UV/H2O2分解染料之動力學

Dye Decomposition Kinetics by UV/H2O2

鍾佳君(Chia-Chun Chung)

指導教授 ： 陳嘉明

大同大學/工程學院/化學工程學系所/碩士(2006年)

摘要

含不可生物分解及毒性有機物之染整工業廢水為重要之一環境污染源，許多高級氧化程序(AOPs)可藉由產生具強氧化力的氫氧自由基，非選擇地分解有機污染物。有機污染物之反應動力模式為設計高級氧化程序所需之資訊，本研究利用UV/H2O2法來分解反應性含氮染料，探討不同的實驗條件，例如：攪拌速率、雙氧水濃度、染料濃度、反應溫度、起始pH值以及UV光照強度對染料降解的動力學影響。實驗結果顯示染料分解速率隨著攪拌速率增加而上升，到300rpm之後漸趨平穩；染料分解速率隨雙氧水初始濃度、染料初始濃度、或溫度升高而上升到某程度，然後隨上述變數上升而分解速率遞減；染料分解速率在酸性時為定值，但在鹼性時隨pH增加而速率遞減；染料分解速率隨UV光強度增加而線性上升。本研究推導出經驗速率方程式並成功地用於吻合上述之實驗數據。

關鍵字

紫外光 ； 染料 ； 動力學 ； 雙氧水

並列摘要

The wastewater from textile industries containing non-biodegradable and toxic organic compounds is one important sources of environmental contamination. Many researches show that advanced oxidation processes (AOPs) can treat organic contaminants by generating hydroxyl radical possessing mighty oxidation ability to decompose the contaminants non-selectively. In order to design an AOP, the reaction kinetic model for the specific pollutant is necessary information. This study aims at investigating the decomposition of acid azo dye by UV/H2O2 process under varying experimental conditions such as agitation speed, hydrogen peroxide concentration, dye concentration, reaction temperature, initial pH, and UV irradiation power. The results show that the dye decomposition rate increases with increasing agitation speed up to 300 rpm and remains constant beyond 300 rpm; the reaction rate increases with increasing initial hydrogen peroxide concentration, initial dye concentration, or temperature to a certain point and then decreases with further increase in the above factors; the reaction rate remains almost constant at lower pH and then decreases with increasing pH; the reaction rate almost linearly increases with increasing UV irradiation power. An empirical rate equation has been developed and used to fit the experimental data successfully.

並列關鍵字

hydrogen peroxide ； UV ； dye ； kinetics

參考文獻

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