Preparation of Novel Fe Catalysts from Industrial By-Products: Catalytic Wet Peroxide Oxidation of Bisphenol A

Pesonen

et al. 2021

Catalysts

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In this study, novel and cost-effective alkali-activated materials (AAMs) for catalytic applications were developed by using an industrial side stream, i.e., blast furnace slag (BFS). AAMs can be prepared from aluminosilicate precursors under mild conditions (room temperature using non-hazardous chemicals). AAMs were synthesized by mixing BFS and a 50 wt % sodium hydroxide (NaOH) solution at different BFS/NaOH ratios. The pastes were poured into molds, followed by consolidation at 20 or 60 °C. As the active metal, Fe was impregnated into the prepared AAMs by ion exchange. The prepared materials were examined as catalysts for the catalytic wet peroxide oxidation (CWPO) of a bisphenol A (BPA) aqueous solution. As-prepared AAMs exhibited a moderate surface area and mesoporous structure, and they exhibited moderate activity for the CWPO of BPA, while the iron ion-exchanged, BFS-based catalyst (Fe/BFS30-60) exhibited the maximum removal of BPA (50%) during 3 h of oxidation at pH 3.5 at 70 °C. Therefore, these new, inexpensive, AAM-based catalysts could be interesting alternatives for catalytic wastewater treatment applications.

Section: Introductionmentioning

confidence: 99%

Alkali-Activated Materials as Catalysts for Water Purification

Pesonen

et al. 2021

Catalysts

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“…Commercial GAC has been acknowledged as an excellent material for removing low-solubility contaminants (such as phenolic compounds from wastewater) [4,5,7], but a major disadvantage is the high price. In contrast, the utilization of waste biomass residues, such as seeds [8,9], wood [10,11], and fruit stones [12,13], in activated carbon has become very popular for several reasons: the unwanted waste can be used as value-added materials (e.g., catalysts), waste is typically inexpensive and comes from renewable sources. To enhance these materials to have similar or even better characteristics than their commercial counterparts is preferred [14].…”

Section: Introductionmentioning

confidence: 99%

Biomass-based composite catalysts for catalytic wet peroxide oxidation of bisphenol A: Preparation and characterization studies

Juhola

Journal of Environmental Chemical Engineering

Tuomikoski

et al. 2019

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The wet granulation process was used to prepare new, efficient, and cost-effective granular biomass-based composite catalysts for catalytic wet peroxide oxidation (CWPO) of bisphenol A (BPA). The most stable composite granules was prepared by mixing biomass-based carbon residue (CR) with metakaolin (MK) combined with calcium oxide (CaO) or cement and a solvent (NaOH or KOH). For all the prepared composite granules, the optimized binding agents to carbon ratio was 0.3, the solvent to carbon ratio 1.2, and the agitation rate 1200 rpm. The specific surface area of the prepared catalysts was 152-205 m 2 /g. The composite granular catalyst (CR+MK+CaO+NaOH) had the most durable and stable structure (compressive strength of 27 N) and the most basic surface (15 mmol/g) measured with temperature programmed desorption. This catalyst was the most active in CWPO of BPA and total organic carbon removal of 50% and 48%, respectively.

“…Utilization of EC sludge as adsorbent refills all the qualities that are needed for adsorbent. There is a need for further examination of EC sludge use in adsorption and modification of sludge to use it as more selectivity adsorbent Juhola et al (2017). result in their study the highest BPA removal efficiency of 83 %.…”

mentioning

confidence: 99%

Use of Fe and Al Containing Electrocoagulation Sludge as an Adsorbent and a Catalyst in Water Treatment

Rajaniemi

et al. 2023

J. Environ. Eng.

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In this study, three different electrocoagulation (EC) sludges were studied as an adsorbent (removal of humic acids) and as a catalyst (catalytic wet peroxide oxidation, CWPO, of bisphenol A (BPA).The sludges originated from electrocoagulation process in which aluminum (Al) and iron (Fe) electrodes were used for the treatment of mining industry wastewater. All the materials were used as dried sludge and as calcined material. The stability of these materials was studied in neutral and alkaline conditions with analysis of the leached iron content in solution.Based on the EC sludge characterization with X-ray fluorescence (XRF), X-ray diffractometer (XRD) and diffuse-reflectance infrared Fourier transform spectroscopy (DRIFT) different forms of Fe occurring in EC sludges were found. The Brunauer-Emmett-Teller (BET) method showed reduced surface area after calcination process. Stability of the sludges was studied in neutral conditions, and the amount of iron leaching was low (<1.4 ppm). Adsorption experiments showed that the removal of humic acids (measured as TOC) was over 50 % in all tested materials in the pH range of 3 -9, and over 92 % with the S3 calcined material in all studied pH range. The calcined samples were catalytically more active than raw material in CWPO of BPA. The highest removal of BPA was 85 % over calcined sludge. Therefore, calcined EC sludges are suitable materials for catalyst and adsorbent use. ManuscriptClick here to access/download;Manuscript;Revised3_17.10.2022_withoutMain novelty of this paper was the finding of sludge modification in the EC process of water treatment through different electrode material and current density. This modification can be made in EC water treatment process, and it may provide low-cost materials to different utilization of EC sludge.