Use of a photocatalytic membrane reactor for the removal of natural organic matter in water: Effect of photoinduced desorption and ferrihydrite adsorption
Use of a photocatalytic membrane reactor for the removal of natural organic matter in water: Effect of photoinduced desorption and ferrihydrite adsorption
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DOI：
10.1016/j.memsci.2008.05.069
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发表时间：
2008-09
影响因子：
9.5
通讯作者：
K. Choo;R. Tao;Min-Jin Kim
中科院分区：
文献类型：
--
作者：
K. Choo;R. Tao;Min-Jin Kim
光催化降解天然有机物（NOM）是饮用水处理中一个有吸引力的选择。研究了浸没式光催化膜反应器（PMR）去除NOM和控制膜污染的性能。本文重点研究了腐植酸（HA）和湖水NOM在tio2光催化剂和水合铁（FH）吸附剂表面的吸附和解吸。吸附量大的FH颗粒的加入有助于去除tio2颗粒释放的NOM，但悬浮在水中的FH影响了比紫外吸收（SUVA）值较低的湖水NOM的光催化作用。为了防止紫外光被无光催化活性的FH散射，将FH颗粒附着在浸没微滤（MF）膜上，这有助于在长期PMR操作中更好地去除NOM。由于PMR中tio2光催化和FH吸附的协同作用，进一步实现了对水溶液中NOM的去除，同时最大限度地减少了光诱导脱附对NOM的影响。即使在高通量（>25L/m2h）下，只要光催化分解发生，浸没的PMR也不会发生明显的膜污染。
The photocatalytic degradation of natural organic matter (NOM) would be an attractive option in the treatment of drinking water. The performance of a submerged photocatalytic membrane reactor (PMR) was investigated with regard to the removal of NOM and the control of membrane fouling. In particular, this work focused on the adsorption and desorption of humic acids (HA) and lake water NOM at the surface of TiO2photocatalyts and ferrihydrite (FH) adsorbents in the PMR for water treatment. The addition of FH particles with a large sorption capacity helped remove the NOM released from TiO2particles, but FH suspended in water affected the photocatalysis of lake water NOM with a low specific UV absorbance (SUVA) value. To prevent the UV light being scattered by FH without any photocatalytic activity, FH particles were attached to a submerged microfiltration (MF) membrane, which contributed to a greater removal of NOM during long-term PMR operation. The further removal of NOM from aqueous solution was achieved due to the synergistic effect of TiO2photocatalysis and FH adsorption in PMR while minimizing the influence of photoinduced desorption of NOM. No significant membrane fouling occurred when the submerged PMR was operated even at high flux levels (>25L/m2h), as long as photocatalytic decomposition took place.