褐煤腐植酸复合菌剂对镉离子的吸附效果和机理的初步研究  

Preliminary Study on Adsorption Effect and Mechanism of Cd^(2+)by Composite Microbial Inoculant with Lignite Humic Acids

作　　者：裴启航 叶尔阿森·吐地拜 茅文庆 关家栋 陈林勇 周志林 何环[1] Pei Qihang;Yerasen Tudiba;Mao Wenqing;Guan Jiadong;Chen Linyong;Zhou Zhilin;He Huan(Key Laboratory of Coal Processing and Effi cient and Clean Utilization of Ministry of Education,School of Chemical Engineering,China University of Mining and Technology,Xuzhou,221116;State Key Laboratory of Coal and Coal-bed Methane Simultaneous Extraction,Jincheng,048012;Xuzhou Academy of Agricultural Sciences,Xuzhou,221131)

机构地区：[1]中国矿业大学化工学院煤炭加工与高效洁净利用教育部重点实验室,徐州221116 [2]煤与煤层气国家重点实验室,晋城048012 [3]徐州农业科学研究院,徐州221131

出　　处：《腐植酸》2024年第4期23-30,共8页Humic Acid

基　　金：国家自然科学基金项目(项目编号42172187);徐州市重点研发计划项目(项目编号2021ZDPY0210)。

摘　　要：以褐煤腐植酸复合菌剂和镉离子(Cd^(2+))为研究对象,进行复合菌剂吸附Cd^(2+)试验。研究了复合菌剂添加量和pH对Cd^(2+)吸附的影响,通过对吸附Cd^(2+)前后复合菌剂的形貌表征及吸附动力学过程分析,初步探究了复合菌剂对Cd^(2+)的吸附机理。研究结果表明,复合菌剂可有效吸附Cd^(2+),菌剂添加量和pH对Cd^(2+)吸附效果有显著影响,当复合菌剂添加量为12 g/L、pH=5时,对Cd^(2+)的吸附效果最好,最大吸附容量为3.942 mg/g,吸附率达到94.62%。复合菌剂对Cd^(2+)吸附动力学符合准二级动力学方程,为单分子层吸附。复合菌剂吸附Cd^(2+)后表面层状结构消失,表面更加粗糙凹凸不平,结构发生改变,且吸附后表面Cd元素质量百分比高于褐煤,说明褐煤复合菌剂对于Cd^(2+)的吸附能力得到了提升。The composite microbial inoculant with lignite humic acids and cadmium ions(Cd^(2+))as research objects,Cd^(2+)adsorption was performed.The influence of the composite microbial inoculant dosage and pH level was examined.Additionally,the adsorption mechanism of the composite microbial inoculant on Cd^(2+)was preliminarily explored through a comprehensive analysis of its morphology and adsorption kinetics before and after the adsorption process.The results indicated that the composite microbial inoculant could effectively adsorb Cd^(2+),The dosage and pH had significant influence on the adsorption effect of Cd^(2+).The optimal conditions for adsorption were found to be a composite microbial inoculant dosage of 12 g/L and a pH of 5.Under these conditions,the maximum adsorption capacity of Cd^(2+)reached 3.942 mg/g,with an adsorption rate of 94.62%.Furthermore,the adsorption kinetics of the composite microbial inoculant followed a quasi-second-order kinetic equation,suggesting a single molecular layer adsorption mechanism.The morphological analysis revealed that the surface layer structure of the composite microbial inoculant disappeared upon adsorption,resulting in a rougher and more uneven surface.Furthermore,the components of Cd on the absorbed surface were higher than the raw lignite,which indicated the capability of Cd^(2+)by composite microbial inoculant with lignite humic acids was improved.

关 键 词：褐煤 腐植酸 复合菌剂 镉离子 吸附动力学 

分 类 号：TQ314.1[化学工程—高聚物工业] TQ028.15