【摘要】 研究了赤泥对模拟废水中镉离子的吸附作用,以及反应时间、溶液中镉离子初始浓度、赤泥的掺加量、温度和pH值等因素对吸附的影响.结果表明,赤泥对镉离子有很好的吸附作用,对废水中镉离子的去除率最大可达99.4%.溶液中镉离子初始浓度不但影响吸附率而且影响吸附量,最大吸附量可达5.34 mg/g.在碱性环境中,该反应是吸附和沉淀共同作用的结果.该吸附以化学吸附为主,符合二级动力学方程和Freundlich吸附等温式.更多还原

【Abstract】 The adsorption of red mud to the cadmium ion in the simulative waste water is studied.The influence factors on adsorption such as contact time,red mud content in solution,initial cadmium ion content in solution,temperature and the value of pH are tested.The results show that red mud exhibits good adsorption capability to cadmium ion,the maximum adsorption ratio would be 99.4%.The initial cadmium ion content influences both the adsorption ratio and the adsorption quantity.The maximum adsorption quantity would be 5.34 mg/g.The reaction is the result of adsorption and deposition together in strongly alkalescent condition.The adsorption reaction is chemistry adsorption and follows the second grade dynamics equation and the Freudlich equation.更多还原