不同变质程度超微煤粉对重金属离子的吸附性能  

Adsorption of heavy metal ions by different ultrafine coal powders

作　　者：刘转年[1,2] 王艺[1] 陈龙[1] 游历 张媛媛[1] 

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054 [2]陕西省环境保护水土污染与修复重点实验室(长安大学),陕西西安710064

出　　处：《化工进展》2015年第8期3173-3178,共6页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51278418);陕西省工业攻关项目(2013K11-10);榆林市产学研合作项目;中央高校基本科研业务费专项资金项目

摘　　要：重金属离子由于具有毒性、难以生物降解且可在生物体内累积,严重威胁人类的身体健康。吸附是去除重金属离子的一种可行有效的方法。本文选择褐煤、烟煤、无烟煤3种变质程度不同的煤种,通过高能球磨获得超微煤粉。研究了3种超微煤粉对水溶液中Ni2+和Cr6+的吸附动力学与热力学以及投加量与p H值对吸附效果的影响。结果表明3种煤粉对Ni2+、Cr6+的吸附量均随时间的增加而增加,并且Ni2+的处理效果明显好于Cr6+,在180min时褐煤、无烟煤与烟煤对Ni2+、Cr6+的吸附量分别为3.906mg/g、3.582mg/g、2.983mg/g和1.953mg/g、1.774mg/g、0.487mg/g。3种煤粉对两种重金属离子的吸附均符合二级吸附动力学和Freundlich等温式,随着投加量与p H值的增加,去除效果增加,在相同条件下,褐煤的吸附效果优于烟煤与无烟煤。Heavy metal ions threaten human health seriously for its toxicity, difficulty of biodegradation and accumulation in organisms. Adsorption is a feasible and effective method for the removal of heavy metal ions. In this paper, three different metamorphic grade coals of lignite, bituminite and anthracite were used to obtain the ultrafine coal powders through high energy ball milling. Adsorption mechanism and effect of dosage and pH on Ni2＋ and Cr6＋ adsorption were studied. Adsorption values of Ni2＋ and Cr6＋ on three ultrafine coals all increased with time and adsorption of Ni2＋ was better than Cr6＋. The adsorption values of lignite, anthracite and bituminite for Ni2＋ and Cr6＋ were 3.906mg/g, 3.582mg/g, 2.983mg/g and 1.953mg/g, 1.774mg/g, 0.487mg/g, respectively. The adsorption kinetic data followed the pseudo second-order model and equilibrium data fitted the Freundlich equation well. With increasing dosage and pH, removal rates of Ni2＋ and Cr6＋ all increased gradually, but under the same conditions, adsorption effect of lignite was obviously better than bituminite and anthracite.

关 键 词：超微煤粉 变质程度 吸附 重金属 

分 类 号：X78[环境科学与工程—环境工程]