高炉渣对废水中Cu^2+的吸附率和吸附行为

Adsorption Rate and Adsorption Behavior of Cu^2+in Wastewater by Blast Furnace Slag

工业固废高炉渣对废水中的重金属离子表现出了较好的吸附能力,为了深入了解高炉渣对Cu^2+的吸附效果,在研究高炉渣的用量、pH、吸附时间和温度对废水中Cu^2+吸附率的影响规律基础上,选取四因素三水平正交设计实验,获得吸附Cu^2+的最佳反应条件,并利用吸附等温模型和吸附动力学探讨高炉渣对Cu^2+的吸附行为.结果表明:高炉渣表面的吸附位点、较大的比表面积以及发达的孔隙结构能够促进Cu^2+的吸附.在高炉渣用量为0.5 g、pH为9、吸附时间为360 min、温度为65℃时,去除率可达99.93%,吸附后溶液中Cu^2+的残余质量浓度小于1 mg/L,达到了国家排放标准.高炉渣对Cu^2+的吸附更符合Langmuir吸附等温模型,吸附动力学过程更符合拟二级动力学方程.

The industrial solid waste blast furnace slag shows a good adsorption capacity for heavy metal ions in wastewater.To understand the adsorption effect of blast furnace slag on Cu^2+,based on the influence of the consumption of industrial solid waste blast furnace slag,pH value,adsorption time and temperature on the adsorption rate of Cu^2+in wastewater,four factors and three levels orthogonal designed experiments were selected.The optimum reaction conditions for Cu^2+adsorption were obtained,and the adsorption isotherm model and adsorption kinetics were used to study the adsorption behavior of Cu^2+on blast furnace slag.Results show that the adsorption sites,large specific surface area and developed pore structure on the surface of blast furnace slag can promote the adsorption of Cu^2+.The removal rate can reach 99.93%when the slag consumption is 0.5 g,the pH value is 9,the adsorption time is 360 min,and the temperature is 65℃.The residual mass concentration of Cu^2+in the adsorbed solution is less than 1 mg/L,which meets the national emission standard.The adsorption isotherm model of blast furnace slag for Cu^2+is more in line with Langmuir adsorption isotherm model.The adsorption of Cu^2+by blast furnace slag is more in accordance with pseudo-second-order kinetic equation.