achieved by the incorporation of microporous, biomass-derived activated carbon particles in the liquid foam enclosed by a cationic surfactant as stabilizer. This method yields crack-free monoliths (solid foams) with a compressive strength of the order of 20 kPa. The microstructure and the textural properties of the final solid foams have been investigated by means of Scanning Electron Microscopy (SEM) and gas adsorption. The behavior as selective CO2 adsorbents at 25 °C has been evaluated using breakthrough experiments under simulated post-combustion conditions (16% V/V CO2/N2), resulting in a selectivity factor of 13 over N2. The hierarchical pore structure of the monoliths allows a rapid transport of the gas mixture through the macropores with no appreciable pressure drop, retaining more than 90 % of the adsorption capacity (∼ 0.868 mmol/g) after several adsorption/desorption cycles. Moreover, the monolith has shown a CO2 uptake capacity of 2.62 mmol/g under static condition at 1 bar and 25 °C. This study provides guidelines for the design of carbon-based foams decorated with carbon particles, which have morphological and textural properties that can be carefully selected for any gas-selective capture application.

Application of iron-loaded activated carbon electrodes for electrokinetic remediation of chromium-contaminated soil in a three-dimensional electrode system

Hexavalent chromium from industrial residues is highly mobile in soil and can lead to the contamination of groundwater through runoff and leaching after rainfall. This paper focuses on the three-dimensional (3D) electrokinetic remediation (EKR) of chromium-contaminated soil from an industrial site. Activated carbon particles coupled with Fe ions (AC-Fe) were used as the third electrode. The optimum dose ratio of the electrode particles and remediation time were selected on the basis of single-factor experiments. X-ray photoelectron spectroscopy (XPS) analysis was carried out to explore the reduction of Cr(VI) on the surface of the electrode particles (AC-Fe). The results showed that AC-Fe had a positive effect on Cr(VI) reduction with a removal rate of 80.2%, which was achieved after 10 d by using a 5% dose of electrode particles. Finally, it was concluded that the removal mechanism combined the processes of electromigration, electrosorption/adsorption and reduction of Cr(VI) in the 3D EKR system.

A multiscale model for carbon adsorption of BTX compounds: Comparison of volume averaging theory and experimental measurements

In this work, the method of volume averaging is applied for the mathematical modeling of transport and adsorption of benzene, toluene, and xylene in a packed bed of activated particles. One benefit of this approach is that it allows one to directly incorporate measured microscale information into macroscale models for predicting the effective transport and adsorption process. This work is novel in that it combines two levels of upscaling and a nonlinear adsorption process. The first level of upscaling develops an effective model for the mass transport and reaction in an activated carbon particle; within the particle, only diffusion and reaction are considered because of the very small pore sizes. The second level of upscaling develops the effective model for a collection of carbon particles forming the porous medium contained in a fixed-bed reactor; here, convection, diffusion, and dispersion are considered. The resulting model resembles a classical mobile-immobile representation of the transport and adsorption process.As part of the upscaling process, we develop the homogenized transport equations and their associated effective parameters using two different averaging volume support scales (i.e., at two disparate length scales). The effective parameters are all diffusion or dispersion tensors. These include (1) the effective diffusion tensor defining diffusion in the homogenized carbon particle, (2) the effective diffusion tensor for the immobile phase in the two-region representation of the medium, and (3) the effective hydrodynamic dispersion tensor (which included diffusion and dispersion) for the mobile region of the porous catalyst bed. Each of these effective parameters are determined by numerically solving closure problems over an idealized spatially periodic model of a porous medium. One novel feature of these particular closure problems is that they describe nonlinear adsorption at the microscale, which is a problem that is not currently represented in the literature.Once derived, the two-scale, two-equation mobile-immobile model was applied to predict experimentally-measured concentration breakthrough curves from packed bed columns with activated carbon from coconut shell as the adsorbent to the removal of petrochemical contaminants (BTX) by adsorption. There were no adjustable parameters in this modeling effort; the only modeling choice was whether the mass transfer coefficient should be computed from the correlations of Wakao and Funazkri (1978) for BTX components. The equations from closure problems and Darcy’s scale of transport of this work were discretized using the finite volumes method and the solutions are found numerically through of a computational code and some packages from the free software OpenFOAM®, version 2.2.x.This work has been selected by the Editors as a Featured Cover Article for this issue.

