scholarly journals Preparation and the Catalytic Properties of Attapulgite / TiO2 Nanocomposites

2022 ◽  
Vol 2152 (1) ◽  
pp. 012006
Author(s):  
Jianping Shang ◽  
Tao Li ◽  
Xiaoping Qin ◽  
Bin Zhao ◽  
Xuefei Li
Keyword(s):  
Methylene Blue ◽  
Degradation Mechanism ◽  
Rapid Development ◽  
Pure Water ◽  
Oxidative Degradation ◽  
Blue Dye ◽  
Dyeing Wastewater ◽  
Printing And Dyeing Wastewater ◽  
Catalytic Activities ◽  
Textile Printing

Abstract With the rapid development of industry, the discharge of textile printing and dyeing wastewater will cause serious pollution to other pure water bodies. It is imperative to deal with textile printing and dyeing wastewater. In this paper, with titanium tetrachloride as a precursor, attapulgite (ATP) / TiO2 nanocomposites were prepared by a neutralizing hydrolysis method and their catalytic activities were investigated by the oxidative degradation of methylene blue dye using ozone as oxidant. The test results showed that there were significant interactions between TiO2 and ATP support. The effects were also studied of ozone concentration, catalyst amount, reaction temperature, and initial concentration of methylene blue on the degradation rate of methylene blue catalyzed by the prepared attapulgite / TiO2 nanocomposites, and under the optimal conditions, the methylene blue could be degraded more than 90% in 30 minutes. Compared with that of pure ATP, the catalytic activities of ATP / TiO2 nanocomposites were enhenced remarkably. The degradation mechanism of methylene blue was also discussed.

scholarly journals Study on the decolourisation conditions of methylene blue by Irpex Lacteus

2021 ◽  
Vol 257 ◽  
pp. 03036
Author(s):  
Hongshi Bu ◽  
Huan Wang ◽  
Bo Zhang ◽  
Xin Dong ◽  
Jia Wang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Incubation Time ◽  
Nitrogen Sources ◽  
Blue Dye ◽  
Process Conditions ◽  
Dyeing Wastewater ◽  
Irpex Lacteus ◽  
Inoculum Level ◽  
Printing And Dyeing Wastewater ◽  
Liquid Fermentation

The fungus Irpex Lacteus is effective in decolourising methylene blue, a common dye in printing and dyeing wastewater, and it is of clear significance to investigate its optimal decolourisation process through liquid fermentation. The medium mixed with methylene blue dye was incubated with Irpex Lacteus in a constant temperature shaking flask liquid fermentation equipment, and single factors such as incubation time, temperature, shaking bed speed, dye concentration, pH, carbon and nitrogen sources were screened, and key factors were targeted orthogonal tests were carried out to optimise the best decolourisation process for Irpex Lacteus against methylene blue. The single-factor test revealed that carbon, nitrogen, pH and inoculum were the main factors influencing the decolourisation of methylene blue by Irpex Lacteus. The results of the orthogonal test showed that the decolourisation effect was best when the carbon source was sucrose, the nitrogen source was peptone, pH=3.5, the inoculum level was 7% and the incubation time was 10 days. Irpex Lacteus showed good decolourisation effect on methylene blue and the optimised process conditions provided a new direction for the treatment of printing and dyeing wastewater.

scholarly journals Treatment of simulated printing and dyeing wastewater using ozone microbubble

2021 ◽  
Vol 261 ◽  
pp. 04005
Author(s):  
Emmanuel Nkudede ◽  
Husseini Sulemana ◽  
Bo Zhang ◽  
Kaida Zhu ◽  
Shan Hu ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Methylene Blue ◽  
Removal Efficiency ◽  
Human Life ◽  
Cod Removal ◽  
Dyeing Wastewater ◽  
Flow Rates ◽  
Printing And Dyeing Wastewater ◽  
Cod Removal Efficiency ◽  
Initial Ph

