Visible light-driven photoactivity of zinc oxide impregnated chitosan beads for the detoxification of textile dyes

Farzana, Maisha; Meenakshi, Sankaran

doi:10.1016/j.apcata.2014.12.034

Cited by 43 publications

(21 citation statements)

References 48 publications

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“…These changes could be attributed to the presence of sulphur-containing groups and are in accordance with those obtained by other researchers [55]. In the case of PES membranes with ZnO nanoparticles, two new absorption bands appeared at 1660 cm -1 and at 3100-3600 cm -1 respectively, which could be assigned to O-H groups of adsorbed water by hydrophilic nano-sized ZnO [56][57][58]. observed by other researchers in previous studies [59].…”

Section: Morphological Studysupporting

confidence: 80%

Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes

García-Ivars

Iborra–Clar

Alcaina–Miranda

et al. 2015

Journal of Membrane Science

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ElsevierGarcía Ivars, J.; Iborra Clar, MI.; Alcaina Miranda, MI.; Van Der Bruggen, B. (2015). Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes. ABSTRACTInorganic nanoparticles have been applied as additive in membrane synthesis for improving different properties from the base polymer such as hydrophilicity, fouling resistance or permselectivity. To investigate the changes caused by the presence of the inorganic nanoparticles in the formation of the membrane structure, two different metallic compounds with opposite hydrophilicity were used as additives: hydrophilic zinc oxide (ZnO) and hydrophobic tungsten disulphide (WS 2 ). For this purpose, the effect of these metal nanoparticles at ultra-low concentrations (0.05 and 0.25 wt% metal nanoparticles/polymer ratio) in the preparation of flat-sheet membranes based on polyethersulphone (PES) by immersion-precipitation method was investigated. Nmethyl-2-pyrrolidone (NMP) was used as solvent. The influence of both metal nanoparticles on the characteristics and permselective properties of PES membranes was studied with microscopic observations, contact angle measurements, and filtration experiments. Although the incorporation of metal nanoparticles could turn the system into thermodynamically unstable, the demixing process during formation of membranes was slightly delayed, suppressing the macrovoid formation (remarkably using WS 2 ).Regardless the nature of the metal nanoparticles, results showed an overall improvement in membrane hydrophilicity and permselectivity by adding metal nanoparticles compared to the control PES membrane, demonstrating that the behaviour of both metal nanoparticles at ultra-low concentrations was very similar.

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Section: Morphological Studysupporting

confidence: 80%

Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes

García-Ivars

Iborra–Clar

Alcaina–Miranda

et al. 2015

Journal of Membrane Science

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“…While titanium dioxide (TiO 2 ) has been considered the most promising photocatalyst for widespread environmental application . Zinc oxide (ZnO) is an important photocatalyst owing to its unique advantages of high reactivity, high chemical stability, biocompatibility, non‐toxicity, effective long‐term operation and inexpensive commercial availability . In comparison with TiO 2 , zinc oxide is reported to have higher photocatalytic activity .…”

Section: Introductionmentioning

confidence: 99%

“…Zinc oxide (ZnO) is an important photocatalyst owing to its unique advantages of high reactivity, high chemical stability, biocompatibility, non‐toxicity, effective long‐term operation and inexpensive commercial availability . In comparison with TiO 2 , zinc oxide is reported to have higher photocatalytic activity . However, the photocatalytic antimicrobial ability of pure TiO 2 or ZnO is valid only under UV light irradiation .…”

Section: Introductionmentioning

confidence: 99%

Disinfection of secondary treated sewage using chitosan beads coated with ZnO‐Ag nanoparticles to facilitate reuse of treated water

Chatterjee

Ghangrekar

Rao

2017

J of Chemical Tech & Biotech

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BACKGROUND: Reuse of treated wastewater is necessary to augment supply of fresh water. Secondary effluent from a sewage treatment plant was disinfected using novel synthesized ZnO-Ag-chitosan beads under visible light. RESULTS:Final most probable number (MPN)/100 mL after 1 h contact time under direct sunlight was 920 with a loading of chitosan, Zn and Ag of 0.4 mg L −1 each. Disinfection resulted from the generation of reactive oxygen species. Disinfection efficiency reduced by 10% and 20%, when the total suspended solids (TSS) concentrations in the sewage were 50 mg L −1 and 100 mg L −1 , respectively, compared with that with 30 mg L −1 . A 5% and 10% reduction in disinfection efficiency was observed when sulphide concentration in sewage was increased from 10 mg L −1 to 20 mg L −1 and 50 mg L −1 , respectively. Disinfection efficiency of the beads decreased by 10% when nitrate concentration in the sewage increased to 30 mg L −1 from zero. These novel beads had residual disinfection ability even after removal of beads from wastewater and these beads were successfully used for disinfection in four consecutive cycles. CONCLUSION: Successful disinfection of secondary sewage using chitosan beads coated with ZnO-Ag nanoparticles was established for the first time in this study to facilitate reuse of treated water.

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“…Chitosan, a non-toxic, biocompatible and abundant biopolymer has emerged as an outstanding absorbent for heavy metals, organic and inorganic pollutants [24]. Chitosan possesses high content of amino (-NH 2 ) and hydroxyl groups (-OH) present in matrix that can serve as reaction sites for immobilization of inorganic nanoparticles and adsorption of aqueous phase pollutants [25].…”

Section: Introductionmentioning

confidence: 99%

“…Chitosan possesses high content of amino (-NH 2 ) and hydroxyl groups (-OH) present in matrix that can serve as reaction sites for immobilization of inorganic nanoparticles and adsorption of aqueous phase pollutants [25]. Farzana et al synthesized zinc impregnated chitosan beads for the removal of methylene blue and rhodamine B dye [24]. Ample reports have recently been devoted to the use of chitosan for advanced treatment processes to be applied to water purification.…”

Section: Introductionmentioning

confidence: 99%

Adsorptional photocatalytic mineralization of oxytetracycline and ampicillin antibiotics using Bi2O3/BiOCl supported on graphene sand composite and chitosan

Priya

Raizada

Singh

et al. 2016

Journal of Colloid and Interface Science

138

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Visible light-driven photoactivity of zinc oxide impregnated chitosan beads for the detoxification of textile dyes

Cited by 43 publications

References 48 publications

Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes

Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes

Disinfection of secondary treated sewage using chitosan beads coated with ZnO‐Ag nanoparticles to facilitate reuse of treated water

Adsorptional photocatalytic mineralization of oxytetracycline and ampicillin antibiotics using Bi2O3/BiOCl supported on graphene sand composite and chitosan

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