Highly efficient adsorption of chlorophenols onto chemically modified chitosan

Zhou, Liang-Chun; Meng, Xiang‐Gao; Fu, Jijiang; Yang, Yuchong; Yang, Peng; Chun, Myung‐Suk

doi:10.1016/j.apsusc.2013.12.041

Cited by 87 publications

(26 citation statements)

References 43 publications

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“…In cases when n s = 1, this implies that multiple adsorption sites may exist for such CGi materials. This is supported by the fact that glutaraldehyde in solution contains different isomeric forms and the degree of cross- A source of comparison of the sorption properties of chitosan-based materials is found in the work of Zhou et al where they report on the sorption of 2,4-DCP with chitosan polymers that contain b-CD (Zhou et al 2014b). The Q m value reported in their study is 316 mg/g at pH 5 while that for the CG3 polymer is 118 mg/g.…”

Section: Sorption Of the Chlorophenolsmentioning

confidence: 93%

“…Chitosan is a versatile polysaccharide due to its amenability to synthetic modification such as grafting or cross-linking to produce materials with tunable physicochemical properties. Although there are reports (Kyzas et al 2008(Kyzas et al , 2014(Kyzas et al , 2013Poon et al 2014;Zhang et al 2014;Zhou et al 2014b) describing the sorption of chitosan-based materials with dyes and other organic species, there is only one study which reports the sorption of chlorophenols with chitosan copolymers that contain b-cyclodextrin (Zhou et al 2014b). Cross-linked polymers containing chitosan and glutaraldehyde have been reported with and without b-cyclodextrin.…”

Section: Introductionmentioning

confidence: 96%

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Sequestration of agrochemicals from aqueous media using cross-linked chitosan-based sorbents

Mohamed

Wilson

2016

Adsorption

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The sorption properties are reported for chitosan and its cross-linked forms (chitosan-glutaraldehyde; CG) with some model agrochemical sorbates [pentachlorophenol (PCP), 2,4-dichlorophenol (2,4-DCP) and 2,4-dichlorophenoxy acetic acid (2,4-D), dicamba and carbofuran]. The CG cross-linked materials were prepared at variable C:G monomer mole ratios: 1:0.5 (CG1), 1:1 (CG2), (CG3). The sorbents were characterized using diffuse reflectance infrared Fourier transform spectroscopy, thermogravimetric analysis and a dye sorption method using phenolphthalein. The sorption studies were carried out in aqueous solution at pH 9 except for dicamba and carbofuran (pH 7). The isotherm results were evaluated by the Sips, Freundlich, and Langmuir models. The Sips model provided the ''best-fit'' results where the sorption capacity increased as the cross-linker content of the CG materials increased. The relative uptake for chitosan and its cross-linked forms adopted the following order: PCP [ 2,4-DCP [ 2,4-D. In the case of dicamba and carbofuran, the former had a higher sorptive uptake. The variable uptake of the sorbates were attributed to their relative lipophilicity where the main driving force of these solid-solution systems relates to hydrophobic effects, in accordance with the tunable physicochemical properties of the chitosan sorbent materials.

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Section: Sorption Of the Chlorophenolsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 96%

Sequestration of agrochemicals from aqueous media using cross-linked chitosan-based sorbents

Mohamed

Wilson

2016

Adsorption

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“…Among these sorbent materials, activated carbons are the most widely used and exhibit good adsorption capacities for many organic pollutants due to their porous structures and large surface areas (Aksu and Yener 2001;Anbia and Ghaffari 2009;Nath and Bhakhar 2010;Zhou et al 2014). However, the application of activated carbons can be limited by a range of factors, including high cost, poor adsorption selectivity, poor mechanical strength, and expensive and difficult regeneration (Ferro-Garcia et al 1996;Anbia and Ghaffari 2009;Anbia and Lashgari 2009;Ahmad et al 2011;Shah et al 2011).…”

