A review on advances in green treatment of glycerol waste with a focus on electro-oxidation pathway

Ahmad, Muhammad Sheraz; Hasbi, Ab. Rahim Mohd; Alqahtani, Tariq; Witoon, Thongthai; Lim, Jun-Wei; Cheng, Chin Kui

doi:10.1016/j.chemosphere.2021.130128

Cited by 61 publications

(38 citation statements)

References 253 publications

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“…Compared with chemical flocculant, electrocoagulation (EC) and electro-oxidation (EO) technologies have been proven to effectively remove humic acid and other dissolved organic matter (DOM) with many advantages, such as less sludge, strong floc adsorption capacity, and low operating cost (Yunny et al 2010;Ahmad et al 2021). The filter cake layer formed by flocs protects the surface of the membrane from direct contact with pollutants and at the same time, macromolecular organic matter is converted into low molecular weight, which can reduce membrane fouling.…”

Section: Introductionmentioning

confidence: 99%

Effects of electroflocculation/oxidation pretreatment on the fouling characteristics of ultrafiltration membranes

Wang

Liao

et al. 2022

Water Science and Technology

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In order to reduce the membrane pollution of ultrafiltration caused by natural organic matter and improve the treatment efficiency, electro-flocculation/oxidation is used as the pre-membrane treatment method. The membrane specific flux attenuation characteristics was compared and analyzed under the conditions of direct ultrafiltration and electro-flocculation/oxidation-ultrafiltration. Combined with the analysis of the reversibility of membrane fouling, the mechanism of electro-flocculation/oxidation pretreatment to alleviate ultrafiltration membrane fouling was evaluated, and the membrane pore clogging model was used to fit the fouling law. The results show that, in the continuously fed filtration experiment, the electro-flocculation/oxidation process involved in the pretreatment and the direct ultrafiltration membrane filtration decreased the ultrafiltration membrane flux to 79.1% and 28.5%, respectively. The reversible resistance generated by ultrafiltration and electro-flocculation/oxidation-ultrafiltration processes accounted for 37.70% and 62.26% of their total pollution resistance, whereas the irreversible resistance generated accounted for 47.30% and 12.40% respectively. Meanwhile, the direct correlation between the the flux dropped and complete clogging became less than that of ultrafiltration process. The pretreatment significantly strengthened irreversible fouling resistance of the membrane pores. The membrane permeation flux was significantly increased after the electro-flocculation/oxidation pretreatment.

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Section: Introductionmentioning

confidence: 99%

Effects of electroflocculation/oxidation pretreatment on the fouling characteristics of ultrafiltration membranes

Wang

Liao

et al. 2022

Water Science and Technology

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“…The electro-oxidation of glycerol is an interesting reaction for its potential application in fuel cells and in electrochemical synthesis. Glycerol can be converted into a variety of fine chemicals (mono-alcohols, diols, ketones and carboxylic acids) via electro-oxidation [3,4].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Supported Pd Catalysts for Potential Application in Glycerol Electro-Oxidation

2022

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Ceria-supported Pd catalysts encompassing oxides of Cu, Co, and Fe were synthesized and characterized using XRD, TEM, SEM-EDX, TPR, BET, and Raman. After the incorporation of the metal oxides, the surface area and pore volume of the ceria support decreased. XRD showed the presence of the metal oxide phases as well as the support, CeO2. TPR showed that the bimetallic catalyst had improved reducibility compared to the monometallic Pd/CeO2. TEM images showed irregular-shaped particles with an average size distribution of 2–10 nm. SEM-EDX showed that the metal oxides were evenly distributed over the surface of the support. The electro-oxidation of glycerol in an alkaline environment was evaluated using cyclic voltammetry, and the products formed were identified and quantified using GC-MS. Glyceric acid was the dominant product over Pd-CuO/CeO2, while glyceraldehyde and dihydroxyacetone were dominant over Pd-Co3O4/CeO2 and Pd-Fe2O3/CeO2, respectively.

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“…The global glycerol production was 3.6 billion liters in 2016 and is projected to reach 4.0 billion liters per year by 2026 . The abundance of glycerol has motivated the research for upgrading glycerol to value-added products, thus making biodiesel production more environmentally benign and economically feasible. − In 2004, the US Department of Energy had listed glycerol as one of the top 12 sugar-derived platform building blocks …”

Section: Introductionmentioning

confidence: 99%

Electrochemical Oxidation of Glycerol to Dihydroxyacetone in Borate Buffer: Enhancing Activity and Selectivity by Borate–Polyol Coordination Chemistry

Huang

Zou

Jiang

2021

ACS Sustainable Chem. Eng.

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Selective electrochemical oxidation of glycerol, the major byproduct during the biodiesel production process, can not only make biodiesel production more environmentally benign and economically feasible but also generate value-added C3 chemicals that are important for medicinal and cosmetics applications. However, severe C–C bond breakage often occurs, which would lead to low C3 selectivity, especially on earth-abundant, low-cost transition metal electrocatalysts. In this study, by exploiting the coordination ability of borate ions with polyol molecules, we report enhanced and selective electrochemical oxidation of glycerol to ∼85% C3 chemicals (67% for dihydroxyacetone in detected liquid products, with an average production rate of 90 mmol m–2 h–1), using cobalt borate as the electrocatalyst in borate buffer electrolyte. The improved electrochemical activity and selectivity at different borate buffer concentrations and solution pH values have been explicitly correlated with the coordination ability of borate with glycerol under different circumstances, as revealed by 11B NMR spectroscopy studies. The strategy presented herein can be potentially extended to the selective upgrading of a broad scope of biomass-derived sugars and polyols, for producing value-added chemicals on low-cost non-noble metal electrocatalysts.

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A review on advances in green treatment of glycerol waste with a focus on electro-oxidation pathway

Cited by 61 publications

References 253 publications

Effects of electroflocculation/oxidation pretreatment on the fouling characteristics of ultrafiltration membranes

Effects of electroflocculation/oxidation pretreatment on the fouling characteristics of ultrafiltration membranes

Synthesis and Characterization of Supported Pd Catalysts for Potential Application in Glycerol Electro-Oxidation

Electrochemical Oxidation of Glycerol to Dihydroxyacetone in Borate Buffer: Enhancing Activity and Selectivity by Borate–Polyol Coordination Chemistry

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