Identifying, counting, and characterizing superfine activated-carbon particles remaining after coagulation, sedimentation, and sand filtration

Superfine powdered activated carbon (SPAC; particle diameter ∼1 μm) has greater adsorptivity for organic molecules than conventionally sized powdered activated carbon (PAC). Although SPAC is currently used in the pretreatment to membrane filtration at drinking water purification plants, it is not used in conventional water treatment consisting of coagulation–flocculation, sedimentation, and rapid sand filtration (CSF), because it is unclear whether CSF can adequately remove SPAC from the water. In this study, we therefore investigated the residual SPAC particles in water after CSF treatment. First, we developed a method to detect and quantify trace concentration of carbon particles in the sand filtrate. This method consisted of 1) sampling particles with a membrane filter and then 2) using image analysis software to manipulate a photomicrograph of the filter so that black spots with a diameter >0.2 μm (considered to be carbon particles) could be visualized. Use of this method revealed that CSF removed a very high percentage of SPAC: approximately 5-log in terms of particle number concentrations and approximately 6-log in terms of particle volume concentrations. When waters containing 7.5-mg/L SPAC and 30-mg/L PAC, concentrations that achieved the same adsorption performance, were treated, the removal rate of SPAC was somewhat superior to that of PAC, and the residual particle number concentrations for SPAC and PAC were at the same low level (100–200 particles/mL). Together, these results suggest that SPAC can be used in place of PAC in CSF treatment without compromising the quality of the filtered water in terms of particulate matter contamination. However, it should be noted that the activated carbon particles after sand filtration were smaller in terms of particle size and were charge-neutralized to a lesser extent than the activated carbon particles before sand filtration. Therefore, the tendency of small particles to escape in the filtrate would appear to be related to the fact that their small size leads to a low destabilization rate during the coagulation process and a low collision rate during the flocculation and filtration processes.

Geobacter Dominates the Inner Layers of a Stratified Biofilm on a Fluidized Anode During Brewery Wastewater Treatment.

In this study, we designed a microbial electrochemical fluidized bed reactor (ME-FBR), with an electroconductive anodic bed made of activated carbon particles for treating a brewery wastewater. Under a batch operating mode, acetate and propionate consumption rates were 13-fold and 2.4-fold higher, respectively, when the fluidized anode was polarized (0.2 V) with respect to open circuit conditions. Operating in a continuous mode, this system could effectively treat the brewery effluent at organic loading rates (OLR) over 1.7 kg m-3NRV d-1 and with removal efficiencies of 95 ± 1.4% (hydraulic retention time of 1 day and an influent of 1.7 g-COD L-1). The coulombic efficiency values highly depended upon the OLR applied, and varied from a 56 ± 15% to 10 ± 1%. Fluorescence in situ hybridization (FISH) analysis revealed a relative high abundance of Geobacter species (ca. 20%), and clearly showed a natural microbial stratification. Interestingly, the Geobacter cluster was highly enriched in the innermost layers of the biofilm (thickness of 10 μm), which were in contact with the electroconductive particles of bed, whereas the rest of bacteria were located in the outermost layers. To our knowledge, this is the first time that such a clear microbial stratification has been observed on an anode-respiring biofilm. Our results revealed the relevant role of Geobacter in switching between the electrode and other microbial communities performing metabolic reactions in the outermost environment of the biofilm.

Aqueous Suspension for Laser Controlled Shock Wave Treatment of Skin and Mucous Membranes

The article describes an aqueous suspension of activated carbon particles containing unbound water used for treatment of dystrophic gynecological diseases. The treatment is based on the method of controlled shock wave destruction of pathological tissues using laser radiation poorly absorbed by the tissues. A technology for saturating internal micropores of activated carbon particles with unbound water and preparing the aqueous suspension is described. The results of histological in vitro studies of the zone of necrosis caused by exposure of model biological objects (mucous membrane of miniature pig vagina) to shock waves are presented. It is shown that the thickness of the necrosis zone decreases with increasing intensity of laser radiation.

