Preparation Of Adsorbents Research Articles

A green 3-step combined modification for the preparation of biomass sorbent from waste chestnut thorns shell to efficient removal of methylene blue

Although several green methods for the preparation of biomass adsorbents have been proposed, the low adsorption performance of the biomass adsorbents prepared by these methods has limited the development of this technological route. This is the first work that uses an ultrasound-assisted binary solvent system and low temperature ice crystal fixation to achieve high adsorption performance of a biomass sorbent. Chestnut thorns shell (CTS) sorbent with high adsorption performance on MB was successfully prepared with an adsorption performance of 305.81 mg/g, which is on par with most high temperature carbonized adsorbents. Further reaction kinetics, TEM, XPS and FTIR studies showed that the MB adsorption of CTS was through electrostatic attraction, hydrogen bonding, ion–dipole interaction and π-π interaction. After five cycles, the adsorption capacity of the adsorbent remained at a high level. This work provided an effective strategy for safer and greener preparation of high adsorption performance adsorbents from agroforestry waste.

Preparation of efficient adsorbent with dual adsorption function based on semi-coke: Adsorption properties and mechanisms

Solid waste oil shale semi-coke (SC) is considered as a potential material for the preparation of adsorbents due to its rich organic and inorganic components. However, the dense structure and the complex form of the components present make it unsatisfactory for adsorption. In this study, using Alkali corrosion under hydrothermal condition, SC was prepared as an adsorbent material PSSC with excellent adsorption performance for both anionic and cationic dyes. The related characterization analysis showed that most of the organic matter and silicates of SC reacted with inorganic matter to form silicon carbide. The specific surface area of PSSC increased significantly (from 7.47 m2/g to 1353.99 m2/g) leading to the maximum adsorption of PSSC on Methylene blue (MB) and Congo red (CR) reached at 974.66 mg/g and 562.41 mg/g, respectively, which far exceeded the adsorption of SC on both dyes. Finally, the adsorption mechanisms were revealed from the structural and energetic perspectives. The results showed that the modification process increased the type and number of adsorption sites, and that these adsorption sites exhibited different capturing abilities for the two dyes with the change of contact temperature.

Porous Adsorption Materials for Carbon Dioxide Capture in Industrial Flue Gas.

Due to the intensification of the greenhouse effect and the emphasis on the utilization of CO2 resources, the enrichment and separation of CO2 have become a current research focus in the environment and energy. Compared with other technologies, pressure swing adsorption has the advantages of low cost and high efficiency and has been widely used. The design and preparation of high-efficiency adsorbents is the core of the pressure swing adsorption technology. Therefore, high-performance porous CO2 adsorption materials have attracted increasing attention. Porous adsorption materials with high specific surface area, high CO2 adsorption capacity, low regeneration energy, good cycle performance, and moisture resistance have been focused on. This article summarizes the optimization of CO2 adsorption by porous adsorption materials and then applies them to the field of CO2 adsorption. The internal laws between the pore structure, surface chemistry, and CO2 adsorption performance of porous adsorbent materials are discussed. Further development requirements and research focus on porous adsorbent materials for CO2 treatment in industrial waste gas are prospected. The structural design of porous carbon adsorption materials is still the current research focus. With the requirements of applications and environmental conditions, the integrity, mechanical strength and water resistance of high-performance materials need to be met.

Application of hybrid artificial neural network (ANN)–particle swarm optimization (PSO) for modelling and optimization of the adsorptive removal of cyanide and phenol from wastewater using agro-waste-derived adsorbent

In the present study, the waste part of the banana tree was used as a precursor, and copper chloride salt was used as an impregnating agent for the preparation of adsorbent to remove both cyanide and phenol from synthetic wastewater. Initially, thermogravimetric analysis was used to determine the rate of carbonization of the material with temperature, and thus, the optimum temperature (370 °C) and time of carbonization (35 min) were assessed. Different samples of adsorbents were prepared next by varying the weight ratio of pseudo-stem of waste banana tree to copper salt from 1:1 to 30:1. All the samples were then tested for removal of both the pollutants, and the ratio (20:1) corresponding to maximum removal of both the pollutants was considered as optimum. Therefore, further studies were conducted with the adsorbent prepared at optimum ratio, temperature and time and such adsorbent was termed as copper impregnated activated banana tree (CIABT). One variable at a time approach was followed to find out the most effective condition based on the maximum removal of pollutants. Maximum removal of 95.99 ± 1.03% and 97.33 ± 0.04% was achieved for cyanide (initial concentration: 100 ppm) and phenol (initial concentration: 450 ppm), respectively, at an optimum contact time of 150 min, the particle size of 90 μ, the adsorbent dosage of 10 g/L, pH 8.0 using CIABT at 25 °C. Hybrid artificial neural network–particle swarm optimization were employed for modelling-optimization of removal of both the pollutants while achieving 91.4–99.99% and 86.43–99.99% removal of cyanide and phenol, respectively, from simulated wastewater.

