Optimization of membrane modification using SiO2 for robust anti-fouling performance with calcium-humic acid feed in membrane distillation
Optimization of membrane modification using SiO2 for robust anti-fouling performance with calcium-humic acid feed in membrane distillation
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DOI：
10.1016/j.envres.2018.12.036
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发表时间：
2019-03-01
影响因子：
8.3
通讯作者：
Kim, Jong-Oh
中科院分区：
文献类型：
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作者：
Khan, Aftab Ahmad;Khan, Imtiaz Afzal;Kim, Jong-Oh
本研究的目的是在直接接触膜蒸馏（DCMD）中制备一种抗湿、抗污染的聚醚砜（PES）膜，用于去除含腐植酸（HA）的高盐（NaCI和CaCl2中心点2H(2)O）进料溶液。采用响应面法（RSM）确定了所用材料的最佳配方。选择的可变因素为聚二甲基硅氧烷（PDMS）和二氧化硅（SiO2）；选取液体进入压力（LEP）和接触角（CA）作为响应。扫描电镜（SEM）分析证实了SiO2的沉积，傅里叶变换红外光谱（FTIR）测试证实了膜表面分别在3446、1099 cm（-1）和1150 ~ 1240 cm（-1）处存在新的官能团Si-OH、硅氧烷和C-F键振动。涂膜的平均粗糙度Ra （0.202 ~ 0.242 μ m）比未涂膜的平均粗糙度Ra （0.053 μ m）提高了4倍。在3.5 wt% NaCl + 10 mM CaCl2中心点2H(2)O + 10 mg L-1 HA的条件下，最佳的pe -13膜在DCMD中具有稳定的12 LMH通量和99%的脱盐率，具有抗污染特性。因此，PES-13膜可能是一种用于DCMD的关键膜，用于对抗含有HA的CaCl2中心点2H(2) o的盐溶液。
The goal of this study was to prepare a robust anti-wetting and anti-fouling polyethersulfone (PES) membrane for the rejection of a highly saline (NaCI and CaCl2 center dot 2H(2)O) feed solution containing humic acid (HA) in direct contact membrane distillation (DCMD). Response surface methodology (RSM) was used to determine the optimum formulation of the used materials. The variable factors selected were polydimethyl siloxane (PDMS) and silica (SiO2); liquid entry pressure (LEP) and contact angle (CA) were selected as responses. Scanning electron microscopy (SEM) analysis confirmed the SiO2 deposition and Fourier-transform infrared spectroscopy (FTIR) test evidenced the new functional groups i.e., Si-OH, siloxane, and C-F bond vibrations at 3446, 1099 cm(-1), and 1150-1240 cm(-1) respectively on the membrane surface. The average roughness (Ra) was increased four times for the coated membranes (0.202-0.242 mu m) as compared to that for pristine PES membrane (0.053 mu m). The optimum PES-13 membrane exhibited consistent flux of 12 LMH and salt rejection (> 99%) with anti-fouling characteristic in DCMD using the feed solution of 3.5 wt% NaCl + 10 mM CaCl2 center dot 2H(2)O + 10 mg L-1 HA. The PES-13 membrane may therefore be a key membrane for application in DCMD against CaCl2 center dot 2H(2)O-containing salty solutions with HA.