Nano-HCO吸附剂的制备及其除As(Ⅲ)性能

Preparation of Nano-Hydrous Ceric Oxide and Its Adsorption Characteristics of Arsenite

采用溶胶沉淀结合超声分散处理的方法,制备平均粒径为70 nm,比表面积为212 m^2·g^-1的纳米级水合氧化铈（Nano-HCO）吸附剂.在pH值为4-10,初始As（Ⅲ）质量浓度为10 mg·L^-1,吸附剂投加量为1.0 g·L^-1的反应条件下,可在2 h内将溶液中As（Ⅲ）质量浓度降低到0.01 mg·L^-1以下.Nano-HCO吸附剂对砷的吸附等温线服从Langmuir方程,对应不同pH值,其对As（Ⅲ）的吸附容量较未经超声分散处理的水合氧化铈提高29%-141%,且水温的升高有助于增加As（Ⅲ）的吸附程度.

Abstract： Nano-sized hydrous ceric oxide （Nano-HCO） with an average diameter size of 70 nm and specific surface area 212 m^2 · g ^-1 were prepared using sol-precipitation method in conjunction with ultrasonic dispersion. At an initial As（ Ⅲ ） concentration of 10 mg · L^-1 , solution pH range 4-10, adsorbent dose of 1.0 g · L^-1 , a final concentration of As（ Ⅲ ） could be decreased below 0. 01 mg · L^-1 , within 2 h. The isotherms fit well in the Langmuir model of adsorption, and with the studied pH conditions, the adsorption capacity of As（Ⅲ） on Nano-HCO was increased by 29% to 141% compared with the HCO samples prepared without ultrasonic dispersion treatment. The extent of As（ Ⅲ ） adsorption was enhanced by increasing ambient temperature.