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Co2+-laddered heterojunction a next-generation solar-photocatalyst: Unusually improved activity for the decomposition of pharmaceuticals, dyes, and microplastics
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Scientists developed a new material that uses sunlight to break down harmful pollutants in water, including antibiotics, dyes, and even microplastic fibers from face masks, within about an hour. This matters because these contaminants often slip through regular water treatment, potentially ending up in our drinking water and food chain, and this sunlight-powered approach offers a cheap, energy-free way to clean them up. While still in the lab-testing stage, this technology could eventually help reduce our exposure to chemicals and tiny plastic particles linked to various health concerns.
Novel and versatile photocatalysts that can work under direct sunlight are in high demand especially for mitigating water contamination. Some of the burgeoning pollutants in water are textile dyes, organic molecules, pharmaceutical products etc. In view of their extensive use, polymers wastes such as microplastics in water bodies are a new cause of concern. Using direct sunlight for the degradation of such pollutants needs the development of solar photocatalysts. We report on a novel next-generation solar-photocatalyst, consisting laddered-heterojunction formed between Co2+- substituted zinc-ferrite core & zinc-oxide shell, to harvest full-solar-spectrum in scavenger-free photodegradation of dyes, pharmaceuticals and microplastics. Using in-house developed protocols and Microwave-assisted-solvothermal-technique (MAST), nanospheres of ∼20-40nm were synthesized first followed by ZnO shell growth in a controlled manner (∼80-180nm) to obtain the core-shell photocatalyst nanospheres using another microwave approach. The absorption of the photocatalyst could be extended upto 852 nm by judiciously doping with Co2+- enabling the utilization of UV-Vis-NIR region of sunlight. As evident from the valence band spectra, the Co2+ substitution introduced free electrons in the conduction band of ZnFe2O4 that resulted in the formation of laddered type-1 heterojunction. With the optimized Co2+ content and ZnO-shell thickness, solar-photocatalytic degradation of Methyl-Orange enhanced 6-&12-times respectively. Complete degradation of antibiotics like Ciprofloxacin (CF), Norfloxacin (NF), and Ofloxacin (OF) under direct sunlight was achieved within an hour. This unusual enhanced activity was attributed to the inclusion of Co2+, conducive band positions leading to higher absorption and reduced recombination. We also showed the degradation of polypropylene microfibers used in face masks to combat the COVID-19 outbreak could also be degraded., indicating their potential to combat microplastic pollution. Our novel photocatalyst holds promise for sunlight-assisted degradation of a wide range of hazardous pollutants.
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Scientists engineered a special material (tiny fibers made of titanium dioxide and a light-sensitive compound) that, when activated by regular visible light, can break down two nasty water pollutants at once: antibiotic residues and microplastic particles. In lab tests, this material removed nearly all traces of an antibiotic and other contaminants from water, and it also broke down tough plastic particles into smaller fragments—all while staying reusable for at least nine rounds without falling apart or leaching harmful metals. This matters because current water treatment plants struggle to remove both antibiotics (which fuel drug-resistant bacteria
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This review examines how microplastics and antibiotics interact in water during photocatalytic treatment, finding that microplastics can both help (by shuttling electrons) and hinder (by shielding light or hosting biofilms) the degradation process, depending on conditions. Aged microplastics — which have more surface oxygen groups — adsorb more antibiotics, making them tougher composite targets for treatment systems. Understanding these interactions is essential for designing water purification systems that can handle the combined pollution reality of modern waterways.
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Scientists found that when microplastics break down in water, the leftover organic material can actually help sunlight destroy certain pollutants like phenol (a common industrial chemical) much more effectively—boosting removal from 23% to over 91% in lab tests. However, this process also creates new combined molecules called "oligomers," so while microplastics may help clear out some pollutants, they might also be generating new byproducts whose safety for humans and ecosystems isn't yet known.
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This review examines how light-activated materials called photocatalysts can break down microplastics in water into harmless byproducts using sunlight or UV light. While still facing challenges with incomplete breakdown and variable sunlight conditions, this technology offers a promising way to reduce microplastic contamination in water sources that affect human health.
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Scientists are improving a sunlight-powered material called BiOCl that can break down harmful pollutants in water, including pesticides, pharmaceutical residues, industrial chemicals, and even plastic waste—all things that can contaminate our water supplies and affect human health. This review paper summarizes recent research showing that newer versions of this material work 2-6 times better than earlier versions at destroying these contaminants, though scientists are still working out how to make it practical for large-scale, real-world water treatment.
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