Ce掺杂海绵Fe/Cu-C复合微电解填料制备及己内酰胺废水降解研究  

Preparation of a Micro-electrolytic Filler of Ce-doped Sponge Fe/Cu-CComposite and the Degradation of Caprolactam Wastewater

作　　者：刘庆 罗佳 姜永晴 李桂菊 LIU Qing;LUO Jia;JIANG Yong-qing;LI Gui-ju(College of Marine and Environmental Sciences,Tianjin University of Science and Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学海洋与环境学院,中国天津300457

出　　处：《湖南师范大学自然科学学报》2024年第1期16-24,共9页Journal of Natural Science of Hunan Normal University

基　　金：国家自然科学基金面上项目(22276135)。

摘　　要：己内酰胺废水COD高,可生化性较差。为了提高微电解降解己内酰胺的效率,制备掺杂铈的复合微电解填料,并对其使用条件、降解效果和作用机理进行研究。复合微电解填料的制备方法为利用化学置换法向海绵铁(s-Fe)表面负载铜,形成的双金属还原颗粒与活性炭、碳酸锰、氧化铈等组分混合,随后高温焙烧。使用BET,SEM及XRD等方法,分析不同组分配比填料的物理化学性质,探究各组分所发挥的作用及其机理。研究结果表明,铈掺杂的复合微电解填料对己内酰胺的降解效果显著提升。在双金属颗粒(s-Fe/Cu)、碳酸锰、活性炭按照m(s-Fe)∶m(Cu)∶m(Mn)∶m(C)为15∶5∶1∶6.3、铈含量为9%、膨润土含量为30%的最佳制备条件下,复合微电解填料对己内酰胺废水的降解率达到74.68%,COD的去除率达到90.43%。与市售填料相比,自制填料对己内酰胺废水的去除率比市售填料高55.65%,B/C由原水的0.25提高到0.81,高于市售填料0.43,可生化性显著提高。XPS分析和淬灭实验表明,该填料通过微电解反应过程产生·OH,·O-2和1O2三种自由基团,促进了有机物的降解。Caprolactam wastewater has high COD and poor biochemistry.To increase the micro-electrolytic degradation efficiency of caprolactam,we prepared a micro-electrolytic filler of Ce-doped composite and investigated its degradation effect and mechanism of action toward caprolactam wastewater.The chemical replacement method was utilized to load Cu on the surface of sponge Fe(s-Fe)to form bimetallic reduction particles,which were subsequently mixed with activated carbon,MnCO 3,CeO 2,and other components,followed by high-temperature calcination to produce the electrolytic filler.By means of BET,SEM and XRD characterizations,we analyzed the physicochemical properties of fillers obtained with different component ratios and explored the role of each component and the corresponding mechanism.Results show that the micro-electrolytic filler of Ce-doped composite significantly enhances the degradation of caprolactam.Under the optimum component ratio for preparing s-Fe/Cu(i.e.,activated carbon,manganese carbonate with a s-Fe∶Cu∶Mn∶C ratio of 15∶5∶1∶6.3,a cerium content of 9%and a bentonite content of 30%),the degradation rate of caprolactam wastewater by using the micro-electrolytic filler reaches 74.68%,and the removal rate of COD reaches 90.43%.Compared with a commercial filler,the removal rate of caprolactam wastewater by our filler is 55.65%higher than that by the commercial filler,and the B/C increases from 0.25 to 0.81,higher than 0.43 by the commercial filler,alongside the biodegradability being significantly improved.XPS analysis and quenching experiments show that the filler produces three free groups including·OH,·O-2 and 1O 2,which promote the degradation of organic substance.

关 键 词：双金属组分 微电解 己内酰胺 CEO2 

分 类 号：TB33[一般工业技术—材料科学与工程] X703[环境科学与工程—环境工程]