桂花树干生物炭对水中亚甲基蓝的吸附性能研究

Study on adsorption performance of osmanthus trunk biochar on methylene blue in water

通过桂花树干制备生物炭,利用硝酸和高锰酸钾对桂花树干生物炭进行修饰(活化)处理,研究了其对水溶液中染料亚甲基蓝(MB)的吸附能力。研究了温度、pH值、吸附时间和初始浓度对生物炭染料吸附性能的影响。生物炭及改性生物炭准二级动力学拟合的判决系数均为0.999。准二级动力学模型模拟的平衡吸附量更符合实际值。采用扫描电镜(SEM)和紫外分析方法(UV-vis)对生物炭吸附剂改性前后进行了测试,研究表明:改性桂花树干生物炭可以作为合成染料的高效吸附剂。

Biochar was prepared from the trunk of Cinnamomum cassia and the dye methylene blue(MB)adsorption capacity in aqueous solution was investigated by using nitric acid and potassium permanganate to modify(activate)the biochar from the trunk of Cinnamomum cassia.The effects of temperature,pH,adsorption time,and initial concentration on the dye adsorption performance of biochar were investigated.The coefficients of judgment for the quasi-secondary kinetic fits of both biochar and modified biochar were 0.999.The equilibrium adsorption amounts simulated by the quasi-secondary kinetic model were more in line with the actual values.The biochar adsorbents were tested before and after modification using scanning electron microscopy(SEM)and ultraviolet analysis methods(UV-vis).It was shown that the modified laurel trunk biochar can be used as an efficient adsorbent for synthetic dyes.