Influence mechanisms of textile-dyeing sludge characteristics on degradation of anilines by integrated ultrasound-permanganate treatment
Influence mechanisms of textile-dyeing sludge characteristics on degradation of anilines by integrated ultrasound-permanganate treatment
复制标题
纺织印染污泥特性对超声波-高锰酸盐一体化处理降解苯胺的影响机制
DOI：
10.1016/j.jclepro.2017.03.070
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发表时间：
2017-05-10
影响因子：
11.1
通讯作者：
An, Taicheng
中科院分区：
文献类型：
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作者：
Liang, Jieying;Ning, Xun-an;An, Taicheng
为了支持使用集成超声锰（VII）去除苯胺，本研究首次调查了污泥特性对目标苯胺，包括邻甲苯胺，对氯苯胺，2-甲氧基-5-甲基苯胺，和2，4，5-三甲基苯胺的反应动力学的影响。结果表明，1 mM的KMnO 4剂量和0.90 W cm（-3）的超声功率密度，68.85%，85.53%，和78.50%的苯胺可以从纺织污泥厂1，2，3去除。在较低的pH值、较小的粒径和负Zeta电位下，苯胺类化合物的去除率较高。目标苯胺对Mn（VII）表现出显著的反应性，在pH值接近其邻甲苯胺的pKa值时，二级速率常数最大（0.80 M（-1）s（-1），pH 4），对氯苯胺（0.65 M（-1）s（-1），pH 4）、2-甲氧基-5-甲基苯胺（0.45 M（-1）s（-1），pH 4）和2，4，5-三甲基苯胺（0.34 M（-1）s（-1），pH 5）。此外，纺织印染污泥的可生化性大大提高了集成超声锰（VII）处理。该工艺是印染污泥中苯胺类化合物的有效处理方法。(C)2017爱思唯尔有限公司版权所有
In order to support the use of integrated ultrasound-Mn(VII) for the removal of anilines, this study investigated for the first time the influence of the sludge characteristics on the reaction kinetics of target anilines including o-toluidine, p-chloroaniline, 2-methoxy-5-methylaniline, and 2,4,5-trimethylaniline. The results indicated that with a KMnO4 dosage of 1 mM and an ultrasound power density of 0.90 W cm(-3), 68.85%, 85.53%, and 78.50% of anilines can be removed from textile sludge plant 1, 2, and 3. Higher removal efficiency of anilines was achieved at a lower pH value, smaller particle size, and more negative zeta-potential. The target anilines exhibited substantial reactivity toward Mn(VII) with the maxima of second-order rate constants at a pH value near their pKa values for o-toluidine (0.80 M(-1)s(-1) at pH 4), p-chloroaniline (0.65 M(-1)s(-1) at pH 4), 2-methoxy-5-methylaniline (0.45 M(-1)s(-1) at pH 4), and 2,4,5-trimethylaniline (0.34 M(-1)s(-1) at pH 5). Moreover, the biodegradability of textile-dyeing sludge was greatly enhanced by integrated ultrasound-Mn(VII) treatment. This integrated treatment was proposed as an effective method for the disposal of anilines in textile-dyeing sludge. (C) 2017 Elsevier Ltd. All rights reserved.