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首页> 外文期刊>RSC Advances >Effects of pH value and temperature on the initiation, promotion, inhibition and direct reaction rate constants of natural organic matter in ozonation
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Effects of pH value and temperature on the initiation, promotion, inhibition and direct reaction rate constants of natural organic matter in ozonation

机译：pH值和温度对臭氧化过程中天然有机物的引发，促进，抑制和直接反应速率常数的影响

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摘要

The effects of pH value and temperature on the initiation (k(I)), promotion (k(P)), inhibition (k(S)) and direct ozone reaction (k(D)) rate constants of natural organic matter (NOM) in water ozonation were investigated in this study. These rate constants were determined using a newly developed method that integrates the classical R-ct concept, the transient steady-state hydroxyl radical ((OH)-O-center dot) concentration model and the pseudo first-order ozone decomposition model. Suwannee River fulvic acid (SRFA) was selected as the model NOM. Our results showed that (1) the variation of pH value from 6.5-8.0 had little influence on k(P); while kI showed a peak value at pH 7.5, and k(S) and k(D) increased with increasing pH, (2) at room temperature, the value of k(D) is 2.7-5.8 times higher than k(I) and that of k(P) is 14-31 times higher than kS at pH 6.5-8.0, indicating that direct ozone reaction and promotion reaction are the dominant pathways for SRFA to react with ozone and (OH)-O-center dot, respectively, and (3) all rate constants showed a strong dependency on temperature and the activation energies for initiation, promotion, inhibition and direct ozone reaction were determined to be 55.3, 25.6, 50.1 and 49.1 kJ mol(-1), respectively. Functional groups in NOM that are potentially responsible for these reactions were discussed. Our results provide deeper insight into the reactions between NOM and ozone/(OH)-O-center dot, and the removal of micropollutants in the ozonation process can be evaluated using the rate constants determined in this study.
机译：pH值和温度对天然有机物（NOM）的引发（k（I）），促进（k（P）），抑制（k（S））和直接臭氧反应（k（D））速率常数的影响在这项研究中对水的臭氧化进行了研究。这些速率常数是使用新开发的方法确定的，该方法结合了经典的R-ct概念，瞬态稳态羟基自由基（（OH）-O-中心点）浓度模型和伪一级臭氧分解模型。 Suwannee河黄腐酸（SRFA）被选为NOM模型。我们的结果表明：（1）pH值在6.5-8.0之间变化对k（P）的影响很小; kI在pH 7.5时出现峰值，并且k（S）和k（D）随着pH的增加而增加;（2）在室温下，k（D）的值是k（I）的2.7-5.8倍在pH 6.5-8.0时，k（P）比kS高14-31倍，表明直接的臭氧反应和促进反应分别是SRFA与臭氧和（OH）-O-中心点反应的主要途径。 ，and（3）所有速率常数都显示出对温度的强烈依赖性，并且用于引发，促进，抑制和直接臭氧反应的活化能分别确定为55.3、25.6、50.1和49.1 kJ mol（-1）。讨论了NOM中可能负责这些反应的官能团。我们的结果提供了对NOM与臭氧/（OH）-O-中心点之间反应的更深入的了解，并且可以使用本研究确定的速率常数来评估臭氧化过程中微量污染物的去除。

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