Specific alkali metal sites as CO2 traps in activated carbon with different pore size for CO2 selective adsorption: GCMC and DFT simulations

Activated carbon is a kind of promising adsorbent for post-combustion CO2 adsorption and separation. However, due to the physical adsorption properties, the use of the reported activated carbon for CO2 adsorption capacity and CO2/N2 selectivity presents a huge challenge without deep cooling of flue gas to room temperature or even lower temperature and low CO2 partial pressure. To solve the above problem, the CO2 uptake in practical flue gas on M−doped (M = O, N, S and alkali metal) graphite surfaces (GS) with various pore widths (0.35–3 nm) were studied by density functional theory (DFT) and grand canonical Monte Carlo simulation (GCMC). The results show that the doping of oxygen, nitrogen, sulfur groups into graphite surface have no significant increase in CO2 uptake and CO2/N2 selectivity, while the doping of alkali metal into graphite surface can significantly improve the CO2 uptake and CO2/N2 selectivity in pores of less than 0.6 nm. Especially GS-Na shows the highest CO2 uptake and CO2/N2 selectivity, up to 20.7 mmol mL−1 (0.35 nm) and 1040 (0.4 nm), respectively. The above findings emphasize the importance of the combination of pore widths less than 0.6 nm and alkali metal groups in determining the CO2 uptake. By studying the influence of pore size and functional groups on CO2 adsorption, the internal enhancement mechanisms, including CO2 pore-filling adsorption and electrostatic interaction, are clarified. Meantime, the mechanism of functional groups and pore widths synergistically increasing the CO2 uptake was revealed. These results would provide theoretical guidance for the design and preparation of carbon-based adsorbents for CO2 uptake.

Preparation of monolith-based adsorbent containing abundant functional groups for field entrapment of nitrogen and sulfur containing aromatic compounds in environmental aqueous samples with portable multichannel in-tip microextraction device

Field sample preparation is important and interesting for analysis of nitrogen and sulfur containing aromatic compounds (N,S-CACs) in environmental aqueous samples. In this connection, a new functional groups-rich adsorbent based on porous monolith (ABM) was fabricated by in-situ copolymerization of allylaminocarbonylphenyl boronic acid/styrene and ethylene glycol dimethacrylate. The prepared ABM was employed as the extraction medium of homemade portable multichannel in-tip microextraction device (PMMD) for on-site entrapment of N,S-CACs in various waters. Because of the abundant functional groups, the obtained ABM/PMMD exhibited satisfactory capture capability towards studied N,S-CACs, and the enrichment factors varied from 454 to 491. Under the optimized fabrication conditions, adsorption and desorption parameters, the developed ABM/PMMD was used to field capture investigated N,S-CACs and followed by quantification with high performance liquid chromatography. The limits of detection were in the ranges of 0.00030–0.0016 µg/L. Recoveries with low, medium and high spiked contents located in the range of 82.1–118% with good repeatability (RSDs<9%). In addition, traditional laboratory sample pretreatment approach was employed to verify the reliability of the established method. Results well evidenced that the practicability of introduced ABM/PMMD in the field sample preparation of N,S-CACs in environmental waters.

Nanoporous biochar with high specific surface area based on rice straw digestion residue for efficient adsorption of mercury ion from water

The unreasonable disposal of residue after anaerobic digestion seriously affects the stability of the ecosystem, and the preparation of adsorbent is an effective way to value-added utilization of the residue. In this study, a high adsorption capacity (209.65 mg/g) biochar-based adsorbent was prepared by hydrothermal carbonization and alkali modification using rice straw biogas residue. The lignocellulosic structure was destroyed after anaerobic digestion, forming porous biochar with larger specific surface area (2372.51 m2/g) and richer pore structure. Besides, the mercury ion complexed on the adsorbent surface in monovalent and divalent forms and possessed favorable selectivity in the presence of other examples of interference. The adsorption process is consistent with pseudo second-order kinetics and the Langmuir isotherm, indicating a predominance of chemisorption. This study provides a methodology for use of rice straw biogas residue and treatment of mercury containing wastewater, which offers a fresh direction for resource utilization of biogas residue.