Owing to its widespread and persistent usage, methylene blue (MB) is an environmental substance, mostly found in the printing and dyeing industry that raises concerns in the environment recently by posing significant threat to human life and the ecosystem as a whole. Thus, there is the need to effectively manage and treat the wastewater from these industries before reaching to the available water sources. Ozonation treatment is very efficient in treating printing and dyeing wastewater (MB) and can be greatly improved by using micro-bubble technology. Microbubble dissolution is an effective way to improve the rate of ozone mass transfer. To discover these properties, a method was used to improve the mass transfer of ozone microbubbles, which was used to effectively treat simulated printing and dyeing wastewater. We investigated the effects of pH, water temperature, ozone flow, and other conditions on the dissolution and attenuation properties of ozone in methylene blue microbubble solutions. Treatment of simulated printing and dyeing wastewater (methylene blue) was investigated under various initial pH and ozone flow rates. A catalytic exhibition was performed towards the decolorization of methylene blue (MB) concentrations and the corresponding COD removal efficiency. Ozone depletion and pH levels played key roles in MB degradation. Under high pH level of 11.01, the rate of removal of COD was 93.5%. Ozone dosage also has direct effect on COD removal efficiency and decolorization. Higher ozone flow rates, 0.4 L/min and 0.5 L/min recorded more than 94% degradation of COD thus very effective and efficient. Also, ozone flow rates 0.3 L/min, 0.4 L/min and 0.5 L/min with initial pH, 7.03, 6.63 and 6.36 decreased to 3.43, 3.49 and 3.44 after reaction processes which clearly shows that with high ozone dosage, pH reduces considerably.

scholarly journals Enhanced Photocatalytic Performance in Chromium(VI) Reduction and Dye Degradation using Sn3O4/SnS2 Nanocomposite and Mechanism Insight

2021 ◽  
Author(s):  
Gandharve Kumar ◽  
Rajkumar Dutta
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Dye Degradation ◽  
Degradation Products ◽  
Degradation Mechanism ◽  
Reaction Medium ◽  
Blue Dye ◽  
Ros Scavenging ◽  
Hydrothermal Route ◽  
Inorganic Species

Abstract Detection of residual organic and inorganic species in water bodies including drinking water has led to developing strategies for their removal. Here we report a very efficient method of photoreduction of Cr (VI) and photodegradation of methylene blue dye in aqueous medium using Z-scheme heterojunction based Sn3O4/SnS2 solar photocatalyst. The photocatalyst is synthesized by hydrothermal route and it is thoroughly characterized in terms of its structural, compositional, morphological and optical properties. About 100 % of Cr (VI) reduction in 60 min and 99.6 % of methylene blue degradation in 90 min is achieve under sunlight exposure at a photocatalytic rate of 0.066 min-1 and 0.043 min-1, respectively. The total organic carbon estimation of the post-degradation reaction medium corresponded to 85.1 % (MB) mineralization. The photocatalytic degradation is attributed to in-situ generation of reactive oxygen species (ROS) e.g., superoxide radicals, hydroxide radicals, and the role of ROS towards reduction and degradation of Cr (VI) and MB respectively, is confirmed from ROS scavenging studies. The dye degradation mechanism has been discussed by analyzing the degradation products via UPLC-Q-Tof-MS. The photocatalytic degradation of methylene blue by Sn3O4/SnS2 nanocomposites is significantly enhanced as compared to SnS2 photocatalyst, attributed to Z-scheme heterojunction and the charge carrier mobility.

Removal of methylene blue from aqueous solution using high performance calcium alginate/activated carbon membrane

2019 ◽  
Vol 32 (3) ◽  
pp. 307-321 ◽  
Author(s):  
Xiaoping Zhang ◽  
Yanhui Li ◽  
Meixiu Li ◽  
Heng Zheng ◽  
Qiuju Du ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Wastewater Treatment ◽  
Activated Carbon ◽  
Composite Membrane ◽  
Calcium Alginate ◽  
Dyeing Wastewater ◽  
Carbon Membrane ◽  
Content Type ◽  
Printing And Dyeing Wastewater ◽  
New Ideas

