SEQUENTIAL SEPARATION-ADSORPTION MEMBRANE FOR REMOVAL OF MULTI-COMPONENT POLLUTANTS
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摘要: 传统的膜分离难以实现低压下多组分污染物的同步去除。通过错流灌装的方式将沸石咪唑酯骨架结构材料ZIF-8灌装到非对称超滤膜分离层下的指状孔内,制备了序构分离-吸附双功能膜(DFUM),并开展了其对水中复合污染物同步去除性能的研究。在不改变原始膜结构与截留性能的基础上,DFUM内ZIF-8纳米粒子的负载量可达到2.87 mg/cm2。以腐植酸与Cu2+为模型污染物,考察其在多种污染物共存体系的去污性能,结果显示:在0.16 MPa压力和45 L/(m2·h)通量工况下,先分离后吸附的序构设计可同步去除HA和Cu2+,去除率分别为95.4%和97%,Cu2+的去除性能不受共存的腐植酸影响;与表面沉积的方式相比,DFUM对废水中Cu2+的有效去除体积可提高3倍。研究可为水中多组分污染物的低压同步去除提供新的策略。Abstract: Traditional membrane separation is unable to achieve simultaneous removal of multiple pollutants under low pressure. In this paper, the sequenced separation-adsorption dual-function ultrafiltration membrane(DFUM) was prepared by immobilizing ZIF-8 into the finger-like pores of the asymmetric ultrafiltration membrane for multiple pollutants simultaneous removal. Without changing the original membrane structure and retention performance of DFUM, the loading capacity of ZIF-8 nanoparticles could reach 2.87 mg/cm2. The decontamination performance results showed that the sequenced structure could simultaneously remove humic acid and Cu2+ with removal rate of 95.4% and 97%, at a pressure of 1.6 bar and a flux of 45 L/(m2·h) and protected the process of Cu2+ removal from the interference of the coexisted humic acid; compared with the method of surface deposition, the effective removal volume of Cu2+ could be increased by three times by the DFUM. This study provided a novel strategy for excellent removal of multiple pollutants in water.
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[1] SHANNON M,BOHN P W,ELIMELECH M,et al.Science and technology for water purification in the coming decades[J].Nature,2008,452(7185):301-310. [2] JAN E.The rising pressure of global water shortages[J].Nature,2015,517(7532):6. [3] 严丹燕.城市污水再生回用技术研究进展[J].中国资源综合利用,2018,36(1):99-101. [4] GLASSMEYER S T,FURLONG E T,KOLPIN D W,et al.Nationwide reconnaissance of contaminants of emerging concern in source and treated drinking waters of the United States[J].Science of The Total Environment,2017,579:1629-1642. [5] LIAO Z,NGUYEN M N,WAN G,et al.Low pressure operated ultrafiltration membrane with integration of hollow mesoporous carbon nanospheres for effective removal of micropollutants[J].Journal of Hazardous Materials,2020,397:122779. [6] PAN S L,LI J S,NOONAN O,et al.Dual-functional ultrafiltration membrane for simultaneous removal of multiple pollutants with high performance[J].Environmental Science & Technology,2017,51(9):5098-5107. [7] 杨清香,王聪,陈从涛,等.UiO-66对水中重金属离子吸附性能研究[J].水处理技术,2020,46(12):60-63. [8] 胡术刚,栾小凯,颜昌宙,等.改性生物炭的制备及其对水中镉离子的吸附试验[J].环境工程,2019,37(5):12-16,28. [9] 范英宏.生物炭原位覆盖对重金属铜的污染控制[J].环境工程,2019,37(6):155-159. [10] 肖利萍,李嘉欣,王涛,等.硼泥对含铜酸性废水的吸附性能[J].环境科学与技术,2020,43(7):94-100. [11] EGEBERG P K,GJESSING E T,RATNAWEERA H,et al.Natural organic matter[J].Environment International,1999,25(2/3):143-144. [12] HE M,YAO J F,LIU Q,et al.Facile synthesis of zeolitic imidazolate framework 8 from a concentrated aqueous solution[J].Microporous and Mesoporous Materials,2014,184(2):55-60. [13] FANG X F,LI J S,LI X,et al.Internal pore decoration with polydopamine nanoparticle on polymeric ultrafiltration membrane for enhanced heavy metal removal[J].Chemical Engineering Journal,2017,314:38-49. [14] EPA 816-F-09-004.National Primary Drinking Water Regulations (NPDWRs)[S].
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