摘要
铜污染引发的环境问题严重影响着人类的生命健康。本文以Zn(NO_3)_2·6H_2O和Na_2S·9H_2O为原料,水为溶剂,通过超声化学辅助法制备出纳米ZnS,并将其应用于水中铜离子的吸附脱除。利用FTIR、XRD、SEM和N2物理吸附等手段进行表征,研究了初始浓度、接触时间、处理温度、pH和竞争阳离子等对铜离子吸附容量的影响。结果表明,制得的纳米ZnS为单一立方相闪锌矿,颗粒呈不规则块状,孔道结构主要为纳米ZnS晶粒团聚形成的聚集孔,孔径分布较宽。该纳米ZnS表现出对水中铜离子良好的吸附性能,在吸附剂量200mg/L、铜离子初始浓度400mg/L、接触时间12h、处理温度25℃的条件下,饱和吸附容量高达629.8mg/L,水中Na^+和K^+对吸附性能无明显影响,且其对水中铜离子的脱除机理为离子交换与吸附的协同作用。
Environmental issues caused by copper pollution have seriously threatened human health. In this paper,zinc sulfide（ZnS） nanomaterials were successfully synthesized with the assistance of sonochemistry in an aqueous system of Zn（NO3）2·6H2O and Na2S·9H2O for the removal of Cu2＋ from aqueous solution. The prepared ZnS were characterized by means of FTIR,XRD,SEM and N2 physical adsorption. The influence of initial concentration,contact time,treat temperature,pH and competitive cations on adsorption capacities was investigated. The results showed that the prepared ZnS presented a crystalline structure of cubic zinc-blende phase and are in irregular block forms. The pore structure was mainly caused by agglomeration and had a wide pore diameter distribution. It showed excellent adsorption performance and the adsorption capacity can reach as high as 629.8mg/L under the experimental conditions as ZnS dosage of 200mg/L,initial concentration of 400mg/L,contact time of 12 h and treat temperature of 25℃. The addition of Na＋ and K＋ had no significant effect on the adsorption properties and the Cu2＋ removal by the ZnS nanomaterials was based on the synergistic effect of ion exchange and adsorption.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2017年第2期750-755,共6页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(51573041)
湖南省科技计划(2015JC3112)
湖南省自然科学基金(14JJ4043
2015JJ6036)
湖南省化学化工类专业校企合作人才培养示范基地(145812)项目
关键词
纳米材料
硫化锌
超声化学辅助法
离子交换
吸附
nanomaterials
zinc sulfide
sonochemistry-assisted method
ion exchange
adsorption
