载铝改性活性炭纤维电吸附水中Cr(Ⅵ)  

Electro-adsorption of Cr(Ⅵ)in Water on Aluminum Modified Activated Carbon Fiber

作　　者：李秀玲 黎长斌 李胜英 韦岩松 LI Xiu-ling;LI Chang-bin;LI Sheng-ying;WEI Yan-song(College of Chemical and Biological Engineering,Hechi University,Yizhou 546300,Guangxi,China)

机构地区：[1]河池学院化学与生物工程学院,广西宜州546300

出　　处：《有色金属（冶炼部分）》2020年第5期86-92,99,共8页Nonferrous Metals（Extractive Metallurgy)

基　　金：广西高校中青年教师基础能力提升项目(2018KY0497)。

摘　　要：以活性炭纤维、异丙醇铝为原料,通过溶胶—凝胶法制备载铝改性活性炭纤维电极(ACF-Al),通过单因素和正交试验研究其对模拟废水中Cr(Ⅵ)的电吸附性能;采用XRD、FTIR、SEM对电极材料进行表征;达到吸附平衡后对电极进行再生。试验结果表明,电吸附Cr(Ⅵ)适宜工艺条件为:模拟废水初始浓度40mg/L、pH=2.5、电极电位0.3V、极板间距6mm、ACF-Al电极板面积100cm^2,Cr(Ⅵ)吸附率接近100%,比开路条件下提高了26.25个百分点;电吸附过程更符合Langmuir等温线模型和准二级动力学方程;对ACF-Al电极进行4次循环再生处理后,其对Cr(Ⅵ)的吸附率仍保持在87%以上。表征结果显示,活性氧化铝被成功负载到活性炭纤维表面,提高了其导电性,增强了Cr(Ⅵ)向电极板的定向迁移性,并在表面羧基、羟基等官能团的作用下,使Cr(Ⅵ)得到有效去除。Aluminum modified activated carbon fiber electrode(ACF-Al)was prepared by sol-gel method applying activated carbon fiber and aluminum isopropoxide as raw materials.Electro-adsorption performance of Cr(Ⅵ)in simulated wastewater was studied by single factor and orthogonal experiments.Electrode materials were characterized by XRD,FTIR and SEM.After adsorption equilibrium was achieved,electrode was regenerated.The experimental results show that Cr(Ⅵ)adsorption rate is close to 100%,which is 26.25 point percent higher than that under open circuit condition,and suitable process conditions including initial concentration of simulated wastewater of 40 mg/L,pH value of 2.5,electrode potential of 0.3 V,polar plate spacing of 6 mm,and ACF-Al plate area of 100 cm^2.Electro-adsorption process fits well with Langmuir adsorption isotherm model and can be well described by Quasi-second-order kinetics equation.After four cycles of regeneration process on activated carbon fiber electrode,adsorption and removal rate of Cr(Ⅵ)remains 87% above.Characterization results show that activated alumina is successfully loaded on surface of activated carbon fiber,which improves its conductivity,enhances directional migration of Cr(Ⅵ)to the plate,and removes Cr(Ⅵ)effectively under action of carboxyl and hydroxyl groups on surface.

关 键 词：活性炭纤维 异丙醇铝 Cr(Ⅵ) 电吸附 

分 类 号：X705[环境科学与工程—环境工程]