邢增孟,汤兵,陈烜,付丰连,张姿,卢志刚.纳米磁性颗粒Fe3O4用于吸附水相中酸性红73及其机理研究[J].环境科学学报,2014,34(9):2246-2255
纳米磁性颗粒Fe3O4用于吸附水相中酸性红73及其机理研究
- Adsorption mechanism of acid red 73 onto magnetic nanoparticles Fe3O4 from aqueous phase
- 基金项目：广州市科技攻关项目（No.2011J4300069）
- 邢增孟
- 广东工业大学, 环境科学与工程学院, 广州 510006
- 汤兵
- 广东工业大学, 环境科学与工程学院, 广州 510006
- 陈烜
- 广东工业大学, 环境科学与工程学院, 广州 510006
- 付丰连
- 广东工业大学, 环境科学与工程学院, 广州 510006
- 张姿
- 广东工业大学, 环境科学与工程学院, 广州 510006
- 卢志刚
- 广东工业大学, 环境科学与工程学院, 广州 510006
- 摘要：利用纳米磁性颗粒处理含酸性红73废水以利于进一步降低其色度.实验以酸洗废液制备的纳米磁粉Fe3O4作为吸附剂，并通过单因素实验和吸附动力学及热力学的分析探讨其对酸性红73的表面吸附的吸附机理.结果表明：纳米磁粉Fe3O4对酸性红73的表面吸附符合假二级动力学方程，其反应活化能为49.05 kJ·mol-1.磁粉对酸性红73的吸附是快速的表面物理吸附，其表面吸附行为符合Langmuir等温吸附式，是放热和熵减的自发过程.在温度T为303 K的条件下，20 min内的饱和吸附量能可达到40.1 mg·g-1.因此，用纳米磁粉Fe3O4吸附处理含偶氮染料废水，吸附平衡可在很短的时间内实现.
- Abstract：The present investigation focused on treating wastewater containing Acid Red 73 (AR73) with nano-magnetic particle for further decolorization. In the experiments, nano-magnetic Fe3O4 particles prepared from pickling spent liquor were used as an adsorbent, and adsorption mechanism of AR73 on the surface of Fe3O4 was explored with the methods of single-factor experiments and adsorption-dynamic analysis. Results indicated that the adsorption of AR73 on the surface of nano-magnetic particles accorded well with the pseudo-second order kinetic equation with the reactive activation energy achieving 49.05 kJ·mol-1. The adsorption of AR73 was a fast physical adsorption on the surface. Their behavior accorded with the Langmuir isothermal, and was a spontaneous, exothermic, and entropy-decreasing process. Under 303 K, the saturated adsorption capacity attained 40.1 mg·g-1 within 20 mins. Therefore, in terms of treating waste water containing azo dyes, the adsorption equilibrium could be achieved in a very short time.
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