A novel utilization of raw sepiolite: preparation of magnetic adsorbent directly based on sol-gel for adsorption of Pb(II).

The constraints of industrial separation technology for low grade sepiolite greatly limit the development and utilization of these potential resources. In this work, a novel sepiolite adsorbent loaded with copper ferrite was prepared by sol-gel method to remove Pb(II) from wastewater. The effects of various factors on Pb(II) removal ratio were investigated. The maximum adsorption capacities at 293, 313, and 333K were 1285.32, 1325.45, and 1390.54mg/g, respectively. The adsorption of Pb(II) by magnetic sepiolite was a spontaneous endothermic process. Besides, the adsorption process followed Langmuir isothermal adsorption model and pseudo-second-order kinetic model. The main adsorption mechanism of Pb(II) removal was electrostatic attraction, ion exchange, and surface complexation. The improvement of Pb(II) absorption indicated that the efficient removal of Pb(II) can be realized by phosphate groups introduced in the preparation process and the carbonate groups contained in gangue minerals.

Preparation of adsorbents from agro-industrial wastes and their application in the removal of Cd2+ and Pb2+ ions from a binary mixture: Evaluation of ionic competition

Adsorbents were prepared from agro-industrial wastes for the removal of Cd2+ and Pb2+ ions from a binary mixture. Of all the adsorbents prepared, that activated with H3PO4 obtained from peanut shell (AQps) had the highest adsorptive capacity as regards the removal of both metal ions. The operating conditions established were: pH 5.0; 2 gadsorbent Lsolution‐1 and 50 rpm. The kinetic showed rapid adsorption, and the equilibrium was reached in 3 min. Both pseudo-first-order and pseudo-second-order models represented the experimental data with R2 values > 0.91 and χ2< 0.0001 for all the concentrations studied. The extended Langmuir model fitted the experimental data, obtaining R2 = 0.90, with qmax of 0.7 ± 0.3 mmol g‐1 and KEL of 5.0 ± 3.6 L mmol‐1 for Cd2+ and qmax of 0.7 ± 0.1 mmol g‐1 and KEL 40.5 ± 14.9 L mmol‐1 for Pb2+. A decreasing trend in adsorptive capacity was also observed when the temperature was increased, indicating exothermic adsorption. During the evaluation of adsorbent recovery, when the volume of the eluent was five times smaller than that of the adsorbate, maximum desorption of 84.5 % for Cd2+ and 73.3 % for Pb2+ was obtained. In view of the above, AQps showed potential for simultaneous removal of Cd2+ and Pb2+ ions from aqueous media.

Preparation of a novel silica-based N-donor ligand functional adsorbent for efficient separation of palladium from high level liquid waste

In this work, a novel silica-based N-donor ligand functional adsorbent (SiVpC) is prepared by in situ polymerization for the efficient separation of palladium from high level liquid waste (HLLW). The as-prepared SiVpC adsorbent is characterized by SEM-EDS, TGA, and BET. The effects of nitric acidity, SiVpC adsorbent dosage, time, temperature, and palladium ion concentration on the adsorption are investigated. Among the 12 typical fission product metal ions (Ru, Rh, La, Y, Pr, Ce, Sm, Nd, Gd, Eu, Zr, Mo) existing in HLLW, SiVpC adsorbent can selectively adsorb palladium (SFPd/other metals = 137.6) in 0.5 M HNO3 solution. The adsorptio kinetics of Pd(II) are consistent with the pseudo-second-order model, reaching equilibrium within 120 min. The maximum adsorption capacity is 38.4 mg/g in 0.5 M HNO3, and the adsorption process is consistent with the Langmuir model. The adsorbed palladium can be completely desorbed with 0.5 M HNO3-0.5 M Thiourea. Furthermore, SiVpC adsorbent remains good performance after five adsorption–desorption cycles, which indicates good reusability. The adsorption mechanism of SiVpC adsorbent on palladium is analyzed by FT-IR and XPS that N-containing functional groups on the ligand are coordinated with palladium, which is also further verified by DFT calculations. In addition, through the column chromatography separation system, SiVpC adsorbent can efficiently adsorb palladium from HLLW and the adsorbed palladium can be desorbed with 0.5 M HNO3-0.5 M thiourea solution, which has great application potential.

