Adsorption of hexavalent chromium onto Bamboo Charcoal grafted by Cu2+-N-aminopropylsilane complexes: Optimization, kinetic, and isotherm studies

Wu, Yunhai; Zhu, Ming; Yang, Shengxin; Fan, Yiting; Peng, Fang; Sha, Hao; Cha, Ligen

doi:10.1016/j.jiec.2016.10.034

Cited by 31 publications

(11 citation statements)

References 41 publications

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“…The adsorption capacity of Cr(VI) on bamboo charcoal grafted by Cu 2+ -N-aminopropylsilane complexes also reduces with increase of ion strength(Wu et al, 2017). For the biochars prepared at different temperatures, their selective adsorption ability of Cr(VI) follows the order of C300>C500>C700.…”

mentioning

confidence: 98%

Environmentally persistent free radicals mediated removal of Cr(VI) from highly saline water by corn straw biochars

Zhao

Yin

Liu

et al. 2018

Bioresource Technology

147

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Heavy metal ions coexisting with salts in the contaminant water are difficult to remove due to the interference of salts. Herein, biochars were pyrolyzed by corn straw at different temperatures, aiming to remove Cr(VI) in the presence of salts. Results show that biochars had surprisingly selective adsorption of Cr(VI). X-ray photoelectron and X-ray absorption near edge spectra revealed that Cr(VI) was reduced to Cr(III). All the adsorption was conducted at pH ∼ 7, which differed from the previous studies that Cr(VI) could only be reduced at pH 2-4. Environmental persistent free radicals (EPFRs) on biochars were found to play the role in reducing Cr(VI) in neutral solutions, which was confirmed by electron spin resonance and free radical quenching. The biochar with EPFRs reveals a highly selective removal of Cr(VI), which has implications for the remediation of contaminated water. This work provides a new insight into biochar's properties and potential environmental applications.

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mentioning

confidence: 98%

Environmentally persistent free radicals mediated removal of Cr(VI) from highly saline water by corn straw biochars

Zhao

Yin

Liu

et al. 2018

Bioresource Technology

147

View full text Add to dashboard Cite

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“…With an increase of pH at values higher than 2.5 the adsorption capacities of the studied material decrease. At lower pH the predominant species of chromium ions is HCrO 4 − and the adsorbent surface present an increase in H + ions [27,28]. The strong electrostatic attraction between positively charged adsorbent surface and chromate ions can be the explanation of the increasing of the adsorption capacity of the studied materials at lower pH values.…”

Section: Effect Of Ph On the Adsorption Capacitymentioning

confidence: 84%

“…The main sources chromium release are from industrial production processes such as electroplating, leather tanning, textile industries metal finishing, nuclear power plant, and chromate preparation [3,4]. Solid wastes from chromate-processing facilities, can be sources of pollution for groundwater, where the chromium deposit time might be several years.…”

Section: Introductionmentioning

confidence: 99%

Heavy metal removal from waste waters by phosphonate metal organic frameworks

Maranescu

Lupa

Visa

2017

Pure and Applied Chemistry

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Abstract:The increase attention in the area of phosphonate metal organic framework is exemplified with a variety of applications and a rich chemistry of these compounds. Water pollution caused by heavy metal ions is a major concern due to their toxicity to many life forms. In order to decrease the heavy metals impact upon the environment various technologies of water treatment such as: chemical sedimentation, ion exchange, redox process are studied. The tendency is to find a versatile and economical method of heavy metals removal from waste waters. Phosphonate metal organic frameworks were obtained by the reaction of Ni(CH 3 COO) 2 · 4H 2 O, phosphonic acid (phosphonoacetic (CP), vinyl phosphonic acid (VP) and N,N-bis(phosphonomethyl)glycine (Gly)) in hydrothermal conditions. Coordination polymers synthesized were characterized by FTIR, XRD, scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The adsorption processes represent a very good alternative for heavy metals removal due to low costs and ease of operation. In the present paper the adsorption performance of the mentioned materials in the removal process of heavy metals from aqueous solutions, was studied using the batch method. The adsorption conditions were investigated by varying the initial pH, contact time and adsorbate initial concentration for chromium metal ions removal from aqueous solutions. It was found that the adsorption efficiency of the studied materials in the removal process of Cr(VI) ions from aqueous solutions is in the following order: Ni-CP < Ni-Gly ≤ Ni-VP.

