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OALib Journal期刊
ISSN: 2333-9721
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孔径5nm陶瓷膜对la3+的截留性能
DOI: 10.3969/j.issn.1671-7627.2015.04.007, PP. 34-39
Keywords: 陶瓷膜,镧离子,渗透通量,截留率
Abstract:
采用孔径5nm陶瓷膜处理冶金、电子、化工等工业产生的含la3+废水,考察离子浓度、电解质和溶液ph等对膜分离性能的影响。结果表明:膜对la3+的截留率随离子浓度的增大而减小,膜通量略有下降。当la3+质量浓度由9.1mg/l增加到245.0mg/l时,膜对la3+的截留率从82.4%降低到66.2%,膜渗透通量下降5%。随nacl浓度的增大,膜对la3+的截留率降低,而膜渗透通量增大。当nacl质量浓度增大到100mg/l时,膜对la3+的截留率从69.3%减小到26.0%,膜通量则提高30%以上。溶液ph既改变了膜表面荷电性又改变了la在水中的存在形式,对膜分离性能影响显著。当溶液ph<6时,la主要以游离的la3+形式存在;当ph=10时,la主要以la(oh)3沉淀的形式存在,膜对la3+的截留率大于99%;当ph=6～8时,部分la(oh)2+的存在,增大了膜孔堵塞阻力,导致膜通量较低。调整溶液ph有助于陶瓷超滤膜回收废水中的la3+,实现资源化利用。
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