Conversion of waste bottle PET to magnetic microparticles adsorbent for dye-simulated wastewater treatment

Mass production and consequent accumulation of plastic wastes in the environment urges the development of technologies for the efficient plastic wastes utilization and valorization to materials and products to support circular economy. Here, we report a novel conversion of PET plastic to a magnetic microparticles adsorbent prepared by co-precipitation of Fe3O4 nanoparticles with oligomeric products of PET aminolysis. The obtained adsorbent represents highly water-dispersible oligo(terephthalamide) particles of several tens μm size embedding magnetic nanoparticles randomly distributed in the organic matrix. The PET-derived magnetic adsorbent was used for the rapid and facile magnetic separation of an anionic dye (Congo Red, CR) from dye simulated water samples. The adsorbent containing plenty of amine groups showed superb adsorption capacity for CR of ca. 780 mg/g which is pH dependent and optimal at pH 6.5. Furthermore, the microparticular, non-aggregative state of the adsorbent coupled with its magnetic functionality provided rapid saturation of the adsorbent with dye by ca. 70% of the equilibrium adsorption capacity within 5 min and possibility of instantaneous removal from solution by a magnet. The proposed here material design addresses simultaneously the problem of plastic wastes utilization and preparation of cost-effective and efficient adsorbents for environmental cleaning purposes.

Metal oxide rich char from muffle furnace and retort heated reactor treated cow bone

The high energy cost of thermochemical processing of biomass wastes into valuable products has necessitated the usage of alternative biofuel powered reactor like top lit updraft (TLUD) retort heated reactor. The suitability of TLUD retort heated, self regulating reactor as alternative to the conventional muffle furnace was explored in cow bone carbonization in this study. High-temperature treatments of cow bone (TCB) were carried out in conventional muffle furnace option (TCB 1) and TLUD retort heated reactor (TCB 2). For comparison, cow bone was treated at higher temperature (500 o C) for 120 min using a conventional method, designated TCB 1, while the same was treated in a self regulating retort heated reactor powered by combusting biomass with peaked temperature of 462.7 o C and the combustion time of 90 min. The properties of the samples TCB 1 and TCB 2 were studied using SEM, XRD, BET, BJH, XRF-EDS, and DFT. In the final analysis, results of TCB 1 and TCB 2 were found competitively comparable in their physiochemical properties and the presence of additional minerals and elements. The present study reveals an economical and effective material recovery route for the preparation of adsorbents and precursors of compounds and elements. • Metallic oxide rich char was produced via compared thermal treatments from cowbone waste. ii. Muffle Furnace and retort heated reactor at differential conditions were used. iii. Physicochemical properties were elucidated and low cost retort treated means were found better.

Preparation, Modification and Characterization of Chitosan-Oxalic Kola Nut Pod Adsorbent

Abstract: This work investigated the preparation, modification and characterization of prepared adsorbent from kola nut pod (agro waste).The kola nut pod waste was obtained from Ipetu-Ijesha farm, modified using chitosan-oxalic gel and characterized using Scanning Electron micrograph -Energy dispersive X-ray and FTIR spectrophotometer. The morphological study revealed that the chemically modified adsorbent has high porosity and large surface area for effective adsorption of metal ions in aqueous solution, The EDX analysis revealed that the chitosan-oxalic modified kola nut pod adsorbent contains C (0.01%), N (14.46%), K (7.76%), O (14.48%), Si (0.09%) and Ca (62.24%). The FTIR spectrum shows some adsorption peaks that indicate the functional groups on the adsorbent This further suggested that the adsorbent has potential adsorption sites as represented by the functional groups OH, C-H, C-C, and COOH. The results of Physico chemical properties showed that moisture; 8.32±0.07, Ash; 6.31±0.04, lignin; 12.97±0.03, cellulose; 23.53±0.04, Hemicellulose; 16.76±0.02, pectin; 7.74±0.03 and extractives 24.37±0.04. This results showed that this kola nut pod contains considerable amount of lignin, cellulose and hemicelluloses thus, will form a very good adsorbent for removal of dyes and heavy metals in wastewaters. Keyword: modification, characterization, chitosan-oxalic, kola nut pod waste, Physico chemical properties, morphological study.