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“…Apesar do seu forte caráter siderúrgico, o carvão é comumente utilizado para a cocção de alimentos, produção de cimento, incorporação a substratos para produção de mudas entre outros. Adicionalmente, a ativação do carvão vegetal amplia as suas aplicações, a exemplo do que ocorre nas indústrias de açúcar para purificação e branqueamento; fabricação de óleos e gorduras; produção de bebidas alcoólicas, para a retirada de odores desagradáveis e adsorção de partículas em suspensão; purificação e armazenamento de produtos farmacêuticos; tratamento e descontaminação de água, eliminando odores, gostos desagradáveis e elementos tóxicos; purificação do ar, desodorização de ambientes e remoção de elementos metais pesados do solo (BANSAL; GOYAL, 2005;YU et al, 2006;MIMURA et al, 2010;KARUNAKARA et al, 2015;ILOMUANYA et al, 2017;WU et al, 2017).…”

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“…Os métodos químicos, normalmente, utilizam como agentes de ativação o cloreto de zinco e sulfeto de potássio, sais desidratantes, ácido fosfórico, dolomita, hidróxido de sódio e ácido sulfúrico (ILOMUANYA et al, 2017;WU et al, 2017). Todavia, o método por vapor d'água é o mais barato e não limita as utilizações futuras do carvão vegetal ativado.…”

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Produção E Ativação Do Carvão Vegetal De Três Espécies Florestais

Arruda

Andrade

Júnior³

2017

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ResumoEste estudo teve por objetivo analisar as variáveis da produção do carvão vegetal das madeiras de Acacia mangium, Pseudosamanea guachapelle e Eucalyptus grandis e analisar a capacidade de adsorção de pigmentos pelos carvões produzidos e ativados com vapor d'água superaquecido. Para isso, as amostras das madeiras foram carbonizadas sob as temperaturas de 400, 500 e 600 °C numa velocidade de aquecimento de 1,67 °C min -1 e tempo total de carbonização de 4, 5 e 6 horas, respectivamente. Após a carbonização, determinaram-se os rendimentos gravimétricos em carvão, líquido pirolenhoso, gases não condensáveis e realizou-se a análise imediata dos carvões. Os carvões foram ativados sob a ação de vapor d'água superaquecido e testados em relação à adsorção de pigmentos coloridos dissolvidos em água. Para as três espécies analisadas, as menores temperaturas de carbonização proporcionaram os maiores rendimentos em carvão vegetal. As maiores temperaturas de carbonização resultaram nos menores teores de materiais voláteis e maiores teores de carbono fixo nos carvões. A ativação com vapor d'água superaquecido influenciou positivamente a adsorção de pigmentos do carvão de P. guachapelle produzido a 400 °C e dos carvões de A. mangium e E. grandis produzidos a 500 °C. A madeira de P. guachapelle carbonizada à 400 °C se destacou em relação às duas outras espécies florestais analisadas. Palavras-chave: Vapor d'água superaquecido; adsorção de pigmentos em suspensão; carvão ativado. Abstract Production and activation of charcoal of three forest species. The objective of this study was to analyze the charcoal production variables of Acacia mangium, Pseudosamanea guachapelle and Eucalyptus grandiswood and to analyze the adsorption of pigments by the activated carbon with activated water vapor. The wood samples were carbonized at temperatures of 400, 500 and 600 °C, heating rate of 1.67 °C min -1 and total carbonization time of 4, 5 and 6 hours, respectively. After the carbonization process, the gravimetric yields were determined in charcoal, pyroligneous liquid, non-condensable gases and the immediate analysis of the charcoal was carried out. The charcoal were activated with heated water vapor and tested for adsorption capacities of colored pigments dissolved in water. For the three species analyzed, the lower carbonization temperatures resulted in higher yields of charcoal. The higher carbonization temperatures resulted in lower contents of volatile materials and higher fixed carbon contents in the charcoal. Activation with heated water vapor positively influenced the adsorption of pigments from the P. guachapelle charcoal produced at 400 °C and the A. mangium and E. grandis charcoal produced at 500 °C. The wood of P. guachapelle charred at 400 °C stood out in relation to the two other forest species analyzed.

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Adsorption of hexavalent chromium onto Bamboo Charcoal grafted by Cu2+-N-aminopropylsilane complexes: Optimization, kinetic, and isotherm studies

Cited by 31 publications

References 41 publications

Environmentally persistent free radicals mediated removal of Cr(VI) from highly saline water by corn straw biochars

Environmentally persistent free radicals mediated removal of Cr(VI) from highly saline water by corn straw biochars

Heavy metal removal from waste waters by phosphonate metal organic frameworks

Produção E Ativação Do Carvão Vegetal De Três Espécies Florestais

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