article · Journal of Encapsulation and Adsorption Sciences
Water remediation often relies on adsorption and photocatalysis to reduce harmful contaminants entering aquatic systems. While adsorption captures pollutants, it does not break them down into environmentally benign substances. Conversely, photocatalysis can degrade pollutants, but degradation cannot take place without the prior adsorption of contaminants onto the catalyst surface. Historical research has frequently applied standard isotherm and kinetic models, such as Langmuir, Freundlich, pseudo-first-order, and pseudo-second-order equations, without thoroughly examining the underlying adsorption characteristics. To address these limitations, a clearer understanding of both mechanisms is essential. In photocatalytic processes, material modifications must focus on suppressing electron-hole recombination, enhancing responsiveness to visible light, preventing particle agglomeration, and regulating catalyst morphology, size, and shape to achieve effective pollutant breakdown.
Treating contaminated water effectively requires technologies that do not merely trap hazardous substances, but completely neutralise them. Understanding how adsorption and photocatalytic breakdown interact helps researchers design better water treatment materials. Improving these chemical processes ensures that toxic industrial effluents and environmental pollutants can be degraded safely rather than simply transferred from liquid waste into solid adsorbent materials.
This work informs the early-stage design of advanced materials for water treatment and environmental remediation. Technology developers and environmental engineering firms can use these mechanistic insights to engineer improved photocatalysts by optimising light absorption, particle shape, and charge recombination. Because the work is a conceptual review of fundamental mechanisms and material modification strategies, practical commercial deployment remains at an early, laboratory-based stage of development.
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Adsorption and photo catalysis are the most popular methods applied for the reduction of amount of pollutants that enter water bodies. The main challenge in the process of adsorption is the demonstration of the experimental data obtained from sorption processes. For many decades most of the researchers used adsorption and kinetic of adsorption as a repetitive work to describe the adsorption data by using common models such as, Langmuir and Freundlich for adsorption isotherms; PFO and PSO models for kinetics. This has been done without careful evaluation of the characteristics of adsorption process. It has been well understood that adsorption does not degrade the pollutant to eco-friendly products and photo catalysis will not degrade without adsorption of the pollutant on the catalyst. Therefore, understanding the detailed mechanism of adsorption, as well as, photo catalysis has been presented in this paper. During photo catalysis: modification towards suppression of electron-hole recombination, improving visible light response, preventing agglomeration, controlling the shape, size, morphology, etc. are the most important steps. This mini review also widely discusses the key points behind adsorption and photo catalysis.
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DOI: 10.4236/jeas.2018.84012
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