电解锰渣基沸石对锰离子的吸附性能研究

Adsorption of manganese ion by zeolite synthesized from electrolytic manganese residue

电解锰渣是电解锰行业露天堆存的大宗固体废弃物,在堆存过程中将产生毒性污染物锰离子。为有效利用电解锰渣的同时消除锰离子对环境的危害,以电解锰渣为原料采用微波碱熔活化法制备沸石,并用于吸附锰离子。考察了溶液初始锰离子质量浓度、溶液pH、吸附温度和吸附时间等因素对锰离子吸附效果的影响。结果表明:在溶液初始锰离子质量浓度为500 mg/L、溶液pH为6、吸附时间为2 h、吸附温度为50℃条件下,电解锰渣基沸石对锰离子具有较好的吸附能力,最大吸附量高达79.18 mg/g。探究了电解锰渣基沸石对锰离子的吸附行为。结果表明,锰离子在沸石表面的吸附符合准二级动力学模型,Langmuir等温吸附模型比Freundlich模型更适合于描述电解锰渣基沸石去除锰离子的等温吸附过程。电解锰渣基沸石循环使用性能良好,在重金属废水处理方面具有潜在的应用前景。

Electrolytic manganese residue(EMR) is a large amount of solid waste deposited in the open air,during the stock- piling process,toxic pollutant Mn2+ will be released. In order to effectively utilize EMR and eliminate the environmental ha- zards of Mn2+,zeolite was prepared by microwave heating and alkali fusion method using electrolytic manganese residue as raw material,and it was used to adsorb Mn2+.Then,the factors of initial Mn2+ concentration,solution pH,adsorption tempera- ture and adsorption time on the adsorption effects of Mn2+ were discussed.The results showed that synthetic zeolite had a bet- ter performance for Mn2+ removal and the maximum adsorption quantity for Mn2+ was 79.18 mg/g under the conditons such as initial Mn2+ concentration of 500 mg/L,solution pH of 6,adsorption time of 2 h and adsorption temperature of 50 ℃.The ad- sorption behavior of zeolite from electrolytic manganese residue on manganese ions was investigated.Results showed,the ad- sorption of Mn2+ on the surface of zeolite fitted well to the pseudo second-order equation,the Langmuir equation model was found to be more suitable to explicate the experimental equilibrium isotherm results than Freundlich equation model.This study revealed that EMR-based zeolite had a good recycling performance and potential application prospect in heavy metal wastewater treatment.