The characteristics of the zeolite modified by microwave and sodium acetate and its sorption of ammonia-nitrogen from simulated water sample were investigated.The results show that the modified zeolite by microwave-so...The characteristics of the zeolite modified by microwave and sodium acetate and its sorption of ammonia-nitrogen from simulated water sample were investigated.The results show that the modified zeolite by microwave-sodium acetate(SMMZ)has a high sorption efficiency and removal performance.The ammonia-nitrogen removal rate of SMMZ reaches 92.90%.The surface of SMMZ becomes loose and some pores appear,the specific surface area,total pore volume and average pore diameter increase after modification.Compared to the natural zeolite,SMMZ has a more concentrated pore size distribution in the range of 0-10 nm.The cation exchange capacity(CEC)of SMMZ is higher than that of the natural zeolite.And the ammonia nitrogen removal rate is consistent with the change of CEC.The SMMZ possesses rapid sorption and slow balance characteristics and ammonia-nitrogen sorption is consistent with both Langmuir adsorption isotherm model and Freundlich adsorption isotherm model.The adsorption kinetics of ammonia-nitrogen follows the pseudo-second order kinetic model.展开更多
以溴化十六烷基三甲基铵（HDTMA-Br）和浙江缙云产天然沸石为原料制备了HDTMA改性沸石,并通过实验考察了HDTMA改性沸石对Cr（Ⅵ）的吸附性能.结果表明：HDTMA改性沸石对Cr（Ⅵ）的吸附能力随粒径的减小而增强.粒径≤0.15 mm HDTMA改性...以溴化十六烷基三甲基铵（HDTMA-Br）和浙江缙云产天然沸石为原料制备了HDTMA改性沸石,并通过实验考察了HDTMA改性沸石对Cr（Ⅵ）的吸附性能.结果表明：HDTMA改性沸石对Cr（Ⅵ）的吸附能力随粒径的减小而增强.粒径≤0.15 mm HDTMA改性沸石吸附Cr（Ⅵ）较优的改性剂投加量为300 mmol/kg.HDTMA改性沸石对Cr（Ⅵ）的吸附能力随溶液pH值的增加而降低.共存的HCO3-和SO42-等阴离子会抑制HDTMA改性沸石对Cr（Ⅵ）的吸附.改性剂投加量为300 mmol/kg条件下制备得到的粒径≤0.15 mm HDTMA改性沸石对初始质量浓度5~25 mg/L Cr（Ⅵ）的吸附过程满足Langmuire等温吸附模型.展开更多
基金Project(51174017) supported by the National Natural Science Foundation of China
文摘The characteristics of the zeolite modified by microwave and sodium acetate and its sorption of ammonia-nitrogen from simulated water sample were investigated.The results show that the modified zeolite by microwave-sodium acetate(SMMZ)has a high sorption efficiency and removal performance.The ammonia-nitrogen removal rate of SMMZ reaches 92.90%.The surface of SMMZ becomes loose and some pores appear,the specific surface area,total pore volume and average pore diameter increase after modification.Compared to the natural zeolite,SMMZ has a more concentrated pore size distribution in the range of 0-10 nm.The cation exchange capacity(CEC)of SMMZ is higher than that of the natural zeolite.And the ammonia nitrogen removal rate is consistent with the change of CEC.The SMMZ possesses rapid sorption and slow balance characteristics and ammonia-nitrogen sorption is consistent with both Langmuir adsorption isotherm model and Freundlich adsorption isotherm model.The adsorption kinetics of ammonia-nitrogen follows the pseudo-second order kinetic model.
文摘以溴化十六烷基三甲基铵（HDTMA-Br）和浙江缙云产天然沸石为原料制备了HDTMA改性沸石,并通过实验考察了HDTMA改性沸石对Cr（Ⅵ）的吸附性能.结果表明：HDTMA改性沸石对Cr（Ⅵ）的吸附能力随粒径的减小而增强.粒径≤0.15 mm HDTMA改性沸石吸附Cr（Ⅵ）较优的改性剂投加量为300 mmol/kg.HDTMA改性沸石对Cr（Ⅵ）的吸附能力随溶液pH值的增加而降低.共存的HCO3-和SO42-等阴离子会抑制HDTMA改性沸石对Cr（Ⅵ）的吸附.改性剂投加量为300 mmol/kg条件下制备得到的粒径≤0.15 mm HDTMA改性沸石对初始质量浓度5~25 mg/L Cr（Ⅵ）的吸附过程满足Langmuire等温吸附模型.
