A detailed review on advanced oxidation process in treatment of wastewater: Mechanism, challenges and future outlook

Saravanan, A.; Deivayanai, V.C.; Kumar, Pramod; Rangasamy, Gayathri; Hemavathy, R.V.; Harshana, T.; Gayathri, N.; Alagumalai, Krishnapandi

doi:10.1016/j.chemosphere.2022.136524

Cited by 143 publications

(23 citation statements)

References 99 publications

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“…Therefore, water pollution has become a global problem that severely restricts the sustainable development of human society. Traditional wastewater treatment technologies have been developed, including ion exchange, reverse osmosis, oxidation, adsorption, flocculation, ultrafiltration, sedimentation, membranes, and advanced oxidation processes (AOP) [ 16 ]. Among the traditional methods mentioned above, AOP, such as the Fenton reaction and photocatalytic processes, have received extensive attention owing to their advantages of high removal efficiency, low operating cost, simple design, operation at room temperature and pressure, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Carbon-Based Nanomaterials for Catalytic Wastewater Treatment: A Review

2023

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Carbon-based nanomaterials (CBM) have shown great potential for various environmental applications because of their physical and chemical properties. The unique hybridization properties of CBMs allow for the tailored manipulation of their structures and morphologies. However, owing to poor solar light absorption, and the rapid recombination of photogenerated electron-hole pairs, pristine carbon materials typically have unsatisfactory photocatalytic performances and practical applications. The main challenge in this field is the design of economical, environmentally friendly, and effective photocatalysts. Combining carbonaceous materials with carbonaceous semiconductors of different structures results in unique properties in carbon-based catalysts, which offers a promising approach to achieving efficient application. Here, we review the contribution of CBMs with different dimensions, to the catalytic removal of organic pollutants from wastewater by catalyzing the Fenton reaction and photocatalytic processes. This review, therefore, aims to provide an appropriate direction for empowering improvements in ongoing research work, which will boost future applications and contribute to overcoming the existing limitations in this field.

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Section: Introductionmentioning

confidence: 99%

Carbon-Based Nanomaterials for Catalytic Wastewater Treatment: A Review

2023

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“…Advanced oxidation processes (AOPs) are employed to degrade micropollutants in water treatment systems using numerous physical and chemical techniques. , Covering an extensive range of processes, AOPs include ozonation, H 2 O 2 oxidation, Fenton and photo-Fenton processes, photocatalysis, electrochemical oxidation, sonolysis, and numerous variations of the above-mentioned processes using transition metal catalysts and UV lights. , Many studies have demonstrated efficacious removal of micropollutants from contaminated water using the above processes, but the degree of success depends on water quality characteristics, contaminants targeted, system configuration, and chemicals/catalysts utilized among other variables. , The combination of oxidants and UV lights has attracted increasing attention because of their higher efficacy in degrading a wide range of organic micropollutants . Several recent studies have investigated photocatalytic materials that generate oxygenated radicals and photodegrade various micropollutants effectively. ,, There exist two fundamental reactor types: reactors that utilize suspended photocatalysts and those that utilize photocatalysts immobilized on inert surfaces .…”

Section: Introductionmentioning

confidence: 99%

“…28,29 Many studies have demonstrated efficacious removal of micropollutants from contaminated water using the above processes, but the degree of success depends on water quality characteristics, contaminants targeted, system configuration, and chemicals/catalysts utilized among other variables. 30,31 The combination of oxidants and UV lights has attracted increasing attention because of their higher efficacy in degrading a wide range of organic micropollutants. 32 Several recent studies have investigated photocatalytic materials that generate oxygenated radicals and photodegrade various micropollutants effectively.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Membrane Reactor Utilizing Immobile Photocatalytic Active Layer on Membranes for the Removal of Micropollutants

