Sips Isotherm Model Research Articles

Cadmium binding mechanisms and adsorption capacity by novel phosphorus/magnesium-engineered biochars

Novel phosphorus/magnesium-engineered biochars were prepared from poultry litter and tested for their Cd2+ retention capacity, unraveling the adsorption mechanisms. Batch experiments were conducted to evaluate the adsorption ability of Cd2+ by biochars and a wide range of characterization techniques were used: scanning electron microscopy with energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, surface area and pore volume, and X-ray photoelectron spectroscopy. Results showed that, in general, Cd2+ removal did not drastically change with initial pH variation and was relatively fast (up to 3 h); the pseudo-second-order kinetic model provided slightly better fitting to the data. Cadmium adsorption capacities of the P/Mg-engineered biochars were much higher than that of the unmodified biochar (up to 113.9 mg g−1), following the SIPS isotherm model. The surfaces of the biochars contain a rich variety of oxygen-containing functional groups as well as phosphate groups. Since the specific surface areas of the biochars are considered low (up to 25.19 m2 g−1), surface groups contributed more to Cd2+ retention. Biochars can be represented by type II isotherms with significant type H3 hysteresis patterns, which suggest the presence of asymmetrically slit-shaped pores. Complexation and precipitation were the predominant adsorption mechanisms. Thus, P/Mg-engineered biochars produced from poultry litter are considered effective and eco-friendly adsorbents for Cd2+ removal from aqueous medium, especially PLB-H3PO4-MgO, which is produced from low-cost materials.

Evaluation of the 17-α-Ethinyl Estradiol Sorption Capacity in Soil

17-α-Ethinyl estradiol (EE2) is a widely used drug that acts in the endocrine system and in the environment; even at low concentrations, it causes extensive damage to organisms. The most relevant factors for understanding the EE2 degradation and transport mechanisms in soil are through sorption studies. This study investigated the sorption capacity of EE2 in soil collected amidst vegetation in the region of Sorocaba, Sao Paulo state, Brazil. The soil samples were submitted to the evaluation of the physical-chemical parameters to characterization. The zero point of charge test (ZPC) was run using the adapted method of the 11-point model. Kinetic tests were then carried out, varying the removal times of the samples with fixed EE2 concentration, whereas, for the isotherm tests, the concentrations were varied, and the fixed contact time was maintained. The final concentrations of EE2 were quantified by high-performance liquid chromatography. Data treatments were carried out using mathematical modeling tests present in the literature. The soil presented a medium texture, being predominantly sandy, and the chemical parameters were classified as high and medium. Only the pH parameter was classified as low. The ZPC was 5.57, indicating an adsorption favorable to the EE2 that presented an average pH of 5.73. The adsorption kinetics showed that the equilibrium time for EE2 in contact with the soil is 12 h. The adsorption isotherm presented values related as favorable and adjustable to the Sips isotherm model and estimated the maximum adsorption capacity of 154.2 mgEE2 Kgsoil−1, showing affinity with EE2.

Combustion synthesis of Fe3O4/Ag/C nanocomposite and application for dyes removal from multicomponent systems

The Fe3O4/Ag/C nanocomposite was successfully prepared by combustion synthesis using citric acid as fuel. The composition, morphology and structure of the nanocomposite were investigated by Mössbauer spectroscopy, X-ray diffraction (XRD), thermogravimetric (TG)/differential scanning calorimetry (DSC), scanning electron microscopy (SEM)-energy dispersive X-ray (EDX), transmission electron microscopy (TEM) and N2 adsorption-desorption technique.The magnetic nanocomposite was tested as adsorbent for the removal of Methylene Blue, Acid Orange 7 and Rhodamine 6G in single and multi-component system from aqueous solutions. The effects of solution pH, contact time, adsorbent dose, and initial pollutants concentration on the dyes adsorption were studied. It was demonstrated that working in normal conditions, i.e. solution pH and room temperature (25 °C), removal percentage higher than 90% for single and binary-systems and higher than 75% for ternary-systems was obtained.Adsorption kinetic results showed that pseudo-second-order model describe the experimental data/adsorption process in single and multiple-solute systems. From the Sips isotherm model the maximum adsorption capacities in single systems were determined.The advantage of obtaining low-cost Fe3O4/Ag/C nanocomposite with good adsorption capacity and easy magnetic separation, effective in single and multi-component adsorption of both cationic and anionic dyes, represent a strong argument regarding its great potential for practical applications.

