以海藻酸钠、膨润土、活性炭为原料,氯化钙为交联剂,采用溶胶-凝胶法制备海藻酸钠/膨润土/活性炭复合微球(G1),并考察其对亚甲基蓝的吸附性能及吸附机理。采用扫描电子显微镜、X射线衍射仪、傅里叶变换红外光谱仪对其进行表征分析。探讨了pH、投样量、和亚甲基蓝初始浓度、吸附时间等因素对吸附性能的影响。结果表明:G1在pH=4—11时均有很高的吸附效果,可直接采用自然pH进行研究;投加0.3g材料对初始浓度为100mg/L的亚甲基蓝有优异的吸附能力,吸附600min基本达到平衡;吸附过程符合拟二级动力学方程;Freundlich吸附等温模型能更好地描述MB的吸附行为(R2=0.993);通过计算可知,该复合材料对亚甲基蓝的最大吸附量可达206.404mg/g。经过7次循环使用,吸附量仍达初次使用的90%以上。
Sodium alginate,bentonite,and activated carbon were used as raw materials,and calcium chloride was used as a crosslinking agent to prepare sodium alginate/ bentonite/activated carbon composite microspheres (G1) by the sol-gel method.The adsorption performance and mechanism of G1 for methylene blue were investigated.The microspheres were characterized by scanning electron microscopy,X-ray diffraction,and Fourier transform infrared spectroscopy.The effects of pH,dosage,initial concentration of methylene blue,and adsorption time on the adsorption performance were studied.The results showed that G1 had a high adsorption effect at pH values of 4-11,and natural pH could be used directly for the study.Adding 0.3g of material had excellent adsorption capacity for methylene blue with an initial concentration of 100mg/L,and the adsorption reached equilibrium after 600min.The adsorption process followed the pseudo-second-order kinetic equation.The Freundlich adsorption isotherm model could better describe the adsorption behavior of methylene blue (R2=0.993).According to the calculation,the maximum adsorption capacity of the composite material for methylene blue was 206.404mg/g.After 7 cycles of use,the adsorption capacity still exceeded 90% of the initial use.
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