Solar Disinfection (SODIS) Provides a Much Underexploited Opportunity for Researchers in Photocatalytic Water Treatment (PWT)

Cowie, Bradley E.; Porley, Victoria; Robertson, Neil

doi:10.1021/acscatal.0c03325

Cited by 40 publications

(13 citation statements)

References 33 publications

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“…The SODIS process involves placing the water (untreated or partially treated) into a specific container in most cases made from plastic or glass and then exposing it to direct sunlight for a certain period of time before drinking [1]. Glass containers considered more transparent and can be used to provide better sunlight penetration, but they have been linked with many drawbacks including blocking UV radiation, high expenses, fragility, and weight, making use of polyethylene terephthalate (PET) or polyethylene (PE) [71,72].…”

Section: Initial Water Quality and Type Of Containermentioning

confidence: 99%

“…Access to safe drinking water is essential to health, which has been always a major concern as one of the basic human health fundamental rights worldwide. More than 2 billion people around the world lack proper sanitation and hygiene in terms of drinking water [1]. Treatment techniques for drinking water in many undeveloped and developing countries are either insufficient or inaccessible, and thus, millions lack access to safe water service.…”

Section: Introductionmentioning

confidence: 99%

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Insights into Solar Disinfection Enhancements for Drinking Water Treatment Applications

et al. 2021

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Poor access to drinking water, sanitation, and hygiene has always been a major concern and a main challenge facing humanity even in the current century. A third of the global population lacks access to microbiologically safe drinking water, especially in rural and poor areas that lack proper treatment facilities. Solar water disinfection (SODIS) is widely proven by the World Health Organization as an accepted method for inactivating waterborne pathogens. A significant number of studies have recently been conducted regarding its effectiveness and how to overcome its limitations, by using water pretreatment steps either by physical, chemical, and biological factors or the integration of photocatalysis in SODIS processes. This review covers the role of solar disinfection in water treatment applications, going through different water treatment approaches including physical, chemical, and biological, and discusses the inactivation mechanisms of water pathogens including bacteria, viruses, and even protozoa and fungi. The review also addresses the latest advances in different pre-treatment modifications to enhance the treatment performance of the SODIS process in addition to the main limitations and challenges.

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Section: Initial Water Quality and Type Of Containermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insights into Solar Disinfection Enhancements for Drinking Water Treatment Applications

et al. 2021

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“…A variety of advanced oxidation processes (AOPs) including the Fenton/Fenton-like reaction, , ozonation, peroxymonosulfate activation, and photocatalytic oxidation have been testified to degrade ECs via the generation of different types of reactive oxygen species . Among these AOPs, visible-light or solar-driven photocatalysis is regarded as one of the most promising strategies to remove ECs from water due to the usage of sustainable sunlight . Different types of metal-based materials such as TiO 2 , α-Fe 2 O 3 , MoS 2 , and MOFs have been tested and shown to be effective in the photocatalytic degradation of ECs. − However, the potential release of metal ions from most of these photocatalysts into the water could produce secondary contamination .…”

Section: Introductionmentioning

confidence: 99%

Thiadiazole-Based Covalent Organic Frameworks with a Donor–Acceptor Structure: Modulating Intermolecular Charge Transfer for Efficient Photocatalytic Degradation of Typical Emerging Contaminants

Hou

Liu

Zhang

et al. 2022

Environ. Sci. Technol.