Error Analysis of Adsorption Isotherm Models for Sulfamethazine onto Multi Walled Carbon Nanotubes

In the present study, Multi walled carbon nanotubes (MWCNTs) was used for the adsorption of Sulfamethazine (SMZ) antibiotics. The adsorbent was characterized by scanning electron microscopy, surface area (BET) and transmission electron microscopy. Batch experiments were carried out by varying the parameters like contact time, adsorbent dosage and initial Sulfamethazine concentration at fixed pH and temperature. The equilibrium data were tested with Langmuir, Freundlich, Tempkin, Dubinin–Radushkevich (D–R), Redlich-Peterson (R-P), Sips, Toth and Khan isotherm models at five Error Analysis EABS, X2, ARE, RMSE and SD and it was found that the Langmuir and Toth isotherms best fitted the adsorption of SMZ with highest value of R2 and lowest overall experimental error. Also according to the results, a maximum removal efficiency of 99.1% was obtained at pH of 7 and the contact time of 60 min; initial SMZ concentration 20 mg/L and adsorbent dose 0.8 g/L.

In situ synthesis of hierarchical cobalt-aluminum layered double hydroxide on boehmite surface for efficient removal of arsenate from aqueous solutions: Effects of solution chemistry factors and sorption mechanism

A facile route is reported for the in situ formation of three-dimensionally structured hierarchical Co-Al layered double hydroxide (CoAl-LDH) crystals on a boehmite surface (CoAl-LDH@boehmite) via the dissolution of boehmite followed by the coprecipitation of Co and Al ions on the boehmite surface. The physicochemical properties of the as-prepared materials were characterized and tested for evaluating their sorption affinity toward arsenate (As(V)) in an aqueous solution. The characterization results confirmed that the plate-like CoAl-LDH nanocrystals were densely and uniformly formed on the boehmite surface with a three-dimensional hierarchical structure. Batch experiments were conducted systematically to evaluate the effects of the sorbent dosage, initial pH, competitive anions, and temperature on the sorption behavior of CoAl-LDH@boehmite. The sorption kinetics and isotherms studies indicated that the As(V) sorption processes could be well described by the pseudo-second-order and Sips isotherm models, respectively. The sorption mechanisms were confirmed by various solid phase analyses, including X-ray diffraction, Fourier transform infrared, transmission electron microscopy, X-ray photoelectron spectroscopy, and extended X-ray absorption fine structure. These findings suggest that the intercalation of As(V) into the interlayer region via anion exchange and bidentate-binuclear inner-sphere surface complexation due to ligand exchange were responsible for the removal of As(V) by CoAl-LDH@boehmite.

Elimination of Cs+ from aquatic systems by an adsorbent prepared by immobilization of potassium copper hexacyanoferrate on the SBA-15 surface: kinetic, thermodynamic, and isotherm studies.

For elimination of cesium from aqueous solutions, mesoporous SBA-15 was synthesized and employed as the support for immobilization of potassium copper hexacyanoferrate. The synthesized adsorbent was characterized by various techniques and was used for adsorption of cesium. The results indicated that its adsorption capacity was 174.80mg/g and superior to many studied adsorbents. The adsorbent represented good selectivity in the presence of some studied co-existing. The Temkin, Redlich-Peterson, Sips, Langmuir, and Freundlich isotherm models were used to evaluate the experimental data. The error analysis performed by EABS, ERRSQ, and HYBRID methods showed that the data was in good agreement with the Langmuir model indicating that the process was monoenergetic and the uptake of cesium forwarded through monolayer process. The pseudo-second-order model was recognized as the adequate model to describe the kinetic data of the adsorption process. The adsorption process was endothermic and spontaneous. The regeneration tests revealed that the adsorbent retained most of initial capacity after recovery.

Adsorption of arsenate from aqueous solution by ferric oxide-impregnated Dowex Marathon MSA anion exchange resin: application of non-linear isotherm modeling and thermodynamic studies

