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Fe0/海藻酸钙微球还原-Fenton氧化协同降解酸性红B
摘要点击 1316  全文点击 545  投稿时间:2018-07-18  修订日期:2018-08-03
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中文关键词  Fe0  海藻酸钙  还原  Fenton氧化  酸性红B(ARB)
英文关键词  zero-valent iron  calcium alginate  reduction  Fenton oxidation  acid red B (ARB)
作者单位E-mail
张环 天津工业大学环境与化学工程学院, 天津 300387
天津工业大学省部共建分离膜与膜过程国家重点实验室, 天津 300387
天津工业大学天津市水质安全评价与保障技术工程中心, 天津 300387 
zhanghuan@tjpu.edu.cn 
李爽爽 天津工业大学省部共建分离膜与膜过程国家重点实验室, 天津 300387  
魏俊富 天津工业大学环境与化学工程学院, 天津 300387
天津工业大学省部共建分离膜与膜过程国家重点实验室, 天津 300387
天津工业大学天津市水质安全评价与保障技术工程中心, 天津 300387 
 
傅敏 天津工业大学省部共建分离膜与膜过程国家重点实验室, 天津 300387  
李雪曦 天津工业大学省部共建分离膜与膜过程国家重点实验室, 天津 300387  
丁琦 天津工业大学省部共建分离膜与膜过程国家重点实验室, 天津 300387  
白蓉 天津工业大学省部共建分离膜与膜过程国家重点实验室, 天津 300387  
中文摘要
      以海藻酸钠为固定基质制备了Fe0/海藻酸钙微球,探讨基于Fe0/海藻酸钙微球对染料还原-Fenton氧化协同降解转化的特性及机制.通过FT-IR、SEM、BET、XPS等方法对材料进行了表征,考察了不同还原氧化体系、Fe0/海藻酸钙微球投加量、溶液pH等因素对酸性红B(ARB)降解效果的影响,以及Fe0/海藻酸钙微球还原-氧化过程中Fe0的稳定性和海藻酸钙微球重复催化性能.结果表明,Fe0/海藻酸钙微球的多级孔道结构对染料有一定的吸附作用.在Fe0/海藻酸钙微球还原染料阶段中,Fe0投加量为0.24g·L-1,溶液初始pH为2.96时,180 min后ARB的色度去除率可达到96.8%.在后续的Fenton氧化阶段,加入10.75mmol·L-1H2O2后,ARB色度去除率达到99%,矿化程度提高至64.7%.与Fe0/海藻酸钙微球还原体系和Fe3+/海藻酸钙微球Fenton氧化体系相比,Fe0/海藻酸钙微球还原-Fenton氧化协同体系能够实现ARB的有效脱色和矿化.由于海藻酸钙中羧基对Fe2+/Fe3+的配位作用,Fe离子从微球中转移到溶液中的量为微球中总铁量的3.9%左右.由于Fe离子能够较好地固定在海藻酸钙微球中,在pH较高条件下,减少了Fe氢氧化物的生成,Fenton反应能够在较宽pH范围内进行,含有Fe2+/Fe3+的海藻酸钙微球表现出较好的重复催化氧化性能.因此,Fe0/海藻酸钙微球还原-Fenton氧化协同技术为染料废水的处理提供了一种较好的解决方案.
英文摘要
      The zero-valent iron (ZVI) immobilized in an alginate microsphere was prepared by using sodium alginate as a support material. The characteristics of the Fe0/alginate microsphere was characterized by FT-IR, SEM, BET, and XPS. The SEM and BET analyses showed that the Fe0/alginate microsphere had a multilevel porous structure and could adsorb ARB. Combined with Fe0 reduction and Fe3+/Fe2+ catalytic oxidation, the mineralization of ARB could be effectively realized. The ARB in the solution was discolored rapidly by the reduction of Fe0/alginate microsphere and then oxidized efficiently by the subsequent Fenton reaction. The discoloration rate of ARB in the reduction stage was 96.8%, with an Fe0/alginate microsphere dosage of 0.24g·L-1 and pH of 2.96 after reaction time of 180 min. ARB was reduced to organics of lower molecular weight due to the degradation of azo groups by Fe0. In the subsequent Fenton oxidation stage, the mineralization degree of ARB increased to 64.7% after the addition of 10.75 mmol·L-1 H2O2. The influence of the Fe0/alginate microsphere dosage, pH, reusability of the Fe0/alginate microsphere, and the stability of iron ions in the alginate microsphere were investigated. Due to the coordination of Fe3+/Fe2+ ions with -COO--in the alginate, the iron ion in the solution was 3.9% of the total iron content in the microsphere. Iron ions could be well immobilized in calcium alginate microspheres, so the iron hydroxides were generated in lower amounts. The Fenton reaction can be conducted in a wide range of pH. The Fe2+/Fe3+immobilized in the alginate microsphere demonstrated good catalytic performance after it was reused four times. Therefore, the synergy of reduction and Fenton oxidation by the Fe0/alginate microsphere was a better strategy for dye degradation.

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