Preparation and characterization of green adsorbent on functionalized and nonfunctionalized ALOE VERA: A combined experimental and DFT calculations

An influential subject of research is the preparation of raw Aloe-Vera (AV) which is characterized by FTIR, XRD, SEM, and BET and its use as a biosorbent for the effective removal of Pb(II) and Cd(II) ions from an aqueous solution. The adsorption study was studied using UV–visible (UV/Vis) spectroscopy. The adsorption capacity of Pb(II) by AV is 36.33 mg/g (95,79%) was obtained at 20 min at acidic pH = 3, whereas the optimal sorption of Cd(II) is 16.92 mg/g (81.54%) at 15 min at pH = 6 with a mass of adsorbent of 0.05 g and metal ion concentration of 5.10–4 M at 20 °C. Thermodynamic studies have proven that the removal of Pb (II) and Cd (II) using AV is spontaneous, endothermic, and physical in nature. The adsorption kinetics follows the pseudo-second-order process and the isotherm adsorption was most accurately described by the Freundlich model. On the other hand, based on the enormous power of the density functional theory as a tool in the adsorption phenomena, which has been greatly improved by their applications to organic and inorganic adsorption design. The functionalB97D3 with 6-311++G**/land2dz//SMD basis set and solvent model is used using descriptors as molecular, electronic, and reactivity indices.

Adsorbents Used for the Adsorptive Removal of Highly Hazardous Arsenic from Aqueous Solution: A Review

Millions of people worldwide are adversely affected by Arsenic continuing exposure, so providing arsenic-free consumption of water is an immense task for the researchers. The chemistry, content of arsenic-contaminated water as well as adsorption play a big role in arsenic elimination. The mechanism of adsorption technology's elimination of As (V) from the water was simply presented as the elements that govern various adsorption paths. The effects of a variety of adsorbents on As (V) elimination from aquatic were explored in the present research, which classified the materials used as adsorbents based on physical, chemical, and biological processes. When choosing an adsorbent, adsorption capability is an important factor to consider. As a result, developing As (V) elimination from aquatic adsorption strategies includes developing environmentally acceptable materials with effectual adsorption abilities, refining the preparation and alteration procedures of recent adsorbents, and boosting renewal effectiveness. After choosing a particular adsorbent for As (V) elimination from water, regional features of arsenic-polluted water, applied viability of the adsorption process, besides suitable environments of respectively material must be extensively reviewed and analyzed. The current study gives an outline of the adsorption technique to remove arsenic from wastewater, as well as the adsorption capacity of various adsorbents.

Preparation of polyhydroxyl adsorbent and its application in the removal of Ginkgolic acids

Extracts of Ginkgo biloba (EGb) have many biological activities, but contain a small amount of toxic ginkgolic acids, limiting the use of EGb. Based on the structural characteristics of ortho-hydroxy-carboxyl group on ginkgolic acids, we introduced hydrophilic polyhydroxy structure into hydrophobic polydivinylbenzene (PDVB) frameworks by reinitiation of suspended double bonds. A kind of adsorbent (DVA adsorbent) with hydrophobic - hydrophilic framework, uniform functional group distribution, high specific surface area and high crosslinking structure was synthesized. DVA adsorbent can selectively remove ginkgolic acids based on synergistic effect of multiple weak interactions with ginkgolic acids. DVA-20, which had the highest adsorption capacity and the best adsorption selectivity. After 30 bed volume (BV) adsorption solution was treated with DVA-20, the concentration of ginkgolic acids in the effluent decreased from 1781 ppm to 1.5 ppm, and the recovery of ginkgo flavonoids and lactones was nearly 100%. Moreover, DVA-20 has good repeatability. The EGb production process based on DVA-20 was established. The new process is continuous and can obtain both ginkgolic acids and EGb while meeting international standards, and has a very broad application prospect.

Adsorption of dental clinic pollutants using bone char: Adsorbent preparation, assessment and mechanism analysis

The assessment of bone char for the adsorption of toxic dental clinic pollutants is reported. Different conditions for bone char preparation via pyrolysis and its adsorption properties were evaluated using fluoride, mercury and arsenic as the target pollutants. The best pyrolysis conditions to improve the adsorption properties of this adsorbent for the removal of these dental clinical pollutants were identified. The best bone char was employed to quantify the experimental isotherms of the adsorption of mercury, fluoride and arsenic at pH 6 and 20 – 40 °C. Results showed that the dehydroxylation of hydroxyapatite contained in the bone char affected its adsorption properties for the removal of these pollutants and not only its defluoridation properties as has been already reported in the literature. It was concluded that the degree of hydroxyapatite dehydroxylation affected the ligand exchange involved in the adsorption mechanism of bone char for the removal of these adsorbates. Theoretical calculations with statistical physics and artificial neural networks indicated that fluoride and mercury adsorption on bone char was an endothermic multi-molecular process, while the arsenic adsorption was also endothermic but implying mono-adsorbate interactions. Bone char showed the best maximum adsorption capacities for fluoride (0.4 – 1.58 mmol/g) followed by mercury (0.14–0.23 mmol/g) and arsenic (0.06 – 0.14 mmol/g), respectively. Calculated adsorption enthalpies for these pollutants ranged from 25.4 to 39.4 kJ/mol. A detailed description of the adsorption mechanism and possible interactions involved in the removal of these dental clinic pollutants with bone char were also provided. This study contributes with theoretical and experimental results to support the development of an in situ solution for facing the water pollution problem caused by the dental clinics, which is an unregulated health care sector in terms of local and international legislations for water quality protection.

