SiO2/C复合微球的制备及其脱除水体中Cu（Ⅱ）和Cr（Ⅵ）的动力学和热力学  

Synthesis of SiO2/C Composite Microspheres and Removing Kinetics and Thermodynamics of Cu（Ⅱ） and Cr（Ⅵ） from Water

作　　者：徐泽忠 曹显志 龚哲清 甘杰军 谢劲松[3] 韩成良[3] XU Zezhong;CAO Xianzhi;GONG Zheqing;GAN Jiejun;XIE Jingsong;HAN Chengliang(Analysis and Testing Center,Hefei University,Hefei 230601,China;College of Materials Science and Engineering,Southeast University,Nanjing 211189,China;Department of Chemical and Materials Engineering,Hefei University,Hefei 230601,China)

机构地区：[1]合肥学院分析测试中心,合肥230601 [2]东南大学材料科学与工程学院,南京211189 [3]合肥学院化学与材料工程系,合肥230601

出　　处：《硅酸盐通报》2020年第1期309-314,共6页Bulletin of the Chinese Ceramic Society

基　　金：2018年合肥学院自然科学发展基金重点项目(18ZR08ZDB)

摘　　要：首先,将Stober法制备出的SiO2活性微球分散到抗坏血酸(VC)水溶液中,通过水热碳化法成功制备出了SiO2/C复合微球。采用XRD、SEM、TEM和BET等手段对产物的结构、形貌和比表面积进行了分析。然后,以Cu(Ⅱ)和Cr(Ⅵ)为目标污染物,对比研究了SiO2和SiO2/C对水体中上述两种金属离子的脱除效果。结果表明,SiO2和SiO2/C对Cu(Ⅱ)和Cr(Ⅵ)的吸附动力学满足准一阶动力学方程,吸附热力学过程符合Langmuir模型,但SiO2/C复合微球对Cu(Ⅱ)和Cr(Ⅵ)的去除量较高,且具有较好再生性能,经过6次循环使用后,对Cu(Ⅱ)和Cr(Ⅵ)的去除率仍高达95%和93%。Firstly,active SiO2/C microspheres were prepared by a Stober method.Then,SiO2/C composite microspheres were obtained from as-prepared SiO2 microspheres in ascorbic acid(VC)aqueous solution by conventional hydrothermal method.The samples were characterized by XRD,SEM,TEM and BET.Afterwards,adsorption kinetics and thermodynamics for Cu(Ⅱ)and Cr(Ⅵ)in water using SiO2 and SiO2/C were investigated comparatively.The results that adsorption kinetic models of two kinds of materials meet the first-order kinetic equation.Thermodynamics models conform to Langmuir equation.The stability composite can be used six times with removal rate of 95%and 93%for Cu(Ⅱ)and Cr(Ⅵ),respectively.

关 键 词：SiO2/C微球 重金属脱除 热力学与动力学 

分 类 号：TQ034[化学工程]