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采用纳滤膜过滤技术,以一丁基三氯化锡(MBT)、二丁基二氯化锡(DBT)和三丁基氯化锡(TBT)为研究对象,探究溶液的pH、操作压力、运行时间、有机锡的初始浓度以及溶液中Ca~(2+)和腐殖酸的浓度对纳滤膜的膜通量以及有机锡化合物截留率的影响。研究表明:纳滤膜对一丁基锡和三丁基锡有机锡化合物截留率在85%以上;在溶液的pH<5或pH>9时截留率低,膜通量大,在pH=7时截留率最高;截留率随操作压力增加而降低,膜通量呈直线上升,压力为0.5 MPa时为最佳;有机锡化合物初始浓度增加截留率增加,而膜通量变化不大;Ca~(2+)以及腐殖酸都会使截留率增加。通过原子力显微镜扫描发现在被使用过的纳滤膜表面致密、粗糙,有污染物沉积,其可能造成膜污染和膜通量降低。
The nanofiltration membrane was used to investigate the effects of solution pH, operating pressure, pressure and pressure on MBT, DBT and TBT. , Running time, the initial concentration of organic tin and the concentration of Ca2 + and humic acid in the solution on the membrane flux of nanofiltration membrane and organotin compounds rejection rate. The results show that the nanofiltration membrane has a rejection of more than 85% for organotin compounds of monobutyltin and tributyltin, low rejection at membrane pH <5 or pH> 9, large membrane flux and highest rejection at pH = 7 ; The rejection rate decreased with the increase of operating pressure, the membrane flux increased linearly, the pressure was 0.5 MPa, the best; the initial concentration of organotin compounds increased retention, but the flux did not change much; Ca 2+, As well as humic acid will increase the rejection rate. Scanning by atomic force microscopy revealed dense, rough, contaminated deposits on the surface of the used nanofiltration membrane, which could result in membrane fouling and reduced membrane flux.