摘要
用水泥作胶凝剂,以牡蛎壳为主要原料,不经煅烧直接成型制备废水除铅吸附剂。探讨了吸附剂配方、含铅废水的初始浓度和pH值对除铅效率的影响,确定了吸附剂样品的最佳配方及除铅条件。结果表明:吸附剂样品的最佳配方组成为牡蛎壳粉质量含量为90%,水泥为10%,样品的抗折强度达到11.26 MPa;当含铅废水的初始浓度为5 mg/L、pH值为5时,吸附剂样品的除铅率达到90%以上,可以同时满足除铅效率和回收再利用强度要求。其吸附机理兼有物理和化学吸附。
An absorbent for lead removal was prepared by a direct shaping method without any calcined process using oyster shell as a main raw material and Portland cement as a binder. The effects of raw material composition, initial lead concentration and pH value in waste water on the lead removal efficiency were investigated to determine the suitable conditions for lead removal. The micro- structure of the samples before and after lead removal was analyzed by scanning electron microscopy. The results show that the bending strength of adsorbent sample is 11.26 MPa, and the lead removal efficiency can reach 90% at pH value of 5 when the optimum raw ma- terial composition is oyster shell powder of 90% and Portland cement of 10%. The lead absorption mechanism with the oyster shell mate- rials belongs to both physical and chemical adsorptions.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2012年第9期1284-1288,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金项目(51102047)
福建省科技厅重点项目(2011Y0037)
福建省杰出青年科学基金(2012J06011)资助
关键词
废水
除铅
牡蛎壳粉
水泥
吸附剂
waste water
lead removal
oyster shell powder
Portland cement
absorbent
