以海藻酸钠(SA)和氧化石墨烯(GO)为原料,采用超声分散和化学交联法制备了GO/SA凝胶球复合材料。采用傅里叶红外光谱仪和配有能谱仪的扫描电镜对其结构和形貌进行了表征。以锌镍电镀废水中Ni2+为目标污染物,考察了GO与SA配比[m(GO)∶m(SA)]、GO/SA凝胶球投加量对Ni2+吸附的影响,并对其吸附动力学和吸附等温线类型进行了探讨。结果表明:当m(GO)∶m(SA)为1∶9,GO/SA凝胶球投加量为40g/L时,Ni2+的去除率和吸附容量分别为24.119%和100.888mg/g。吸附过程符合准二级动力学模型(R2>0.99),颗粒内扩散方程拟合结果表明GO/SA凝胶球对Ni2+吸附受表面层扩散和颗粒内扩散共同控制。吸附等温线拟合发现Freundlich(R2>0.99)模型能很好地描述Ni2+吸附行为。
Using graphene oxide and sodium alginate as raw material,graphene oxide/sodium alginate(GO/SA) gel ball composites was prepared by using ultrasonic dispersion and chemical crosslinking.The phase composition and microstructure were characterized by FT-IR,SEM equipped with EDS.Ni2+ in zinc-nickel plating wastewater was selected as target pollutant.The effects of the quality ratio of GO and SA and the dosage of GO/SA gel ball on Ni2+ adsorption was investigated.The adsorption kinetics and isotherm type were also studied.The experimental results shown that the removal of Ni2+ was up to 24.119% and the adsorption capacity of Ni2+ was 100.888mg/g respectively when the quality ratio of GO and SA was 1∶9 and the dosage of GO/SA gel ball was 40g/L.The adsorption kinetic could be well simulated by Pseudo-second-order model (R22>0.99).The results from the intra-particle model showed that the adsorption process was controlled by both surface layer diffusion diffusion and intra-particle diffusion.Adsorption isotherms for Ni2+ followed freundlich(R2F>0.99).
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