改性电炉钢渣-多元LDHs对亚甲基蓝染的料脱色性能  

Decolorization performance of methylene blue dye by the multi-LDHs of modified electric furnace steel slag

作　　者：吕鹏翼[1] 马文凯 魏渤惠 张峻搏 崔建升[1] 罗晓[1] LV Pengyi;MA Wenkai;WEI Bohui;ZHANG Junbo;CUI Jiansheng;LUO Xiao(Pollution Prevention Biotechnology Laboratory of Hebei Province,School of Environmental Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;School of Civil Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;Shijiazhuang Branch of Tangshan Planning and Architectural Design&Research Institute,Shijiazhuang 050018,China)

机构地区：[1]河北科技大学环境科学与工程学院,河北省污染防治生物技术实验室,石家庄050018 [2]河北科技大学建筑工程学院,石家庄050018 [3]唐山市规划建筑设计研究院石家庄分院,石家庄050018

出　　处：《环境工程学报》2022年第3期915-925,共11页Chinese Journal of Environmental Engineering

基　　金：河北省高等学校科学技术研究项目(ZD2017233);河北省重点研发项目(21373904D);河北科技大学引进人才科研启动基金(1181374)。

摘　　要：研究了电炉钢渣改性材料——多元层状双金属氢氧化物(multivariate layered double hydroxide,多元LDHs)对亚甲基蓝染料的脱色性能。考察了亚甲基蓝染料初始质量浓度、吸附时间、吸附温度、pH和吸附剂投加量对吸附亚甲基蓝效果的影响。结果表明,当亚甲基蓝质量浓度为10 mg·L^(-1)、pH为5.0、多元LDHs投加量为40 g·L^(-1)时,多元LDHs对亚甲基蓝的吸附效果最佳,45 min内的去除率可达98.00%,120 min内基本完全去除。X射线衍射(XRD)表征结果表明,利用电炉原钢渣成功制备了多元LDHs;BET测试结果表明,多元LDHs的比表面积及孔容显著优于原钢渣。采用扫描电镜(SEM)和傅里叶变换红外光谱仪(FT-IR)技术对多元LDHs吸附亚甲基蓝前后形态特征以及关键官能团信息进行系统表征,结果表明,亚甲基蓝已成功吸附到多元LDHs上。吸附动力学研究表明,多元LDHs对亚甲基蓝的吸附过程中膜扩散和颗粒内扩散同时发生;吸附等温线拟合结果表明,该吸附过程符合Langmuir吸附等温模型;由热力学参数可知,多元LDHs对亚甲基蓝的去除为自发进行的、放热、以化学吸附为主的过程。以上研究结果可为电炉钢渣的资源化及其在亚甲基蓝废水处理中的应用提供参考。In this study,the multivariate layered double hydroxide(multi-LDHs)material was prepared by modifying the electric furnace steel slag,and its decolorization properties of methylene blue dye was investigated.The effects of initial dye concentration,adsorption time,adsorption temperature,pH and multiLDHs dosage on the adsorption of methylene blue solution onto multi-LDHs were investigated.The results indicated that under the optimal operating parameters of 10 mg·L^(-1) methylene blue,pH 5.0 and multi-LDHs dosage of 40 g·L^(-1),the maximum decolorization efficiency could reach 98% within 45 min and the dye was almost completely removed within 120 min.X-ray diffraction(XRD)results showed that the multi-LDHs have been successfully prepared from raw steel slag of electric furnace.BET test results demonstrated that the specific surface area and pore volume of multi-LDHs were significantly better than raw steel slag.The morphological characteristics and key functional groups of multi-LDHs pre-and post-adsorption of methylene blue were systematically characterized by scanning electron microscope(SEM)and Fourier transform infrared spectrometer(FT-IR),the results showed that methylene blue was successfully adsorbed on multi-LDHs.The adsorption kinetics confirmed that the membrane diffusion and intra-particle diffusion occurred simultaneously during the adsorption process of methylene blue by multi-LDHs.The fitting results of adsorption isotherm showed that the adsorption process conformed to the Langmuir isotherm model.The thermodynamic parameters indicated that methylene blue removal by multi-LDHs was spontaneous,exothermic and dominated by chemical adsorption.The above results can provide a reference for resource utilization of electric furnace slag and its application in methylene blue dye wastewater treatment.

关 键 词：电炉钢渣 多元LDHs 亚甲基蓝 固废资源化 

分 类 号：X703.1[环境科学与工程—环境工程]