Isotherm,kinetic and thermodynamic investigations of boron phosphide to remove methylene blue from aqueous solution  

磷化硼去除水溶液中亚甲基蓝的等温线、动力学和热力学研究

作　　者：YILDIRIM Furkan Murat ISIK Birol UGRASKAN Volkan 

机构地区：[1]Department of Chemistry,Faculty of Arts&Sciences,Yildiz Technical University,Esenler,Istanbul 34220,Turkey

出　　处：《Journal of Central South University》2024年第9期3034-3049,共16页中南大学学报（英文版）

摘　　要：In this work,the boron phosphide(BP)was synthesized and used for the adsorptive removal of methylene blue(MB)dye from aqueous solutions.To determine the optimum adsorption conditions,studies were performed by varying parameters of temperature(298–328 K),pH(2–12),contact time(0–120 min),adsorbent dose(0.01–0.20 g/50 mL),and dye concentration(10–50 mg/L).Different isotherm and kinetic models were applied to the adsorption data.The linear correlations coefficient showed that the Langmuir isotherm best fits(R^(2)=0.9996).The maximum adsorption capacity of BP was obtained as 555.56 mg/g at 55℃and the removal rate reached up to 84.11%.Additionally,the pseudo-second-order kinetic model described the adsorption process best(R^(2)=0.9998).The thermodynamic studies represented that the adsorption occurred spontaneously(ΔG_(A)^(Θ)=−24.90 kJ/mol)and endothermically(ΔH_(A)^(Θ)=16.67 kJ/mol).The results showed that BP is an efficient adsorbent for removing cationic dyes from aqueous solutions.本研究合成了磷化硼(BP)并将其用于吸附去除水溶液中的亚甲基蓝(MB)染料。为了确定最佳吸附条件,研究了温度(298~328 K)、pH(2~12)、接触时间(0~120 min)、吸附剂剂量(0.01~0.20 g/50 mL)和染料浓度(10~50 mg/L)等参数的影响。采用不同的等温线和动力学模型对吸附数据进行了分析。线性相关系数显示Langmuir等温线拟合效果最佳(R^(2)=0.9996)。在55℃条件下,BP的最大吸附量为555.56 mg/g,去除率达84.11%。拟二级动力学模型对吸附过程的描述效果最好(R^(2)=0.9998)。热力学研究表明,吸附过程为自发吸附(△G_(A)^(Θ)=-24.90 kJ/mol)和吸热吸附(△H_(A)^(Θ)=16.67 kJ/mol)。结果表明,BP是一种可高效去除水中阳离子染料的吸附剂。

关 键 词：adsorption boron phosphide methylene blue 

分 类 号：X703[环境科学与工程—环境工程] O647.3[理学—物理化学]