(3-氯-2-羟丙基)三甲基氯化铵改性葫芦生物质吸附磷酸盐的动力学、热力学及机理

IF 2.1 4区 化学 Q3 CHEMISTRY, PHYSICAL
Dragana Marković-Nikolić, M. Cakic, G. Petković, G. Nikolić
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引用次数: 10

摘要

在间歇式反应器中研究了季铵改性葫芦生物质对水溶液中磷酸盐的吸附动力学和热力学参数。摘要以木质纤维化的Lagenaria vulgaris壳为原料,与(3-氯-2-羟丙基)三甲氯化铵进行化学反应,得到了含有三甲铵和羟丙基的阳离子吸附剂。用反应动力学和扩散模型分析了不同初始浓度(5 ~ 140 mg L−1)水溶液中磷酸吸附的实验数据。通过对实验结果的线性和非线性回归分析,计算出了特征速率常数。根据初始磷酸盐浓度的不同,磷酸盐吸附在20-30分钟内达到平衡。季铵改性葫芦(QABG)吸附剂在20℃下的最大吸附量为18 mg P g−1。用拟一阶模型的非线性方程(R2 > 0.996)最能描述吸附体系。韦伯-莫里斯模型表明,吸附过程分三个步骤进行,其中颗粒内扩散不是唯一的速率控制步骤。此外,还研究了温度(20℃~ 50℃)对吸附动力学的影响。各种热力学参数表明,磷酸盐的吸附是有利的,是一个放热过程。活化能和粘着概率证实了阴离子交换是主要机制。这些结果为农业残留物在废水处理中的潜在利用提供了有价值的信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Kinetics, thermodynamics and mechanisms of phosphate sorption onto bottle gourd biomass modified by (3-chloro-2-hydroxypropyl) trimethylammonium chloride
The sorption kinetics and thermodynamic parameters of phosphate removal from aqueous solution using quaternary ammonium–modified bottle gourd biomass as a sorbent were studied in a batch reactor. The cationic sorbent, containing trimethylammonium and hydroxypropyl groups, was obtained through the chemical reactions of the lignocellulosic Lagenaria vulgaris shell with (3-chloro-2-hydroxypropyl)trimethylammonium chloride. Experimental data of phosphate sorption from aqueous solutions of different initial concentrations (5–140 mg P L−1) have been analysed by reaction kinetics and diffusion models. The characteristic rate constants calculated by linear and non-linear regression analyses of the experimental results are presented. The phosphate sorption reaches equilibrium in 20–30 min, depending on the initial phosphate concentration. The maximum sorption capacity of quaternary ammonium–modified bottle gourd (QABG) sorbent was 18 mg P g−1 at 20 oC. The sorption system is best described by a non-linear equation of the pseudo first-order model (R2 > 0.996). The Weber–Morris model indicated that the sorption process took place in three steps, whereby the intra-particle diffusion is not the only rate-controlling step. In addition, the effect of temperature (20 oC–50 oC) on sorption kinetics was also investigated. The various thermodynamic parameters suggest that phosphate sorption is favoured and is an exothermic process. The activation energy and the sticking probability confirmed that anion exchange is the dominant mechanism. These results provide valuable information for the potential use of agricultural residues in the treatment of wastewaters.
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来源期刊
CiteScore
2.10
自引率
0.00%
发文量
5
审稿时长
2.3 months
期刊介绍: The journal covers the fields of kinetics and mechanisms of chemical processes in the gas phase and solution of both simple and complex systems.
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