Bio-regeneration of activated carbon: A comprehensive review

Abstract The use of microorganisms to regenerate activated carbon (AC), bio-generation, can avert costly and logistically challenging ex-situ steam regeneration of carbon normally required to recover its adsorptive capacity. Bio-regeneration employs microbial metabolism in which the microbes use the available organic substrates (contaminants) to generate energy. During this process, they generate equivalent protons and electrons, which are transferred to the substrates to finally break them down to simpler molecules or ions, such as CO2, methane and Cl−. The optimal microbial conditions depend on the temperature, available nitrogen and phosphorus levels, dissolved oxygen levels, and microbe/substrate stoichiometric ratios and the residence time of the AC particles within the reactor. In this review, the authors highlight the most recent development in bio-regeneration including the regeneration mechanism, the relationship between the reversibility of adsorption and the efficiency of bio-regeneration, the general aspects affecting bio-regeneration, the principle and target compounds for bio-regeneration, different established methods for quantifying the bio-regeneration and the efficiency of bio-regeneration. Few case studies of bio-regeneration of activated carbon loaded with different contaminants are presented. Research on microbiology regeneration has gained considerable attention in recent years, but it still needs more contribution from other disciplines including process engineering, biochemistry and material sciences for optimizing the process performance.

Development and Characterization of Defect-Free Matrimid® Mixed-Matrix Membranes Containing Activated Carbon Particles for Gas Separation.

In this work, mixed-matrix membranes (MMMs) for gas separation in the form of thick films were prepared via the combination of the polymer Matrimid® 5218 and activated carbons (AC). The AC particles had a mean particle size of 1.5 μm and a mean pore diameter of 1.9 nm. The films were prepared by slow solvent evaporation from casting solutions in chloroform, which had a varying polymer–AC ratio. It was possible to produce stable films with up to a content of 50 vol % of AC. Thorough characterization experiments were accomplished via differential scanning calorimetry and thermogravimetric analysis, while the morphology of the MMMs was also investigated via scanning electron microscopy. The gas transport properties were revealed by employing time-lag measurements for different pure gases as well as sorption balance experiments for the filler particles. It was found that defect free Matrimid® MMMs with AC were prepared and the increase of the filler content led to a higher effective permeability for different gases. The single gas selectivity αij of different gas pairs maintained stable values with the increase of AC content, regardless of the steep increase in the effective permeability of the pure gases. Estimation of the solubilities and the diffusivities of the Matrimid®, AC, and MMMs allowed for the explanation of the increasing permeabilities of the MMMs, with the increase of AC content by modelling.

Effects on Surface Area, Intake Capacity and Regeneration of Impregnated Palm-Shell Activated Carbon with Monoethanolamide and 2-Amino-2-Methyl- 1-Propanol Equipped For CO2 Adsorption

Granular palm shell activated carbon (AC) was impregnated separately with monoethanolamine (MEA) and 2-amino- 2-methyl-1-propanol (AMP) to improve its natural capacity and selectivity for carbon dioxide (CO2) adsorption. The total surface area, micropore volume, as well as the heterogeneity of the impregnated AC particles was considerably reduced due to impregnation. CO2 intake of impregnated 500 μm AC particles improved significantly and adsorptive capacity of 500 μm MEA-impregnated AC particles improved by 172% and 44% comparing to non-impregnated and AMP-impregnated AC particles respectively. Solid state amine stoichiometric results indicated that adsorption capacity of unhindered amine (MEA) is higher than that of hindered amine (AMP) by 50% contrary to liquid amines standard stoichiometry. Exhausted AMP-impregnated beds were regenerated by sweeping at room temperature with stream of pure nitrogen (N2) flowing at 60 ml/min for 4 hours. Heating up to 75°C was required to regenerate exhausted MEAimpregnated beds. Increasing feed gas flow rate has adverse effect on breakthrough time more than increasing bed operating temperature. Breakthrough time was utilized to evaluate the performance of the different adsorption beds.

Multifunctional polylactic acid composites filled with activated carbon particles obtained from acrylic fibrous wastes

The objective of this work was to explore the potentials of porous and electrically conductive activated carbon particles for possible enhancement of multifunctional properties of PLA. The activated carbon was inexpensively prepared from acrylic fibrous wastes by novel single stage carbonization and physical activation. The influence of 800°C, 1,000°C, and 1,200°C carbonization temperature on physical, morphological, and electrical properties was studied from EDX, X‐ray diffraction, SEM, and BET analysis. Later, the carbonized acrylic fibrous waste was pulverized in dry conditions by high energy planetary ball milling to get activated carbon particles. The particles were then incorporated into PLA under 1, 5 and 10 wt% loading to prepare composite films by solvent casting, and their electrical conductivity, EMI shielding, thermo‐mechanical, and thermal stability properties were investigated. POLYM. COMPOS., 40:578–590, 2019. © 2017 Society of Plastics Engineers

