引用本文:张晓琳,Teza MWAMULIMA,王勇梅,宋少先,谷庆宝,彭昌盛,等.粉煤灰基多孔材料负载纳米铁的制备及其对龙胆紫的去除效果[J].环境科学研究,2017,30(8):1295-1302.
ZHANG Xiaolin,Teza MWAMULIMA,WANG Yongmei,SONG Shaoxian,GU Qingbao,PENG Changsheng,et al.Preparation of Porous Pellets Based on Nano-Zero Valent Iron-Enhanced Fly Ash and Their Application for Crystal Violet Removal[J].Reserrch of Environmental Science,2017,30(8):1295-1302.]
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粉煤灰基多孔材料负载纳米铁的制备及其对龙胆紫的去除效果
张晓琳1, Teza MWAMULIMA1, 王勇梅1, 宋少先2, 谷庆宝3, 彭昌盛1
1.中国海洋大学环境科学与工程学院, 海洋环境与生态教育部重点实验室, 山东 青岛 266100 ;2.武汉理工大学资源与环境工程学院, 湖北 武汉 430070 ;3.中国环境科学研究院, 北京 100012
摘要:
为制备新型可再生吸附反应材料,以工业废弃物粉煤灰、棕榈壳等为主要原料,烧结制备FAP(粉煤灰基多孔材料),并以FAP为载体负载纳米零价铁,制备FAP/nZVI(粉煤灰基纳米零价铁多孔材料),以散失率、龙胆紫去除率、纳米零价铁负载量等为指标,确定FAP及FAP/nZVI的最佳制备条件,并考察二者对染料龙胆紫的去除特性. 结果表明:①FAP的最佳制备条件为m(粉煤灰)∶m(膨润土)∶m(棕榈壳)=190∶95∶15,升温速率10 ℃/min,烧结温度800 ℃,保温时间30 min.②FAP/nZVI最佳制备条件为m(Fe)/m(FAP)1∶3,振荡时间1 h,选用抗坏血酸为稳定剂,过程中无需使用惰性气体;SEM结果表明纳米零价铁被成功负载于FAP上.③FAP/nZVI对200 mg/L龙胆紫的去除率为94.8%,FAP同条件下的去除率仅为26.2%,FAP/nZVI对龙胆紫的去除同时存在物理吸附和化学还原作用,并且纳米零价铁的还原占主导作用.④FAP/nZVI再生10次后30 min内对100 mg/L龙胆紫去除率高达97.6%. 研究显示,FAP可将纳米零价铁氧化产物Fe2+固定在表面,经还原后可再生为纳米零价铁,具有良好的再生性能.
关键词:  粉煤灰  纳米零价铁  多孔材料  龙胆紫
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基金项目:环境基准与风险评估国家重点实验室开放课题(SKLECRA2013FP12);山东省重点研发计划项(2016GSF115040)
Preparation of Porous Pellets Based on Nano-Zero Valent Iron-Enhanced Fly Ash and Their Application for Crystal Violet Removal
ZHANG Xiaolin1, Teza MWAMULIMA1, WANG Yongmei1, SONG Shaoxian2, GU Qingbao3, PENG Changsheng1
1.Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China ;2.College of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430000, China ;3.Chinese Research Academy of Environmental Science, Beijing 100012, China
Abstract:
Abstract: Fly ash-based porous pellets (FAP) were prepared using fly ash, palm kernel shells and bentonite. The FAP was later loaded with nano-zero valent iron (nZVI) using wet chemical reduction under atmospheric conditions with ascorbic acid as stabilizer. The removal rate of crystal violet (CV), scatter ratio and the weight of loaded iron were used to determine the best conditions for preparing FAP and FAP/nZVI. The adsorption behaviors of FAP and FAP/nZVI were investigated. The results showed that:(1) The optimum conditions for FAP preparation were:mass ratio of fly ash, bentonite and oil palm shell of 190∶95∶15, sintering temperature 800 ℃ and heating rate 10 ℃/min sintering time 30 min. (2) The optimum conditions of FAP/nZVI preparation were:iron/FAP mass ratio 1∶3 and shaking time 1 h; SEM analysis showed that the nZVI was loaded on the FAP successfully. (3) The removal rate of 200 mg/L CV using FAP/nZVI was up to 94.8%, while using FAP was only 26.2% under the same conditions. FAP/nZVI removal mechanisms included physical adsorption by FAP and chemical reduction by nZVI as the dominant mechanisms. (4) FAP can keep the oxidation product of nZVI(Fe2+) in the surface, which can be reduced to nZVI again. Regeneration studies using 100 mg/L CV showed that after ten cycles, the removal rate was up to 97.6% within 30 minutes.
Key words:  fly ash  nano zero-valent iron  porous adsorbent  crystal violet