Department of Chemistry, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah 21589, Saudi Arabia.
Department of Chemistry, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah 21589, Saudi Arabia.
Int J Biol Macromol. 2021 Sep 30;187:386-398. doi: 10.1016/j.ijbiomac.2021.07.100. Epub 2021 Jul 17.
In this study, tin oxide‑cobalt oxide nanocatalyst was prepared by a simple method, which grew in spherical particles with an average diameter of 30 nm. Tin oxide-cobalt oxide was further wrapped in alginate polymer hydrogel (Alg@tin oxide-cobalt oxide), and both materials were utilized as nanocatalysts for the catalytic transformation of different pollutants. Tin oxide-cobalt oxide and Alg@tin oxide-cobalt oxide nanocatalysts were tested for the catalytic reduction of 4-nitrophenol, congo red, methyl orange, methylene blue (MB) and potassium ferricyanide in which sodium borohydride was used as a reducing agent. Tin oxide-cobalt oxide and Alg@tin oxide-cobalt oxide nanocatalysts synergistically reduced MB in shorter time (2.0 and 4.0 min) compared to other dyes. The reduction conditions were optimized by changing different parameters. The rate constants for MB reduction were calculated and found to be 1.5714 min and 0.6033 min using tin oxide-cobalt oxide and Alg@tin oxide-cobalt oxide nanocatalysts, respectively. Implementing Alg@tin oxide-cobalt oxide nanocatalyst toward MB reduction in real samples proved its efficacy in sea and well water samples. The catalyst could be easily recovered, recycled and revealed a minimal loss of nanoparticles, which offering a competition and replacement with reputable commercial catalysts.
在这项研究中，通过一种简单的方法制备了氧化锡-氧化钴纳米催化剂，该催化剂在平均直径为 30nm 的球形颗粒中生长。氧化锡-氧化钴进一步包裹在海藻酸钠聚合物水凝胶（Alg@tin 氧化物-氧化钴）中，这两种材料都被用作不同污染物催化转化的纳米催化剂。氧化锡-氧化钴和 Alg@tin 氧化物-氧化钴纳米催化剂被测试用于催化还原 4-硝基苯酚、刚果红、甲基橙、亚甲基蓝（MB）和铁氰化钾，其中硼氢化钠被用作还原剂。与其他染料相比，氧化锡-氧化钴和 Alg@tin 氧化物-氧化钴纳米催化剂协同作用可在更短的时间（2.0 和 4.0 分钟）内还原 MB。通过改变不同的参数来优化还原条件。使用氧化锡-氧化钴和 Alg@tin 氧化物-氧化钴纳米催化剂计算得到 MB 还原的速率常数分别为 1.5714 min 和 0.6033 min。在实际样品中实施 Alg@tin 氧化物-氧化钴纳米催化剂对 MB 的还原证明了其在海水和井水样品中的功效。催化剂可以很容易地回收、再循环，并且纳米颗粒的损失最小，这为与知名商业催化剂的竞争和替代提供了可能。
