超声/类Fenton技术制备污泥基催化剂研究

A Study on Preparation of Sludge-derived Catalysts by Ultrasound/Fenton-like Treatment

通过超声助力铁、铜双金属类Fenton体系技术将污泥基活性炭活化与金属负载过程进行整合,制备出应用效率高的非均相Fenton催化剂SC-Fe/Cu,用以降解丁基钾黄药模拟废水,探讨了活性物质投加总的物质的量、铁/铜投加比、焙烧温度等因素对催化剂性能的影响,确定最优的制备路径,并采用SEM、EDX、FT-IR和XRD等手段表征复合材料的组成、形貌特征。结果表明,在活性物质投加的物质的量为0.015 mol,铁/铜投加比为8:2,在550℃下焙烧120 min时是最佳的制备条件,制得催化剂SC-Fe/Cu表面粗糙、比表面积增大,Fe_(2)O_(3)为铁元素的主要存在形式,并能较好载于污泥基活性炭载体上,同时Fe-O和Fe-O-Si键出现在活性位点上使催化剂的稳定性和降解性能更优异,并在构建非均相体系降解丁基钾黄药模拟废水反应80 min后,降解率可达90%以上,探索出一种更优的资源化利用市政污泥的方式,且可有效降解选矿废水的环保新思路。

Sludge-derived heterogeneous catalyst(SC-Fe/Cu)with high catalytic ability was synthesized using sludge-based activated carbon and FeSO_(4)·7H_(2)O/CuSO_(4)·5H_(2)O as raw material via ultrasound assisted Fenton treatment,promoting the quantity of metal carry and activated-sludge process.A series of study on catalyst performance,operation condition and heterogeneous Fenton degradation of butyl potassium xanthate was carried out.The prepared catalyst was fully characterized by SEM,XRD,EDX,FT-IR characterization methods.The optimum parameters(the total molar amount of active material 0.015 mol,the iron/copper ratio 8:2,calcination temperature 550℃,calcination time 120 min)for preparation of the catalyst were obtained by single factor experiments.The results indicated that iron element was present in the catalyst in the form of Fe_(2)O_(3),and new chemical bonds Si-O-Fe/Fe-O were formed between iron element and silicon dioxide.The catalytic activity of SC-Fe/Cu was evaluated that more than 90%discoloration were achieved within 90 min by degradation of butyl potassium xanthate under heterogeneous Fenton system,which suggested that SC-Fe/Cu manifested excellent stability of catalytic activity and promoted resource utilization of sludge.