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      A review on recent advances in the treatment of dye-polluted wastewater

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          Remediation of dyes in textile effluent: a critical review on current treatment technologies with a proposed alternative.

          The control of water pollution has become of increasing importance in recent years. The release of dyes into the environment constitutes only a small proportion of water pollution, but dyes are visible in small quantities due to their brilliance. Tightening government legislation is forcing textile industries to treat their waste effluent to an increasingly high standard. Currently, removal of dyes from effluents is by physio-chemical means. Such methods are often very costly and although the dyes are removed, accumulation of concentrated sludge creates a disposal problem. There is a need to find alternative treatments that are effective in removing dyes from large volumes of effluents and are low in cost, such as biological or combination systems. This article reviews the current available technologies and suggests an effective, cheaper alternative for dye removal and decolourisation applicable on large scale.
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            Semiconductor heterojunction photocatalysts: design, construction, and photocatalytic performances.

            Semiconductor-mediated photocatalysis has received tremendous attention as it holds great promise to address the worldwide energy and environmental issues. To overcome the serious drawbacks of fast charge recombination and the limited visible-light absorption of semiconductor photocatalysts, many strategies have been developed in the past few decades and the most widely used one is to develop photocatalytic heterojunctions. This review attempts to summarize the recent progress in the rational design and fabrication of heterojunction photocatalysts, such as the semiconductor-semiconductor heterojunction, the semiconductor-metal heterojunction, the semiconductor-carbon heterojunction and the multicomponent heterojunction. The photocatalytic properties of the four junction systems are also discussed in relation to the environmental and energy applications, such as degradation of pollutants, hydrogen generation and photocatalytic disinfection. This tutorial review ends with a summary and some perspectives on the challenges and new directions in this exciting and still emerging area of research.
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              TiO2-assisted photocatalytic degradation of azo dyes in aqueous solution: kinetic and mechanistic investigations

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                Author and article information

                Journal
                Journal of Industrial and Engineering Chemistry
                Journal of Industrial and Engineering Chemistry
                Elsevier BV
                1226086X
                August 2022
                August 2022
                : 112
                : 1-19
                Article
                10.1016/j.jiec.2022.05.013
                3a70451e-c434-41d2-b9de-786101810cd3
                © 2022

                https://www.elsevier.com/tdm/userlicense/1.0/

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