海藻酸钙负载铁酸钴活化PMS降解盐酸四环素

PMS Activation by Cobalt Ferrite-Loaded Calcium Alginate for Tetracycline Hydrochloride Degradation

摘要: 采用简单的水热–凝胶–冷冻干燥方法制备了海藻酸钙–铁酸钴(CA/CFO)复合催化剂，并将其用于活化过一硫酸盐(PMS)高效降解盐酸四环素(TCH)。系统的结构表征显示微纳粒径的铁酸钴颗粒负载在海藻酸钙微球内。通过不同PMS投加量、催化剂用量、初始pH、共存阴离子、循环实验和活性物种猝灭实验考察复合催化剂的催化性能。结果表明，在CA/CFO投加量为0.5 g/L、PMS添加量为1.0 mmol/L、pH为7时，催化剂的效果最佳，对20 mg/L的TCH去除率可以达到90.65%。共存阴离子实验表明，溶液中的阴离子$C{O}_3^{2-}$ 、$S{O}_4^{2-}$ 、Cl⁻对催化降解起到抑制作用，而$H_{2}P{O}_4^{-}$ 却对催化过程有促进作用。CA/CFO具有良好的循环使用性能，在经过5次循环后，TCH的降解效率依旧维持在90%左右。活性物种猝灭实验表明$S{O}_4^{•-}$ 、$O_2^{•-}$ 和¹O₂在该高级氧化体系中起主要作用。

Abstract: A calcium alginate/cobalt ferrite (CA/CFO) composite catalyst was prepared using a simple hydrothermal-gelation-freeze-drying method and applied to activate peroxymonosulfate (PMS) for the efficient degradation of tetracycline hydrochloride (TCH). Systematic structural characterization showed that micro- and nanosized cobalt ferrite particles were immobilized within the calcium alginate microspheres. The catalytic performance of the composite catalyst was evaluated by examining the effects of PMS dosage, catalyst dosage, initial pH, and coexisting anions, as well as by conducting recycling and reactive species quenching experiments. The results showed that the optimal catalytic performance was achieved at a CA/CFO dosage of 0.5 g/L, a PMS concentration of 1.0 mmol/L, and an initial pH of 7, under which the removal efficiency of TCH at an initial concentration of 20 mg/L reached 90.65%. The coexisting-anion experiments showed that $C{O}_3^{2-}$ , $S{O}_4^{2-}$ , and Cl⁻ inhibited the catalytic degradation of TCH, whereas $H_{2}P{O}_4^{-}$ promoted the catalytic process. CA/CFO exhibited good recyclability, with the TCH degradation efficiency remaining at approximately 90% after five cycles. Reactive species quenching experiments showed that $S{O}_4^{•-}$ , $O_2^{•-}$ , and ¹O₂ played major roles in this advanced oxidation system.