采用孔径为1.5 nm的TiO2纳滤膜,在压力0.4～0.8 MPa,pH值3～7的条件下,考察了膜对浓度范围为50～500 mg/L的Cu(NO3)2、Ni(NO3)2、ZnC12和CdC12四种单组份重金属溶液的截留性能.结果表明:除Cd2+外,膜对重金属离子的截留率随溶液浓度的增大先增大,当浓度达到200 mg/L后趋于稳定；升高压力膜的离子截留率会略有增加；当pH=6时,膜对Ni2+和Cd2+的截留率最低,而对Cu2+和Zn2+的截留率在pH=5～6时达到最高.TiO2膜对Cu2+、Ni2+、Zn2+和Cd2+的最高截留率分别可以达到96.9％、95.9％、92.5％和83.2％.
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