Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, 64 East of Construction Road, Xinxiang, 453007, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210046, China.
Environ Sci Pollut Res Int. 2021 Oct;28(37):51786-51794. doi: 10.1007/s11356-021-14372-w. Epub 2021 May 15.
Catalytic hydrogen reduction appears to be a promising strategy for nitrate removal. However, the danger and low utilization of H are the disadvantages of catalytic hydrogen reduction. Sodium borohydride (NaBH), considered a potential candidate for hydrogen storage, has been investigated as an electron source for the catalytic reduction of contaminants. However, extensive use of NaBH makes commercialization costly and causes environmental pollution. In this study, we prepared supported Cu/Pd bimetallic nanoparticles that could prestore hydrogen. No additional reducing agent was required during the nitrate reduction process. The performance and mechanism of Cu/Pd bimetallic nanoparticles for nitrate reduction are discussed. Good performance was obtained with high reactivity (99.04% nitrate removal efficiency) and high selectivity for N (94.71%). The Cu/Pd bimetallic catalyst could be recovered by NaBH for 5 cycles. Moreover, a 97.49% nitrate removal efficiency was obtained for actual wastewater, indicating good prospects for nitrate reduction applications.
催化加氢还原似乎是一种很有前途的硝酸盐去除策略。然而，H 的危险性和低利用率是催化加氢还原的缺点。硼氢化钠（NaBH）被认为是一种有潜力的储氢材料，已被研究作为催化还原污染物的电子源。然而，NaBH 的广泛使用使得商业化成本高昂，并导致环境污染。在本研究中，我们制备了负载型 Cu/Pd 双金属纳米粒子，它可以预先储存氢气。在硝酸盐还原过程中不需要额外的还原剂。讨论了 Cu/Pd 双金属纳米粒子对硝酸盐还原的性能和机理。该纳米粒子具有高反应性（99.04%的硝酸盐去除效率）和高选择性（94.71%的 N），表现出良好的性能。Cu/Pd 双金属催化剂可以用 NaBH 回收 5 次。此外，实际废水的硝酸盐去除效率达到 97.49%，表明其在硝酸盐还原应用方面具有良好的前景。