Preparation of efficient and economical adsorbent for Cu2+ and Pb2+ adsorption via modifying the silicon–oxygen structure of leaching residues

One eco-friendly and cheap cost leaching residue (LR) was obtained from serpentine leaching system and used to adsorb Cu2+ and Pb2+ in wastewater. LR had a large specific surface area, and uneven interface with irregular holes provided more adsorption sites. Moreover, silicon–oxygen structure of LR presented as one bridge oxygen (Q1), which was more electronegativity and act as the adsorption active site for metal actions. All these characteristics indicated that LR had good adsorption performance, whose equilibrium adsorption capacity (Qe) for Cu2+ and Pb2+ could reach to 38.85 and 27.97 mg/g, respectively. Moreover, the Qe of Pb2+ was much lower than that of Cu2+ in single or binary systems. Selective adsorption mechanism was studied by DFT calculations, the adsorption energy (Eads) of Si–O–Cu and Si–O–Pb equaled to −2.4834 and −2.1822 Ha, indicating that the interaction of Cu2+ ions with LR was stronger and more stable than Pb2+ ions. In this work, leaching residue was transformed into an efficient and cheap absorbent via modifying the silicon–oxygen structure of clay minerals.

Preparation of adsorbent from nickel slag for removal of phosphorus from glyphosate by-product salt

ABSTRACT In this paper, nickel slag was used as raw material to hydrothermally synthesize zeolite and modified to prepare a phosphorus adsorbent. The adsorbent was characterized by XRD, FT-IR, SEM, and EDS. The effects of adsorbent dosing, contact time, dosing volume, and initial concentration of solution on the adsorption effect were investigated. The results showed that the adsorbent had good adsorption performance at the optimum dosage of 8 g/L and at the solution pH at 3–11. The adsorption kinetics were in accordance with the pseudo-first-order kinetic model, and the adsorption equilibrium was reached at a contact time of 30 min, and the maximum adsorption capacity was predicted by Langmuir to be 16.61 mg/g. Therefore, the study not only effectively used industrial solid waste nickel slag to prepare adsorbents, but also effectively removed phosphorus in real water.

A novel method for fabrication of a binary oxide biochar composite for oxidative adsorption of arsenite: Characterization, adsorption mechanism and mass transfer modeling

Arsenite [As(III)] is more mobile and toxic than arsenate [As(V)], making it more difficult and more critical to remove from water. The oxidative adsorption of As(III) is preferred due to its cost and time effectiveness. The chemical mixing process is a common method for preparation of biochar composites, but it is not time-efficient for homogeneous metal impregnation and is challenging to achieve consistent and reproducible physicochemical properties of the composite. The mixing method is even more challenging if two metal oxides are utilized in preparing engineered biochars. The current study proposes a novel microwave- and electrochemical-assisted technique to overcome the shortcomings of the mixing method and create a binary-oxide biochar composite with oxidation and adsorption capabilities. In addition, a new procedure was used to develop a diffusional mass transfer model combined with a genetic algorithm to characterize the adsorption process. Characterization of the fabricated biochar indicated that the deposited Fe and Mn oxides on the biochar surface included a mixture of Mn(II,III,IV) oxides and poorly crystalline α-FeOOH, respectively. The adsorption results suggested a hybrid adsorption mechanism with a high probability of a homogeneous monolayer adsorption process. Based on XANES analyses, no reduction to As(III) was observed for the As(V) adsorbed onto adsorbent, while 79% of the adsorbed As(III) was oxidized to As(V). The intraparticle diffusion and external mass transfer coefficients were estimated using a diffusional mass transfer model. Based on the modeling results, the adsorption of As onto the fabricated adsorbent was mainly controlled by external mass transfer. Overall the As(III) adsorption capacity of untreated biomass increased from 62 to 21,426 μg/g through the modification, indicating the high potential of the proposed procedure for preparation of adsorbents with improved oxidation and adsorption performance.