Mesoporous TiO2 based membranes for water desalination and brine processing
Mesoporous TiO2 based membranes for water desalination and brine processing
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DOI：
10.1016/j.seppur.2015.04.028
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发表时间：
2015-06-16
影响因子：
8.6
通讯作者：
da Costa, Joao C. Diniz
中科院分区：
文献类型：
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作者：
Yacou, Christelle;Smart, Simon;da Costa, Joao C. Diniz
这项工作显示了制备，表征和测试的TiO 2膜浸涂在商业α-Al 2 O 3管脱盐。从丙醇钛合成TiO 2薄膜（类似于400 nm），并暴露于温和的热处理以控制颗粒和孔径（dp类似于4 nm）。在渗透蒸发装置中，测试了TiO 2膜的微咸水（0.3重量%）、海水（3.5重量%）和盐水浓度（7.5和10重量%），最高可达75 ℃。微咸浓度下的水通量高达10.5 kg m（-2）h（-1），而最高盐水浓度（10 wt%）下的水通量高达4.0和6.0 kg m（-2）h（-1）。浓度和温度极化都影响水通量，特别是盐水溶液，虽然后者更占主导地位。在所有测试条件下，盐截留率保持非常高，接近99%，从而证明了介孔无机TiO 2结构用于脱盐和盐水处理的可行性。TiO 2膜被证明即使在热循环条件下也能长期稳定（>350 h）。(C)2015 Elsevier B. V.版权所有。
This work shows the preparation, characterisation and testing of TiO2 membranes dip-coated on commercial ot-Al2O3 tubes for desalination. TiO2 thin films (similar to 400 nm) were synthesised from titanium propoxide and exposed to a gentle thermal treatment to control particle and pore sizes (dp similar to 4 nm). The TiO2 membranes were tested for brackish (0.3 wt%), sea water (3.5 wt%) and brine concentrations (7.5 and 10 wt%) up to 75 degrees C in a pervaporation setup. Water fluxes as high as 10.5 kg m(-2) h(-1) were achieved for brackish concentrations, whilst values of up to 4.0 and 6.0 kg m(-2) h(-1) were measured for the highest brine concentration (10 wt%). Concentration and temperature polarisation both affected the water fluxes, particularly for brine solutions, though the latter was more dominant. Salt rejection remained very high at similar to 99% for all tested conditions, thus demonstrating the feasibility of mesoporous inorganic TiO2 structures for desalination and brine processing. The TiO2 membranes proved to be stable for long term (>350 h) testing even under thermal cycling conditions. (C) 2015 Elsevier B.V. All rights reserved.