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nZVI的类芬顿技术对污水中COD去除有着非常好的效果,但nZVI易团聚,易被水中溶解氧氧化,其循环利用能力及反应活性会降低[1-4],从而阻碍了nZVI在实际废水处理中的应用。多项研究表明,将nZVI进行改性,或将其负载到活性炭、矿物等具有吸附性能的材料上,可保证nZVI的固有特性并大幅增强其稳定性,弥补其易团聚的缺点[5-6]。张寒旭等[7]制备氧化石墨烯负载Fe3O4磁性催化剂类芬顿处理高浓度制药废水,Fe3O4颗粒没有出现明显的团聚现象,芳香类和富里酸类物质得到有效去除。MAHDIEH等[8]以壳聚糖包裹活性炭作为载体,制备ACC-CH-nZVI催化剂类芬顿处理黑素类废水,具有较高的去除率和经济价值。
伊利石改性已取得很多进展,大量研究表明,伊利石经适当的酸处理能提高其对阳离子吸附能力,为伊利石嫁接改性剂提供条件[9-12]。利用十六烷基三甲基溴化铵(CTAB)对伊利石进行改性,可以改变伊利石表面的吸附性能,使纳米零价铁与伊利石共混时牢固地附着在伊利石表面,从而有效降低纳米零价铁的团聚,增强复合材料的催化性能[13-16]。本研究采用液相还原法生成纳米零价铁,将其负载在经CTAB改性后的伊利石上,制备成类芬顿催化剂(It/CTAB@nZVI),并对其进行了表征。选取第3代头孢菌素类抗生素头孢哌酮(CPZ)作为目标物,研究了不同催化剂体系对CPZ的降解效能,考察了H2O2浓度、It/CTAB@nZVI投加量和初始pH对该类芬顿体系去除CPZ效果的影响,探究了It/CTAB@nZVI类芬顿体系降解废水中头孢哌酮的机理。
有机改性伊利石负载纳米零价铁类芬顿降解废水中头孢哌酮
Fenton-like degradation of cefoperazone in water by organic modified illite supported nano-zero-valent iron
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摘要: 为提高纳米零价铁(nZVI)在类芬顿体系中的催化效能,将液相还原法生成的纳米零价铁负载在经十六烷基三甲基溴化铵(CTAB)改性后的伊利石上,制备成类芬顿催化剂(It/CTAB@nZVI);采用XRD、SEM 及FTIR等方法对催化剂(It/CTAB@nZVI)的形貌和结构进行了表征,并以头孢哌酮(CPZ)为目标污染物,分别考察了H2O2浓度、催化剂投加量及pH对CPZ去除效果的影响,初步探究了It/CTAB@nZVI类芬顿体系降解废水中头孢哌酮的机理。结果表明,nZVI已成功地附着在改性后的伊利石表面,能有效防止纳米零价铁的团聚,提高了其在类芬顿体系中的催化效能;在H2O2浓度为3.2 mmol·L−1、It/CTAB@nZVI投加量为0.03 g·L−1、初始pH为2的条件下,CPZ的最大去除率可达99.4%。CPZ中β-内酰胺环结构被羟基自由破坏,先分解成具有苯环的中间产物,随后中间产物被进一步氧化分解为小分子的有机酸及醇类,最终被彻底降解为CO2、H2O、
${{\rm{NO}}_3^{-}} $ 、${{\rm{NH}}_4^{+}} $ 、${{\rm{SO}}_4^{2-}} $ 等无机物。以上研究结果可为类芬顿催化剂的制备和类芬顿技术处理难生物降解有机废水提供参考。-
关键词:
- 改性伊利石负载纳米零价铁 /
- 类芬顿 /
- 催化 /
- 头孢哌酮
Abstract: In order to improve the catalytic performance of nano-zero-valent iron (nZVI) in Fenton-like system, the nano-zero-valent iron (nZVI) generated by liquid phase reduction method was supported on illite modified by cetyltrimethyl ammonium bromide (CTAB), and a Fenton-like catalyst of It/CTAB@nZVI was prepared. The morphology and structure of It/CTAB@nZVI were characterized by XRD, SEM and FTIR. Cefoperazone (CPZ) was taken as the target pollutant, and the effects of H2O2 concentration, catalyst dosage and pH on CPZ removal were investigated. The mechanism of cefoperazone degradation in water by It/CTAB@nZVI - like Fenton system was preliminary studied. The results show that nZVI successfully adhered to the surface of modified illite, which could effectively reduce the agglomeration of nanometer zero-valent iron and improve its catalytic efficiency in Fenton-like system. Under the conditions of 3.2 mmol·L−1 H2O2 concentration, 0.03 g·L−1 It/CTAB@nZVI dosage and initial pH 2, the maximum CPZ removal rate could reach 99.4%. The β--lactam ring structure in CPZ was freely destroyed by hydroxyl group, it was decomposed into intermediate products with benzene ring first, and then these intermediate products were further decomposed into organic acids and alcohols with small molecules, and finally completely degraded into inorganic substances such as CO2, H2O,${\rm{NO}}_3^{-} $ ,${\rm{NH}}_4^{+} $ ,${\rm{SO}}_4^{2-} $ .This study can provide a reference for the preparation of Fenton-like catalysts and refractory organics treatment by Fenton-like technology.-
Key words:
- It/CTAB@nZVI /
- Fenton-Like /
- catalytic /
- cefoperazone
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