A novel scheme for the utilization of Cu slag flotation tailings in preparing internal electrolysis materials to degrade printing and dyeing wastewater

Zhai, Qilin; Wang, Changtao; Wen, Xiaofei; Li, Xiong; Sun, Wei

doi:10.1016/j.jhazmat.2021.127537

Cited by 37 publications

(9 citation statements)

References 60 publications

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“…As shown in Figure d–i, after peak deconvolution, the Fe 2p 3/2 peak at a binding energy of 710.4 eV was attributed to Fe 2+ . Besides, both the Fe 2p 3/2 peak (711.5 eV) and the Fe 2p 3/2 peak (714.5 eV) were assigned to Fe 3+ with Fe 2p 3/2 . − Notably, an additional pair of minor peaks of Fe 2p 3/2 (707.3 eV) and Fe 2p 1/2 (721.3 eV) appeared, which is unique to monoclinic pyrrhotite (Fe 7 S 8 ). , Additionally, the remaining binding energy positions of the fitted peaks are considered satellite peaks of Fe. , The increased oxidation ability (Figure e) reveals significant disappearance of the distinctive peaks of monoclinic pyrrhotite (Fe 2p 3/2 at 707.3 eV). This indicates that the accompanying sulfur of monoclinic pyrrhotite was oxidized to thiosulfate (0.23 M) and changed the solution characteristics (80 °C, 4 h), resulting in the transformation of Fe(II)–S to Fe(II)–O, Fe(II)–S n , Fe(III)–O/OH species, etc .…”

Section: Results and Discussionmentioning

confidence: 99%

Process Mechanism for Production of Green Lixiviant Thiosulfate at Atmospheric Pressure

Yang

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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The serious environmental pollution and human health risks caused by highly toxic cyanide have necessitated the search for a nontoxic and alternative lixiviant. However, conventional chemical thiosulfate suffers from high consumption, which makes the commercialization of non-cyanide green extraction of precious metals difficult. Therefore, the development of green and low-energy technology for producing thiosulfate from sulfur-containing materials is of high academic and industrial interest. Herein, the process mechanism of producing thiosulfate at atmospheric pressure was first elucidated to facilitate the production of sufficient thiosulfate. By precisely regulating significant parameters, the concentration of thiosulfate can be increased to up to 0.32 M under optimal conditions. Furthermore, the conversion characteristics of sulfur and iron in this process are as follows:and Fe(II)−S 2 → Fe(II)−S → Fe(II)−O/S n → Fe(III)−O/OH and Fe(III)−SO 3 /SO 4 . Importantly, the sustainable existence of metastable thiosulfate is achieved under the oxidation system designed, preventing the peroxidation of S 2 O 3 2− into S 4 O 6 2− and S 3 O 6 2−. This fruitful research provides valuable scientific insights for promoting the commercial application of thiosulfate with lower cost and environmental impact in the precious metal extraction industry.

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Section: Results and Discussionmentioning

confidence: 99%

Process Mechanism for Production of Green Lixiviant Thiosulfate at Atmospheric Pressure

Yang

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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“…Several methods, such as oxidation process, 19 membrane filtration technique, 20,21 microbial technologies, 22,23 bio‐electrochemical degradation, 24,25 flotation, 26 coagulation, 27 flocculation, 28 absorption, 29 adsorption, 30 photodegradation, 31–33 thermal degradation, 34 and so on, are being used for the degradation of the dyes. However, due to the accessibility and simplicity of catalytic materials, photocatalytic degradation has garnered considerable interest 35–39 .…”

Section: Introductionmentioning

confidence: 99%

Poly(vinylidene fluoride‐hexafluoropropylene)/mesoporous graphitic carbon nitride composite membranes for photocatalytic methylene blue degradation and sensing applications

