Biofouling performance of RO membranes coated with Iron NPs on graphene oxide
Biofouling performance of RO membranes coated with Iron NPs on graphene oxide
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DOI：
10.1016/j.desal.2018.07.005
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发表时间：
2019-02-01
期刊：
影响因子：
9.9
通讯作者：
Fimbres Weihs, G. A.
中科院分区：
文献类型：
--
作者：
Armendariz-Ontiveros, M. M.;Garcia Garcia, A.;Fimbres Weihs, G. A.
研究了聚酰胺商业反渗透膜包覆纳米铁(FeNPs)和氧化石墨烯(GO)的生物污染性能。从墨西哥科尔特斯海获得的饲料水经过预处理、灭菌和接种从科尔特斯海分离的高浓度(10(9)CFU毫升(-1))嗜盐芽孢杆菌MCC1。测定了FeNPs和Go-FeNPs的Zeta电位。测定了涂层膜和未涂层膜的X射线衍射、粗糙度、接触角、渗透率和通量。测定了生物膜的总有机碳、细胞总数、光密度和活/死细胞百分率，以评价生物膜的抗生物污染效果。与纯FeNP相比，GO-FeNP涂层具有较小的团聚倾向和表面粗糙度，接触角(49.1°+/-4.3°)与未涂层膜(50.2°+/-4.3°)相近。尽管FeNP和GO-FeNP涂层降低了膜的透过率，但污染后的膜通量比未污染的膜更大(分别增加18%和5.3%)。FeNP和Go-FeNP涂层膜的生物膜厚度(89%和65%)、细胞总数(67%和40%)、光密度(40%和48%)和总有机碳(91%和98%)均低于未涂层膜，证实了这一点。
Biofouling performance was evaluated for polyamide commercial RO membranes coated with iron nanoparticles (FeNPs) and graphene oxide (GO), under controlled conditions using a cross-flow system. Feed water obtained from the Sea of Cortez, Mexico, was pretreated, sterilized and inoculated with a high concentration (10(9) CFU mL(-1))of Bacillus halotolerans MCC1, isolated from the Sea of Cortez. The zeta potential was determined for FeNPs and GO-FeNPs. XRD, roughness, contact angle, permeance and flux were determined for the coated and uncoated membranes. To evaluate the anti-biofouling effect, total organic carbon, total cell count, optical density and percentage of live/dead cells were determined for the biofilm. The GO-FeNP coating showed less agglomeration tendency and surface roughness compared to pure FeNP, and contact angle (49.1 degrees +/- degrees 4.3) similar to the uncoated membrane (50.2 degrees +/- 4.3 degrees). Despite reducing the membrane permeance, the FeNP and GO-FeNP coatings presented larger fluxes after fouling (18% and 5.3% larger, respectively) than the fouled uncoated membrane. This was corroborated by both FeNP and GO-FeNP coated membranes presenting reduced biofilm layer thickness (89% and 65% thinner), total cell count (67% and 40% lower), optical density (40% and 48% lower) and total organic carbon (91% and 98% lower), than the uncoated membrane.