Methylene Blue Adsorption Capacity Research Articles

Micromorphology control of the lignin-based activated carbon and the study on the pyrolysis and adsorption kinetics

The waste corncob-based lignin (AL) treated by alkali was applied as feedstock to prepared activated carbon (AC) for the methylene blue (MB) adsorption. To explore the pyrolysis mechanism of ALs, the pyrolysis kinetics were discussed by the methods of Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) equations at different heating rates, which are widely applied in the determination of dynamic parameters with reduction of the errors of multi-step dynamics. In the process of preparing lignin-based activated carbon (LC), the relationship between pyrolysis condition and structure of LCs was systematically investigated. The maximum specific surface area of LCs reached 1215.83 m2/g with high the mesoporous proportion (77.3%) at optimal activation conditions including activation temperature (550 °C), activation duration (120 min) and phosphoric acid concentration (50%). For the adsorption of methylene blue (MB) solution, the fitted kinetic model was in accordance with the pseudo-second-order kinetic model. The adsorption capacity of MB could achieve as high as 493.28 mg/g (± 5 mg/g), and the highest removal rate of MB could reach 99.0% (± 0.2%) during the secondary adsorption process. This work offers a prospective proposal to provide theoretical reference for producing LC based on pyrolysis of alkaline lignin, and utilize the LC as potential adsorbent in the dyeing wastewater treatment.

Functionalized polymethyl methacrylate-modified dialdehyde guar gum containing hydrazide groups for effective removal and enrichment of dyes, ion, and oil/water separation

In the study, a novel polymethacryloyl hydrazone modified guar gum adsorption material (GSA) was prepared via condensation between polyhydrazide and dialdehyde guar gum. GSA exhibited an abundant porous structure, higher selectivity for cationic pollutants in high-concentration wastewater like methylene blue (MB), malachite green (MG) dyes, and Cu2+. Under optimized experimental conditions, the maximum equilibrium adsorption capacity of MB, MG, and Cu2+ were 1418.36 mg/g, 1375.58 mg/g, and 196 mg/g, respectively. Adsorption isotherms and kinetics were well fitted with the Langmuir isotherm model and pseudo-second-order kinetic model. The thermodynamic analysis demonstrated that the adsorption process was endothermic, feasible, and spontaneous. Correspondently, the adsorption mechanism was explored by FTIR, SEM-EDS and XPS. The adsorbent was employed in disposing of local sewage water. Additionally, GSA successfully achieves efficient water/oil separation in different salt concentrations with a separation efficiency exceeding 99%.

Optimization of Biochar Production by Co-Torrefaction of Microalgae and Lignocellulosic Biomass Using Response Surface Methodology

Co-torrefaction of microalgae and lignocellulosic biomass was evaluated as a method to process microalgae sludge produced from various effluents and to obtain biochars with suitable properties for energy or material valorization. The influence of four independent variables on biochar yield and properties was evaluated by a set of experiments defined by response surface methodology (RSM). The biochars were characterized for proximate and ultimate composition, HHV, and methylene blue adsorption capacity. HHV of the biochars was positively correlated with carbonization temperature, residence time, and lignocellulosic biomass content in the feed. Co-torrefaction conditions that led to a higher yield of biochar (76.5%) with good calorific value (17.4 MJ Kg−1) were 250 °C, 60 min of residence time, 5% feed moisture, and 50% lignocellulosic biomass. The energy efficiency of the process was higher for lower temperatures (92.6%) but decreased abruptly with the increase of the moisture content of the feed mixture (16.9 to 57.3% for 70% moisture). Biochars produced using algal biomass grown in contaminated effluents presented high ash content and low calorific value. Dye removal efficiency by the produced biochars was tested, reaching 95% methylene blue adsorption capacity for the biochars produced with the least severe torrefaction conditions.

High-performance biochar derived from the residue of Chaga mushroom (Inonotus obliquus) for pollutants removal

A high-performance biochar derived from the residue of Chaga mushroom (Inonotus obliquus) was reported in this study. Inonotus obliquus residues were used to prepare biochar, and the optimal synthesis conditions were obtained by response surface methodology. The specific surface area, pore volume, and average pore size of the optimal biochar (Zn-IORBC) was 1676.78 m2/g, 1.87 cm3/g, and 3.88 nm, respectively. Methylene blue (MB) and tetracycline (TC) were selected to estimate the adsorption performance of Zn-IORBC. The adsorption process was suitable for the pseudo-second-order model and Langmuir model. Zn-IORBC could maintained a large amount of TC adsorption (the lowest value was 686.20 mg/g in mountain spring water) in different natural water. The maximum adsorption capacity of TC and MB was 947.42 and 1033.66 mg/g. The adsorption mechanism was contributed to the electrostatic attraction, hydrogen bonding, π-π interactions, and pore-filling. Zn-IORBC is an effective adsorbent for high-performance pollutants removal.

