H2O2-induced surface modification: A facile, effective and environmentally friendly pretreatment of chitosan for dyes removal

Shen, Chensi; Wen, Yuezhong; Kang, Xiaodong; Liu, Weiping

doi:10.1016/j.cej.2010.10.075

Cited by 60 publications

(17 citation statements)

References 33 publications

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“…The grapefruit peelings were pretreated using H 2 O 2 according to Shen et al (2011). Briefly, 1.5 g of biosorbent and 150 mL of H 2 O 2 (1 M) were added to an 250 mL Erlenmeyer flask and stirred at 110 rpm for 24 h. These wastes were dried and grinded following the procedure described in the previous section.…”

Section: Pretreatment Of Biosorbentsmentioning

confidence: 99%

“…Moreover, to improve the adsorption of organic and inorganic compounds, several pretreatments of the biosorbents have been proposed. Among the different pretreatments, several compounds such as NaOH, CaCl 2 , organic acids (citric acid, oxalic acid), inorganic acids (HCl, H 2 SO 4 and HNO 3 ) or H 2 O 2 (Daffalla et al, 2012;Cobas et al, 2014;Shen et al, 2011) have been used. However, these biosorbents have been developed for the treatment of a specific target compound (organic or inorganic).…”

Section: Introductionmentioning

confidence: 99%

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Grapefruit peelings as a promising biosorbent for the removal of leather dyes and hexavalent chromium

Rosales

Meijide

Tavares

et al. 2016

Process Safety and Environmental Protection

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The objective of this study was to find a suitable and versatile agroforestry waste as alternative low-cost biosorbents for the removal of inorganic and organic compounds present in the wastewater of tannery industry [leather dyes and Cr(VI)]. Grapefruit peelings, fern, eucalyptus barks, oak leaves and cane pruning of grapevines were evaluated as biosorbents. Among them, grapefruit peelings showed the best results reaching 45 and 55% for the mixture of dyes and Cr(VI), respectively. A significant improvement in the performance of this biosorbent was obtained when it was pretreated with H 2 O 2 (1 M) attaining the highest removal capacity of 80% and 100%, respectively. This biosorbent was characterised showing an adsorption capacity of 1.1003 meq/g and pH ZPC 3.48. The adsorption working parameters, kinetics and isotherms were deeply studied in order to scale up the process to a continuous treatment system. Adsorption isotherms data fitted well to the Langmuir model with a maximum uptake of 37.427 mg/g for dyes mixture and 39.0628 mg/g for Cr(VI). Finally, the dynamic behaviour of the system, operating at different flow rates, was evaluated using a Homogeneous Surface Diffusion Model. Pretreated grapefruit peelings demonstrated to be a suitable low-cost biosorbent in the treatment of wastewater of tannery industry.

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Section: Pretreatment Of Biosorbentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grapefruit peelings as a promising biosorbent for the removal of leather dyes and hexavalent chromium

Rosales

Meijide

Tavares

et al. 2016

Process Safety and Environmental Protection

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“…Compared with the Freundlich isotherm model, the Langmuir isotherm model assumes that the active sites on the carbonized sludge surface are homogeneously distributed, and the removal of the adsorbate takes place on a specific homogenous surface by monolayer adsorption. Moreover, as the dye molecules adsorb onto a surface site, other molecules cannot bind at that site (21).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Rapid Removal of Dyes by Carbonized Sludge: Process, Effects of Environmental Factors, and Mechanism

Shen

et al. 2014

Separation Science and Technology

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The disposal of sewage sludge is one of the most pressing environmental issues with increasing amount of sewage sludge. Among these methods, carbonized sludge is thought to be a potential approach for resource utilization and becomes one of the most widely used adsorbent for wastewater treatment. However, effects of environmental factors and its relative mechanism for pollutant removal have not been thoroughly studied. In this study, carbonized sludge derived from sewage sludge was investigated. The adsorption of C. I. Acid Red 73 (AR 73) on the carbonized sludge was a rapid process and fit well to the Langmuir model with a maximum adsorption capacity of 137.95 mg g −1 at pH 6.8. In addition, the common coexisting ions had a negligible negative impact on dye adsorption on the carbonized sludge. The magnetic carbonized sludge also exhibited high adsorption efficiency for other anionic dyes. Furthermore, the adsorption mechanism was proposed by analysis Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), high surface area, and proper porous structure as well as the π -π interaction between dye molecules and the graphene carbon surface were likely be the mechanisms of dye adsorption. Overall, the results reported herein indicated that carbonized sludge is very attractive and implies a potential of practical application for dyeing effluent treatment.

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“…Overall, the primary difference between a-chitosan and bchitosan is that the a-structure is stabilised with intra-chain, intra-sheet and inter-sheet hydrogen bonds between the antiparallel sheets, while the polymer chains of the b-structure are in a parallel arrangement with relatively weak intermolecular forces and loose packing. For chitosan, although hydrogen bonds between different chitosan chains block the availability of amine groups, broken hydrogen bonds in the exposed faces of the crystal parts result in an increase of free amine groups on the surface of the chitosan powder (Shen et al 2011b). Compared with b-chitosan, it is easier for pristine a-chitosan with an ordered structure to be protonated in a weakly acidic solution.…”

Section: Proposed Working Mechanismmentioning

confidence: 99%

Tuning the adsorption behaviour of β-structure chitosan by metal binding

Wang

et al. 2018

Environ. Chem.

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Environmental contextChitosan is an abundant natural component of marine life with potential applications as an adsorbant material for pollutants. We investigate the binding behaviour of chitosan, and show that the β-type structure readily chelates metal ions leading to enhanced adsorption of anionic pollutants in the chitosan-metal complex. The results are highly relevant to the removal of anionic organic pollutants from water. AbstractChitosan, which is commonly extracted from squid pens of the Loligo genus, has a β-type structure. Chitosan has potential application to the adsorption of pollutants but has received little study. We investigate the adsorption ability of β-structure chitosan as well as FeIII and AlIII chitosan-metal complexes. Pristine β-chitosan shows lower adsorption abilities for dye, CrVI and fluoride ions compared with those for α-chitosan, mainly owing to having fewer –NH3+ groups on its surface. However, the anionic pollutant adsorption efficiency of β-chitosan is clearly enhanced when chelated with metal ions. A β-structure chitosan-Fe-Al complex displayed adsorption capacities of 621.45 mg g−1 and 144.53 mg g−1 for Acid Red 73 dye and fluoride ions, respectively, according to the fitted Langmuir–Freundlich model; and of more than 173.03 mg g−1 for CrVI, according to the Freundlich model. These values are much higher than those observed for α-structure chitosan-metal complexes. This enhancement effect on the sorptive behaviour of β-chitosan can be attributed to its loose structure. The polymer chains of β-chitosan are arranged in parallel with relatively weak intermolecular forces, which allows them to easily chelate metal ions. Anionic pollutants can then be efficiently adsorbed by the chelated metal ions in the chitosan-metal complex if the electrostatic attraction of the –NH3+ groups is weak. This investigation provides a better understanding of β-chitosan-based adsorbents for application to anionic pollutant adsorption and removal.

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H2O2-induced surface modification: A facile, effective and environmentally friendly pretreatment of chitosan for dyes removal

Cited by 60 publications

References 33 publications

Grapefruit peelings as a promising biosorbent for the removal of leather dyes and hexavalent chromium

Grapefruit peelings as a promising biosorbent for the removal of leather dyes and hexavalent chromium

Rapid Removal of Dyes by Carbonized Sludge: Process, Effects of Environmental Factors, and Mechanism

Tuning the adsorption behaviour of β-structure chitosan by metal binding

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