The characteristic of adsorption of As(V) onto ferric oxide-impregnated anion resin Dowex marathon MSA (FO-Dowex) was investigated. Batch adsorption experiment was studied as a function of pH, contact time, initial As(V) concentration, and temperature. The results revealed that the adsorption of As(V) onto FO-Dowex was highly pH-dependent and that the equilibrium time was attained within 360 min. Two-parameter equations (Langmuir, Freundlich, and Temkin) and three-parameter equations (Redlich–Peterson and Sips) isotherm models were used for modeling the experimental data for As(V) adsorption onto FO-Dowex at different temperatures through the non-linear regression method. The goodness of fit of the isotherm model to the experimental data was evaluated by comparing the statistical values of the coefficient of determination (R2), Chi-square (χ2) and the root mean square error (RMSE). From the isotherm analysis, the equilibrium data of As(V) adsorption onto FO-Dowex were found to be in good agreement with the Redlich–Peterson, Sips, and Langmuir isotherm model, based on the higher R2 value and the lower values of χ2 and RMSE as compared to other isotherm models. Furthermore, the calculation of thermodynamic parameters such as Gibbs free energy change (ΔG°), enthalpy change (ΔH°), and entropy change (ΔS°) revealed that the adsorption process was feasible, spontaneous, and endothermic in nature. All the results suggested that FO-Dowex could be used an effective and potential adsorbent for the removal of As(V) from aqueous solutions.

Magnetic silica coated iron carbide/alginate beads: Synthesis and application for adsorption of Cu (II) from aqueous solutions.

In the present study, a novel and high efficient magnetic alginate beads containing Fe5C2@SiO2 nanoparticles (NPs) were synthesized and applied to remove Cu (II) ions from water. The synthesized Fe5C2@SiO2 NPs were characterized by scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). The elemental content of the magnetic/alginate beads before and after Cu(II) adsorption was analyzed using energy dispersive X-ray spectroscopy (EDS). The influence of important factors such as pH, contact time and initial Cu (II) concentration on the adsorption capacity of magnetic/alginate beads was investigated. The maximum adsorption percent (97.4%) was attained in the pH range of 3-4 and the adsorbent dosage of 0.41 g/L in the Cu (II) concentration of 200 mg/L. Moreover, the maximum capacity of adsorption was compared with silica coated iron carbide alginate and alginate alone. The results showed with adding a 1 mg of silica coated iron carbide NPs to sodium alginate enhanced the adsorption capacity of copper ions to ca. 2 times. The Sips isotherm model was best fitted to the experimental data with the maximum adsorption capacity of 37.73 mg/g for each layer. The adsorption kinetic followed the pseudo-second order kinetic model. These results reveal that the alginate Fe5C2@SiO2 beads could be a candidate for copper ions removal from aqueous solutions.

The adsorptive properties of oxidized activated carbons and their applications as carbon paste electrode modifiers

The adsorptive properties of the Organosorb-10 activated carbons treated with different ozone doses (15 and 45 min) and their applications as carbon paste electrode (CPE) modifiers have been studied. As a target organic contaminant the 4-chlorophenol (4-CP) has been selected. Both the physical and chemical properties of the activated carbon surface were characterized and the results show only low changes in porous structure of the oxidized activated carbons but significant changes in their surface chemistry. The adsorption isotherms of 4-CP on the activated carbons were analyzed using the Langmuir, Freundlich and Sips isotherm models. The equilibrium data followed the Langmuir isotherm. The activated carbons prepared by ozonation presented lower 4-CP adsorption than the unmodified adsorbent. Introduction of oxygen functional groups decreased their adsorption properties. The modified CPEs were prepared by mixing graphite powder with the unmodified and oxidized activated carbons (2.5%, 5% and 10% wt. content) and used for cyclic voltammetry measurements in 4-CP solutions of different concentrations. The measured peak currents were strongly dependent on oxidation of activated carbons and correlated with the 4-CP adsorption efficiency.

Development of chitosan-poly(ethyleneimine) based double network cryogels and their application as superadsorbents for phosphate

The fabrication of novel chemically cross-linked double network cryogels (DNC), with an abundant number of amine groups, based on chitosan (CS) cross-linked with glutaraldehyde (GA), as the first network, and poly(ethyleneimine) (PEI), with a concentration up to 15% cross-linked with ethyleneglycol diglycidyl ether (EGDGE), as the second network, and their enhanced sorption capacity for phosphate ions are presented here. The phosphate sorption was fast (equilibrium in three hours) and well modeled by the pseudo-second-order kinetic model. The experimental sorption isotherms were fitted with Langmuir, Freundlich, Sips and Dubinin-Radushkevich isotherm models. The Langmuir and Sips isotherms were the best in modeling the sorption process. The maximum sorption capacity given by the Langmuir isotherm for the DNC having the highest content of GA and the highest concentration of PEI was about 343 mg phosphate/g, which placed this novel sorbent among the best sorbents for phosphate recently reported in literature.

