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題名 | UV/H[feaf]O[feaf]光氧化系統分解苯環類污染物之研究=Decomposition and Kinetics of Photo-Oxidizing Benzenoid Contaminants in Aqueous Solution by UV/H[feaf]O[feaf]System |
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作者 | 莊連春; 曾迪華; | 書刊名 | 中國環境工程學刊 |
卷期 | 7:3 1997.09[民86.09] |
頁次 | 頁253-262 |
分類號 | 445.46 |
關鍵詞 | 高級氧化程序; 苯環類化合物; 單氯苯; 硝基苯; 鄰位甲酚; 反應動力; Advanced oxidation process; UV/H[feaf]O[feaf]; Benzenoid compounds; Monochlorobenzene; Nitro-benzene; O-cresol; Reaction kinetics; |
語文 | 中文(Chinese) |
中文摘要 | 本研究利用環狀光反應器對三種苯環類化合物(單氯苯(MCB)、硝基苯(NB)及鄰位 甲酚 (CR) 進行光氧化分解,同時對此三種污染物的去除效率及氧化分解動力參數等進行探 討分析。實驗結果顯示,在不同反應條件下,分解反應速率受苯環上鍵結官能基的不同所影 響,MCB 可於較短的反應時間內被完全分解,至於 NB 及 CR, 則需較長的反應時間才可達 到 90% 以上去除率; 在假一階反應速率常數的探討中,光強度愈強污染物分解速率愈快, 在 H �� O �租K加量方面, 當苯環化合物碳鍵上鍵結的是活性基 (CR) 或氯基 (MCB) 時, 反應系統會有最適 H �� O �租K加量,若鍵結的是去活性基 (NB),則分解速率會隨 H �� O �租K加量的增加而成線性增加;至於溶液的初始 pH 值對系統處理效率的影響,此三種污染 物並無一致的變化趨勢, 其原因可能是受到物種的 pKa 值、無機鹽類抑制及溶液中自由基 產生量的多寡等因素所影響。 簡單之兩階段光反應修正模式中,以 TOC 及TIC分析資料做為 模擬之依據,可成功的表示化合物在光氧化系統中被分解成中間產物及最終離子態化合物的 濃度變化趨勢。 |
英文摘要 | This study employed an annular UV/H�烙�皰hoto-reactor to investigate the efficiency and reaction kinetics for decomposition of monochlorobenzene (MCB),nitrobenzene(NB),and o-cresol (CR) in aqueous solution at various operation conditions, such as light intensity, initial pollutant concentration, solution pH, and H �� O �� dosage. Experimental results indicated that the decomposition rate was affected by the different types of functional groups bonded to the benzene ring. MCB could be easily and completely decomposed within a short reaction time. NB and CR could also be removed with greater than 90% efficiency but required a longer period of time. Assuming the reaction rate to be pseudo-first order reaction, the rate constants increased with increasing light intensity. It was found that the decomposition rate also increased with increasing H �� O �� dosage; however, there was a maximum dosage for benzenoid compounds bonded with activating and Cl groups (CR and MCB in this study, respectively). Beyond this optimum H �� O �� dosage, the increase in degradation rate became insignificant. Although the effect of solution pH on the efficiency of decomposing MCB, NB,and CR was inconsistent, the lowest removal rate was obtained at high pH in all cases. In addition, according to experimental measurements, a simple two-step reaction kinetic model could be used successfully to simulate variations in reactant, intermediate, and end-product concentrations with the reaction time. |
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