In this paper, we propose an efficient simultaneous refractory organics degradation and electricity generation method for carbonate-containing wastewater based on carbonate radical reactions initiated by a BiVO4-Au/PVC (PVC: photovoltaic cell) system. In the system, nanoporous BiVO4 film and Au modified PVC were used as photoanode and photocathode, respectively. HCO3- was used as the electrolyte. Carbonate radicals, which have lower recombination rates than hydroxyl radicals and strong oxidation abilities, can be generated easily by the capture reaction of hydroxyl radicals with HCO3-, which is one of the most abundant anions in the aquatic environment. The results show that the removal ratios of rhodamine b, methyl orange and methylene blue in the system increased sharply to 77.98 %, 89.15 % and 93.2 % from 18.23 %, 21 % and 23.14 % (BiVO4-Pt/ SO42-), respectively, after 120 min. Meanwhile, the short-circuit current density is up to 2.19-2.41 times larger than the traditional system. Other common ions in natural water minimally affected the properties of the new system. The excellent performance could be ascribed to large amounts of carbonate radicals in the system, which have great potential for efficient carbonate-containing wastewater treatment and energy recovery.

中文翻译：

---

基于BiVO4-Au / PVC系统引发的碳酸盐自由基反应，可有效地对含碳酸盐废水进行有机污染物转化和发电。

在本文中，我们基于BiVO4-Au / PVC（PVC：光伏电池）系统引发的碳酸根自由基反应，提出了一种有效的同时处理难降解有机物的方法，用于含碳酸盐废水的发电。在该系统中，分别使用纳米多孔BiVO4膜和Au改性的PVC作为光电阳极和光电阴极。使用HCO 3-作为电解质。具有比羟基自由基低的重组率和强氧化能力的碳酸根自由基可通过羟基自由基与HCO3-的捕获反应而轻易生成，HCO3-是水生环境中最丰富的阴离子之一。结果表明，若丹明b，甲基橙和亚甲基蓝在系统中的去除率从18.23％，21％和23急剧增加至77.98％，89.15％和93.2％。120分钟后分别为14％（BiVO4-Pt / SO42-）。同时，短路电流密度高达传统系统的2.19-2.41倍。天然水中的其他常见离子对新系统的性能影响很小。优异的性能可以归因于系统中的大量碳酸盐自由基，它们对于有效地处理含碳酸盐废水和回收能源具有巨大潜力。