Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China.
Environ Sci Technol. 2022 Sep 6;56(17):12613-12624. doi: 10.1021/acs.est.2c04312. Epub 2022 Aug 12.
In situ growth of nanostructures on substrates is a strategy for designing highly efficient catalytic materials. Herein, multimetallic CuCoNi oxide nanowires are synthesized in situ on a three-dimensional nickel foam (NF) substrate (CuCoNi-NF) by a hydrothermal method and applied to peroxydisulfate (PDS) activation as immobilized catalysts. The catalytic performance of CuCoNi-NF is evaluated through the degradation of organic pollutants such as bisphenol A (BPA) and practical wastewater. The results indicate that the NF not only plays an important role as the substrate support but also serves as an internal Ni source for material fabrication. CuCoNi-NF exhibits high activity and stability during PDS activation as it mediates electron transfer from BPA to PDS. CuCoNi-NF first donates electrons to PDS to arrive at an oxidized state and subsequently deprives electrons from BPA to return to the initial state. CuCoNi-NF maintains high catalytic activity in the pH range of 5.2-9.2, adapts to a high ionic strength up to 100 mM, and resists background HCO and humic acid. Meanwhile, 76.6% of the total organic carbon can be removed from packaging wastewater by CuCoNi-NF-catalyzed PDS activation. This immobilized catalyst shows promising potential in wastewater treatment, well addressing the separation and recovery of conventional powdered catalysts.
在基底上原位生长纳米结构是设计高效催化材料的一种策略。在此，通过水热法在三维镍泡沫（NF）基底上原位合成了多金属 CuCoNi 氧化物纳米线（CuCoNi-NF），并将其作为固定化催化剂应用于过二硫酸盐（PDS）的活化。通过双酚 A（BPA）和实际废水等有机污染物的降解来评估 CuCoNi-NF 的催化性能。结果表明，NF 不仅作为基底支撑物发挥重要作用，而且还作为材料制备的内部 Ni 源。在 PDS 活化过程中，CuCoNi-NF 作为电子转移的中间媒介，介导 BPA 向 PDS 的电子转移，表现出高活性和稳定性。CuCoNi-NF 首先将电子捐赠给 PDS 以达到氧化态，然后从 BPA 剥夺电子以回到初始状态。CuCoNi-NF 在 pH 值为 5.2-9.2 的范围内保持高催化活性，适应高达 100 mM 的高离子强度，并抵抗背景 HCO 和腐殖酸。同时，通过 CuCoNi-NF 催化的 PDS 活化可以去除包装废水中 76.6%的总有机碳。这种固定化催化剂在废水处理中具有广阔的应用前景，很好地解决了传统粉末催化剂的分离和回收问题。
