Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504, Patras, Greece.
Department of Environmental Engineering, University of Western Macedonia, GR-50100, Kozani, Greece.
Environ Sci Pollut Res Int. 2019 Apr;26(12):11905-11919. doi: 10.1007/s11356-019-04604-5. Epub 2019 Feb 28.
In the present work, the sonocatalytic degradation of butylparaben was investigated using Pd immobilized on carbon black as the sonocatalyst. The presence of 25 mg/L 10Pd/C significantly increased the removal rate of butylparaben and the observed kinetic constant increased from 0.0126 to 0.071 min, while the synergy index between sonolysis and adsorption was 70.7%. The BP degradation followed pseudo-first-order kinetics with the apparent kinetic constant decreased from 0.071 to 0.030 min when the initial concentration of butylparaben increased from 0.5 to 2 mg/L. The process was being favored slightly under alkaline conditions. The presence of organic matter (20 mg/L humic acid) reduced the apparent kinetic constant more than two times. The addition of chlorides up to 250 mg/L did not significantly reduce the rate of reaction, while the presence of 250 mg/L bicarbonates reduced the observed kinetic constant from 0.071 to 0.0472 min. The prepared catalyst retains the efficiency after five subsequent experiments since the apparent kinetic constant was only slightly decreased from 0.071 to 0.059 min.
在本工作中，使用负载在炭黑上的钯作为声催化剂研究了对羟基苯甲酸丁酯的超声催化降解。存在 25mg/L 的 10Pd/C 显著提高了对羟基苯甲酸丁酯的去除率，观察到的动力学常数从 0.0126 增加到 0.071min，而声解和吸附之间的协同指数为 70.7%。BP 的降解遵循拟一级动力学，当对羟基苯甲酸丁酯的初始浓度从 0.5mg/L 增加到 2mg/L 时，表观动力学常数从 0.071 减少到 0.030min。在碱性条件下，过程略有偏好。存在有机物（20mg/L 腐殖酸）使表观动力学常数降低了两倍以上。添加高达 250mg/L 的氯化物不会显著降低反应速率，而存在 250mg/L 的碳酸氢盐会使观察到的动力学常数从 0.071 减少到 0.0472min。制备的催化剂在随后的五次实验中保持效率，因为表观动力学常数仅从 0.071 略微降低到 0.059min。
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