Carboxymethyl cellulose thiol-imprinted polymers: Synthesis, characterization and selective Hg(II) adsorption

Velempini, Tarisai; Pillay, Kriveshini; Mbianda, Xavier Yangkou; Arotiba, Omotayo A.

doi:10.1016/j.jes.2018.11.022

Cited by 74 publications

(21 citation statements)

References 55 publications

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“…Cellulose is a biopolymer abundantly found in nature. It is a low cost, renewable, biodegradable, nontoxic, and environmentally harmless material, which is widely used in wastewater treatment, despite the fact that its adsorption capacity in its untreated form is limited (Kumari and Chauhan 2014;Velempini et al 2019). Thus, it is common to adopt the approach of chemical modification for improving the adsorption capacity of cellulose.…”

Section: Introductionmentioning

confidence: 99%

DMAEMA-grafted cellulose as an imprinted adsorbent for the selective adsorption of 4-nitrophenol

Lang

Shi

et al. 2021

Cellulose

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4-Nitrophenol is a highly toxic environmental pollutant. It is a challenge to selectively remove it from a mixture of various pollutants. Herein, we report a study on the selective adsorption of 4-nitrophenol by using molecularly imprinted polymers (MIPs). The imprinted polymer was synthesized using cellulose as a framework, onto which, the complex of the imprinting molecule (i.e., 4-nitrophenol) and a candidate material [namely, 2-(dimethylamino)ethyl methacrylate. DMAEMA] was grafted. The obtained MIP showed an excellent adsorption capacity with good selectivity. Also, the adsorption of 4-nitrophenol by the obtained MIP was fast and the adsorbent exhibited good recyclability. The thermodynamics and kinetics of the adsorption process of 4-nitrophenol by MIP was thoroughly studied, where an otherwise-equivalent non-imprinted polymer was used as a control in the experiments. The selectivity of the MIP adsorbent for 4-niteophenol was evaluated by two types of experiments: (1) adsorption experiments in single-component adsorbate systems (containing 4-nitrophenol, 3-nitrophenol, catechol, or hydroquinone), and (2) competitive adsorption experiments in binary adsorbate systems (containing 4-nitrophenol plus either 3-nitrophenol, catechol or hydroquinone). The selectivity coefficient for 4-nitrophenols was twice of those of other phenols (that were all around 2), indicative of the extent of the affinity of MIPs to these phenolic compounds. The recyclability of the adsorbent was evaluated for 5 adsorption–desorption cycles, where the adsorption capacity of the last cycle remained over 90.2% of that of the first cycle. Graphic Abstract

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Section: Introductionmentioning

confidence: 99%

DMAEMA-grafted cellulose as an imprinted adsorbent for the selective adsorption of 4-nitrophenol

Lang

Shi

et al. 2021

Cellulose

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“…The elution rate was over 95% eluted by the eluent system of 4% thiourea in 0.5 M HCl. Thiourea in HCl is frequently used for the desorption of Hg(II) from adsorbent surfaces because the sulfur and nitrogen present in thiourea can form a coordination interaction with Hg(II) ions, and because thiourea dissolved in HCl is expected to have more of a desorption effect (Velempini et al, 2019). Five cycles of adsorption-desorption were carried out on a single adsorbent sample and the results are shown in Table 6.…”

Section: Resultsmentioning

confidence: 99%

Amino- and Thiol- Polysilsesquioxane Simultaneously Coating on Poly(p-Phenylenetherephthal Amide) Fibers: Bifunctional Adsorbents for Hg(II)

Wang

et al. 2019

Front. Chem.

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A double reagents simultaneous functionalization (DRSF) was used to prepare porous polysilsesquioxane with NH 2 and SH bifunctional groups (PAMPSQ) coated poly( p -phenylenetherephthal amide) (PPTA) fibers adsorbents (PPTA-AM), via in situ condensations with aminopropyltriethoxysilane (APTES) and mercaptopropyltriethoxysilane (MPTES). The PAMPSQ coated on the PPTA surface was in the form of nanoparticles and its morphology varied with the proportion of the reactants. The PAMPSQ exhibited loose open meso- or macroporous features. The functional groups utilization of PAMPSQ was much higher than those of polysilsesquioxane on the mono-functional adsorbents with thiol or amino groups. The selective adsorption of PPTA-AM adsorbents for Hg(II) in binary component metal ion systems indicated their potential application in environmental remediation. The adsorption mechanism of Hg(II) onto PPTA-AM was proposed.

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“…The growing interest of the scientific community towards the preparation of new advanced materials by green routes, prompted researchers to use cellulose as backbone-based materials to prepare green and biodegradable MIPs. In the last years, several papers on the usage of cellulose and cellulose derivatives as key element in the preparation of biodegradable and biocompatible MIP and IIP were published [ 56 , 59 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 ]. The prepared cellulose-based imprinted polymers were used in many application fields ranging from drug delivery, separation science, and also in environmental analysis of pollutants.…”

Section: Different Biomass Waste In Mip Technologymentioning

confidence: 99%

Green Aspects in Molecularly Imprinted Polymers by Biomass Waste Utilization

et al. 2021

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Molecular Imprinting Polymer (MIP) technology is a technique to design artificial receptors with a predetermined selectivity and specificity for a given analyte, which can be used as ideal materials in various application fields. In the last decades, MIP technology has gained much attention from the scientific world as summarized in several reviews with this topic. Furthermore, green synthesis in chemistry is nowadays one of the essential aspects to be taken into consideration in the development of novel products. In accordance with this feature, the MIP community more recently devoted considerable research and development efforts on eco-friendly processes. Among other materials, biomass waste, which is a big environmental problem because most of it is discarded, can represent a potential sustainable alternative source in green synthesis, which can be addressed to the production of high-value carbon-based materials with different applications. This review aims to focus and explore in detail the recent progress in the use of biomass waste for imprinted polymers preparation. Specifically, different types of biomass waste in MIP preparation will be exploited: chitosan, cellulose, activated carbon, carbon dots, cyclodextrins, and waste extracts, describing the approaches used in the synthesis of MIPs combined with biomass waste derivatives.

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Carboxymethyl cellulose thiol-imprinted polymers: Synthesis, characterization and selective Hg(II) adsorption

Cited by 74 publications

References 55 publications

DMAEMA-grafted cellulose as an imprinted adsorbent for the selective adsorption of 4-nitrophenol

DMAEMA-grafted cellulose as an imprinted adsorbent for the selective adsorption of 4-nitrophenol

Amino- and Thiol- Polysilsesquioxane Simultaneously Coating on Poly(p-Phenylenetherephthal Amide) Fibers: Bifunctional Adsorbents for Hg(II)

Green Aspects in Molecularly Imprinted Polymers by Biomass Waste Utilization

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