Sharma,

Kumar,

Yadav

2023

Polymer Engineering & Sci

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In this work, poly(vinylidene fluoride‐hexafluoropropylene) (PVDF‐HFP)/mesoporous graphitic carbon nitride (mpg‐C3N4) composite fiber web have been prepared and characterized for photocatalytic methylene blue (MB) degradation and sensing applications. The electrospinning technique, operating at a flow rate of 1 mL/h and a voltage of 15 kV, was utilized to prepare the composite membranes of PVDF‐HFP with the uniform distribution of the mpg‐C3N4. The composite web demonstrated outstanding photocatalytic activity for the degradation of MB, reaching a quick 68% drop in MB concentration in just 45 min. The composite web furthermore worked as a sensor for MB detection. After MB exposure, the film resistance was increased, suggesting its potential as a chemiresistive sensor. The maximum resistivity of PVDF‐HFP/mpg‐C3N4 composites was found to be 90 Ω·m at 2% concentration of MB. The MB molecules' adsorption on the surface of the composite web and the existence of photocatalytic byproducts on the surface may be responsible for this shift in resistance. This dual functionality highlights the adaptability and potential of the PVDF‐HFP/mpg‐C3N4 composite web as a versatile material for environmental sensing and cleanup. This research presents a comprehensive approach to the synthesis, characterization, and evaluation of such flexible membranes for potential applications as self‐cleaning devices and chemiresistive sensor.Highlights PVDF‐HFP/mpg‐C3N4 composite membranes act as an efficient material for MB degradation (68%) with visible light exposure. mpg‐C3N4 plays the role of active material in degradation. PVDF‐HFP/mpg‐C3N4 composite membrane also act as sensors for MB detection. Composite membrane becomes chemiresistive due to notable resistivity changes with MB concentration.

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“…Printing and dyeing wastewater is a type of industrial wastewater that is very difficult to treat, characterized by high colority, complex composition and poor biodegradability [1]. Technologies including physical-chemical methods, biological methods and the combination of these methods have been applied for its treatment [2]. Due to cost competitivity, the anaerobic technology has maintained attention from scientists and engineers, which can degrade refractory macromolecular organic pollutants, such as colorant anthraquinone and azo dyes, into small molecular ones, so as to improve the biodegradability of wastewater [3].…”

Section: Introductionmentioning

confidence: 99%

Pilot-Scale Anaerobic Treatment of Printing and Dyeing Wastewater and Performance Prediction Based on Support Vector Regression

Wang

Chen

et al. 2022

Fermentation

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Printing and dyeing wastewater is characterized with complex water quality and poor biodegradability. In this study, a pilot-scale anaerobic baffled reactor (ABR) with packing was verified to effectively degrade the complex organic pollutants in the wastewater through the hydrolysis and acidification of anaerobic microorganisms. At a hydraulic retention time (HRT) of 12 h and an organic loading rate (OLR) of 2.0–2.5 kg COD/(m3·d), the ABR stabilized the fluctuation range of pH and achieved an average colority removal rate of 10.5%, which provided favorable conditions for subsequent aerobic treatment. During the early operation period, the reactor increased the alkalinity of the wastewater; after 97 days of operation, the volatile fatty acid (VFA) content in the wastewater decreased. To demonstrate the suitability of the support vector regression (SVR) technology in predicting the performance of the reactor, two SVR algorithms with three kernel functions were employed to relate the chemical oxygen demand (COD) removal rate to its influencing factors, and the predictions of both the training and validation groups agreed with the measurements. The results obtained from this study can contribute to the design and optimal operation of the anaerobic treatment project of the industrial wastewater treatment plant.

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A novel scheme for the utilization of Cu slag flotation tailings in preparing internal electrolysis materials to degrade printing and dyeing wastewater

Cited by 37 publications

References 60 publications

Process Mechanism for Production of Green Lixiviant Thiosulfate at Atmospheric Pressure

Process Mechanism for Production of Green Lixiviant Thiosulfate at Atmospheric Pressure

Poly(vinylidene fluoride‐hexafluoropropylene)/mesoporous graphitic carbon nitride composite membranes for photocatalytic methylene blue degradation and sensing applications

Pilot-Scale Anaerobic Treatment of Printing and Dyeing Wastewater and Performance Prediction Based on Support Vector Regression

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