Development of a three-dimensional photoelectrocatalytic reactor packed with granular sludge carbon photoelectrocatalyst for efficient wastewater treatment
Development of a three-dimensional photoelectrocatalytic reactor packed with granular sludge carbon photoelectrocatalyst for efficient wastewater treatment
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DOI：
10.1016/j.seppur.2021.119642
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发表时间：
2021-09
影响因子：
8.6
通讯作者：
Hui-shan Meng;Yang Liu;P. Liu;Lu-lu Zhou;Chen Chen-Chen;Wei-kang Wang;Juan Xu
中科院分区：
文献类型：
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作者：
Hui-shan Meng;Yang Liu;P. Liu;Lu-lu Zhou;Chen Chen-Chen;Wei-kang Wang;Juan Xu
光催化/电催化在废水处理中的应用受到其固有缺陷的制约，如光催化的光利用率低，电催化的扩散限制等。开发了一种新型的三维光电催化反应器(3D-PER)来降解罗丹明B(RhB)模拟废水。制备了颗粒污泥碳(GSCs)，并将其填充到3D-PER AS颗粒催化剂中，同时发挥了光催化和电催化的作用。在电催化和光催化的协同作用下，3D-PER对RhB的脱色率可达95%以上。特别是，GSC-15的中空结构提高了RhB的脱色效率，并在连续11个周期内表现出稳定的处理性能。GSC-15具有层次化的孔结构和丰富的活性中心，对RhB的降解率高于GSC。确定了光催化和电催化对RhB降解的贡献，光催化主要启动脱色，而电催化在矿化过程中起关键作用。同时，3D-PER出水的毒性大大降低，因为它能有效地分解有毒中间体。本研究论证了3D-PER在难降解废水处理中的应用效果，有利于3D-PER在环境领域的推广应用。
The application of photocatalysis/electrocatalysis in wastewater treatment is constrained by their inherent drawbacks, such as the low utilization efficiency of light for photocatalysis, and the diffusional limitations for electrocatalysis. In this work, a novel three-dimensional photoelectrocatalytic reactor (3D-PER) is developed to degrade Rhodamine B (RhB) simulated wastewater. The granular sewage sludge carbons (GSCs) are fabricated and filled into the 3D-PER as particle catalysts, which exert both photocatalysis and electrocatalysis. The decolorization efficiency of RhB is over 95% in the 3D-PER with the synergy of electrocatalysis and photocatalysis. Especially, the hollow structure of GSC-15 improves the decolorization efficiency of RhB, and exhibits a stable treatment performance over 11 continuous cycles. GSC-15 has hierarchical pore structure with abundant active sites, showing a higher degradation rate to RhB than GSC. The contributions of photocatalysis and electrocatalysis to RhB degradation are identified, that photocatalysis primarily initializes decolorization, while electrocatalysis plays a critical role in mineralization. Meanwhile, the toxicity of 3D-PER effluent is largely reduced for the efficient decomposition of toxic intermediates. This study demonstrates the efficacy of 3D-PER in refractory wastewater treatment, benefitting to the promotion of 3D-PER in environmental applications.