Enhancement of As(<scp>v</scp>) adsorption from aqueous solution by a magnetic chitosan/biochar composite

Liu, Shaobo; Huang, Binyan; Chai, Liyuan; Liu, Yunguo; Zeng, Guangming; Wang, Xin; Zeng, Wei; Shang, Meirong; Deng, Jiaqin; Zhou, Zan

doi:10.1039/c6ra27341f

Cited by 119 publications

(45 citation statements)

References 46 publications

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“…Taking growing environmental concerns into account, development of bio‐based and non‐toxic heterogeneous catalysts has received increasing attention. In this context, carbonization of biomass is introduced as a facile and cost‐effective method for the formation of carbonaceous products, mostly referred as bio(char), that can be potentially used for catalytic purposes, waste management, soil remediation, supercapacitors, absorbents, and fuel production . One of the promising method for the preparation of biochar is hydrothermal treatment of biomass at relatively mild temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Pd@magnetic Carbon Dot Immobilized on the Cyclodextrin Nanosponges ‐ Biochar Hybrid as an Efficient Hydrogenation Catalyst

et al. 2019

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With the aim of benefiting from the advantage of magnetic catalysts, chemistry of cyclodextrin, i. e. the capability of formation of inclusion complex and acting as phase transferring agent, as well as biochars as biocompatible, cost‐effective and efficient catalyst support, for the first time a ternary hybrid system composed of cyclodextrin nanosponges (CDNS), palladated magnetic carbon quantum dot (Pd@CQDs@Fe) and Bell‐pepper‐derived biochar (Biochar) was designed and prepared through functionalization of CDNS and Biochar and their covalent conjugation followed by immobilization of Pd@CQDs@Fe. The hybrid system was characterized and then applied as a magnetic heterogeneous catalyst for promoting hydrogenation of nitroarenes. The results confirmed high catalytic activity, selectivity and recyclability of the catalyst (up to ten reaction runs) as well as low Pd leaching. Comparing the catalytic activity of the catalyst with some control samples, the contribution of CDNS, Biochar and CQDs@Fe to the catalysis was confirmed.

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Section: Introductionmentioning

confidence: 99%

“…The resulting char, known as hydrochar, can be utilized without any modification or after physical and chemical treatment. It is worth noting that this class of bio‐based materials can be applied in combination with other materials …”

Section: Introductionmentioning

confidence: 99%

Pd@magnetic Carbon Dot Immobilized on the Cyclodextrin Nanosponges ‐ Biochar Hybrid as an Efficient Hydrogenation Catalyst

et al. 2019

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“…Hydrothermally‐derived biochars are known as hydrochars and attracted immense attention due to their simple preparation method. These compounds can be considered as promising candidates for various applications ranging from fuels production and waste management to soil remediation, absorbent and catalysis . It is important to note that chars in their individual or in combination with other materials can be applied …”

Section: Introductionmentioning

confidence: 99%

Salep as a biological source for the synthesis of biochar with utility for the catalysis

Sadjadi

Heravi

Kahangi

2019

Applied Organom Chemis

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Hydrothermal carbonization of salep as a domestic biosource was carried out to afford a biochar, BC, with exceptional catalytic activity. BC can be further magnetized by incorporation of magnetic nanoparticles to furnish a magnetic catalyst, BC‐Fe, with improved recovery and recyclability for the hydrogenation of nitroarenes in the absence of any precious metal. BC‐Fe was also applied as a catalyst support for the immobilization of Pd nanoparticles and development of an efficient, biocompatible and cost‐effective catalyst, Pd@BC‐Fe, with utility for the oxidation of benzyl alcohols under mild reaction condition in a selective manner to afford corresponding acids in high yields. The study of the recyclability of the catalyst confirmed high recyclability of Pd@BC‐Fe.

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“…Therefore, biochar modifications like physical activation and chemical treatment have been applied to improve its sorption ability (Li et al, 2017;Rajapaksha et al, 2016;Sizmur et al, 2017). Even though there are many studies on the adsorption capacity of raw and modified biochars (Liu et al, 2017;Zuo et al, 2017), an evaluation of the modification of the biochar properties is yet to be done. Indeed, the biochar surface properties are important parameters that influence the behavior of a sorbent to sorb anionic and cationic pollutants.…”

Section: Introductionmentioning

confidence: 99%

Changes of sewage sludge digestate-derived biochar properties after chemical treatments and influence on As(III and V) and Cd(II) sorption

Wongrod

Simon

Hullebusch

et al. 2018

International Biodeterioration & Biodegradation

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This work seeks to extend the knowledge on the effect of chemical treatments of sewage sludge digestate (SSD)-derived biochar for As(III and V) and Cd(II) sorption ability using potassium hydroxide (KOH) or hydrogen peroxide (H 2 O 2). Results showed the increases of pH of point of zero charge, the Brunauer-Emmett-Teller (BET) surface area and cation exchange capacity (CEC) after chemical treatments of biochar. The sorption ability was enhanced from 1.6 µmol g-1 (As(V)) and 16.1 µmol g-1 (Cd(II)) on raw biochar to 8.5 µmol g-1 (As(V)) and 318.5 µmol g-1 (Cd(II)) on KOH-modified biochar. Furthermore, arsenic redox distribution showed a large oxidation (70%) of As(III) to As(V) in KOH-biochar with batch washing, while a partial oxidation (7%) was observed in KOH-biochar with batch and subsequently column washing. The washing procedures after KOH treatment play an important role on arsenic sorption, due to the release of phosphate (PO 4 3-) as well as organic matter from the biochar that may subsequently lead to the oxidation of As(III) to As(V). Our findings highlight the potential influence of biochar on the redox transformation of As(III) to As(V) and therefore require a careful assessment while investigating the fate of As in aquatic environments.

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Enhancement of As(v) adsorption from aqueous solution by a magnetic chitosan/biochar composite

Abstract: In this study, a magnetic chitosan/biochar composite (MCB) was prepared successfully, and characterized by SEM, TEM, VSM, XRD, FTIR, XPS, and zeta-potential to obtain its physical and chemical properties.

Cited by 119 publications

References 46 publications

Pd@magnetic Carbon Dot Immobilized on the Cyclodextrin Nanosponges ‐ Biochar Hybrid as an Efficient Hydrogenation Catalyst

Pd@magnetic Carbon Dot Immobilized on the Cyclodextrin Nanosponges ‐ Biochar Hybrid as an Efficient Hydrogenation Catalyst

Salep as a biological source for the synthesis of biochar with utility for the catalysis

Changes of sewage sludge digestate-derived biochar properties after chemical treatments and influence on As(III and V) and Cd(II) sorption

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