Bioinspired modification of molybdenum disulfide nanosheets to prepare a loose nanofiltration membrane for wastewater treatment
Bioinspired modification of molybdenum disulfide nanosheets to prepare a loose nanofiltration membrane for wastewater treatment
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二硫化钼纳米片仿生改性制备松散纳滤膜用于废水处理
DOI：
10.1016/j.jwpe.2020.101759
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发表时间：
2020-11
影响因子：
7
通讯作者：
Jiang Yanjun
中科院分区：
文献类型：
--
作者：
Zhao Hao;Liu Guanhua;Zhang Miyu;Liu Hengrao;Zhang Min;Zhou Liya;Gao Jing;Jiang Yanjun
疏松纳滤膜具有较高的染料截留率和盐渗透率，适用于废水处理，特别是染料溶液的脱盐。在这项研究中，MoS2@PDA通过用聚多巴胺（PDA）修饰二硫化钼（MoS 2）纳米片来制备。然后，采用压力辅助自组装法在水解聚丙烯腈（HPAN）超滤膜上沉积MoS2@PDA，制备了疏松纳滤膜。通过SEM、TEM、TGA、FT-IR、AFM、WCA、XRD和SEM-电位等手段对MoS2@PDA和MoS2@PDA纳米功能材料的形貌和性能进行了分析。MoS 2纳米片表面的PDA纳米聚集体干扰了MoS 2纳米片平行于膜表面的规则堆叠，因此所得膜呈现不规则的疏松结构，可沿着不渗透的纳米片表面提供跨膜通道供分子扩散。当MoS 2负载量为0.116 mg/cm 2，PDA改性时间为5 h时，MoS2@PDA NFM的纯水通量可达204.05 LMH/bar，对亚甲基蓝的截留率为99%，对NaCl、Na 2SO 4、MgCl 2、MgSO 4的截留率均小于12%。MoS2@PDA NFM表现出令人满意的长期操作稳定性。该研究为高性能松式纳滤膜的设计提供了新的思路。
Loose nanofiltration membrane (NFM) is suitable for wastewater treatment especially for dye solution desalination due to its high rejection of dyes and high permeance of salts. In this study, MoS2@PDA was prepared by modifying molybdenum disulfide (MoS2) nanosheets with polydopamine (PDA). Then, the loose nanofiltration membrane was prepared by the deposition of MoS2@PDA on hydrolyzed polyacrylonitrile (HPAN) ultrafiltration membrane with pressure-assisted self-assembly. The morphology and properties of MoS2@PDA and MoS2@PDA NFMs were analyzed by SEM, TEM, TGA, FT-IR, AFM, WCA, XRD, andζ-potentials. The PDA nanoaggregates on the surface of MoS2nanosheets interfered with the regular stacking of MoS2nanosheets parallel to the membrane surface, so the resultant membranes showed irregular loose structure which could provide transmembrane channels along with the impermeable nanosheet surface for molecule diffusion. When the MoS2loading was 0.116 mg/cm2and the PDA modification time was 5 h, the pure water flux of MoS2@PDA NFM could reach 204.05 LMH/bar, the rejection of methylene blue was 99 %, and rejection of salts (NaCl, Na2SO4, MgCl2, MgSO4) were less than 12 %. And MoS2@PDA NFM exhibited satisfactory long-term operational stability. This study provides a new strategy for the design of loose nanofiltration membrane with high performance.
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