Section: Responsible Editor: Philippe Garrigues Submitted To: Environmentioning

confidence: 99%

Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid

Yang

Cheng

2016

Environ Sci Pollut Res

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Sorption of 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP), and 2,4,6-trichlorophenol (2,4,6-TCP) on a range of dealuminated zeolites were investigated to understand the mechanism of their sorption on microporous minerals, while the influence of common metal cations, solution pH, and humic acid was also studied. Sorption of chlorophenols was found to increase with the hydrophobicity of the sorbates and that of the microporous minerals, indicating the important role of hydrophobic interactions, while sorption was also stronger in the micropores of narrower sizes because of greater enhancement of the dispersion interactions. The presence of metal cations could enhance chlorophenol sorption due to the additional electrostatic attraction between metal cations exchanged into the mineral micropores and the chlorophenolates, and this effect was apparent on the mineral sorbent with a high density of surface cations (2.62 sites/nm 2 ) in its micropores. Under circum-neutral or acidic conditions, neutral chlorophenol molecules adsorbed into the hydrophobic micropores through displacing the Bloosely bound^water molecules, while their sorption was negligible under moderately alkaline conditions due to electrostatic repulsion between the negatively charged zeolite framework and anionic chlorophenolates. The influence of humic acid on sorption of chlorophenols on dealuminated Y zeolites suggests that its molecules did not block the micropores but created a secondary sorption sites by forming a Bcoating layer^on the external surface of the zeolites. These mechanistic insights could help better understand the interactions of ionizable chlorophenols and metal cations in mineral micropores and guide the selection and design of reusable microporous mineral sorbents for sorptive removal of chlorophenols from aqueous stream.

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“…Among these proposed methods, adsorption is an effective method for the removal of phenolic compounds from wastewater due to its simplicity and easy operation process. A variety of adsorbents were used to remove phenolic pollutants from wastewater including activated carbon , fly ash (Srivastava et al 2006;Chaudhary and Balomajumder 2014), polymers (Huang et al 2013;Pacurariu et al 2013), mesoporous sieves (Fu et al 2011), chitosan (Zhou et al 2014), zeolites (Yousef et al 2011) and silica (Qin et al 2013). LorencGrabowska et al (2013) reported that the adsorption Electronic supplementary material The online version of this article (doi:10.1007/s13762-015-0827-9) contains supplementary material, which is available to authorized users.…”

Section: Introductionmentioning

confidence: 99%

Preparation of amino functionalized imidazolium-modified silicas by different coupling agents for removal of 2,4-dinitrophenol from aqueous solutions

Wang

2015

Int. J. Environ. Sci. Technol.

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Amino group exhibits alkaline properties. Amino functionalized imidazole-modified silicas would benefit the adsorption of phenolic compounds. Coupling agent between the silica and the imidazolium ring has an effect on adsorption performance. In this paper, two adsorbents were synthesized for the surface bonding of N-(3-aminopropyl)-imidazole onto silicas modified by 3-chloropropyltriethoxysilane and 3-mercaptopropyltrimethoxysilane, respectively. Infrared spectra, elemental analysis, thermogravimetric analysis and N 2 adsorptiondesorption isotherms were used to characterize the two adsorbents, and their adsorption capacities of 2,4-dinitrophenol from aqueous solutions were investigated in detail. The experimental results indicated that amino group plays an important role in the enhancement of adsorption capacities of 2,4-dinitrophenol. The adsorbent with 3-mercaptopropyltrimethoxysilane as coupling agent exhibited lower adsorption capacity due to a weak electron-electron repulsion between the non-bonding electrons of sulfur atom and p electrons of benzene ring of 2,4-dinitrophenol. The adsorption kinetics fitted well with pseudo-second-order model. The two adsorbents could be regenerated and reused eight times at least by washing with HCl. The adsorption mechanism was also discussed.

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Highly efficient adsorption of chlorophenols onto chemically modified chitosan

Cited by 87 publications

References 43 publications

Sequestration of agrochemicals from aqueous media using cross-linked chitosan-based sorbents

Sequestration of agrochemicals from aqueous media using cross-linked chitosan-based sorbents

Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid

Preparation of amino functionalized imidazolium-modified silicas by different coupling agents for removal of 2,4-dinitrophenol from aqueous solutions

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