仿酶型磁性铁炭复合催化剂的制备及其特性研究化学工程与技术专业论文.docxVIP

(4) (4) 利用GC—MS对P．NP降解的中间产物进行了分析，发现在类Fenton 降解P—NP的过程中，中问产物主要包括对苯醌、对苯二酚和2，4一二硝基苯酚， 并由此推断出P—NP可能的两条降解路径：一是脱硝基反应生成对苯酚和苯醌； 二是苯环2号位加成生成4．硝基邻苯二酚自由基，最终生成1，2，4．苯三酚。 (5) 仿酶型焦炭／Feo／Fe304降解有机废水的效果，是由制备仿酶复合催 化剂的纳米Fe304、纳米Feo和焦炭三组分协同增效作用的结果。仿酶型焦炭 ／Feo／Fe304是一种高效、无二次污染且能重复使用的绿色催化剂，为开发新型、 高效、低成本、绿色无二次污染的有机废水深度处理技术提供了理论依据。 关键词：四氧化三铁；磁性铁炭复合催化剂；零价铁；酚类有机废水；类Fenton 技术 II 万方数据 AbstractPhenol··containing Abstract Phenol··containing wastewater is considered as typical toxic bio··refractory organic wastewater which considerable damage to the water environment． The Fenton-like reagent appeals to researchers．Biomimetic catalytic degradation is more environmentally friendly，however the synthesis of biomimetic catalysts is hot and difficult point．Biomimetic magnetic iron-carbon composite catalysts were successfully synthesized via oxidation precipitation method，which could be employed to catalyze hydrogen peroxide to oxidize 4-nitrophenol(P—NP)．The catalytic property and reaction mechanism towards P-NP of the catalyst was investigated．The purpose is to develop a novel catalyst of green，efficient and no secondary pollution．The study is summarized follow： (1) Biomimetic Coke／Fe304 catalyst was synthesized via an in—situ oxidation--coprecipitation and used as a heterogeneous Fenton··like catalyst to degrade P—NE Fe304 NPs were evenly and fmrdy dispersed the coke，and its average particle size was about 90nm．Experimental results showed that the P-NP degradation with Coke／Fe304 follows pseudo--first·-order kinetic rate law；the apparent rate constant for the P-NP was evaluated to be 0．027 rain-‘．removal rate of CODcr was 75．47％，and the dissolubility of Fe was 2．42 mg‘L。when at the follow崦initial conditions：[catalyst]=1．2 g．L～，[H2021=30 mmol·L～，pH=3．0， T=30℃and the best mass ratio of Coke／Fe304 was 0．6．Biomimetic Fe30dCoke catalyst had a good chemical stability and reusability． (2)A composite material(Feo／Fe304)using Feo supported Fe304 magnetic nanoparticles Was successfully prepared．The character