建筑垃圾转化砷吸附材料的方法及其吸附性能

Systhesis and characterization of arsenic adsorption material from construction and demolition waste

水环境中的砷污染问题近年来越来越突出,吸附是主要的净化途径之一。以建筑垃圾为主要原材料,合成了一种新型的廉价除砷颗粒吸附剂。首先通过烧结制备多孔陶粒,再利用水热过程将陶粒基体转变为沸石基体,最后利用铁离子对沸石基体进行表面改性,制备出具有复合多级孔结构的铁负载沸石陶粒(简称IMZC)产品。XRD图谱显示负载的铁主要以无定形体存在,显著增加了沸石基体的比表面积。吸附实验表明,老化时间和pH值对铁改性沸石颗粒的吸附能力有显著影响,该吸附过程可以用Langmuir模型表征,最大吸附量达到18.727 mg·g^(-1)。

Aquatic arsenic contamination is becoming increasingly severe, and adsorption is one of the main methods for water purification. In this study, a novel granular adsorbent was developed from construction and demolition waste. Initial porous ceramsite was prepared through sintering and converted to zeolite ceramsite by hydrothermal treatment. Finally, iron-modified zeolite ceramsite （IMZC） , with a hierarchical porous structure, was synthesized through surface modification by iron. XRD patterns showed that iron loaded on IMZC was mainly amorphous and significantly increased the specific surface. Adsorption experiments showed that the adsorption ca- pacity was closely related to the aged time and pH value. An adsorption isotherm study indicated that adsorption behavior was sufficiently described by the Langmuir model,and qmax reached 18. 727 mg · g^-1 IMZC has good application prospects as a granular adsorbent for arsenic removal from non-point pollution or accidental contami- nations.