Adsorption characteristics of Direct Red 23 azo dye onto powdered tourmaline

Liu, Na; Wang, Hang; Weng, Chih‐Huang; Hwang, Chi-Chin

doi:10.1016/j.arabjc.2016.04.010

Cited by 68 publications

(26 citation statements)

References 59 publications

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“…Narayanasamy and Murugesan [ 19 ] and Natarajan, et al [ 20 ], reported photocatalytic degradation of yellow dye using TiO 2 thin films under visible light, where the degradation efficiency decreased with an increase in catalyst load. Similarly, other studies have exposed TiO 2 photocatalysts to UV light for discoloration of different types of dyes in wastewater such as Direct Red 23, Toluidine Blue, Safranin Orange, and Methylene Blue [ 21 , 22 , 23 ]. Apart from the catalyst load, several other factors which includes pH, temperature, wavelength, reaction time, and the pollutant concentration can influence the photocatalytic efficiency [ 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Response Surface Methodology: Photocatalytic Degradation Kinetics of Basic Blue 41 Dye Using Activated Carbon with TiO2

et al. 2021

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Water decontamination still remains a major challenge to some developing countries not having centralized wastewater systems. Therefore, this study presents the optimization of photocatalytic degradation of Basic Blue 41 dye in an aqueous medium by an activated carbon (AC)-TiO2 photocatalyst under UV irradiation. The mesoporous AC-TiO2 synthesized by a sonication method was characterized by X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectroscopy for crystal phase identification and molecular bond structures, respectively. The efficiency of the AC-TiO2 was evaluated as a function of three input variables viz. catalyst load (2–4 g), reaction time (15–45 min) and pH (6–9) by using Box-Behnken design (BBD) adapted from response surface methodology. Using color and turbidity removal as responses, a 17 run experiment matrix was generated by the BBD to investigate the interaction effects of the three aforementioned input factors. From the results, a reduced quadratic model was generated, which showed good predictability of results agreeable to the experimental data. The analysis of variance (ANOVA), signposted the selected models for color and turbidity, was highly significant (p < 0.05) with coefficients of determination (R2) values of 0.972 and 0.988, respectively. The catalyst load was found as the most significant factor with a high antagonistic impact on the process, whereas the interactive effect of reaction time and pH affected the process positively. At optimal conditions of catalyst load (2.6 g), reaction time (45 min), and pH (6); the desirability of 96% was obtained by a numerical optimization approach representing turbidity removal of 93% and color of 96%.

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Section: Introductionmentioning

confidence: 99%

Response Surface Methodology: Photocatalytic Degradation Kinetics of Basic Blue 41 Dye Using Activated Carbon with TiO2

et al. 2021

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“…Currently, biotechnology and physicochemical methods are commonly used for dyeing wastewater treatment . Among the physicochemical technologies, advanced oxidation technologies, such as activated persulphate oxidation, have been developed and successfully used for the degradation of colorants . Compared with physicochemical methods, biotechnology is more efficient for organic pollutant reduction, providing a better developed application in the treatment of textile dyeing wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…2,3 Among the physicochemical technologies, advanced oxidation technologies, such as activated persulphate oxidation, have been developed and successfully used for the degradation of colorants. [4][5][6][7][8] Compared with physicochemical methods, biotechnology is more efficient for organic pollutant reduction, providing a better developed application in the treatment of textile dyeing wastewater. However, these conventional treatment technologies also have their own shortcomings that are difficult to overcome, such as the consumption of additional chemical reagents, a low decolorisation rate and poor desalination efficiency.…”

Section: Introductionmentioning

confidence: 99%

Dye removal using hydrophobic polyvinylidene fluoride hollow fibre composite membrane by vacuum membrane distillation

Feng

Shi

et al. 2019

Coloration Technology

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Hydrophobic polyvinylidene fluoride (PVDF) hollow fibre composite membranes were prepared by the dilute solution coating process to build a special surface structure that was similar to the dual micro‐nano structure on the lotus leaf. Poly(vinylidene fluoride‐co‐hexafluoropropene) was chosen as the hydrophobic polymer candidate in dilute solution. Membrane morphology and surface hydrophobicity were evaluated by scanning electron microscopy and dynamic water contact angle measurement. The prepared PVDF hollow fibre membranes were employed to separate dyes (Congo Red and Methylene Blue) from water by vacuum membrane distillation. The effects of operational conditions (feed temperature, vacuum pressure and feed flow rate) on the vacuum membrane distillation performance of different PVDF membranes were investigated. The results indicated that the water contact angle values of PVDF composite membrane surfaces improved from 93.6° to 130.8°, which was mainly attributed to the formation of micro‐nano rods. This structure was similar to the dual micro‐nano structure on the lotus leaf. Under test feed temperature, vacuum pressure and feed flow rate conditions, the dye rejection rate of Congo Red and Methylene Blue by the hydrophobic PVDF hollow fibre membrane remained above 99.5% and 99%, which was higher than that of the pristine PVDF membrane (99% and 98%, respectively). In addition, the hydrophobic PVDF hollow fibre composite membrane showed higher permeation flux under different conditions compared with the pristine PVDF membrane, which was attributed to membrane surface hydrophobicity and the electrostatic interactions between dyes and the PVDF membrane surface.

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“…After the cleaving process, the resulting aromatic amines such as benzidine, 4-aminobiphenyl, and 2-naphthylamine are highly toxic and carcinogenic [4]. During the textile dyeing process, 10-25% of textile dyes are lost and 2-20% are directly imparted into the local environment as contaminated effluents [5].…”

Section: Introductionmentioning

confidence: 99%

Nickel-Iron Alloy Nanoparticle Characteristics Pre- and Post-Reaction With Orange G

Foster

Acharya

Abolhassani

et al. 2021

IEEE Open J. Nanotechnol.

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Bimetallic nanoparticles comprised of iron and nickel were synthesized, characterized, and evaluated to optimize the ideal metal ratio for azo dye removal from water systems. Results show that changing the molar ratio of nickel to iron caused different removal rates, as well as the extent of overall elimination of azo dye from water. Lower molar ratios, from Ni1Fe10 to Ni2.5Fe10, exhibited a higher removal efficiency of 80-99%. Higher concentrations of Ni in the catalyst, from Ni3Fe10 to Ni5Fe10, resulted in 70-90% removal. The lower molar ratios of Ni exhibited a consistent removal rate of 0.11 g/L/min, while the higher molar ratios of Ni displayed varying removal rates of 0.1-0.05 g/L/min. A second order kinetic model was fit to the first twenty minutes of the reaction for all nickel to iron compositions, where there is a decrease in rate constant with an increase in molar ratio. During the last forty minutes of reaction, azo dye removal fit a zero order kinetic model. All as-synthesized nanoparticle samples were found to be structurally disordered based on the lack of distinct peaks in XRD spectra. Post-reaction samples were found to have Fe2O3 and FeOOH cubic peaks.

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Adsorption characteristics of Direct Red 23 azo dye onto powdered tourmaline

Cited by 68 publications

References 59 publications

Response Surface Methodology: Photocatalytic Degradation Kinetics of Basic Blue 41 Dye Using Activated Carbon with TiO2

Response Surface Methodology: Photocatalytic Degradation Kinetics of Basic Blue 41 Dye Using Activated Carbon with TiO2

Dye removal using hydrophobic polyvinylidene fluoride hollow fibre composite membrane by vacuum membrane distillation

Nickel-Iron Alloy Nanoparticle Characteristics Pre- and Post-Reaction With Orange G

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