scholarly journals Environmental-Friendly Catalytic Oxidation Processes Based on Hierarchical Titanium Silicate Zeolites at SINOPEC

Author(s):  
Changjiu Xia ◽  
Xinxin Peng ◽  
Yao Zhang ◽  
Baorong Wang ◽  
Min Lin ◽  
...  
Author(s):  
Rahat Javaid ◽  
Umair Yaqub Qazi

Dyes are used in various industries as coloring agents. The discharge of dyes, specifically synthetic dyes, in wastewater represents a serious environmental problem and causes public health concerns. The implementation of regulations for wastewater discharge has forced research towards either the development of new processes or the improvement of available techniques to attain efficient degradation of dyes. Catalytic oxidation is one of the advanced oxidation processes (AOPs), based on the active radicals produced during the reaction in the presence of a catalyst. This paper reviews the problems of dyes and hydroxyl radical-based oxidation processes, including Fenton’s process, non-iron metal catalysts, and the application of thin metal catalyst-coated tubular reactors in detail. In addition, the sulfate radical-based catalytic oxidation technique has also been described. This study also includes the effects of various operating parameters such as pH, temperature, the concentration of the oxidant, the initial concentration of dyes, and reaction time on the catalytic decomposition of dyes. Moreover, this paper analyzes the recent studies on catalytic oxidation processes. From the present study, it can be concluded that catalytic oxidation processes are very active and environmentally friendly methods for dye removal.


Catalysis ◽  
1987 ◽  
pp. 1-67 ◽  
Author(s):  
G. Chinchen ◽  
P. Davies ◽  
R. J. Sampson

Chemosphere ◽  
2007 ◽  
Vol 68 (2) ◽  
pp. 227-233 ◽  
Author(s):  
Alina-Livia Maciuca ◽  
Emil Dumitriu ◽  
François Fajula ◽  
Vasile Hulea

2018 ◽  
Vol 20 (4) ◽  
pp. 6-12
Author(s):  
Agnieszka Wróblewska ◽  
Mariusz Malko ◽  
Marika Walasek

Abstract This work presents the studies on the epoxidation of limonene to 1,2-epoxylimonene with hydrogen peroxide and over the titanium-silicate Ti-SBA-15 catalyst. The main object of the research was a solvent effect on the epoxidation process. The influence of solvents, such as: methanol, toluene, propan-2-ol (isopropyl alcohol), acetonitrile and ethanol has been studied. Furthermore, the influence of temperature in the range of 0-120°C and the reaction time in the range of 0.25-48 h have been investigated. Gas chromatography and iodometric titration methods were used to establish the products of this process and amount of the unreacted hydrogen peroxide. 1,2-Epoxylimonene, 1,2-epoxylimonene diol, perillyl alcohol, carvone and carveol have been determined as the main products of this process. All these compounds are very valuable raw materials for organic syntheses, medicine or cosmetic and food industry.


Author(s):  
Xin Hong Tai ◽  
Chin Wei Lai ◽  
Joon Ching Juan ◽  
Kian Mun Lee

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