Synthesis of Coal Gangue-Based Mesoporous X Zeolite with Soft Template and Its Adsorption Methylene Blue

In this article, coal gangue-based mesoporous X zeolite was synthesized by soft template method (cetyltrimethylammonium bromide was added as mesoporous template). By the optimization of experimental conditions, We determined that n(SiO2)/n(Al2O3) = 11.0, crystallization time of 48 h and n(CTAB)/n(SiO2) = 0.03 were the best synthesis conditions. The gangue-based mesoporous X zeolite has a specific surface area of 604.7 m2/g and a pore volume of 0.110 cm3/g. Under the optimal synthesis conditions without adding templating agent, the pore volume of X zeolite increased by 3.3 times. The effect of coal gangue-based mesoporous X zeolite on the adsorption performance of methylene blue was studied. The results showed that the best adsorption conditions were 0.06 g zeolite dosage, 75 mg/g initial concentration, and 60 min shaking time. The results showed that the removal rate and adsorption capacity of methylene blue were 91.49% and 34.31 mg/g, respectively. The adsorption capacity of methylene blue on X zeolite without template agent was enhanced 1.7 times.

The Use of High Surface Area Mesoporous-Activated Carbon from Longan Seed Biomass for Increasing Capacity and Kinetics of Methylene Blue Adsorption from Aqueous Solution.

Microporous- and mesoporous-activated carbons were produced from longan seed biomass through physical activation with CO2 under the same activation conditions of time and temperature. The specially prepared mesoporous carbon showed the maximum porous properties with the specific surface area of 1773 m2/g and mesopore volume of 0.474 cm3/g which accounts for 44.1% of the total pore volume. These activated carbons were utilized as porous adsorbents for the removal of methylene blue (MB) from an aqueous solution and their effectiveness was evaluated for both the adsorption kinetics and capacity. The adsorption kinetic data of MB were analyzed by the pseudo-first-order model, the pseudo-second-order model, and the pore-diffusion model equations. It was found that the adsorption kinetic behavior for all carbons tested was best described by the pseudo-second-order model. The effective pore diffusivity (De) derived from the pore-diffusion model had the values of 4.657 × 10−7–6.014 × 10−7 cm2/s and 4.668 × 10−7–19.920 × 10−7 cm2/s for the microporous- and mesoporous-activated carbons, respectively. Three well-known adsorption models, namely the Langmuir, Freundlich and Redlich–Peterson equations were tested with the experimental MB adsorption isotherms, and the results showed that the Redlich–Peterson model provided the overall best fitting of the isotherm data. In addition, the maximum capacity for MB adsorption of 1000 mg/g was achieved with the mesoporous carbon having the largest surface area and pore volume. The initial pH of MB solution had virtually no effect on the adsorption capacity and removal efficiency of the methylene blue dye. Increasing temperature over the range from 35 to 55 °C increased the adsorption of methylene blue, presumably caused by the increase in the diffusion rate of methylene blue to the adsorption sites that could promote the interaction frequency between the adsorbent surface and the adsorbate molecules. Overall, the high surface area mesoporous carbon was superior to the microporous carbon in view of the adsorption kinetics and capacity, when both carbons were used for the removal of MB from an aqueous solution.

Preparation of sodium alginate/polyvinyl alcohol composite nanofiber membranes for adsorption of dyes

In this research, electrospinning was used to prepare sodium alginate (SA)/polyvinyl alcohol (PVA) composite nanofiber membranes. Effects of electrospinning parameters on the morphology and fiber diameter were investigated, and an orthogonal design was chosen to optimize the parameters. The optimized nanofiber membranes were applied as an adsorbent for the removal of methylene blue (MB), basic fuchsin (BF), and methyl orange (MO). Kinetic and isotherm of adsorption and effects of different experimental conditions such as pH, contact time, and initial dye concentration on adsorption capacity were investigated. It was found that the optimum parameters for the nanofiber membranes were SA/PVA blend ratios (3:7), electric field strength (20 kV), flow rate (0.05 mL/h), and distance (12.5 cm) between the syringe needle and collector, and the mean fiber diameter of the optimized membranes was 99.58 nm. The adsorption of nanofiber membranes was well described by the pseudo-second-order adsorption kinetic model and the Langmuir model, indicating that the adsorption mechanism was chemisorption by a monolayer. Based on the Langmuir model, the adsorption capacities for MB, BF, and MO were 9.25 mg/g, 9.02 mg/g, and 7.35 mg/g, respectively.

