碳掺三氧化二铁芬顿反应降解污染物_环境工程.rar

摘要：多相光助一芬顿技术是目前最具应用潜力的高级氧化技术之一。开发新型多相催化剂、拓宽pH适用范围、提高催化降解效率、降低成本是多相光助芬顿技术工程化应用必须解决的关键问题。该技术的核心是选择合适的载体以合成高效、稳定、廉价的多相催化剂。膨润土由于比表面积大、吸附能力强、价格低廉等优点成为其理想的催化剂载体。本实验以偶氮染料橙II(Orange II)为例，研究由羟基铁柱撑膨润土和十六烷基三甲基溴化胺（CTMAB）焙烧制得的碳掺三氧化二铁催化剂在光照条件下对于染料的脱色和矿化效果。了解光照条件下铁离子的光解作用和过氧化氢受光照的分解作用，结合芬顿试剂降解有机物机理来研究碳改性氧化铁在可见光作用下的协同催化能力。再从pH值、反应温度、光的强度和光的波长来研究反应过程中的影响因素。结果表明：碳掺杂三氧化二铁催化剂芬顿反应在可见光的作用下，降解效率有显著提高。pH值、反应温度、光的强度和光的波长对其都有一定的影响。

关键词：光助芬顿反应，铁柱撑膨润土，催化降解，染料

Abstract：Heterogeneous photo-Fenton process is one of the most promising technologies for organic wastewater treatment. At present, a key problem of this technology development and its industrial application is to develope ideal catalyst, extend the range of pH values for Fenton-type oxidation, increase the catalytic activity of heterogeneous catalyst and lower the cost of treatment. The core of the technology is to select a suitable carrier for synthetise efficient, stable and inexpensive heterogeneous catalysts. Bentonite come to be the ideal catalyst support due to the large surface area, high adsorption capacity and low cost. In this experiment, we use the azo dye Orange II as an example to study carbon-doped iron oxide catalyst made by hydroxyl-iron posts bentonite and CTMAB roast in the condition of vacuum degradation in the no-light conditions and UV irradiation. Learn the photolysis of the iron ions and the decomposition of the hydrogen peroxide in the light, combined with Fenton's reagent degradation of the organic mechanism to study the synergistic catalytic ability of the carbon-modified iron oxide under the visible light. Then, study the factors that affecting the reaction process from the PH, reaction temperature, the wavelength and the intensity of the light. The results showed that: the degradation efficiency of the carbon-doped iron oxide catalyst for Fenton reaction under the visible light has significantly improved. The PH, reaction temperature, the wavelength and the intensity of the light all have a certain impact to the reaction.

Keywords: photo-Fenton process; Fe-pillared bentonite; catalytic degradation; dye