Use of chemically activated termite feces a low-cost adsorbent for the adsorption of norfloxacin from aqueous solution.

Antibiotics, as emerging contaminants, are of global concern due to the development of antibiotic resistant microorganisms. Current wastewater treatment technology cannot efficiently remove sewage antibiotics and therefore new low-cost technologies are needed. Adsorption is a widely used process for removal of substances, and the search for efficient, low-cost adsorbents is ongoing. In this work, termite feces treated with H2SO4 (FT/H2SO4) were used as a low-cost adsorbent for removal of norfloxacin (NOR) present in aqueous medium. Termite feces were treated with H2SO4 at a ratio of 1:1 for 24 h, at 100 °C. The parameters contact time, initial NOR concentration, medium pH and temperature were evaluated. The optimum adsorption pH was 8.0. The pseudo-second-order model was found to best represent the kinetics of NOR adsorption. The maximum adsorption capacity, calculated from the Sips isotherm model, was 104.4 mg/g at 55 °C. The positive values of ΔH0 (change in enthalpy) confirm the endothermic nature of the adsorption. The results show that FT/H2SO4 is an efficient adsorbent for removal of NOR present in aqueous medium. The adsorption capacity is higher than those reported in the literature for other low-cost adsorbents.

Insights into the single and binary adsorption of copper(II) and nickel(II) on hexagonal boron nitride: Performance and mechanistic studies

A series of hexagonal boron nitrides (h-BNs) was developed using a facile method involving pyrolysis of urea and boric acid mixture at different temperatures. The as-prepared h-BNs were characterized using XRD, FESEM, FTIR, BET and XPS and the results indicated that the as-prepared h-BNs consist of microparticle structures with BET specific surface area between 12–18 m2 g−1. The h-BN prepared at 750°C (BN-750) displayed excellent adsorption capacities for both Cu(II) and Ni(II) (up to 200 and 95 mg g−1, respectively) compared to those prepared at other temperatures. At higher metal ion concentrations (>250 mg L−1), multilayer adsorption was observed. The equilibrium adsorption modelling study indicated that the adsorption process was best fitted to the Langmuir (R2>0.97) and Sips (R2>0.98) isotherm models. The binary adsorption of Cu(II) and Ni(II) was also investigated and the results revealed that the BN-750 has higher adsorption affinity for Cu(II) compared to Ni(II). Detailed analyses of the spent adsorbent using XPS and FTIR indicated that the oxygen functional groups of BN-750 played an important role in facilitating the electrostatic attraction and complexation of heavy metal during adsorption process. Furthermore, the results confirmed that Cu(II) and Ni(II) occupied the same active sites on BN-750. The results of this study revealed insights into the adsorption mechanism of Cu(II) and Ni(II) on BN-750 and demonstrated that the as-prepared h-BN is a promising adsorbent for efficient heavy metal removal in aqueous system.

Studies on batch adsorptive removal of malachite green from synthetic wastewater using acid treated coffee husk: Equilibrium, kinetics and thermodynamic studies

Coffee husk treated with sulfuric acid (ACH) is used as a low-cost adsorbent for batch adsorptive removal of malachite green (MG) from synthetic dye solution. Structural and morphological characteristics of the prepared ACH adsorbent were analyzed by powder X-ray diffraction, Raman spectroscopy, and scanning electron microscopy. The effects of pH (2–9), adsorbent dose (0.05–1 g/L), initial adsorbate concentration (25–150 mg/L), contact time (0–120 min) and temperature (30 – 60 °C) on adsorption were studied. The adsorption of MG on ACH is confirmed by Fourier transform infrared spectroscopy. Further, modelling of isotherms, kinetics, and thermodynamics was carried out using various mathematical equations. The Sips isotherm model and pseudo-second-order kinetic model fitted best with experimental data with R2 > 0.98. The diffusion model analysis indicates the adsorption process is governed by both film and intra-particle diffusion. The maximum adsorption capacity of acid treated coffee husk was found to be 263 mg/g. Thermodynamic studies revealed that the adsorption of MG on ACH is endothermic (ΔH0 = 7.83 kJ/mol), feasible (ΔG0 = −20.10 to −22.87 kJ/mol) and spontaneous (ΔS0 = 0.092 kJ/mol K). Energies of adsorption calculated from various equations showed that adsorption is a physical process. This study shows that ACH can be a promising and efficient low-cost adsorbent for the removal of MG from industrial wastewater.

