Optofluidic membrane microreactor for photocatalytic reduction of CO2
Optofluidic membrane microreactor for photocatalytic reduction of CO2
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DOI：
10.1016/j.ijhydene.2015.12.066
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发表时间：
2016-01-30
影响因子：
7.2
通讯作者：
Li, Lin
中科院分区：
文献类型：
--
作者：
Cheng, Xiao;Chen, Rong;Li, Lin
光催化还原CO2是一种很有前途的技术，可以同时捕获CO2并将其转化为太阳能燃料。然而，目前的光反应器通常面临着比表面积小、光分布不均匀和光子传输差的问题。为了解决这些问题，一种新型的光流控膜微反应器，具有高的表面积与体积比，增强光子和质量传输和均匀的光分布，提出了在这项工作中结合光流控与膜反应器技术的光催化还原CO2与液态水。通过在碳纸上涂覆TiO 2，再用聚四氟乙烯（PTFE）进行疏水处理，制备了TiO 2/碳纸复合膜作为光催化膜。通过测量甲醇产率来评价所提出的光流控膜微反应器的性能。考察了液水流量、光照强度和催化剂负载量对甲醇产率的影响。结果表明，在流量为25 μ L/min，光照强度为8 mW/cm（2）的条件下，甲醇产率最高，为111.0 μ mol/g·cat·h，与文献报道的结果相比，该产率最高。实验结果充分证明了所提出的光流控膜微反应器用于光催化还原CO2的可行性和优越性。版权所有（C）2015，氢能出版物有限责任公司。由爱思唯尔有限公司发布。保留所有权利。
Photocatalytic reduction of CO2 is a promising technology to capture CO2 and convert it into solar fuels simultaneously. However, current photoreactors usually face the problems of low specific surface area, non-uniform light distribution and poor photon transfer. To address these issues, a novel optofluidic membrane microreactor with high surface-area to-volume ratio, enhanced photon and mass transport and uniform light distribution was proposed in this work by combining optofluidics with the membrane reactor technology for the photocatalytic reduction of CO2 with liquid water. A TiO2/carbon paper composite membrane was prepared as the photocatalytic membrane via coating TiO2 onto the carbon paper followed by hydrophobic treatment by poly-tetrafluoroethylene (PTFE) for the separation of the gas/liquid phases. The performance of the proposed optofluidic membrane microreactor was evaluated by measuring the methanol yield. The effects of the liquid water flow rate, light intensity and catalyst loading on the methanol yield were also studied. It was shown that a maximum methanol yield of 111.0 mu mole/g-cat.h was achieved at a flow rate of 25 mu L/min and under the light intensity of 8 mW/cm(2), which is among the top in comparison to the reported data. Results obtained fully demonstrate the feasibility and superiority of the proposed optofluidic membrane microreactor for the photocatalytic reduction of CO2. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.