兼具去除COD_(Mn)和NH_(4)^(+)-N双重功能的类芬顿复合材料的制备及性能优化研究

Preparation and performance optimization of Fenton-like composites (SFM) with dual functions of COD_(Mn) and NH_(4)^(+)-N removal

以粉煤灰、污泥、牡蛎壳为基础原料,掺入相应的无机矿物材料,制得2种具有去除高锰酸盐指数(COD_(Mn))和氨氮(NH_(4)^(+)-N)双重功能的新型类芬顿复合材料(SFM),分别记作硅藻土型(CD)、绿沸石型(CGZ),使用SEM扫描电镜对SFM表面形貌以及成分进行了表征,对比研究了这2种SFM在类芬顿体系下对废水中的COD_(Mn)和NH_(4)^(+)-N的吸附去除效果,并采用动力学和吸附等温模型分析其吸附特性。结果表明:CGZ对COD_(Mn)和NH_(4)^(+)-N去除率高于CD,在处理5d后,CGZ对COD_(Mn)和NH_(4)^(+)-N的去除率分别为74.96%和91.2%;CGZ最优制备条件是:基础原料∶绿沸石为2∶8,煅烧温度450℃,煅烧时间100min;最佳使用条件是:20℃,pH=3.5,用量CGZ∶H_(2)O_(2)为2.5g∶1.5mL。2种SFM材料对NH_(4)^(+)-N的吸附过程均符合准二级动力学,且符合Freundlich吸附等温方程。研究结果对废弃物的资源化利用、以及类芬顿复合材料新功能的拓展等具有重要的理论意义和实践指导价值。

Based on fly ash,sludge,and oyster shells,incorporating the corresponding inorganic mineral materials,two new Fenton-like composite materials(SFM) with dual functions of removing NH_(4)^(+)-N and COD_(Mn) were prepared,denoted as diatomaceous earth type(CD),green zeolite type(CGZ) respectively.The surface morphology and composition of SFM were characterized by scanning electron microscope(SEM).The adsorption and removal effects of COD_(Mn) and NH_(4)^(+)-N in wastewater under the Fenton-like system of these two SFMs were comparatively studied,and analyzed their adsorption characteristics using kinetics and adsorption isotherm models.The results showed that the removal rate of COD_(Mn) and NH_(4)^(+)-N by CGZ was higher than that of CD.After 5 days of treatment,the removal rate of COD_(Mn) and NH_(4)^(+)-N by CGZ was 74.96% and 91.2%,respectively.The optimal preparation conditions of CGZ:basic raw material∶green zeolite was 2∶8,the calcination temperature was 450℃,and the calcination time was 100 min.The best conditions for use:20℃,pH 3.5,Dosage CGZ∶H_(2)O_(2) was 2.5 g∶1.5 mL.The adsorption process of NH_(4)^(+)-N on the two SFM materials conformed to the quasi-second-order kinetics and the Freundlich adsorption isotherm equation.The research results had important theoretical significance and practical guiding value for the resource utilization of waste and the expansion of new functions of Fenton-like composite materials.