Enhanced Photocatalytic Degradation of Environmental Pollutants under Visible Irradiation by a Composite Coating

Liu, Shuqin; Hu, Qingkun; Qiu, Junlang; Wang, Fuxin; Lin, Wei; Zhu, Fang; Wei, Chaohai; Zhou, Ningbo; Ouyang, Gangfeng

doi:10.1021/acs.est.7b00350

Cited by 67 publications

(16 citation statements)

References 44 publications

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“…For the same, sunlight-induced photocatalysis can be considered as a promising approach for the photodegradation of environmental pollutants. 21,22 The fabrication of novel nano-structured-materials with unique physical/chemical properties along with high efficiency towards the photocatalysis are the crucial step and required much attention. 6,7,18,23 Beyond the conventional existing applications of CD, the present work investigate a newer perspective of NP-CD, using the natural sunlight for photoreduction of toxic Cr(VI) to Cr(III), followed by precipitation of Cr(III) salt.…”

Section: Introductionmentioning

confidence: 99%

Sunlight-induced photoreduction of Cr(VI) to Cr(III) in wastewater by nitrogen-phosphorus-doped carbon dots

et al. 2019

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Cr(VI) is a known toxic and non-biodegradable pollutant that results from multiple industrial processes, and can cause significant environmental damage if it is not removed from wastewater. However, it can be reduced to Cr(III), which is less toxic and can be readily precipitated out and removed. Here, a fast and facile single-step technique is reported for the synthesis of nitrogen-phosphorus doped fluorescent carbon dots (NP-CD) using a domestic microwave, as a potential photocatalytic material. Under natural sunlight, a simple photocatalytic experiment reveals that the NP-CD are highly efficient for the quantitative reduction of Cr(VI) to Cr(III) in synthetic contaminated water, in a linear range from 10 ppm (in approximately 10 min) to 2000 ppm (in approximately 320 min) by increasing the sunlight irradiation time followed by its removal by precipitation. NP-CD exhibit high recyclability of up to six cycles without any apparent loss in photocatalytic activity, demonstrating NP-CD as a potential photocatalyst material for Cr(VI) water treatment.

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Section: Introductionmentioning

confidence: 99%

Sunlight-induced photoreduction of Cr(VI) to Cr(III) in wastewater by nitrogen-phosphorus-doped carbon dots

et al. 2019

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“…Geosmin [(4 S ,4a S ,8a R )‐4,8a‐dimethyloctahydronaphthalen‐4a(2 H )‐ol], a nontoxic compound with an unpleasant taste in drinking water, and 9 H ‐fluorene, a ubiquitous polycyclic aromatic pollutant with potent mutagenic and carcinogenic toxicities, are contaminants requiring removal. Ouyang, Zhou, and coworkers addressed this issue by preparing and testing three catalysts . TiO 2 nanoparticles (80–100 nm) were transformed to core‐shell PDA/TiO 2 (12 nm PDA layer).…”

Section: Removal Of Toxic Materialsmentioning

confidence: 99%

Polydopamine – its Prolific Use as Catalyst and Support Material

Molnár

2020

ChemCatChem

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Polydopamine is a mussel-inspired functional material with a unique ability to form surface coatings. It is a green, environmentally benign product available very easily for a multitude of varied applications. This review attempts to collect useful information with respect to polydopamine-based catalytic studies with the use of polydopamine and modified polydopamine preparations loaded with varied catalytically active species including metal ions and metal particles. Major sections are about the use of polydopamine as catalyst material, utilization of immobilized enzymes, removal of toxic materials, results in organic synthesis, and fuel cell applications. A few examples of chiral catalysis and results of recycling studies are also treated. Data collected and analyzed indicate the importance and high potential of polydopamine-based catalysts in sustainable chemistry. of subunits attacked by an immobilized cyclohexeneamine (5) was suggested to be the transition state of CÀ C bond formation.Edouard et al. prepared catalyst 0.29 % PDA/PU by depositing PDA onto polyurethane foam (PU, 180 � 20 mg, 8 cm 3 ) and used it for the reduction of methylene blue (MB) with NaBH 4 . [48] Activities decreased gradually with repeated uses from 100 % to 35 % in run 11 but partial reactivation was achieved upon keeping the sample at 67°C for 8 h (55 % dropping below 10 % in run 13). Exposure to air at room temperature for six days proved to be somewhat more beneficial (90 % conversion in run 14 decreasing to 48 % in run 18). In a recent study they fabricated two oxidized PDA/PU samples and then loaded them with NaBH 4 . [49] One made by the usual method (dopamine/Tris, rt, 12 h, in air; sample PDA O2 PU), whereas the other was made by treating PU in a mixture of dopamine, NaOAc, and NaIO 4 (pH 5, rt, 24 h). The sample was dried (67°C) and washed thoroughly with water (PDA NaIO4 PU). Both products were dipped into an aqueous solution of NaBH 4 (0.1 M, 10 min) to afford boron contents of 2.37 and 2.11 wt%. The catalysts tested in the degradation of MB showed high activities with efficiencies of 97 % and 98 %, respectively (NaBH 4 /MB molar ratio 40, 177 mg and 209 mg catalysts, 25 min). During five reuses, the pH of the reaction medium increased because of boron loss (0.78 wt% and 0.81 wt%). The activity of PDA NaIO4 PU decreased to 89 % in run five. However, dipping the used sample into a 0.1 M NaBH 4 solution restored the original efficiency of 98 %. This, however, was only a temporary remedy, since a low efficiency of 60 % was measured in run 10. PDA was suggested by the authors to act as a redox mediator to prevent the hydrolysis/oxidation of immobilized borohydride.This formula (5) should be moved up and placed before the paragraph starting with "Edouard et al…"The Zuo group used PDA particles (avg. diameter 240 nm) to induce the reduction of MB and rhodamine B (RhB) with NaBH 4 . [50] Quinone moieties of PDA were assumed to channel electrons from NaBH 4 to the dyes. Indeed, PDA oxidized with NaIO 4 exhibited increased degradatio...

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“…In this work, the polydopamine was used as an anchoring material and also to facilitate the growth of the Au NP, however it has been suggested that polydopamine may contribute to the photocatalytic production of hydroxyl radicals, 46 and may sensitise semiconductors such as TiO 2 in addition. 47 Polydopamine has also been used as an immobilisation method of TiO 2 on glass substrates in its own right by Liu et al 48 as shown in Fig. 7.…”

Section: Immobilised Nanomaterialsmentioning

confidence: 99%

Bridging the gap between laboratory and application in photocatalytic water purification

Odling

Robertson

2019

Catal. Sci. Technol.

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Enhanced Photocatalytic Degradation of Environmental Pollutants under Visible Irradiation by a Composite Coating

Cited by 67 publications

References 44 publications

Sunlight-induced photoreduction of Cr(VI) to Cr(III) in wastewater by nitrogen-phosphorus-doped carbon dots

Sunlight-induced photoreduction of Cr(VI) to Cr(III) in wastewater by nitrogen-phosphorus-doped carbon dots

Polydopamine – its Prolific Use as Catalyst and Support Material

Bridging the gap between laboratory and application in photocatalytic water purification

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