生物炭
吸附
吸热过程
水溶液
弗伦德利希方程
亚甲蓝
化学
朗缪尔吸附模型
朗缪尔
傅里叶变换红外光谱
核化学
化学工程
分析化学(期刊)
色谱法
热解
有机化学
光催化
工程类
催化作用
作者
Asiye Özer,Mahmut Toprak
摘要
Abstract Magnetic biochar was prepared in one step with simultaneous activation and magnetization processes under CO 2 atmosphere in the presence of a mixture of FeCl 3 ·6H 2 O and hawthorn seeds as precursor. The magnetic biochar used as a potential adsorbent for the removal of methylene blue (MB) from aqueous solution was characterized by BET, FTIR, SEM and vibrating sample magnetometer. The produced magnetic biochar showed a high surface area of 489.166 m 2 /g, a pore size of 2.16 nm, a pore volume of 0.26 cm 3 /g and a saturation magnetization of 29.84 emu/g. Batch adsorption studies were performed at different initial dye concentration, pH and temperature. The adsorption capacity of the magnetic biochar showed a good result for the adsorption of MB (147 mg/g). Of the two models used, the Langmuir isotherm fitted the equilibrium data better than the Freundlich isotherm. The kinetics study showed that the adsorption of MB was fitted better with pseudo‐second‐order kinetics model and the intra‐particle diffusion process was one of the main mechanisms controlling the adsorption rate. Moreover, thermodynamic parameters showed that the process of adsorption was endothermic and spontaneous. The experimental results showed that the magnetic biochar would be promising for practical wastewater treatment.
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