Screening of factors that influence the preparation of Dialium guineense pods active carbon for use in methylene blue adsorption: a full factorial experimental design

BackgroundThe use of active carbons derived from waste biomass as adsorbents in the remediation of wastewater remains a valuable and cost-effective technology when compared to the use of commercial active carbon for the same purpose. This research aims at using a 2-level full factorial design (FFD) to efficiently evaluate factors that influence the preparation of active carbon from the waste pods of the Dialium guineense seeds. The influence of three preparation factors (concentration of the activating agent, activation time, and type of activating agent) on the active carbon yield and its adsorption capacity for methylene blue were investigated. Based on the full factorial design, two regression models were developed to correlate the factors to the two responses. From an analysis of variance (ANOVA), the most significant factors influencing each response were identified. The active carbon preparation conditions were then optimized by maximizing both the active carbon yield and its adsorption capacity for Methylene Blue. The functional group and surface morphology of the active carbon prepared under the predicted optimum conditions was analyzed via Fourier Transform Infra-Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM) respectively.ResultsThe results of this study revealed that the concentration of the activating agent had the most significant effect on the yield of the active carbon produced as well as on its adsorption capacity for methylene blue. The optimum preparation process conditions were found to be: concentration of activating agent 5M, activation time 30 min and activating agent, NaOH which resulted in an active carbon yield of 21.25%, and an adsorption capacity of 9.33509 mg MB per gram of active carbon. SEM and FTIR showed evidence of successful activation.ConclusionThe preparation of Dialium guineense seed pods' active carbon is strongly influenced by concentration and type of activating agent used. Reliable statistical models based on the FFD proved to be useful in identifying factors that significantly influence the preparation of Dialium guineense seed pods' active carbon. The active carbon holds great potential for application in the elimination of hazardous synthetic dyes from wastewater and should be explored further.

Enhance pore structure of cyanobacteria-based porous carbon by polypropylene to improve adsorption capacity of methylene blue

Porous carbon obtained by co-pyrolysis of plastic and biomass has received a lot of attention due to its excellent adsorption properties, and the pore structure plays an essential role in adsorption performance, however, the pore structure is still not well understood. Herein, we synthesized cyanobacteria-based porous carbon derived from cyanobacteria and polypropylene plastic by one-step method. CPC-800–30% exhibited a high BET surface area (2140 m2/g), pore volume up to 1.44 cm3/g. PP not only improved the pore structure of porous carbon, but also enriched the types of functional groups, such as O–H, N–H, C=O, and –CH, due to dehydroxylation or amino group decreased, resulting in the hydrogen radicals increased, hence PP had positive effect for biomass during co-pyrolysis. Meanwhile, CPC-800–30% showed excellent methylene blue (MB) adsorption capacity (667 mg/g). This work provided a new strategy for enhancing porous carbon structure via using PP as additive.

Characteristics of activated carbon prepared from flax shive by NH4NO3 and NH4Cl activation

The thermogravimetric method was used to study one-stage pyrolysis of finely ground flax shive chemically activated by NH4NO3 (AN) and NH4Cl (NAC). Activated carbons (AC) were obtained and the chemical activation mechanism was determined. The morphology, surface area and pore size distribution of the AC samples were studied by the methods of scanning electron microscopy, low-temperature nitrogen adsorption, energy-dispersive X-ray spectroscopy and X-ray diffraction. The maximum methylene blue adsorption capacity of the obtained AC samples was determined. The optimal parameters of activated flax shive pyrolysis (temperature, time) required for obtaining AC with the maximum specific surface area and adsorption capacity were identified.

