Biochars produced from various agro-industrial by-products applied in Cr(VI) adsorption-reduction processes

Penido, Evanise Silva; Oliveira, Maísa Azarias de; Sales, Alice Liberato Ribeiro; Ferrazani, Júlia Costa; Magalhães, Fabiano; Bianchi, Maria Lúcia; Melo, Leônidas Carrijo Azevedo

doi:10.1080/10934529.2021.2000814

Cited by 6 publications

(2 citation statements)

References 46 publications

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“…Therefore, adsorption is one of the most prominent approaches to water and wastewater decontamination. Due to this fact, many adsorbents with different structural conformations and compositions have been prepared or modified, for instance, clays/zeolites [ 18 ], biosorbents [ 19 ], agricultural solid wastes [ 20 ], and industrial by-products [ 21 ]. In practical operations, activated carbon is one of the most used adsorbents, thanks to its excellent adsorption performance [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Cationic Pollutant Removal from Aqueous Solution Using Reduced Graphene Oxide

et al. 2022

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Reduced graphene oxide (rGO) is one of the most well-known graphene derivatives, which, due to its outstanding physical and chemical properties as well as its oxygen content, has been used for wastewater treatment technologies. Particularly, extra functionalized rGO is widely preferred for treating wastewater containing dyes or heavy metals. Nevertheless, the use of non-extra functionalized (pristine) rGO for the removal of cationic pollutants is not explored in detail or is ambiguous. Herein, pristine rGO—prepared by an eco-friendly protocol—is used for the removal of cationic pollutants from water, i.e., methylene blue (MB) and mercury-(II) (Hg-(II)). This work includes the eco-friendly synthesis process and related spectroscopical and morphological characterization. Most importantly, the investigated rGO shows an adsorption capacity of 121.95 mg g−1 for MB and 109.49 mg g−1 for Hg (II) at 298 K. A record adsorption time of 30 min was found for MB and 20 min for Hg (II) with an efficiency of about 89% and 73%, respectively. The capture of tested cationic pollutants on rGO exhibits a mixed physisorption–chemisorption process. The present work, therefore, presents new findings for cationic pollutant adsorbent materials based on oxidized graphenes, providing a new perspective for removing MB molecules and Hg(II) ions.

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Section: Introductionmentioning

confidence: 99%

Cationic Pollutant Removal from Aqueous Solution Using Reduced Graphene Oxide

et al. 2022

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“…Currently, the methods that are commonly used to remove Cr from wastewater primarily include ion exchange, chemical precipitation, electrochemistry, membrane filtration, and adsorption, among others [ 4 , 5 , 6 , 7 , 8 ]. Among these methods, adsorption is considered a suitable method to remove Cr in wastewater owing to its advantages of convenient operation and environmental protection [ 7 , 9 , 10 , 11 , 12 , 13 , 14 ]. However, the high cost of adsorbents limits their application in heavy metal wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

The Removal of Cr(VI) from Aqueous Solutions with Corn Stalk Biochar

Yang

Gao

Quan

et al. 2022

IJERPH

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The discharge of wastewater containing hexavalent chromium (Cr(VI)) into the environment is very harmful to living things. Therefore, before effluent that contains Cr(VI) can be discharged into the environment, this toxin should be removed from the contaminated water. In this study, corn stalk biochar was investigated to evaluate the Cr(VI) removal efficiency from an aqueous solution. The effects of pH (2–10), biochar concentration (0.5 to 10 g/L), Cr(VI) concentration (10–500 mg/L), and contact time (10–1440 min) were studied. The actual experimental value of the Cr(VI) removal efficiency was 28.67%, largely consistent with the predicted model value of 29.31%, under the optimal conditions of a Cr(VI) concentration of 60 g/L, pH 4, contact time of 270 min, and a biochar concentration of 4.5 g/L. A significant interaction between the Cr(VI) concentration and pH was observed, along with significance in the interaction between Cr(VI) concentration and biochar concentration, which had a greater impact on the removal of Cr(VI). Biosorption onto corn stalk biochar is an affordable and economical adsorption process to treat wastewater contaminated with Cr(VI). The aim of this study is to provide data to serve as a basis for future studies on the use of raw agricultural waste to remove Cr(VI).

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A comparative study on the removal of Cr(VI) from simulated wastewater using magnetic biochar derived from Wodyetiabifurcata and biochar modified with H₂SO₄

Indrani,

Saranya

2024

AIP Conference Proceedings

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Biochars produced from various agro-industrial by-products applied in Cr(VI) adsorption-reduction processes

Cited by 6 publications

References 46 publications

Cationic Pollutant Removal from Aqueous Solution Using Reduced Graphene Oxide

Cationic Pollutant Removal from Aqueous Solution Using Reduced Graphene Oxide

The Removal of Cr(VI) from Aqueous Solutions with Corn Stalk Biochar

A comparative study on the removal of Cr(VI) from simulated wastewater using magnetic biochar derived from Wodyetiabifurcata and biochar modified with H₂SO₄

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