scholarly journals Catalytic Oxidation Process for the Degradation of Synthetic Dyes: An Overview

2019 ◽  
Vol 16 (11) ◽  
pp. 2066 ◽  
Author(s):  
Rahat Javaid ◽  
Umair Yaqub Qazi
Keyword(s):  
Catalytic Oxidation ◽  
Catalytic Decomposition ◽  
Metal Catalyst ◽  
Synthetic Dyes ◽  
Wastewater Discharge ◽  
Oxidation Processes ◽  
Tubular Reactors ◽  
Iron Metal ◽  
Degradation Of Dyes ◽  
Coloring Agents

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.

Impact of Synthetic Dyes on Human Health and Environment

2020 ◽  
pp. 146-161
Author(s):  
Ruchi Srivastava ◽  
Irfan Rashid Sofi
Keyword(s):  
Waste Water ◽  
Human Health ◽  
Colloidal Particles ◽  
Water Bodies ◽  
Synthetic Dyes ◽  
Flow Mechanism ◽  
Final Disposal ◽  
Oxidation Processes ◽  
Degradation Of Dyes ◽  
The Impact

Colour is the most important part to make any fabric attractive, but its use for dying has become a major environmental hazard. Colloidal particles present with color increases the turbidity, gives bad appearance, foul odour, and obstructs the penetration of sunlight into water bodies required for the photosynthesis process, which interferes with the oxygen flow mechanism and hence marine life. So, it is essential to remove such pollutants from the waste water before its final disposal into water bodies. Photocatalysis is one of the advance oxidation processes, mainly carried out in the presence of light and suitable photocatalytic materials for the degradation of dyes. This chapter outlines the background of dye chemistry, the application areas, and the impact of dyeing effluents in the environment and on living beings.

scholarly journals Metal Oxide Nanoparticles and their Nanocomposite-based Materials as Photocatalysts in the Degradation of Dyes

2021 ◽  
Vol 12 (5) ◽  
pp. 6557-6579
Keyword(s):  
Metal Oxide ◽  
Anthropogenic Activities ◽  
Metal Oxide Nanoparticles ◽  
Chemical Properties ◽  
Cost Effective ◽  
Oxide Nanoparticles ◽  
Synthetic Dyes ◽  
Characterization Methods ◽  
Degradation Of Dyes ◽  
Physical And Chemical

The introduction of inorganic and organic pollutants into water bodies has become a serious issue globally. The waste streams released from the textile, plastic, leather, paper, pharmaceutical, and food industries introduce different natural and synthetic dyes into the aquatic system. Nanomaterials play a significant role in the photocatalytic degradation of dyes present in wastewater. Inorganic metal oxide nanoparticles have many improved physical and chemical properties and attracted much attention in photocatalytic activities. Dyes have been released in our aquatic bodies due to many anthropogenic activities and caused life-threatening problems. Various conventional methods were reported to remove dyes from water and wastewater; the photocatalytic method is one of the efficient and cost-effective. The present review article includes detailed information on photocatalysis, the potential of metal oxide and their composite materials as photocatalysts in the degradation of toxic dyes, and some common synthetic and characterization methods used for metal oxide-based nanoparticles.

scholarly journals Bacterial Pigments: The Bioactivities and as an Alternative for Therapeutic Applications

2018 ◽  
Vol 13 (12) ◽  
pp. 1934578X1801301 ◽  
Author(s):  
Adzzie-Shazleen Azman ◽  
Christina-Injan Mawang ◽  
Sazaly Abubakar
Keyword(s):  
Food Industry ◽  
Good Alternative ◽  
Biological Properties ◽  
Review Article ◽  
Synthetic Dyes ◽  
Anticancer Activities ◽  
Natural Pigments ◽  
Synthetic Pigments ◽  
Coloring Agents ◽  
Bacterial Pigments

Synthetic pigments have been widely used in various applications since the 1980s. However, the hyperallergenicity or carcinogenicity effects of synthetic dyes have led to the increased research on natural pigments. Among the natural resources, bacterial pigments are a good alternative to synthetic pigments because of their significant properties. Bacterial pigments are also one of the emerging fields of research since it offers promising opportunities for different applications. Besides its use as safe coloring agents in the cosmetic and food industry, bacterial pigments also possess biological properties such as antimicrobial, antiviral, antioxidant and anticancer activities. This review article highlights the various types of bacterial pigments, the latest studies on the discovery of bacterial pigments and the therapeutic insights of these bacterial pigments which hopefully provides useful information, guidance and improvement in future study.

The Historical Development of Catalytic Oxidation Processes

Catalysis ◽  
1987 ◽  
pp. 1-67 ◽  
Author(s):  
G. Chinchen ◽  
P. Davies ◽  
R. J. Sampson
Keyword(s):  
Catalytic Oxidation ◽  
Historical Development ◽  
Oxidation Processes

Effect of Catalyst Calcination Temperature on the Synthesis of MWCNTs-Talc Hybrid Compound Using CVD Method

2013 ◽  
Vol 594-595 ◽  
pp. 63-67
Author(s):  
Siti Shuhadah Mohd Saleh ◽  
Hazizan Md Akil ◽  
Ramdziah Md. Nasir ◽  
Muhammad Razlan Zakaria ◽  
Muhammad Helmi Abdul Kudus
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Source ◽  
Calcination Temperature ◽  
Chemical Vapour ◽  
Catalytic Decomposition ◽  
Metal Catalyst ◽  
Hybrid Compound ◽  
Calcination Temperatures ◽  
Cvd Method ◽  
Multi Walled Carbon Nanotubes

Carbon nanotubes-talc (CNTs-talc) hybrid compound has been successfully synthesized via chemical vapour deposition (CVD) method. A gas mixture of methane/nitrogen (CH4/N2) was used as the carbon source and nickel as the metal catalyst for the growth of CNT hybrid compound. Talc works as substrate or support material which is combined with nickel to form a complex metal-talc catalyst that will react with carbon source to produce the hybrid compound. To study the effect of different calcinations temperature, four different calcinations temperature, 300 °C (C-talc300), 500 °C (C-talc500), 700 °C (C-talc700) and 900 °C (C-talc900) were used. Among these four calcination temperatures for synthesis the multi-walled carbon nanotubes (MWCNTs), C-talc500 is the most optimum calcination temperature to perform catalytic decomposition by reacting in methane atmosphere at 800 °C to produce the CNT-talc hybrid compound.

Catalytic oxidation processes for removing dimethylsulfoxide from wastewater

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