Investigating the influences of electrode material property on degradation behavior of organic wastewaters by iron-carbon micro-electrolysis

The degradation of Sunset Yellow (SY) wastewater was carried out using Fe-C micro-electrolysis process under the optimal conditions: initial pH 6, Fe/C ratio 1:1, Fe/C total mass 500 g·L−1 and the air flow rate 45 L·h−1. Effects of particle size, particle shape and material species of activated carbon (AC) on degradation and chemical oxygen demand (COD) removal efficiencies of SY by the Fe-C micro-electrolysis process were studied. The degradation and COD removal efficiencies of 500 mg·L−1 SY were approximately 99.0% and 77.5% after 90 min treatment with 3–6 mm spherical coal-based AC particles. Additionally, the degradation and COD removal efficiencies of SY maintained over 99.0% and 65.0% after 90 min treatment with any other types of AC. The stability of the Fe-C micro-electrolysis process was preferably and the AC surfaces before used and after used for 20 times were characterized by SEM, XPS, and XRD. In addition, the decomposition and degradation process was determined by UV–Vis analysis of the treated SY wastewaters. In conclusion, the particle size, particle shape and material species of AC indeed have influences on the degradation and COD removal efficiencies of SY by the Fe-C micro-electrolysis process and 3–6 mm coal-based spherical AC was selected as the optimal electrode material. Moreover, the antibiotic and printing wastewaters were selected to investigate the feasibility of degradation of other refractory organic wastewaters by Fe-C micro-electrolysis process.

Removal of Diclofenac from Water using an Hybrid Process Combining Activated Carbon Adsorption and Ultrafiltration or Microfiltration

Small amounts of pharmaceuticals are increasingly found in natural waters and wastewaters in treatment plants. Several processes are developed for their removal such as hybrid membrane processes. These techniques integrate membrane filtration (mainly ultrafiltration or microfiltration) to a physical technique (such as flocculation or sorption on activated carbon). In this study, we report results on a process with sorption on activated carbon and microfiltration or ultrafiltration using a ceramic membrane, with a specific attention to the influence of the membrane pore size. The membranes showed little fouling at the experimental conditions used (maximum 500 mg/L activated carbon), while an important increase in conductivity was observed in permeate samples due to the salting out of ions from the activated carbon particles. Besides, the removal of diclofenac and humic acid (both at 10 mg/L) was higher than 90 % during the treatment with both ultrafiltration and microfiltration, however microfiltration was preferred due to its higher flux. These results suggest that hybrid processes of activated carbon/ultrafiltration or microfiltration could be interesting alternatives for processing waters containing small amounts of pharmaceuticals.

Surface modification by graphene oxide: An efficient strategy to improve the performance of activated carbon based supercapacitors

We demonstrate an efficient and cost-effective strategy to improve electrochemical properties of AC based electrode materials. A series of graphene oxide (GO)-modified activated carbon (AC) composites (GO@ACs) have been prepared as electrode materials for supercapacitors (SCs). In GO@ACs, AC particles anchored on the surface of GO sheets which were synchronously reduced during charge/discharge process, and formed a 3D-conductive network. Electrochemical analyses revealed that 2.5wt% GO@AC, which exhibited improved electrical conductivity and high specific capacitance at large current density in organic electrolyte, is a promising electrode material for high-performance SCs. At 6A/g, the specific capacitance of 2.5wt% GO@AC increased by 249.5% in comparison with that of AC.

Assimilation efficiency of sediment-bound PCBs ingested by fish impacted by strong sorption.