Tailoring biochar by PHP towards the oxygenated functional groups (OFGs)-rich surface to improve adsorption performance

In this work, a modification method of H3PO4 plus H2O2 (PHP) was introduced to targetedly form abundant oxygenated functional groups (OFGs) on biochar, and methylene blue (MB) was employed as a model pollutant for adsorption to reflect the modification performance. Results indicated that parent biochars, especially derived from lower temperatures, substantially underwent oxidative modification by PHP, and OFGs were targetedly produced. Correspondingly, approximately 21.5-fold MB adsorption capacity was achieved by PHP-modified biochar comparing with its parent biochar. To evaluate the compatibility of PHP-modification, coefficient of variation (CV) based on MB adsorption capacity by the biochar from various precursors was calculated, in which the CV of PHP-modified biochars was 0.0038 comparing to 0.64 of the corresponding parent biochars. These results suggested that the PHP method displayed the excellent feedstock compatibility on biochar modification. The maximum MB adsorption capacity was 454.1 mg/g when the H3PO4 and H2O2 fraction in PHP were 65.2% and 7.0%; the modification was further intensified by promoting temperature and duration. Besides, average 94.5% H3PO4 was recovered after 10-batch modification, implying 1.0 kg H3PO4 (85%) in PHP can maximally modify 2.37 kg biochar. Overall, this work offered a novel method to tailor biochar towards OFGs-rich surface for efficient adsorption.

High-porous activated carbon derived from Myristica fragrans shell using one-step KOH activation for methylene blue adsorption

This study aims to synthesise high-surface-area activated carbon (AC) from Myristica fragrans shell (MFS) waste via a one-step KOH activation process. Herein, the optimum conditions in AC production were achieved from the impregnation weight ratio of MFS to KOH 1:0.5 at 700 °C for 30 min of activation time, which resulted in 1462 m2/g and 0.873 cm3/g for the Brunauer-Emmet-Teller surface area and total pore volume, respectively. The optimised AC was used in the adsorption of methylene blue from synthetic solution in a continuous flow system. The maximum methylene blue adsorption capacity was high at 346.85 mg/g at 25 °C. The findings exhibited the feasibility of MFS waste to be employed as a promising and low-cost raw material for the production of high-surface-area AC for dye removal from water and augmentation of solid waste management.

Easy-handling carbon nanotubes decorated poly(arylene ether nitrile)@tannic acid/carboxylated chitosan nanofibrous composite absorbent for efficient removal of methylene blue and congo red

Fabrication of highly efficient adsorption and easy-handling absorbent is promising for removal of dyes from wastewater, but it was still a big challenge. In this study, a novel polymer nanofibrous composite absorbent was designed by the decoration of acidified MWCNTs on polydopamine-modified poly(arylene ether nitrile) nanofibrous membrane and following co-deposition of tannic acid/carboxylated chitosan. The structure and composition of as-prepared nanofibrous composite absorbent were confirmed by SEM, FTIR, XPS, and TGA. The congo red (CR) and methylene blue (MeB) were applied as probe dyes to evaluate the adsorption capacity of nanofibrous composite absorbent (With the average pore diameter of 19.21 nm) for cation and anion dyes. It was found that the adsorption capacity of MeB and CR at the optimum pH could reach 633 and 589 mg/g in 300 min, respectively. The adsorption process of MeB and CR followed the Langmuir adsorption model and pseudo-second-order model. Moreover, the nanofibrous composite absorbent exhibited easy-handling property and good regeneration ability, showing the potential application for the efficient adsorption of various dyes from wastewater. • A novel polymer nanofibrous composite absorbent was designed. • Decoration of acidified MWCNTs on PDA/PEN nanofibrous mat and codeposition of tannic acid/carboxylated chitosan was applied. • The maximum adsorption capacities for MeB and CR could reach 633 and 589 mg/g at the optimum pH values, respectively. • The nanofibrous composite absorbent exhibited good regeneration ability and easy-handling property.

Methylene blue adsorption from an aqueous solution by a magnetic graphene oxide/humic acid composite

A novel adsorbent called magnetic humic acid/graphene oxide composite (MHAGO) adsorbent was prepared for treating methylene blue (MB) from wastewater. The structure and morphology of MHAGO were characterized by FTIR, XRD, SEM and XPS. The response surface method was used to optimize the quality feeding ratio for the raw materials, and the best graphene oxide: humic acid: ferroferric oxide feeding ratio was determined to be 0.25:0.50:1.66. Batch adsorption experiments were performed with variation in the initial MB dye concentration, pH of the solution, adsorbent dosage and contact time. The results showed that the adsorption reaction occurred at 45 °C with 30 mg adsorbent to adsorb 5.0 mg/L MB in 100 mL solution, with a maximum MB adsorption capacity of approximately 59.00 mg/g for MHAGO. The adsorption kinetics and adsorption isotherms were found to be in accordance with the Elovich equation and Langmuir model, respectively. Moreover, the thermodynamic parameters showed that the adsorption is spontaneously endothermic. The mechanisms for MB adsorption onto the MHAGO surface was mainly electrostatic attraction, π-π interaction and hydrogen bonding. In addition, the MHAGO shows good feasibility for the removal of pollutants from real factory dyeing wastewater.

