Removal of hexavalent Cr by coconut coir and derived chars – The effect of surface functionality

Shen, Ying-Shuian; Wang, Shan‐Li; Tzou, Yu-Min; Yan, Ya-Yi; Kuan, Wen-Hui

doi:10.1016/j.biortech.2011.10.096

Cited by 163 publications

(60 citation statements)

References 33 publications

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“…This phenomenon consisted well with the XRD results (Fig.S3). Although the CR carbonization had a significantly negative influence on the reduction capacity of the CR-chars (Shen et al, 2012), the SSA (236.48 m² g -1 ) of AC600 was larger than that of BC600 (0.58 m² g -1 ) and CR (0.06 m² g -1 ). The AC600 had well-developed mesoporous structure and had a better adsorption performance than NH 2 To further investigate the mechanism of Cr(VI) removal, XRD technology was applied to analyzed the crystallinity of CR and derived chars before and after Cr(VI) removals (Fig.S3).…”

Section: Cr(vi) Removal Mechanismsmentioning

confidence: 79%

Removal behaviors and mechanisms of hexavalent chromium from aqueous solution by cephalosporin residue and derived chars

Zhang

Chen

Zhang

et al. 2017

Bioresource Technology

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Section: Cr(vi) Removal Mechanismsmentioning

confidence: 79%

Removal behaviors and mechanisms of hexavalent chromium from aqueous solution by cephalosporin residue and derived chars

Zhang

Chen

Zhang

et al. 2017

Bioresource Technology

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“…Biochar, a carbonaceous solid product of pyrolysis or incomplete combustion of organic materials, has been receiving increasing attention in various environmental applications due to its strong affinity for contaminants (Ghosh et al, 2011;Uchimiya et al, 2011;Shen et al, 2012) and ability for carbon sequestration (Lehmann, 2007). Previous researches have demonstrated that biochars with different functional group compositions show contrasting affinity for inorganic (heavy metals, for instance) (Shen et al, 2012) and organic contaminants (Zhu et al, 2005;Chen et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Previous researches have demonstrated that biochars with different functional group compositions show contrasting affinity for inorganic (heavy metals, for instance) (Shen et al, 2012) and organic contaminants (Zhu et al, 2005;Chen et al, 2012). Selection of proper biochars produced at optimized conditions, which are suitable for sequestration/immobilization of specific contaminants, should be critical to improve their efficiency as soil amendments (Al-Wabel et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Properties of biomass-derived biochars: Combined effects of operating conditions and biomass types

Luo

Chen

et al. 2015

Bioresource Technology

180

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h i g h l i g h t sCombined effects of operating conditions on biochar properties were investigated. Temperature and atmosphere act as key factors determining biochar properties. DOC molecular weight varies with biomass type and increases with temperature. Phase transition of biomass structures occurs at around 400°C. Environmental risks from biochar-derived DOC deserve much attention. a r t i c l e i n f o 8 h) and rate, and atmosphere (air-flow, air-limited and N 2 ) on the physicochemical properties of biochars with pine sawdust, maize straw and sugarcane bagasse as feedstocks were investigated. The results demonstrated that production temperature and atmosphere acted as the predominant factors that determined the properties of biochars. The X-ray diffraction data confirmed the occurrence of phase transition in the biomass structures at around 400°C. Heating time and rate showed little effect on the functional group compositions of the biochars within 8 h, particularly under N 2 atmosphere. In addition, the molecular weights of the biochar-derived dissolved organic carbon tended to increase with increasing temperature. Feedstock type also affected the biochar properties by the compositional differences in mineral salts and cellulose/lignin in the three biomass materials. This work provides important information for optimizing procedures for biochar production with desired properties and high yield.

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“…Charred biomasses, on the other hand, are estimated to have mean residence times of thousands of years in soils (Lehmann et al 2008). Many studies have investigated the adsorption of Pb, Cr, and Cu on biochar in single sorbate systems (Liu and Zhang 2009;Mohan et al 2011;Tong et al 2011;Lu et al 2012;Shen et al 2012;Li et al 2013). However, as metals usually coexist in the environment and undergo competitive sorption (Zhu et al 2010;Chen et al 2011), the study of systems with a mixture of contaminants is paramount.…”

Section: Introductionmentioning

confidence: 99%

Effect of pruning-derived biochar on heavy metals removal and water dynamics

et al. 2014

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Biomass-derived biochar is considered as a promising heavy metal adsorbent, due to abundance of polar functional groups, such as carboxylic, hydroxyl, and amino groups, which are available for heavy metal removal. The aims of this study were to evaluate the effectiveness of an orchard pruning-derived biochar in removing some heavy metals (through the evaluation of isotherms) and to study water dynamics at the solid-liquid interface as affected by heavy metal adsorption (through an innovative nuclear magnetic resonance (NMR) relaxometry approach). Both isotherms and NMR spectra revealed that Pb and Cr showed a good affinity for the biochar surface (Pb > Cr), while Cu was less affine. Accordingly, higher amounts of Pb and Cr were adsorbed by biochar as compared to those of Cu in the single systems. In binary systems (i.e., when two metals were applied simultaneously), Pb showed the highest inhibition of the adsorption of the other two metals, whereas the opposite was evidenced when Cu was used; the competitive adsorption was also strongly influenced by the metal residence time on biochar surface. In ternary systems (i.e., when all metals were applied simultaneously), even in the presence of high amounts of Pb and Cr, considerable adsorption of Cu occurred, indicating that some biochar adsorption sites were highly specific for a single metal.

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Removal of hexavalent Cr by coconut coir and derived chars – The effect of surface functionality

Cited by 163 publications

References 33 publications

Removal behaviors and mechanisms of hexavalent chromium from aqueous solution by cephalosporin residue and derived chars

Removal behaviors and mechanisms of hexavalent chromium from aqueous solution by cephalosporin residue and derived chars

Properties of biomass-derived biochars: Combined effects of operating conditions and biomass types

Effect of pruning-derived biochar on heavy metals removal and water dynamics

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