Adsorption of nicotine from aqueous solutions on montmorillonite and acid-modified montmorillonite

Montmorillonite (Mt) and acid modified montmorillonite (MtA) were tested as nicotine adsorbents. The samples were characterized using FT-IR spectroscopy and low temperature nitrogen physisorption. Nicotine adsorption was performed with respect to contact time, pH and initial nicotine concentration. The kinetics of adsorption obeyed the pseudo-second-order kinetics. The optimal pH values for nicotine adsorption were 6 and 9 for Mt and MtA, respectively. The isotherms related to adsorption on Mt at pH = 6 and 9 as well as for MtA at pH=6 were best fitted with Sips isotherm model, while adsorption onto MtA at pH=9 obeyed Langmuir isotherm model.

Characterization and adsorptive behaviour of snail shell-rice husk (SS-RH) calcined particles (CPs) towards cationic dye

In this study, a low-cost composite adsorbent was prepared from snail shell and rice husk (SS-RH) through calcination for brilliant green dye (BGD) adsorption from aqueous solution. Six two-parameter and three three-parameter isotherm models were used to fit the experimental data by both linear and non-linear regression methods using ten error functions. Linear and non-linear regression analysis coupled with linear and non-linear fit error functions all revealed Langmuir and Sip as two- and three-parameter isotherm models well-fitted for BGD uptake from aqueous solution using calcined particles (CPs) of SS-RH. Chi-square (χ2) error function proved to be the best applicable predictive error function for the two-parameter isotherm study while sum of absolute error (EABS), hybrid functional error (HYBRID) and normalized standard deviation (NSD) are the best error functions for non-linear Redlich-Peterson, Sips and Toth three-parameter isotherm models respectively. Irregular surface texture was observed for the calcined particles of SS-RH as revealed by SEM with BGD filling the opening pores after adsorption. FTIR revealed shift in spectrum broad peaks after adsorption. EDS exhibited active mixed metal oxides formation before adsorption with the observance of weight percent change after adsorption.

Adsorption and desorption of acetylsalicylic acid onto activated carbon of babassu coconut mesocarp

Activated carbon of babassu coconut mesocarp (ACB), which is an environment-friendly material (low-cost), was evaluated as alternative adsorbent for the adsorption and desorption of acetylsalicylic acid (ASA) from aqueous solution. ASA is a non-steroidal anti-inflammatory pharmaceutical easily acquired and prescribed worldwide, and not completely removed by wastewater treatment plants (WWTPs). For this reason, properties of ACB (untreated) were characterized by N2 adsorption/desorption, FTIR spectroscopy, SEM, Boehm titration method and pHPZC. The microporous nature of ACB strongly influenced both the adsorption of ASA and the occurrence of physical adsorption bonds, which allows the reversibility of the reaction. ACB surface was rich in carboxylic and phenolic groups. The adsorption was best described by the pseudo-second order kinetic model (89.87 mg g−1) at pH 2.0, which represented 80% of ACB adsorption capacity. Conversely, desorption was best represented by pseudo-first-order kinetic model (15.07 mg g−1) at pH 6.4, which corresponded to approximately 25% of ASA desorption capacity. Sips isotherm model was best fitted to the equilibrium data of adsorption (50.400 mg g−1) at pH 2.0 and desorption (85.213 mg g−1) at pHPZC 6.4. The negative ΔH° showed that adsorption (−23.45 kJ mol−1) and desorption (−5 × 105kJ mol−1) were exothermic processes. In addition, the regeneration capability, evaluated through the cycles of reuse, indicated increase of the adsorption and desorption capacities of 53.36% and 32.71%, respectively.

Adsorption of Hexavalent Chromium by Eucalyptus camaldulensis bark/maghemite Nano Composite

Abstract In the present study, Eucalyptus camaldulensis bark/maghemite composite (ECMC) was used for potential application as a low-cost adsorbent for the removal of Cr(VI) from aqueous solution. The structural characterization, morphology and elemental analysis of ECMC were performed by Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray (EDX) and X-ray Diffraction (XRD). The effects of various independent parameters, contact time, initial Cr(VI) concentration, temperature, pH, and adsorption were investigated. It was found that the adsorption capacity of ECMC increases with increasing Cr(VI) concentration and temperature. The optimum pH was found to be 2 for the removal of Cr(VI) by ECMC. The adsorption capacity was found to be 70.1 mg/g with 0.1 g ECMC at pH 2 and 30 °C. Additionally, 10 and 50 mg/L Cr(VI) were removed from 100 mL aqueous solution by 0.1 g ECMC with 99 % and 93.46 % removal efficiencies, respectively. Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Jovanovic, Smith, Koble Korringen, Vieth-Sladek and Sips Isotherm Models were applied to the experimental data to understand the adsorption mechanism better. The Freundlich Isotherm Model described the adsorption process better (R2 = 0.991) among the other isotherms studied.