Preparation of activated carbon from pine sawdust with hydrothermal-pressure preconditioning

The aim of this paper has been to find a biomass pretreatment protocol for preparing activated carbons without using any of the commercially-applied chemical additives. Instead, we employed a hydrothermal-pressure preconditioning protocol (160 ℃, 300–390 psi) to induce rapid steam expansion within pine sawdust, followed by pyrolysis/activation. The pinewood sawdust was preconditioned via three alternative synthesis protocols: (a) High-Pressure Hydrothermal Eruption (HPE), (b) High-Pressure Hydrothermal (HP), and (c) non-pre-pressure Hydrothermal (HY) treatment. Activated carbons were characterized by BET, SEM, FTIR and XPS; and the results indicate that HP achieved the highest specific surface area (990 m2 g−1) and micropore volume (0.344 cm3 g−1). Adsorption tests with perfluorooctanoic acid (PFOA) and methylene blue (MB) show that the adsorption capacities of the prepared activated carbons were significantly better than a commercial activated carbon (CAC). The HP exhibited the highest adsorption capacity for PFOA (232 mg g−1) and MB (350 mg g−1). The PFOA adsorption rates were empirically described by pseudo-second-order and intra-particle diffusion models; and the equilibrium sorption of PFOA fit well to Langmuir isotherm model.

Sheet-like Skeleton Carbon Derived from Shaddock Peels with Hierarchically Porous Structures for Ultra-Fast Removal of Methylene Blue

To remove the pollutant methylene blue (MB) from water, a sheet-like skeleton carbon derived from shaddock peels (SPACs) was prepared by NaOH activation followed by a calcination procedure under nitrogen protection in this study. Characterization results demonstrated that the as-prepared SPACs displayed a hierarchically porous structure assembled with a thin sheet-like carbon layer, and the surface area of SPAC-8 (activated by 8 g NaOH) was up to 782.2 m2/g. The as-prepared carbon material presented an ultra-fast and efficient adsorption capacity towards MB due to its macro-mesoporous structure, high surface area, and abundant functional groups. SPAC-8 showed ultrafast and efficient removal capacity for MB dye. Adsorption equilibrium was reached within 1 min with a removal efficiency of 99.6% at an initial concentration of 100 mg/g under batch adsorption model conditions. The maximum adsorption capacity for MB was up to 432.5 mg/g. A pseudo-second-order kinetic model and a Langmuir isotherm model described the adsorption process well, which suggested that adsorption rate depended on chemisorption and the adsorption process was controlled by a monolayer adsorption, respectively. Furthermore, column adsorption experiments showed that 96.58% of MB was removed after passing through a SPAC-8 packed column with a flow rate of 20 mL/min, initial concentration of 50 mg/L, and adsorbent dosage of 5 mg. The as-prepared adsorbent displays potential value in practical applications for dye removal due to its ultrafast and efficient adsorption capacity.

Direct regeneration of hydrogels based on lemon peel and its isolated microcrystalline cellulose: Characterization and application for methylene blue adsorption

In this study, we developed a facile and eco-friendly fabrication of hydrogels based on lemon peel (LP) and its isolated microcrystalline cellulose (LPMCC) by direct co-dissolving in 1-butyl-3-methylimidazolium chloride (BmimCl), followed by direct regeneration in distilled water to form hydrogels. The influence of LP addition on the structure and methylene blue (MB) adsorption of the hydrogels was systematically investigated. The hydrogels displayed a physically cross-linked network through hydrogen bonding interactions. Compared with pure LPMCC hydrogel, the introduction of LP increased the porosity and improved the thermal stability of the hydrogels. The adsorption process of MB on the hydrogels conformed better to the pseudo-second-order kinetic (R2 > 0.993) and Langmuir isotherm models (R2 > 0.996). The MB adsorption process was feasible, spontaneous and exothermic in nature, and was influenced by initial MB concentration, pH, temperature, ionic type and strength. Notably, the introduction of LP improved MB adsorption capacity of the hydrogels. This work develops a facile approach of agricultural by-products based hydrogels using pure cellulose as the structural skeleton and untreated lignocellulose components as the structure modifier.