Purpose The purpose of this paper is to purify the wastewater in the garment industry. Design/methodology/approach The preparation of the calcium alginate (CA)/activated carbon (AC) composite membrane was achieved by vacuum freeze-drying and the cross-linking reaction between sodium alginate and CaCl2. Effective parameters in the methylene blue (MB) adsorption such as temperature, dose, contact time and pH were discussed. The adsorption properties of the composite membrane were investigated by isotherm, kinetics and thermodynamic analysis. The adsorption equilibrium data were described by the adsorption isotherm Langmuir model and the Freundlich model. The pseudo-first-order, pseudo-second-order and intra-particle diffusion equations were selected to evaluate the kinetics. The thermodynamic study described that the adsorption reaction was spontaneous and exothermic. Findings The AC/CA membrane is an efficient and powerful adsorbent to remove MB in printing and dyeing wastewater, and provides a new idea for the selection of adsorption materials for industrial printing and dyeing wastewater. Practical implications The composite membrane research on CA and AC can provide new ideas for the research of these kinds of materials. Social implications The paper contributes to its wider and convenientapplication in wastewater treatment. Originality/value Studies on the combination of CA and AC into adsorption membranes and for the removal of dyes from printing and dyeing wastewater have not been reported. A novel composite material is provided for treatment dyeing wastewater in garment production. The composite membrane research on CA and AC can provide new ideas for the research of these kinds of materials and contribute to its wider and convenient application in wastewater treatment.

Probing the photo- and electro-catalytic degradation mechanism of methylene blue dye over ZIF-derived ZnO

2019 ◽  
Vol 373 ◽  
pp. 377-388 ◽  
Author(s):  
Soumitra Payra ◽  
Swapna Challagulla ◽  
Yamini Bobde ◽  
Chanchal Chakraborty ◽  
Balaram Ghosh ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Degradation Mechanism ◽  
Catalytic Degradation ◽  
Blue Dye ◽  
Methylene Blue Dye

scholarly journals Catalytic degradation of methylene blue in aqueous solutions over Ni- and Co- oxide systems

2011 ◽  
Vol 9 (6) ◽  
pp. 1000-1007 ◽  
Author(s):  
Maria Stoyanova ◽  
Stoyanka Christoskova
Keyword(s):  
Methylene Blue ◽  
Aqueous Solutions ◽  
Degradation Kinetics ◽  
Oxidative Degradation ◽  
Oxide System ◽  
Catalytic Degradation ◽  
Blue Dye ◽  
Oxide Systems ◽  
First Order Kinetics ◽  
Degradation Reaction

AbstractThe oxidative catalytic degradation of the cationic dye methylene blue (MB) with NaOCl in aqueous solutions was studied using individual and iron modified Ni- and Co-oxide systems as catalysts. The adsorption extent and the contribution of the uncatalyzed oxidation on the overall degree of MB were determined. The results indicate that methylene blue—a representative of a class of dyestuffs resistant to biodegradation—could be successfully decolorized and degraded using nickel and cobalt oxide catalysts at room temperature. The highest catalytic activity manifests in the Co-oxide system which is consistent with the adsorption data. The oxidative degradation reaction proceeds via first-order kinetics. Temperature has a relatively small effect on the methylene blue degradation kinetics. The results obtained reveal that the catalysts investigated are suitable for oxidative destruction of methytlene blue dye in wastewaters.

scholarly journals Preparation of GO/PAM Continuous Adsorption Medium and its Dynamic Adsorption Properties for Methylene Blue

2020 ◽  
Vol 213 ◽  
pp. 01031
Author(s):  
Dagang Li ◽  
Zhiwen Wang
Keyword(s):  
Methylene Blue ◽  
Exchange Resin ◽  
Amorphous Region ◽  
Ion Exchange Resin ◽  
Dynamic Adsorption ◽  
Dyeing Wastewater ◽  
Continuous Adsorption ◽  
Printing And Dyeing Wastewater ◽  
Adsorption Capacities ◽  
One Step

