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Preparation and application of modified corn straw as a biosorbent for Cr(VI) adsorption / Zeng Chunhui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 4 (07-08/2019)
[article]
Titre : Preparation and application of modified corn straw as a biosorbent for Cr(VI) adsorption Type de document : texte imprimé Auteurs : Zeng Chunhui, Auteur ; Zhang Ye, Auteur ; Xu Zhang, Auteur ; Qi Lu, Auteur Année de publication : 2019 Article en page(s) : p. 213-218 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption
Biosorbant
Caractérisation
Chimie analytique
Chrome hexavalent
Eaux usées -- Epuration
Maïs et constituants
PailleIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Modified corn straw, MCS, was prepared by pretreatment and esterification modification technology. The optimisation and mechanism of Cr(VI) adsorption performance was critically investigated via orthogonal experimental design and single-factor comparison experiments. Experimental results indicated that the MCS dosage and pH value had the greatest effect on the Cr(VI) adsorption process. Moreover, the Cr(VI) adsorption rate (CrAR) and maximum adsorption capacity (CrAC) were 96.8 % and 121mg/g respectively under the optimal condition (MCS dosage : 0.04g, adsorption time: 45 minutes, pH3, adsorption temperature: 40°C, Cr(VI) initial concentration : 10mg/L), which was an increase of 10.3 times compared to unmodified corn straw. FTIR analysis testified that carboxyl and ester groups were introduced into the MCS. Meanwhile, it turned out that the cellulose structure ctf MCS was found to be more orderly by SEM analysis than that of CS. The MCS might show great potentiel for application in the adsorption of Cr(VI) in tannery wastewater as a new type of biosorbent. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of modified corn stalk (MCS) - Adsorption tests of Cr(VI) by MCS - Characterisation
- RESULTS AND DISCUSSION : Orthogonal experiment results - Influence of MCS dosage on Cr(VI) adsorption - Influence of pH on Cr(VI) adsorption - Influence of temperature on Cr(VI) adsorption - SEM analysis - FTIR analysisEn ligne : https://drive.google.com/file/d/1_QV07J2Xpn1E49OcWjF4xdTICk767T2s/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32802
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 4 (07-08/2019) . - p. 213-218[article]Réservation
Réserver ce documentPreparation of maleic acid modified peanut shell adsorbent and its adsorption performance for Cr(VI) / Zeng Chunhui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 6 (11-12/2022)
[article]
Titre : Preparation of maleic acid modified peanut shell adsorbent and its adsorption performance for Cr(VI) Type de document : texte imprimé Auteurs : Zeng Chunhui, Auteur ; Zhang Ye, Auteur ; Feng Hanjun, Auteur ; Qi Lu, Auteur Année de publication : 2022 Article en page(s) : p. 246-251 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants
Caractérisation
Chrome hexavalent
Coque d'arachideIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Peanut shell adsorbents prepared by microwave pretreatment and maleic acid modification technology, were used to study the adsorption properties for Cr(VI). Meanwhile, structural characterisation, optimisation of adsorption conditions, isotherm adsorption and adsorption kinetics were critically investigated through experiments and detection techniques. XRD analysis showed that the crystallinity of peanut shells decreased significantly after microwave pretreatment. FTIR analysis testified that carboxyl groups and ester groups were successfully introduced into the structure of maleic acid modified peanut shells (MMPS). The results of orthogonal test and single factor experiments indicated that pH value had the greatest effect on Cr(VI) adsorption process. Moreover, the Cr(VI) adsorption rate (CrAR) reached the maximum value of 99.3 % under the optimal condition (MMPS dosage: 6g, adsorption time: 45 minutes, pH3, adsorption temperature: 80°C, Cr(VI) initial concentration: 30mg/L), which was much higher than that of unmodified peanut shells. The adsorption behaviour conformed to quasi-second-order kinetic equation and Langmuir isothermal adsorption model, and the adsorption was dominated by monolayer. Note de contenu : - EXPERIMENTAL PROCEDURES : Raw materials and instruments - Pretreatement of peanut shells - Preparation of maleic acid modified peanut shell (MMPS) adsorbent - Adsorption tests of Cr(VI) by MMPS - Adsorption kinetics test - Isothermal adsorption test - Characterisation
- RESULTS AND DISCUSSION : XRD analysis - FTIR analysis - Orthogonal experiment results - Influence of pH on Cr(VI) adsorption - Adsorption kinetic model and analysis - Isothermal adsorption model and analysis
- Table 1 : Results and analysis processing of orthogonal experiments
- Table 2 : Kinetic parameters for the adsorption of MMPS on CR(VI)
- Table 3 : Adsorption isothermal parameters of Langmuir and Freundlich modelsEn ligne : https://drive.google.com/file/d/1SjwOX76ma1rIRt9NGce2YIYwaFI6iJGB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38516
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 6 (11-12/2022) . - p. 246-251[article]Réservation
Réserver ce document