et al. 2023

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Treatment of micropollutant-contaminated water using photocatalytic membrane reactors (PMRs) faces certain operational challenges including catalyst agglomeration and loss of reactor efficiency over time. Designing a PMR with a photocatalytic active layer on the membrane surface could be an alternative strategy to improve the reactor efficiency. Therefore, this study determined the optimum PMR design using commercially available membranes with two different catalysts (ZrO 2 and TiO 2 ) in the presence or absence of ultraviolet (UV) light at both high and low fluences for efficient photodegradation of para-chlorobenzoic acid (pCBA) and 15 different organic micropollutants. Comparing the UV types, vacuum UV (VUV) showed 24−36% higher micropollutant degradation than low-pressure UV (LUV). Micropollutant degradation was 20−36% higher in the presence of the membrane than in its absence and similar at both fluences for both UV types. VUV had 28−35 and 14−21% higher pCBA degradation than LUV at high and low fluences, respectively. The high fluence showed 3.6−6.7 and 12.5−24.5% higher pCBA degradation capacity than the low fluence for LUV and VUV, respectively. Comparing the catalyst types, there was a negligible difference in the degradation efficiency between TiO 2 and ZrO 2 . The results indicate a promising pathway for developing a pilot-scale VUV-equipped PMR for treating micropollutant-contaminated water.

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“…Pollutants can be concentered by physical methods such as adsorption, ion exchange, reverse osmosis, and ultrafiltration [ 3 ], and can also be degraded by chemical methods. Advanced oxidation process (AOP) is a technology which produces highly oxidizing active intermediates to degrade target pollutants [ 4 ]. It can transform stubborn pollutants to smaller degradable intermediates, and finally tear them into water and carbon dioxide in the most ideal circumstances [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…The Fenton reaction, which belongs to one of the AOP technologies, depends on the electron transfer between hydrogen peroxide (H 2 O 2 ) and Fe 2+ . The H 2 O 2 reacts with Fe 2+ to form Fe 3+ and a hydroxyl radical ( · OH) [ 4 ]. The · OH has strong oxidizability and is mainly responsible for the degradation of organic pollutants.…”

Section: Introductionmentioning

confidence: 99%

MoS2/Au Heterojunction Catalyst for SERS Monitoring of a Fenton-like Reaction

Qian

Yang

et al. 2023

Materials

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Fenton technology is one of advanced oxidation process (AOP) methods to treat wastewater through chemical oxidation. Due to the limitations of classical iron-based catalysts, it is still challenging to find suitable catalysts for Fenton-like reactions. Here, MoS2/Au heterojunctions were successfully synthesized by reduction of chloroauric acid in the solution of layered MoS2 prepared by hydrothermal method. As a model molecule, methylene blue (MB) was used as the species to be degraded to evaluate the performance of the catalyst. It was determined by UV–visible spectra that the optimal catalyst can be obtained when MoS2 (mg): HAuCl4 (wt. % mL) is 2:2. The Fenton-like reaction process was monitored by introducing highly sensitive surface enhanced Raman spectroscopy (SERS). The results show that MB can be degraded by 83% in the first 10 min of the reaction, indicating that MoS2/Au has good catalytic performance. In addition, as a fingerprint spectrum, SERS was used to preliminarily analyze the molecular structure changes during the degradation process. The result showed that C-N-C bond was easier to break than the C-S-C bond. NH2 group and the fused ring were destroyed at the comparable speed at the first 30 min. In terms of application applicability, it was showed that MB degradation had exceeded 95% at all the three pH values of 1.4, 5.0, and 11.1 after the reaction was carried out for 20 min. The test and analysis of the light environment showed that the catalytic efficiency was significantly improved in the natural light of the laboratory compared to dark conditions. The possible mechanism based on ·OH and ·O2− from ESR data was proposed. In addition, it was demonstrated to be a first-order reaction from the perspective of kinetics. This study made a positive contribution to broaden of the applicable conditions and scope of Fenton-like reaction catalysts. It is expected to be used as a non-iron catalyst in practical industrial applications. From the perspective of detection method, we expect to develop SERS as a powerful tool for the in situ monitoring of Fenton-like reactions, and to further deepen our understanding of the mechanism.

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A detailed review on advanced oxidation process in treatment of wastewater: Mechanism, challenges and future outlook

Cited by 143 publications

References 99 publications

Carbon-Based Nanomaterials for Catalytic Wastewater Treatment: A Review

Carbon-Based Nanomaterials for Catalytic Wastewater Treatment: A Review

Photocatalytic Membrane Reactor Utilizing Immobile Photocatalytic Active Layer on Membranes for the Removal of Micropollutants

MoS2/Au Heterojunction Catalyst for SERS Monitoring of a Fenton-like Reaction

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