A continuous and structured porous adsorbent named GO/PAM was synthesised by one-step copolymerization of graphene oxide (GO) and acrylamide (AM) in amorphous region initiated by redox agent consisting of hydrogen peroxide (H2O2) and ascorbic acid (VC) at -20°C. The dynamic adsorption characteristics of methylene blue (MB) in GO/PAM structured adsorption medium were investigated. With the introduction of GO which rich in —OH and —COOH groups, the adsorption capacities were 178.65 mg/g~201.58 mg/g. Structured continuous adsorption medium was prepared by one-step polymerization of crystallization, in order to replace traditional bulk resin and ion exchange resin in the treatment of printing and dyeing wastewater.

scholarly journals Optimization of Process Parameters for Enhanced Degradation of Methylene Blue by Trough Ultrasonic

2022 ◽  
Vol 2152 (1) ◽  
pp. 012027
Author(s):  
Yong-guang Bi ◽  
Yu-hong Zheng ◽  
Li Tang ◽  
Juan Guo ◽  
Shao-Qi Zhou
Keyword(s):  
Methylene Blue ◽  
Process Conditions ◽  
Ultrasonic Power ◽  
Test Results ◽  
Dyeing Wastewater ◽  
Optimal Process ◽  
Printing And Dyeing Wastewater ◽  
Optimization Of Process Parameters ◽  
Large Discharge ◽  
Enhanced Degradation

Abstract Due to the complex quality and the large discharge of printing and dyeing wastewater, it will pollute the environment and affect human health. Therefore, how to use efficient and inexpensive treatment methods to treat printing and dyeing wastewater has become an urgent problem to be solved. At present, most printing and dyeing wastewater contains methylene blue pollutants. Based on the previous research in this article, the process conditions for the enhanced degradation of methylene blue by trough ultrasound are optimized. Orthogonal test results show that the optimal process parameter for the degradation of methylene blue by trough ultrasonic is pH 12.70, and the initial With a concentration of 10.00mg/L and an ultrasonic power of 200W, under the above optimal process conditions, the degradation rate of methylene blue is 77.95%; Ultrasound improves the rapid degradation of methylene blue through mechanisms such as cavitation, thermal and mechanical effects. This process can be used for the industrial degradation of methylene blue. The application provides a research basis.

scholarly journals Exploration of Methylene Blue Degradation over ZnO Nanorods Mechanism using Scavenging Reagents

2021 ◽  
Vol 37 (3) ◽  
pp. 609-618
Author(s):  
Monira G. Ghoniem ◽  
Sarra A. Talab ◽  
Abueliz K. Modwi ◽  
Kamal K. Taha
Keyword(s):  
Methylene Blue ◽  
Degradation Mechanism ◽  
Zno Nanorods ◽  
Nitrogen Adsorption ◽  
Analysis Data ◽  
Bandgap Energy ◽  
Precipitation Process ◽  
Blue Dye ◽  
Zno Nanostructure ◽  
Hierarchical Porous

Hierarchical porous flower-like ZnO structures containing ZnO nanorods were successfully synthesizedby precipitation process. The structure containing high aspect ratio nanorods was revealed by scanning electron microscopy(SEM). The EDS analysis revealed the ZnO nanostructures formation as confirmed by the Zn and O peaks. The Fourier-transform infrared spectroscopy(FTIR) spectrum indicated the Zn – O bond vibrational frequency. The typical hexagonal wurtzite ZnO nanostructure with 15 nm crystallite size and the characteristic parameters was perceived from the X-ray diffraction(XRD) data. A 10.13 m².g-1 surface area, 10.05 cm3/g pore volume and 18.25 nm pore diameter were estimated using nitrogen adsorption analysis. Bandgap energy of 3.229 eV was calculated from the optical analysis data. Under ultraviolet light irradiation, the prepared nanoparticles has effectively decolorized the methylene blue dye. The reaction obeyed the pseudo-first-order kinetics, and the degradation mechanism was proposed using radicals scavengers to determine the species involved in the photodegradation process such as isopropanol, p-benzoquinone, and dimethyl sulfoxide. The reactive oxygen atom in the mechanism of photodegradation , and the recyclability of ZnO photocatalysts were studied.

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