Fabrication of a novel biopolymer‐based nanocomposite (nanoTiO2‐chitosan‐plum kernel shell) and adsorption of cationic dyes

AbstractBACKGROUNDThis study investigates the adsorption of methylene blue (MB) and malachite green (MG) onto a novel biosorbent. Rapid industrialization pollutes water resources, causing serious environmental problems. Physical and chemical treatments were performed for biosorbent modification.RESULTSIn the present work, nano (n)TiO2 was inserted into chitosan (Cts)‐epichlorohydrin (ECH)‐plum kernel shell (PKS) and the final product was characterized by various modern techniques such as Fourier transform infrared, X‐ray diffraction, scanning and transmission electron microscopy and thermogravimetric analysis. Under optimized conditions, the maximum adsorption capacities of MB and MG by Cht/PKS/nTiO2‐ECH (termed nTiO2‐Composite) determined by the Langmuir model were 86.96 and 108.70 mg g−1, respectively. Thermodynamic parameters such as ΔG°, ΔH°, ΔS° and Ea were calculated, confirming the interaction of dyes with nTiO2‐Composite as exothermic and spontaneous.CONCLUSIONSThis study shows that the newly synthesized nTiO2‐Composite has a very high performance in dye removal. © 2021 Society of Chemical Industry (SCI).

Super-adsorbent poly(acrylic acid)/laponite hydrogel with ultrahigh mechanical property for adsorption of methylene blue

Dye pollution has become a serious threat to environment and human health. Although versatile hydrogels have attracted intensive attentions due to their outstanding adsorption properties, the ultrahigh adsorption capacity and mechanical property are still two critical challenges for the practical applications. Herein, a super-adsorbent poly(acrylic acid)/laponite (PAAc/Lap) nanocomposite hydrogel with ultrahigh mechanical property and adsorption capacity of methylene blue (MB) is prepared by incorporating physical cross-linking with sparse chemical cross-linking. The hydrogel possesses porous 3D network structures and a fairly high water penetration with 1360 times of swelling ratio, which can allow the internal adsorption sites to be fully exposed and facilitate the adsorption. The adsorption capacity of MB can reach up to 3846 mg/g, which is almost the first time that a PAAc-based adsorbent could display superior adsorption capacity of more than 3800 mg/g towards MB. Important factors affecting the adsorption are also investigated, and the adsorption behavior is well fitted by the pseudo-second-order model and Langmuir isotherm model. More importantly, the appropriate physical cross-linking and sparse chemical cross-linking in the polymeric network endows hydrogel with superior mechanical properties. The tensile stress and strain are as high as 1.18 MPa and 2192%, which can facilitate the expansive applications and practical treatment. Mechanism analyses illustrate that the electrostatic interactions and cation-exchange between the functional groups of hydrogel and MB molecules contribute to the extraordinary adsorption ability. The proposed PAAc/Lap hydrogel with ultrahigh adsorption capacity and mechanical property is highly promising as an efficient super adsorbent for water treatment.

Preparation and properties of porous ceramics from spodumene flotation tailings by low-temperature sintering

Porous ceramics were prepared with spodumene flotation talings (SFT), kaolin and low-melting point glass (LPG) powder, whose pores were formed by the chemical reaction of hydrogen peroxide (H2O2). LPG was used to reduce the sintering temperature of porous ceramics and kaolin was used to realize the adsorption to methylene blue (MB) of porous ceramics. The average flexural strength, compressive strength, apparent porosity, water absorption and maximum MB adsorption capacity were 5.60 MPa, 4.66 MPa, 52.27%, 44.32% and 0.7 mg/g, respectively. Moreover, the results of orthogonal experiments present that the sintering temperature and the dosage of H2O2 had great influence on the mechanical properties and apparent porosity of porous ceramics, respectively. The main reason for the improvement of mechanical properties of porous ceramics was that LPG gradually became soft with increasing the sintering temperature, which made the mineral particles adhere to each other closely. Kaolinite was not completely converted into metakaolin at 550 °C, which might be the main reason why porous ceramics had adsorption properties.