Khan Sher Bahadar, Akhtar Kalsoom, Bakhsh Esraa M, Kamal Tahseen, Asiri Abdullah M
Center of Excellence for Advanced Materials Research, King Abdulaziz University, P. O. Box 80203, Jeddah, 21589, Saudi Arabia; Chemistry Department, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah, 21589, Saudi Arabia.
Chemistry Department, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah, 21589, Saudi Arabia.
Chemosphere. 2022 Mar;291(Pt 2):132811. doi: 10.1016/j.chemosphere.2021.132811. Epub 2021 Nov 8.
The need of clean water demands to design an efficient catalytic system with high effective and selective reduction of water pollutants. Here, we successfully prepared copper oxide-tin oxide (CuO-SnO) nanomaterial and further wrapped in Na-alginate hydrogel (Alg/CuO-SnO). CuO-SnO and Alg/CuO-SnO were characterized by FESEM, EDS, FTIR-ATR, and XRD and tested for the reduction of water pollutants. The catalytic ability of CuO-SnO and Alg/CuO-SnO was examined for numerous pollutants like 4-nitrophenol (4-NP), methyl orange (MO), congo red (CR), methylene blue (MB) and potassium ferricyanide (K[Fe(CN)]) where the designed CuO-SnO and Alg/CuO-SnO nanocatalysts were most selective toward MB reduction. Further on optimization of catalyst amount, stability, and reducing agent amount, it was found that the increase of nanocatalyst amount and NaBH concentration increase the rate of MB reduction. CuO-SnO and Alg/CuO-SnO nanocatalysts reduced MB in 3.0 min with reaction rate constants (k) of 1.2944 min and 1.2715 min, respectively. Additionally, Alg/CuO-SnO nanocatalyst was easily recovered by simply pulling hydrogel after completion of reaction and reused four times with no loss in efficiency. Besides, Alg/CuO-SnO nanocatalyst was further investigated in real samples like sea water, irrigation water, well water, university wastewater and found effective for MB reduction even in real samples.
对清洁水的需求要求设计一种高效的催化系统，以高效且选择性地还原水中污染物。在此，我们成功制备了氧化铜-氧化锡（CuO-SnO）纳米材料，并进一步将其包裹在海藻酸钠水凝胶（Alg/CuO-SnO）中。通过场发射扫描电子显微镜（FESEM）、能谱仪（EDS）、衰减全反射傅里叶变换红外光谱（FTIR-ATR）和X射线衍射仪（XRD）对CuO-SnO和Alg/CuO-SnO进行了表征，并测试了它们对水中污染物的还原能力。研究了CuO-SnO和Alg/CuO-SnO对多种污染物如4-硝基苯酚（4-NP）、甲基橙（MO）、刚果红（CR）、亚甲基蓝（MB）和铁氰化钾（K[Fe(CN)]）的催化能力，其中所设计的CuO-SnO和Alg/CuO-SnO纳米催化剂对MB还原具有最高的选择性。进一步优化催化剂用量、稳定性和还原剂用量后发现，纳米催化剂用量和硼氢化钠（NaBH）浓度的增加会提高MB的还原速率。CuO-SnO和Alg/CuO-SnO纳米催化剂分别在3.0分钟内还原MB，反应速率常数（k）分别为1.2944 min⁻¹和1.2715 min⁻¹。此外，反应完成后，只需简单地拉出凝胶即可轻松回收Alg/CuO-SnO纳米催化剂，并且可以重复使用四次而效率无损失。此外，还对Alg/CuO-SnO纳米催化剂在海水、灌溉水、井水、大学废水等实际样品中进行了进一步研究，发现即使在实际样品中它对MB还原也有效。