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As novel metal-free photocatalysts, covalent organic frameworks (COFs) have great potential to decontaminate pollutants in water. Fast charge recombination in COFs yet inhibits their photocatalytic performance. We found that the intramolecular charge transfer within COFs could be modulated via constructing a donor−acceptor (D−A) structure, leading to the improved photocatalytic performance of COFs toward pollutant degradation. By integrating electron donor units (1,3,4-thiadiazole or 1,2,4-thiadiazole ring) and electron acceptor units (quinone), two COFs (COF-TD1 and COF-TD2) with robust D−A characteristics were fabricated as visible-light-driven photocatalysts to decontaminate paracetamol. With the readily excited electrons in 1,3,4-thiadiazole rings, COF-TD1 exhibited efficient electron−hole separation through a push−pull electronic effect, resulting in superior paracetamol photodegradation performance (>98% degradation in 60 min) than COF-TD2 (∼60% degradation within 120 min). COF-TD1 could efficiently photodegrade paracetamol in complicated water matrices even in river water, lake water, and sewage wastewater. Diclofenac, bisphenol A, naproxen, and tetracycline hydrochloride were also effectively degraded by COF-TD1. Efficient photodegradation of paracetamol in a scaled-up reactor could be achieved either by COF-TD1 in a powder form or that immobilized onto a glass slide (to further ease recovery and reuse) under natural sunlight irradiation. Overall, this study provided an effective strategy for designing excellent COF-based photocatalysts to degrade emerging contaminants.

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“…In the latter context, the use of the photocatalysts in water bottles is really interesting. 49 Although plastic bottles are cheaper and their solar irradiation does not induce excessive leaching of hazardous compounds, 50 the use of glass bottles can be an answer to the worldwide plastic environmental crisis. 51 This study works in this scenario as the assays are performed in closed glass vials.…”

Section: Introductionmentioning

confidence: 99%

“…Photocatalysis can be applied in two different scenarios: the treatment of a large volume of water for community sanitization or smaller volumes for individual or small groups. In the latter context, the use of the photocatalysts in water bottles is really interesting . Although plastic bottles are cheaper and their solar irradiation does not induce excessive leaching of hazardous compounds, the use of glass bottles can be an answer to the worldwide plastic environmental crisis .…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Cellulose-Paper: Deepening in the Sustainable and Synergic Combination of Sorption and Photodegradation

et al. 2021

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Clean water is one of the sustainable development goals set by the United Nations for 2030. The development of effective but worldwide affordable strategies is essential to guarantee this achievement. Photocatalysis technology fulfills these criteria whenever the photocatalyst is sustainable and nontoxic. In this article, a cellulose-paper modified with a polyamide-titanium dioxide (TiO 2 ) nanocomposite by dip-coating is evaluated to degrade estrogens efficiently under solar light. The study deepens on the synergic combination of the sorptive capacity of the polyamide and the activity of TiO 2 . The photocatalytic performance was studied under artificial and sunlight in a miniaturized experimental setup (batch of six reactors). Also, the effects of the dispersed/immobilized catalyst, irradiation time, and adsorption evaluation were studied under kinetic conditions. The photocatalyst composition, considering the polyamide (nylon-6) and TiO 2 amounts and the dipping cycles, was studied by a response surface methodology, and the reusability of the photocatalytic cellulose-paper was investigated. The LED source provided removal efficiencies of 65, 62, and 52% (for estrone, 17β-estradiol, and estriol, respectively) after 420 min of light exposure. Under sunlight, the efficiency increased up to 99.5% for estrone and 17β-estradiol and 98.5% for estriol after 180 min of irradiation. The sustainable character of the cellulosic substrate, the low toxicity of the nanocomposite ingredients, and its performance under sunlight make the material attractive for in-field application.

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Solar Disinfection (SODIS) Provides a Much Underexploited Opportunity for Researchers in Photocatalytic Water Treatment (PWT)

Cited by 40 publications

References 33 publications

Insights into Solar Disinfection Enhancements for Drinking Water Treatment Applications

Insights into Solar Disinfection Enhancements for Drinking Water Treatment Applications

Thiadiazole-Based Covalent Organic Frameworks with a Donor–Acceptor Structure: Modulating Intermolecular Charge Transfer for Efficient Photocatalytic Degradation of Typical Emerging Contaminants

Photocatalytic Cellulose-Paper: Deepening in the Sustainable and Synergic Combination of Sorption and Photodegradation

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