摘要
通过SEM和XRD等手段对800℃煅烧前后的牡蛎壳粉的显微形貌和组成进行了分析,探索了pH、温度、投加量等因素对煅烧后的牡蛎壳粉吸附水中Pb^(2+)和Cd^(2+)的影响,研究了煅烧后的牡蛎壳粉吸附水中重金属Pb^(2+)和Cd^(2+)的吸附动力学和吸附热力学特征。结果表明,煅烧后的牡蛎壳粉表面比未煅烧的牡蛎壳粉多了很多微小孔隙,牡蛎壳中的CaCO_3几乎完全变成CaO,煅烧后的牡蛎壳粉对重金属Pb^(2+)和Cd^(2+)的吸附过程符合Freundlich模型和拟二级动力学模型。因此,煅烧后的牡蛎壳粉对水中重金属Pb^(2+)和Cd^(2+)有较强的吸附性能,可净化受Pb^(2+)和Cd^(2+)污染的水体。
Phases and microstructure of pre-calcined and post-calcined were investigated by SEM and XRD.Adsorption kinetic and thermodynamic of heavy metals Pb2＋and Cd2＋on calcined oyster shell powder were studied.The effect of different pH,different temperature and different dosage of calcined oyster shell powder on adsorption of Pb2＋and Cd2＋was explored.The results show that particle size of the powder changed obviously and precursor powders undertake a series of decomposing during calcining.The study of adsorption isotherm model and adsorption kinetic model showed that the adsorption process of Pb2＋and Cd2＋on calcined oyster shell powder was fitted with the Freundlich model and the pseudo-second-order kinetic model.Therefore,the calcined oyster shell powder has strong adsorption properties for heavy metals Pb2＋and Cd2＋in water,and can purify water body polluted by Pb2＋and Cd2＋.The study on the removal of Cd2＋and Pb2＋in water by calcination of oyster shell powder will provides a theoretical basis for the resource utilization of wasted oyster shell.
作者
叶昆
吴卫红
姚志通
周溶冰
胡瑶
YE Kun;WU Weihong;YAO Zhitong;ZHOU Rongbing;HU Yao(School of Materials ＆ Environmental Engineering,Hangzhou Dianzi University,Hangzhou Zhejiang 310018,China)
出处
《杭州电子科技大学学报（自然科学版）》
2018年第5期72-78,共7页
Journal of Hangzhou Dianzi University：Natural Sciences
基金
学基金资助项目(41101213
51606055)
浙江省自然科学基金资助项目(LY14D010009)
关键词
重金属
贝壳废弃物
吸附性能
动力学
热力学
heavy metals
shell waste
adsorption performance
dynamics
thermodynamics
