Sunlight-induced enhanced photocatalytic reduction of chromium (VI) and photocatalytic degradation of methylene blue dye and ciprofloxacin antibiotic by Sn3O4/SnS2 nanocomposite

Kumar, Gandharve; Dutta, Ruma

doi:10.1007/s11356-022-19853-0

Cited by 26 publications

(12 citation statements)

References 52 publications

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“…According to the reaction pathways given above, MB removal in the EO system could be assumed to follow pseudo-first order kinetics (eq 6) 49 = C C kt ln( / ) t 0 (6) where C 0 and C t are the initial and time = t concentrations of MB in mg/L, respectively, k is the rate constant in min −1 , and t is time in min.…”

Section: Introductionmentioning

confidence: 59%

“… 4 On the other hand, a large number of azo dyes and their breakdown products, such as component metals and chlorine, are toxic to or mutagenic for marine life. 5 , 6 Methylene blue (MB) is one of the most frequently found organic dyes in textile wastewater. 7 − 9 Several adverse effects have been reported at various doses based on exposure concentration, including skin desquamation and hemolytic anemia at 2–4 mg/kg, hemolysis, fever, chest pain, nausea, and vomiting at 7 mg/kg, hypotension at 20 mg/kg, and bluish discoloration at 80 mg/kg.…”

Section: Introductionmentioning

confidence: 99%

“…The textile industry, as one of the most water-intensive industries, has exacerbated the water quality problem by utilizing a variety of synthetic dyes and discharging large amounts of highly colored wastewater, in addition to other minor issues such as solid waste management. − Direct discharge of highly colored textile wastewater is an aesthetically unpleasant situation, but it also negatively impacts aquatic life by obstructing light penetration for photosynthetic function in plants . On the other hand, a large number of azo dyes and their breakdown products, such as component metals and chlorine, are toxic to or mutagenic for marine life. , Methylene blue (MB) is one of the most frequently found organic dyes in textile wastewater. − Several adverse effects have been reported at various doses based on exposure concentration, including skin desquamation and hemolytic anemia at 2–4 mg/kg, hemolysis, fever, chest pain, nausea, and vomiting at 7 mg/kg, hypotension at 20 mg/kg, and bluish discoloration at 80 mg/kg . As environmental regulations have become strict considering those side effects, MB in effluents must be treated prior to discharge.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Degradation of Methylene Blue by a Flexible Graphite Electrode: Techno-Economic Evaluation

et al. 2022

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In this study, electrochemical removal of methylene blue (MB) from water using commercially available and low-cost flexible graphite was investigated. The operating conditions such as initial dye concentration, initial solution pH, electrolyte dose, electrical potential, and operating time were investigated. The Box-Behnken experimental design (BBD) was used to optimize the system’s performance with the minimum number of tests possible, as well as to examine the independent variables’ impact on the removal efficiency, energy consumption, operating cost, and effluent MB concentration. The electrical potential and electrolyte dosage both improved the MB removal efficiency, since increased electrical potential facilitated production of oxidizing agents and increase in electrolyte dosage translated into an increase in electrical current transfer. As expected, MB removal efficiency increased with longer operational periods. The combined effects of operating time–electrical potential and electrical potential–electrolyte concentration improved the MB removal efficiency. The maximum removal efficiency (99.9%) and lowest operating cost (0.012 $/m 3 ) were obtained for initial pH 4, initial MB concentration 26.5 mg/L, electrolyte concentration 0.6 g/L, electrical potential 3 V, and operating time 30 min. The reaction kinetics was maximum for pH 5, and as the pH increased the reaction rates decreased. Consequent techno-economic assessment showed that electrochemical removal of MB using low-cost and versatile flexible graphite had a competitive advantage.

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Section: Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Degradation of Methylene Blue by a Flexible Graphite Electrode: Techno-Economic Evaluation

et al. 2022

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“…The role of specific ROS toward photocatalytic degradations of TC and CIP was studied by the radical scavenging method. 21 In this regard, ammonium oxalate (AO, 1.0 mM), 67 isopropyl alcohol (IPA,1.0 mM), 68 sodium azide (NaN 3 , 1.0 mM), 69 and chloroform (1.0 mM) 70 were added as quenchers in the reaction medium comprising 2-ACCN/ Bi 2 WO 6 as the photocatalyst and TC/CIP for scavenging photogenerated holes (h + ), hydroxyl radicals (OH • ), singlet oxygen ( 1 O 2 ), and superoxide radicals (O 2 −• ), respectively. It is noted that the photocatalytic degradations of TC and CIP were significantly inhibited in the batch spiked with chloroform for O 2 −• radical scavenging (Figure 9c, d).…”

Section: Mechanism Of Photocatalytic Degradation By Accn/bi 2 Womentioning

confidence: 99%

Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi₂WO₆ Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin

Bisht

Kumar

Dutta

2022

Ind. Eng. Chem. Res.

