An effective and selective catalytic system based on cerium oxide-stannous oxide (CeO₂-SnO) wrapped Na-alginate hydrogel was developed for the selective reduction of potassium ferricyanide (K₃[Fe(CN)₆]). Na-alginate hydrogel was used as a reacting container for CeO₂-SnO nanoparticles. Na-alginate wrapped CeO₂-SnO (Alg/CeO₂-SnO) was applied as a catalyst and examined toward the reduction of several hazardous pollutants, such as nitrophenols, dyes and K₃[Fe(CN)₆]. Alg/CeO₂-SnO nanocatalyst was mostly selective toward K₃[Fe(CN)₆] since it was more effective and economical for reduction of K₃[Fe(CN)₆]. Further different parameters like catalyst amount, reducing agent amount, K₃[Fe(CN)₆] concentration and recyclability were optimized. The increase in both nanocatalyst amount and NaBH₄ concentration resulted in increasing the rate of the catalytic reduction of K₃[Fe(CN)₆]. Alg/CeO₂-SnO nanocatalyst reduced K₃[Fe(CN)₆] in 4.0 min with a reaction rate constant of 0.9114 min⁻¹. The nanocatalyst can be easily recovered by pulling the hydrogel from the reaction medium up to four cycles. Alg/CeO₂-SnO nanocatalyst was also examined in real samples like irrigation water, sea water, well water, university water, which was effective for K₃[Fe(CN)₆] reduction by 95.16%–96.54%. This novel approach provides a new catalyst for efficient removal of K₃[Fe(CN)₆] from real samples and can be a time and cost alternative tool for environmental safety.

开发了一种基于氧化铈-氧化亚锡 (CeO ₂ -SnO) 包裹的海藻酸钠水凝胶的有效和选择性催化系统，用于选择性还原铁氰化钾 (K ₃ [Fe(CN) ₆ ])。海藻酸钠水凝胶用作CeO ₂ -SnO 纳米颗粒的反应容器。海藻酸钠包裹的 CeO ₂ -SnO (Alg/CeO ₂ -SnO) 被用作催化剂，并研究了几种有害污染物的还原，如硝基苯酚、染料和 K ₃ [Fe(CN) ₆ ]。Alg/CeO ₂ -SnO 纳米催化剂主要对 K ₃ [Fe(CN) ₆] 因为它对于减少 K ₃ [Fe(CN) ₆ ]更有效和更经济。进一步优化了催化剂用量、还原剂用量、K ₃ [Fe(CN) ₆ ] 浓度和可回收性等不同参数。纳米催化剂量和NaBH ₄浓度的增加导致K ₃ [Fe(CN) ₆ ]的催化还原速率增加。Alg/CeO ₂ -SnO 纳米催化剂在 4.0 分钟内还原 K ₃ [Fe(CN) ₆ ]，反应速率常数为 0.9114 min ^-1. 通过将水凝胶从反应介质中提取多达四个循环，可以很容易地回收纳米催化剂。Alg/CeO ₂ -SnO 纳米催化剂还在灌溉水、海水、井水、大学用水等实际样品中进行了检测，其对 K ₃ [Fe(CN) ₆ ] 的还原效率降低了 95.16%–96.54%。这种新方法为从实际样品中有效去除 K ₃ [Fe(CN) ₆ ]提供了一种新催化剂，并且可以作为环境安全的时间和成本替代工具。