改性粉煤灰基NaX沸石对对苯醌的吸附研究  

Adsorption Properties of NaX Zeolite Derived from Modified Fly Ash for P-benzoquinone

作　　者：蒋忠利 陈晓辉 吕逸杰 张世文[2,3] 徐鹏峰 蒋琪雅 任雪 葛建华[2,3] JIANG Zhongli;CHENG Xiaohui;ZHANG Shiwen;XU Pengfeng;JIANG Qiya;REN Xue;GE Jianhua(Resource and Environmental Protection Department,Huaihe Energy Group Corporation,Huainan Anhui 232001,China;School of Earth and Environment,Anhui University of Science and Technology,Huainan Anhui 232001,China;Laboratory of Comprehensive Utilization of Water and Soil Resources and Ecological Protection Engineering in High Groundwater Level Mining Area of Anhui Province,Anhui University of Science and Technology,Huainan Anhui 232001,China;Huahai Energy Health Industry Group Co.,Ltd.,Huainan Anhui 232001,China)

机构地区：[1]淮河能源集团公司资源环保部,安徽淮南232001 [2]安徽理工大学地球与环境学院,安徽淮南232001 [3]安徽理工大学安徽省高潜水位矿区水土资源综合利用与生态保护工程实验室,安徽淮南232001 [4]淮河能源健康产业集团有限责任公司,安徽淮南232001

出　　处：《安徽理工大学学报(自然科学版)》2024年第6期46-55,共10页Journal of Anhui University of Science and Technology:Natural Science

基　　金：采煤地表沉陷区水面种植关键技术及模式研究与示范(No.HX2024012395);安徽省高潜水位矿区水土资源综合利用与生态保护工程实验室开放课题(2022-WSREPMA-03);安徽省高校优秀人才支持计划项目(gxyq2020012);安徽省自然科学基金(1808085ME139);淮北矿业集团科技研发项目(2022-113)。

摘　　要：目的为了探究粉煤灰基NaX沸石对对苯醌的吸附性能和吸附机理。方法选用淮北市某矿区粉煤灰为原料,采用碱熔融-水热法合成NaX沸石,再利用表面活性剂十六烷基三甲基溴化铵和Fe^(3+)对合成后的NaX沸石进行改性,并通过吸附动力学、吸附等温线、吸附热力学实验以及BET、XRD、SEM、FTIR等表征方法进行分析。结果实验表明,合成后的NaX沸石及两种方法改性后的NaX沸石比表面积均大于原粉煤灰,分别为原粉煤灰的71、54和4倍;沸石对对苯醌的吸附量由大到小依次为表面活性剂改性的沸石>Fe^(3+)改性的沸石>粉煤灰合成的沸石>原始粉煤灰,表明沸石在经过改性后吸附性能均有所提升,尤其是表面活性剂改性的沸石;吸附过程为自发放热和熵减过程,动力学数据更符合准一级动力学模型(R^(2)≥0.987),表明吸附更符合以物理吸附为主的孔道扩散,主要受范德华力等分子间作用力的影响,吸附等温线更符合Freundlich等温线模型(R^(2)≥0.951),表明吸附是在非均匀表面上的多层吸附。结论以期为利用煤基固废处理有机废水提供基础资料和新的思路。Objective To investigate the adsorption performance and mechanism of fly ash-based NaX zeolite for the adsorption of p-benzoquinone.Methods NaX zeolite was synthesized with the fly ash from a mining area in Huaibei City as raw material by using the alkali melting-hydrothermal method,and then modified by surfactant hexadecyltrimethylammonium bromide and Fe^(3+).The samples were analyzed with the use of the adsorption kinetics,adsorption isothermand adsorption thermodynamics experiment,as well as BET,XRD,SEM,FTIR and other characterization methods.Results It was found that the specific surface areas of the synthesized NaX zeolite and the NaX zeolite modified by the two former methods were 71,54 and 4 times respectively,larger than that of the original fly ash.The order of the adsorption capacity of zeolites for benzoquinone was like this,surfactant modified zeolite>Fe^(3+)modified zeolite>zeolite synthesized from fly ash>fly ash,indicating that the adsorption performance of zeolites were improved after modification,especially for surfactant modified zeolite.The adsorption process involved self heating and entropy reduction.The kinetic data was more consistent with the quasi first order kinetic model(R^(2)≥0.987),indicating that the adsorption was more in line with the pore diffusion dominated by physical adsorption,mainly influenced by intermolecular forces such as the Van der Waals forces.The adsorption isotherm was more in line with the Freundlich isotherm model(R^(2)≥0.951),indicating that the adsorption was a multi-layer adsorption on a non-uniform surface.Conclusion The research provides the basic information and new ideas to utilizing coal based solid waste to treat organic wastewater.

关 键 词：粉煤灰 NaX沸石 对苯醌 吸附性能 

分 类 号：X752[环境科学与工程—环境工程]