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A bismuth tungstate (Bi 2 WO 6 ) nanoplate surface decorated with amine-functionalized crystalline carbon nanodots (ACCN) is developed as a sunlight responsive photocatalyst for degradation of tetracycline and ciprofloxacin antibiotics. The photocatalyst, named ACCN/Bi 2 WO 6 , has been thoroughly characterized to elucidate its structural, morphological, textural, and compositional aspects. The crystalline carbon nanodots are synthesized by hydrothermal treatment of ortho-phenylenediamine with a zwitterionic L-alanine, which offered doping of a large number of nitrogen atoms. Because of these features, compared to pristine Bi 2 WO 6 , the optimized batch of the photocatalyst prepared with 2 wt % ACCN (named 2-ACCN/Bi 2 WO 6 ) exhibited significantly enhanced degradation of tetracycline (96%) and ciprofloxacin (95%) within 75 min of sunlight exposure. The corresponding photocatalytic degradation rates are 0.030 and 0.027 min −1 , respectively. The mechanism involved in photocatalytic degradation is addressed in the light of ( a) enhanced absorption of sunlight by 2-ACCN/Bi 2 WO 6 , (b) favorable Z-scheme-like band positions of Bi 2 WO 6 and the HOMO−LUMO levels of ACCN, (c) large photocurrent density, (d) inhibition of charge carrier recombination and formation of reactive oxygen species (ROS), (e) in situ generation of a superoxide radical anion (O 2 −• ), confirmed by specific ROS scavenging studies, and (f) identification of intermediate products by ultraperformance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry.

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“…In view of this, different treatment approaches have been used to remove dyes. Some of the methods that have been reported so far include ozonation, chlorination, photo-Fenton, electrochemical oxidation, reverse osmosis, photocatalysis and adsorption [Thangavel & Venugopal 2014, Kumar & Dutta 2022. Adsorption is a simple, cost-effective, and promising technology for removing dye material from wastewater since inexpensive adsorbents with high adsorption capacity are widely available [De Gisi et al 2016].…”

Section: Introductionmentioning

confidence: 99%

Removal of Methylene Blue Dye by Metal Free Adsorption and Photodegradation Method Using Different Reduction Grades of Graphene Oxide

Mahich

Saini

Aggarwal

et al. 2022

Preprint

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Organic pollutant and dyes released into the environment by industries have been highly harmful and toxic for humans as well as for the environment. Graphene oxide (GO) and its reduction form, one of the allotropes of carbon family, were investigated for the removal of pollutant dyes. GO nano-powder was synthesized using an improved version of Hummer’s method and further thermally reduced at different temperatures 125, 150, 175, and 200 °C in the vacuum ambient. An intense (002) diffraction peak was observed at 2θ=9.136° for the pristine GO in the X-ray diffraction spectra which is gradually shifted towards the higher angles with the reduction, and it disappeared if the GO sample reduced at 200°C. I D /I G ratio for GO nano-powder in the Raman spectra decreased from 0.94 to 0.76 due to reduction. GO shows a characteristic absorption band at 3395 cm -1 in Fourier transform infra-red spectra corresponding to stretching of hydroxyl (–OH) group, this peak is flattened with the thermal reduction but not eliminated completely. The band gap of pristine GO significantly reduced from 2.31 to 0.73 eV with the reduction as measured by UV-Vis diffuse reflectance spectrophotometer. Dye adsorption and photocatalytic degradation behaviour of the pristine GO and reduced graphene oxides (rGOs) was examined towards methylene blue dye for 10 mg of GO/rGOs powder in 50 ml of 50 ppm solution by UV-Vis absorption spectroscopy. Pristine GO showed potential adsorption capacity and dye was degraded up to 85.78% within 15 minutes and around 97% after 4 hrs. Meanwhile, highest 47.58% photocatalytic degradation of Methylene blue was achieved for the rGO sample reduced at 150°C in the presence of visible light of 100 watt.

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Sunlight-induced enhanced photocatalytic reduction of chromium (VI) and photocatalytic degradation of methylene blue dye and ciprofloxacin antibiotic by Sn3O4/SnS2 nanocomposite

Cited by 26 publications

References 52 publications

Electrochemical Degradation of Methylene Blue by a Flexible Graphite Electrode: Techno-Economic Evaluation

Electrochemical Degradation of Methylene Blue by a Flexible Graphite Electrode: Techno-Economic Evaluation

Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi₂WO₆ Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin

Removal of Methylene Blue Dye by Metal Free Adsorption and Photodegradation Method Using Different Reduction Grades of Graphene Oxide

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Sunlight-induced enhanced photocatalytic reduction of chromium (VI) and photocatalytic degradation of methylene blue dye and ciprofloxacin antibiotic by Sn3O4/SnS2 nanocomposite

Cited by 26 publications

References 52 publications

Electrochemical Degradation of Methylene Blue by a Flexible Graphite Electrode: Techno-Economic Evaluation

Electrochemical Degradation of Methylene Blue by a Flexible Graphite Electrode: Techno-Economic Evaluation

Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi2WO6 Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin

Removal of Methylene Blue Dye by Metal Free Adsorption and Photodegradation Method Using Different Reduction Grades of Graphene Oxide

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Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi₂WO₆ Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin