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Fabrication of PbO₂/PVDF/CC Composite and Employment for the Removal of Methyl Orange.

ABSTRACT: The in situ electrochemical oxidation process has received considerable attention for the removal of dye molecules and ammonium from textile dyeing and finishing wastewater. Nevertheless, the cost and durability of the catalytic anode have seriously limited industrial applications of this technique. In this work, the lab-based waste polyvinylidene fluoride membrane was employed to fabricate a novel lead dioxide/polyvinylidene fluoride/carbon cloth composite (PbO₂/PVDF/CC) via integrated surface coating and electrodeposition processes. The influences of operating parameters (pH, Cl^- concentration, current density, and initial concentration of pollutant) on the oxidation efficiency of PbO₂/PVDF/CC were evaluated. Under optimal conditions, this composite achieves a 100% decolorization of methyl orange (MO), 99.48% removal of ammonium, and 94.46% conversion for ammonium-based nitrogen to N₂, as well as an 82.55% removal of chemical oxygen demand (COD). At the coexistent condition of ammonium and MO, MO decolorization, ammonium, and COD removals still remain around 100%, 99.43%, and 77.33%, respectively. It can be assigned to the synergistic oxidation effect of hydroxyl radical and chloride species for MO and the chlorine oxidation action for ammonium. Based on the determination of various intermediates, MO is finally mineralized to CO₂ and H₂O, and ammonium is mainly converted to N₂. The PbO₂/PVDF/CC composite exhibits excellent stability and safety.

SUBMITTER: Song L

PROVIDER: S-EPMC10053905 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature

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Fabrication of PbO<sub>2</sub>/PVDF/CC Composite and Employment for the Removal of Methyl Orange.

Song Laizhou L Liu Cuicui C Liang Lifen L Ma Yalong Y Wang Xiuli X Ma Jizhong J Li Zeya Z Yang Shuqin S

Polymers 20230315 6

The in situ electrochemical oxidation process has received considerable attention for the removal of dye molecules and ammonium from textile dyeing and finishing wastewater. Nevertheless, the cost and durability of the catalytic anode have seriously limited industrial applications of this technique. In this work, the lab-based waste polyvinylidene fluoride membrane was employed to fabricate a novel lead dioxide/polyvinylidene fluoride/carbon cloth composite (PbO<sub>2</sub>/PVDF/CC) via integrat ...[more]

PMID: 36987240

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Project description:(1) Background: A comparative research study to remove Congo Red (CR) and Methyl Orange (MO) from single and binary solutions by adsorption onto cobalt ferrite (CoFe2O4) and cobalt ferrite-chitosan composite (CoFe2O4-Chit) prepared by a simple coprecipitation method has been performed. (2) Methods: Structural, textural, morphology, and magnetic properties of the obtained magnetic materials were examined by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, N2 adsorption-desorption analysis, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and magnetic measurements. The optimal operating conditions of the CR and MO removal processes were established in batch experiments. The mathematical models used to describe the processes at equilibrium were Freundlich and Langmuir adsorption isotherms. (3) Results: Cobalt ferrite-chitosan composite has a lower specific surface area (SBET) and consequently a lower adsorption capacity than cobalt ferrite. CoFe2O4 and CoFe2O4-Chit particles exhibited a superparamagnetic behavior which enabled their efficient magnetic separation after the adsorption process. The research indicates that CR and MO adsorption onto prepared magnetic materials takes place as monolayer onto a homogeneous surface. According to Langmuir isotherm model that best fits the experimental data, the maximum CR/MO adsorption capacity is 162.68/94.46 mg/g for CoFe2O4 and 15.60/66.18 mg/g for CoFe2O4-Chit in single solutions. The results of the kinetics study revealed that in single-component solutions, both pseudo-first-order and pseudo-second-order kinetics models represent well the adsorption process of CR/MO on both magnetic adsorbents. In binary solutions, adsorption of CR/MO on CoFe2O4 better follows the pseudo-second-order kinetics model, while the kinetic of CR/MO adsorption on CoFe2O4-Chit is similar to that of the dyes in single-component solutions. Acetone and ethanol were successfully used as desorbing agents. (4) Conclusions: Our study revealed that CoFe2O4 and CoFe2O4-Chit particles are good candidates for dye-contaminated wastewater remediation.

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Fabrication of PbO₂/PVDF/CC Composite and Employment for the Removal of Methyl Orange.

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Fabrication of PbO<sub>2</sub>/PVDF/CC Composite and Employment for the Removal of Methyl Orange.

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Fabrication of PbO2/PVDF/CC Composite and Employment for the Removal of Methyl Orange.

Publications

Fabrication of PbO<sub>2</sub>/PVDF/CC Composite and Employment for the Removal of Methyl Orange.

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OmicsDI is part of the ELIXIR infrastructure

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Fabrication of PbO₂/PVDF/CC Composite and Employment for the Removal of Methyl Orange.