Use of waste Japonochytrium sp. biomass after lipid extraction as an efficient adsorbent for triphenylmethane dye applied in aquaculture

Comprehensive processing of Japonochytrium sp., one of marine fungi considered as a perspective source of functional lipids, was tested as an example of circular economy. Residual biomass after extraction of lipids (omega-3 polyunsaturated fatty acids and triacylglycerols) was magnetically modified using methanol suspension of microwave-synthesized magnetic iron oxides and tested as a potential biosorbent for triphenylmethane dye, crystal violet, used in aquaculture. Employing a batch experimental setup, influence of pH value (3–9), incubation time (0–270 min), initial dye concentration (400–1000 mg/L) of crystal violet, and temperature (282.15–313.15 K) on adsorption efficacy was studied. Adsorption equilibrium data were analyzed and fitted to the Langmuir, Freundlich, and Sips isotherm models. The monolayer maximum adsorption capacity of magnetically responsive spent biomass was found to be 329.22 mg/g at 294.15 K. The adsorption process agreed best with the pseudo-second-order kinetic model, and thermodynamic studies showed an endothermic nature of adsorption.

Adsorption equilibria and kinetics of CO2, CO, and N2 on carbon molecular sieve

Adsorption equilibria and kinetics of CO2, CO, and N2 on carbon molecular sieves (CMSs) were measured by a gravimetric method at temperatures of 298, 308, and 318 K and pressures up to 10 bar. The validity of the experimental isotherms and kinetics was confirmed by comparing with experimental results from an additional volumetric method. Experimental adsorption isotherms were well correlated with a temperature-dependent Sips model and the results were compared with the Langmuir and Sips models. The order of the adsorbed amounts and isosteric heats of adsorption were CO2 > CO ≥ N2 and their heats of adsorption changed from vertical interactions to lateral interactions with an increase in loading amount. The adsorbed amounts and heats of adsorption were lower for the CMSs than those of activated carbon, which has higher surface area and pore size. The microporous diffusional time constants (Dμ/r2) of CO and N2 could be obtained from an isothermal kinetic model, while a non-isothermal kinetic model was required for CO2 due to its higher heat of adsorption and adsorption rate. In addition, the variation in Dμ/r2 with surface coverage were well correlated by the Darken relation combined with Sips isotherm model, and a steep variation was observed from a surface coverage of 0.2 in all the components. The adsorption rate was highly affected by the electrical properties of the adsorbate rather than kinetic diameters. The order of adsorption rate was CO2 ≫ CO > N2, while the order of the activation energies in the Arrhenius equation was opposite. The validity of obtained equilibria and kinetics results was confirmed by comparing the experimental breakthrough curves and dynamic simulation results in a CMS bed.

Efficient removal of malachite green from wastewater by using boron-doped mesoporous carbon nitride

In this study the adsorption performance of boron doped mesoporous carbon nitride (BMCN) was studied for the elimination of malachite green (MG) dye from wastewater. BMCN with various weight ratios of boron doping was prepared in two steps including using a hard template to synthesize MCN, and then addition of boric acid as the boron source to produce BMCN. 1 wt% boron doping displayed the highest removal efficiency and adsorption capacity. The new adsorbent was analyzed using XRD, N2 adsorption-desorption, TEM, SEM-EDX and its elemental mapping, and FT-IR. Four critical parameters optimized by response surface methodology (RSM) method were temperature, initial dye concentration, pH and sorbent weight for MG adsorption. The maximum removal (100%) predicted from RSM was reported for 18 mg of the sorbent at pH 5 and MG concentration of 20 mg L−1 at room temperature. The boron doped mesoporous carbon nitride showed a high maximum adsorption capacity about 310 mg g−1 and reached at the equilibrium within 30 min followed the pseudo-second-order kinetic model with 99.8% MG removal while the rate-limiting step is the intraparticle diffusion stage. The adsorption phenomena matched well to the heterojunction surface Freundlich, Koble-Corrigan, and Sips isotherm models. The BMCN1 showed excellent reusability and was applied for six cycles of regeneration effectively, while its removal efficiency remained at a high value.