Uptake of polychlorinated biphenyls (PCBs) by fish is controlled by the bioavailability of ingested PCBs in the gut and the freely dissolved concentration in the water moving across the gills. The prediction of bioaccumulation in fish relies on models that account for these exposure routes; however, these models typically do not account for incidental ingestion of sediment by fish, which is not well studied. The literature values for the PCB assimilation efficiency in the gut have been reported for compounds in food matrices and not associated with sediment particles. It is also unclear how mitigation strategies that alter PCB bioavailability in sediments affect predictions made by the bioaccumulation models when sediment ingestion is involved. To test the bioavailability of PCBs from treated and untreated sediments, dietary assimilation efficiencies were measured for 16 PCB congeners in mummichogs (Fundulus heteroclitus) that were fed 4 experimental diets. Diets consisted of PCB-spiked earthworms, spiked untreated sediment mixed with earthworms, spiked activated carbon-treated sediment mixed with earthworms, and spiked activated carbon mixed with earthworms. Assimilation efficiencies were determined by calculating the ratio of PCB mass in the fish tissue to the PCB mass in the food after a pulse feeding experiment. Assimilation efficiencies of PCBs associated with earthworm diet were similar to the values reported in the literature. Fish that were fed the PCB-spiked untreated sediment and activated carbon particles exhibited the highest and lowest assimilation efficiencies, respectively, over a wide KOW range. Assimilation efficiencies of sediment-bound PCBs were significantly reduced (31-93% reduction for different congeners) after amendment with activated carbon. The present study indicates that assimilation of PCBs can be reduced by sorption to black carbon. Environ Toxicol Chem 2017;36:3480-3488. © 2017 SETAC.

Combustion characteristics of activated carbon particles

In the present study, combustion of activated carbon particles was conducted using a thermogravimetric (TG) analyzer and a small-scale fluidized bed test bench. The combustion characteristics of activated carbon particles have been analyzed under different process conditions. The three-dimensional diffusion geometry anti-Jander model has been used to describe the combustion of activated carbon. By using the isothermal differential characteristics, activation energy values under different conversion rates have been obtained, which were then compared with the activation energy values obtained from the TG analyzer. The results showed that the two kinds of activation energy values were similar under low conversion rates. On the basis of TG combustion data, the AKTS software was employed to forecast the mass loss curve of activated carbon combustion under the condition of constant temperature. The curve was compared with the mass loss curve obtained from the fluidized bed. Finally, a comparison was drawn between the fluidized bed combustion and TG combustion for similarities and differences.

Nitrate reduction using hybrid system consisting of zero valent magnesium powder/activated carbon (Mg0/AC) from water

Abstract In this study, the hybrid system of zero-valent magnesium powder and activated carbon has been introduced to reduce nitrate from water in the laboratory scale under ambient temperature and open conditions. The effect of pH, dosage of zero-valent magnesium powder and the mass ratio of magnesium to activated carbon during reaction time have been studied as operational parameters. The ratio of the remained nitrate concentration to its initial concentration has been considered as the response of the removal process. The assessments for determining the effect of pH value on the nitrate removal process have carried out in two different conditions, with keeping pH value constant during the process and adjusting the initial pH on a specific value without trying to keep it constant. Also, in order to approach a better understanding of the system’s performance, the changes of the oxidation–reduction potential (OCP) and dissolved oxygen (DO) have been evaluated. According to the tests results, for the conditions that the pH values have not been kept constant, despite the significant removal of nitrate in the early times of the reaction, the pH value of the process increased to more than 11, shortly after the start of the reaction and the nitrate reduction reactions were stopped. While, for the conditions that the pH values have been kept constant, in addition to high nitrate ions removal efficiency in the first few minutes of reaction, the reduction process continued until the end of the reaction. Also, entire removal of nitrate ions has been achieved in the pH values equal to 3, the initial N O 3 − − N concentration of 90 mg/l, Mg0 dose equal to 0.65 g/l and the mass ratio of Mg0 to activated carbon powder 4:1 in less than 20 min. According to the results, the hybrid systems demonstrated better performance in lower pH values. The system nitrate removal ability modified by increasing the Mg0 dose as well as the activated carbon particles in the hybrid system. The outputs of the OPR and DO concentrations evaluations confirmed the results of the experiments and observations. Comparing the results of this study with the literature showed that the nitrate removal efficiency of the Mg0/activated carbon hybrid system is noticeably better than Mg0 system as well as Fe0/activated carbon hybrid systems, in the similar operational conditions.

The radiation property of activated carbon particles in the visible to infrared spectrum

The study of radiation property of particles is of great significance in the field of solar thermo-chemistry. In this study the randomly dispersed particle system is obtained by the KBr tablet method, and the transmittance of activated carbon particle systems in 0.4–25μm wavelength are measured by the spectrophotometer and FTIR to obtain their radiation property. The extinction coefficient of the particle systems and the efficiency factor for extinction of single particle are calculated through experimental data. The results show that the activated carbon particles have higher absorption ability in the visible light spectrum. Above investigation will not only be beneficial to the simulation of solar thermo-chemistry hydrogen production process, but also provide an experimental basis for inverse calculation of optical constants of the activated carbon particles.