Abstract：
To promote the cycle of Fe2+/Fe3+ in co-catalytic Fenton and enhance mass transfer in an external circulation sequencing batch packed bed reactor (ECSPBR), super-hydrophilicity MoS2 sponge (TMS) modified by tungstosilicic acid (TA) was prepared for efficiently degrading sulfamethoxazole (SMX) antibiotics in aqueous solution. The influence of hydrophilicity of co-catalyst on co-catalytic Fenton and the advantages of ECSPBR were systematically studied through comparative research methods. The results showed that the super hydrophilicity increased the contact between Fe2+ and Fe3+ with TMS, then accelerated Fe2+/Fe3+ cycle. The max Fe2+/Fe3+ ratio of TMS co-catalytic Fenton (TMS/Fe2+/H2O2) was 1.7 times that of hydrophobic MoS2 sponge (CMS) co-catalytic Fenton. SMX degradation efficiency could reach over 90% under suitable conditions. The structure of TMS remained unchanged during the process, and the max dissolved concentration of Mo was lower than 0.06 mg/L. Additionally, the catalytic activity of TMS could be restored by a simple re-impregnation. The external circulation of the reactor was conducive to improving the mass transfer and the utilization rate of Fe2+ and H2O2 during the process. This study offered new insights to prepare a recyclable and hydrophilic co-catalyst and develop an efficient co-catalytic Fenton reactor for organic wastewater treatment.
摘要：
为了促进Fe2+/Fe3+在共催化Fenton中的循环,增强外循环序批式填充床反应器(ECSPBR)中的传质,制备了钨硅酸（TA）修饰的超亲水性MoS2海绵（TMS），用于高效降解水溶液中的磺胺甲恶唑（SMX）抗生素。通过比较研究方法,系统研究了助催化剂亲水性对助催化Fenton的影响及ECSPBR的优越性。结果表明，超亲水性增加了Fe2+和Fe3+与TMS的接触，然后加速Fe2+/Fe3+循环。TMS共催化Fenton的最大Fe2/Fe3比（TMS/Fe2/H2O2）是疏水性MoS2海绵（CMS）共催化Fenton的1.7倍。在适宜条件下,SMX降解效率可达90%以上。TMS的结构在此过程中保持不变，Mo的最大溶解浓度低于0.06mg/L此外,TMS的催化活性可以通过简单的重新浸渍来恢复。反应器的外循环有利于提高传质性能和过程中Fe2+和H2O2的利用率。这项研究为制备可回收的亲水性助催化剂和开发用于有机废水处理的高效助催化Fenton反应器提供了新的见解。
