| 引用本文: | 刘璟言,卢小艳,朱燕茹,许仕荣,张金松,马军,郭建宁.酸碱及氧化剂对聚偏氟乙烯超滤膜老化的影响[J].哈尔滨工业大学学报,2017,49(8):25.DOI:10.11918/j.issn.0367-6234.201606070 |
| LIU Jingyan,LU Xiaoyan,ZHU Yanru,XU Shirong,ZHANG Jinsong,MA Jun,GUO Jianning.Effect of different chemical cleaning agents on the ageing of PVDF ultrafiltration membrane[J].Journal of Harbin Institute of Technology,2017,49(8):25.DOI:10.11918/j.issn.0367-6234.201606070 |
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| 酸碱及氧化剂对聚偏氟乙烯超滤膜老化的影响 |
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刘璟言1,2,卢小艳2,朱燕茹2,许仕荣1,张金松2,马军3,郭建宁2,3
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(1.湖南大学 土木工程学院,长沙 410082;2.深圳市水务(集团)有限公司,广东 深圳 518033; 3.哈尔滨工业大学 市政环境工程学院,哈尔滨 150090)
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| 摘要: |
| 为研究水处理中超滤膜的老化规律, 利用低浓度的氢氧化钠(NaOH)、碳酸钠(Na2CO3)、次氯酸钠(NaClO)、盐酸(HCl)和柠檬酸(H3Cit)老化聚偏氟乙烯超滤膜.通过纯水通量、TOC截留率、扫描电镜图像、拉伸性能、傅里叶红外光谱等方法表征超滤膜老化的特性, 探索生产中使用的酸碱及氧化剂对PVDF超滤膜结构和性能的影响.结果表明, 酸、碱及氧化剂的使用均会导致PVDF膜的结构及性能退化, 特别是NaOH和NaClO, 其影响更为明显.经NaOH、Na2CO3和NaClO老化75 d后, TOC截留率从36%分别降低至15%、27%和17%.NaOH老化15 d后断裂拉力和伸长率降低11%和20%.碱和氧化剂对膜的截留效果及机械性能的影响大于酸清洗剂.NaClO对膜表面亲水性的影响显著高于其他清洗剂.PVDF的脱氟化氢反应产生C＝O和C＝C键是超滤膜老化的直接原因之一.
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| 关键词: 聚偏氟乙烯超滤膜 清洗剂 老化 水处理 脱氟化氢 |
| DOI：10.11918/j.issn.0367-6234.201606070 |
| 分类号:TU991.2 |
| 文献标识码:A |
| 基金项目:国家水专项深圳市配套(2009ZX07423-003)；中国博士后科学基金资助项目(2016M592541)；国家水专项(2015ZX07406-004) |
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| Effect of different chemical cleaning agents on the ageing of PVDF ultrafiltration membrane |
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LIU Jingyan1,2,LU Xiaoyan2,ZHU Yanru2,XU Shirong1,ZHANG Jinsong2,MA Jun3,GUO Jianning2,3
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(1.College of Civil Engineering, Hunan University, Changsha 410082, China; 2.Shenzhen Water (Group) Co., Ltd., Shenzhen 518033, Guangdong, China; 3.School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China)
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| Abstract: |
| To investigate the aging characteristics of the ultrafiltration membrane used in water treatment, the polyvinylidenefluoride (PVDF) ultrafiltration membrane was aged with sodium hydroxide (NaOH), sodium carbonate(Na2CO3), sodium hypochlorite (NaClO), hydrochloric acid (HCl) and citric acid (H3Cit), respectively. The effect of low-concentration cleaning agents on the aging of the PVDF membrane was investigated, with the analyzing of the parameters of pure water flux, total organic carbon (TOC) rejection, tensile strength, field emission scanning electron microscopy (FESEM), contact angle and fourier transform infrared (FTIR). Experimental result shows that acid, alkali and oxidant, especially NaOH and NaClO, changed the structure and performance of the PVDF ultrafiltration membrane. After exposed to NaOH, Na2CO3 and NaClO for 75 days, the total organic carbon (TOC) rejection efficiencies decrease from 36% to 15%, 27% and 17%, respectively. Compared to the virgin membrane, the tensile strength and ultimate elongation of the membrane which aged 15 days with NaOH declines by 11% and 20%, respectively. The negative effect of alkali and oxidant on mechanical performance and TOC rejection was higher than that of HCl and H3Cit, and the decreasing of hydrophilicity of the membrane exposed to NaClO is more significant than that of the other cleaning agents. The dehydrofluorination, which can generate of C＝C and C＝O bond, is one of the most important reasons that caused the ageing of PVDF membrane.
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| Key words: PVDF ultrafiltration membrane chemical cleaning agent aging water treatment dehydrofluorination |
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