不同形式EDTA功能化硅胶协同去除废水中的苯酚和Cr(Ⅵ)  

Collaborative removal of phenol and Cr(Ⅵ) from wastewater using silica gel material modified with EDTA in different forms

作　　者：崔芸芸 孙伟杰 陈斌[1] 郑岚[1] 李蓉[1] CUI Yunyun;SUN Weijie;CHEN Bin;ZHENG Lan;LI Rong(School of Chemical Engineering, Northwest University, Xi′an 710069, China)

机构地区：[1]西北大学化工学院,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2022年第1期106-114,共9页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(21376191);陕西省教育厅服务业地方特殊项目(14JF027);陕西省科学技术厅重点研究开发计划(2018GY-079);陕西省教育厅产业化培育项目(2013jc23)。

摘　　要：该研究以自制的乙二胺四乙酸(EDTA)功能化硅胶为原料,开发了一种高效去除废水中苯酚和Cr(Ⅵ)的工艺。制备和表征了2种不同形式的改性材料EDTA-Silica和EDTA-Fe^(2+)-Silicao,通过研究EDTA-Silica和EDTA-Fe^(2+)-Silica在单组分体系中与FENTON反应结合对苯酚的去除效果,证明了改性材料对促进FENTON反应的催化性能,可有效扩大反应的pH应用范围。同时,利用EDTA的强螯合性也可以有效地去除多余的FENTON试剂。考虑到苯酚工业废水中存在强氧化性Cr(Ⅵ),进一步研究了2种改性材料在双组分体系中同时去除苯酚和Cr(Ⅵ)的效果。苯酚与Cr(Ⅵ)之间存在正向协同作用,Cr(Ⅵ)的加入有利于苯酚的去除,且氧化还原反应前后的总Cr(Ⅵ)均能被材料有效吸附。结果表明,该材料具有催化和吸附金属离子的性能,可有效去除二元组分体系中的苯酚和Cr(Ⅵ),体系中残留金属离子的含量可满足环境排放要求。该研究为油漆、油墨、皮革、纺织工业等领域工业废水中苯酚和Cr(Ⅵ)的协同去除提供了新思路,研发的材料和工艺有着潜在的应用前景。In this study, an efficient process for synergistically removing phenol and Cr(Ⅵ) from wastewater was developed on the basis of home-made silica material modified with ethylenediaminetetraacetic acid(EDTA). Modified materials in two different forms, EDTA-Silica and EDTA-Fe^(2+)-Silica, were prepared and characterized. By investigating the phenol removal effect of EDTA-Silica and EDTA-Fe^(2+)-Silica combined with FENTON reaction in a one-component system, the catalytic property of the modified materials for promoting the FENTON reaction was demonstrated, the pH application range of the reaction could be effectively expanded. At the same time, excess FENTON reagents could also be effectively removed by using the strongly chelating property of EDTA. Taking into account the presence of strong oxidizing Cr(Ⅵ) in the phenol industrial wastewater, the simultaneous removal effect of phenol and Cr(Ⅵ) with two materials was further investigated in a two-component system. There was a positive synergy between phenol and Cr(Ⅵ), the addition of Cr(Ⅵ) was beneficial to the removal of phenol, while the total Cr(Ⅵ) before and after the redox reaction could be effectively adsorbed with the materials. The results showed that the materials exhibited the properties of catalyzing and adsorbing metal ions, by which phenol and Cr in the binary component system could be effectively removed, and the contents of residual metal ions in the system could meet the environmental emission requirements. The present work provides a new idea for synergistic removal of phenol and Cr(Ⅵ) in industrial wastewater from paint, ink, leather, textile industry fields, etc., the developing materials and process have potential application prospects.

关 键 词：EDTA-Silica 催化性能 强螯合性 协同去除 苯酚 Cr(Ⅵ) 

分 类 号：TQ424.3[化学工程] X592.1[环境科学与工程—环境工程]