Bacillus-GO的制备及其对水中U(Ⅵ)的吸附  

Preparation of Bacillus-GO and Its Application of U(Ⅵ) Adsorption in Water

作　　者：李殿鑫 阳亦青 张鹏 李涛 杨军伟 LI Dianxin;YANG Yiqing;ZHANG Peng;LI Tao;YANG Junwei(School of Mines and Civil Engineering,Liupanshui Normal University,Liupanshui 553004,China)

机构地区：[1]六盘水师范学院矿业与土木工程学院,贵州六盘水553004

出　　处：《水处理技术》2021年第8期65-70,共6页Technology of Water Treatment

基　　金：贵州省科技厅自然科学基金(黔科合基础[2019]1293);贵州省教育厅自然科学基金(黔教合KY字[2019]138);六盘水师范学院高层次人才人才科研启动金(LPSSYKYJJ201808)。

摘　　要：通过海藻酸钠包裹氧化石墨烯(GO)和Bacillus,合成了吸附剂Bacillus-GO。对吸附前和吸附后的BacillusGO进行了表征,通过单因素实验研究了pH、反应时间、初始U(Ⅵ)含量、吸附剂用量等对Bacillus-GO吸附U(Ⅵ)的影响,并运用动力学和等温线研究了吸附过程。结果表明,在pH为6.0、吸附剂用量0.5 g/L、30℃、初始U(Ⅵ)的质量浓度15 mg/L条件下,U(Ⅵ)的最大吸附量为30.73 mg/g。吸附符合准2级动力学、Langmuir等温线。经5次解吸附-重复利用实验,Bacillus-GO对U(Ⅵ)的吸附量仍高于80%。Bacillus-GO是一种较为理想的U(Ⅵ)生物吸附材料。Bacillus-GO was synthesized by coating graphene oxide and Bacillus with sodium alginate. Bacillus-GO was characterized before and after adsorption. The effects of pH, reaction time, initial U(Ⅵ) content and the amount of adsorbent on the adsorption of U(Ⅵ) by Bacillus-GO were studied through single factor experiments. The adsorption process was studied by kinetics and isotherms. The results showed that under the conditions of pH of 6.0, adsorbent dosage of 0.5 g/L, temperature of 30 ℃ and initial mass concentration of U(Ⅵ) of 15 mg/L, the maximum adsorption capacity of U(Ⅵ) was 30.73 mg/g. The adsorption process accorded with pseudo second order kinetics and Langmuir isotherm. After five cycles of desorption and reuse experiments, the adsorption capacity of Bacillus-GO for U(Ⅵ) was still higher than 80%. Bacillus-GO is an ideal material for U(Ⅵ)biosorption.

关 键 词：氧化石墨烯 生物吸附 BACILLUS U(Ⅵ) 

分 类 号：X703.1[环境科学与工程—环境工程]