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研究论文

Dye wastewater heterogeneous CWPO treatment based on induction heating fixed bed reactor

基金项目：国家自然科学基金项目（No.50309011）；陕西省攻关计划项目（No.2011K17-03-06）；中央高校基本科研业务专项基金（No.JK200902019）

摘要：感应热固定床（IHFB）作为新型热传递方式下非均相反应器，利用感应加热铁磁材料将热量传递至液相，形成固液界面高温微反应区，促进有机废水降解.实验以海绵铁为感应内核，采用浸渍焙烧法制备了C包覆表层负载NiO的感应热催化剂（mNiO/C），在传统催化湿式过氧化氢法（CWPO）中引入感应热代替传统加热，建立新的基于感应热固定床的CWPO工艺（iCWPO），使其在常温常压下实现对有机底物的高效降解.以直接紫D-BL模拟废水为目标污染物，考察了进水条件对iCWPO降解染料的影响，对感应热微观作用进行了分析，并用UV-Vis对降解产物进行了检测.结果表明，依赖于微界面高温的iCWPO降解效率明显高于常规加热的CWPO，彻底破坏了可见光区染料的显色基团N=N键，对紫外光区苯环也具有一定的降解作用.

Abstract：The induction heating fixed bed reactor (IHFB) was developed in a novel thermal transfer pathway in the aqueous heterogeneous reactions. Due to the high solid/liquid interface temperature generated from the ferromagnetic heating in the micro-reaction zone, the degradation of aqueous organic pollutants was promoted. In this work, we introduced IHFB into the ordinary catalytic wet peroxide oxidation (CWPO) to create a new technology, noted as iCWPO. In order to promote the selective heating, a nickel-impregnated and C-coated catalyst with magnetic core of sponge iron (mNiO/C) was prepared by calcinations. The direct violet D-BL dye wastewater was selected as a target to investigate the performance of iCWPO. The process mechanism in microcosm was analyzed, and the degradation products were detected by UV-Vis. The results showed that iCWPO is superior to the traditional CWPO due to much higher temperature on the reacting micro-surface. The most N=N coloring groups and some benzene ring in the direct violet D-BL dye molecule can be broken in the process.