蛭石类芬顿催化氧化降解紫丁香醇的研究

以蛭石为催化剂,通过激光粒度仪和电子扫描电镜对研磨蛭石进行粒径和形貌分析,研究蛭石类Fenton催化剂降解造纸废水中木质素模拟物紫丁香醇的特性,调查了催化剂研磨制备条件和相关反应条件,如蛭石投加量、初始p H值、H2O2用量、紫丁香醇溶液初始浓度等对紫丁香醇去除率的影响,同时还讨论了紫丁香醇降解过程中的动力学,结果表明:紫丁香醇降解效果随研磨时间的增加而增加,20 min后,蛭石平均粒径6.9μm,基本效果不变;蛭石投加量为1.6 g/L,p H=3,双氧水为1.0 Q_(th)(Q_(th)为理论为量),紫丁香醇的浓度为50 mg/L的条件下,反应60 min后,紫丁香醇去除率基本可达100%,TOC去除率也可达到83.3%;蛭石类芬顿催化氧化降解紫丁香醇过程符合准一级动力学模型。

STUDY ON FENTON-LIKE CATALYTIC OXIDATION FOR SYRINGOL LIGNION BY VERMICULITE

Grinding vermiculite was prepared as heterogeneous Fenton-like catalyst for degrading syringol lignin (SL) from papermaking waste water.The morphology and particle sizes of vermiculite and grinding vermiculite were analyzed by SEM and scattering laser particle analyzer.Influences of vermiculite grinding conditions and reaction conditions,including vermiculite dosage,initial pH,H2O2 dosage and initial SL concentration on SL removal were studied in this paper.Kinetic characteristic of SL removal was also studied.Results showed that SL's removal efficiency increased with grinding time and after grinding for 20 min,grinding vermiculite's catalytic performance remained stable with the average size of grinding vermiculite less than 6.9 μm.When grinding vermiculite's dosage was 1.6 g/L,pH was at 3,dosage of H2O2 was 1.0 Qth,in which denoted theoretical amount,and the concentration of SL was 50 mg/L,after 60 min,SL removal efficiency was 100％ and TOC removal efficiency reached to 83.3％.And the catalytic oxidation process could be well described by the pseudo-first-order model.