Self-assembled hydrogels constructed via host-guest polymers with highly efficient dye removal capability for wastewater treatment

Hou, Nan; Wang, Ran; Wang, Fan; Bai, Jiahui; Jiao, Tifeng; Bai, Zhenhua; Zhang, Lexin; Zhou, Jingxin; Peng, Qiuming

doi:10.1016/j.colsurfa.2019.123670

Cited by 23 publications

(8 citation statements)

References 61 publications

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“…from aqueous solution ( Figure 4 ) [ 135 ]. Li et al [ 136 ] demonstrated both electrostatic and hydrophobic interactions between MB dye and functional groups (–SH and –OH) present in thiol-modified CMC/L-cysteine HG. Hydrophobic interactions in CBHs offer extensive opportunities in HG engineering because of their roles in enriching mechanical properties [ 137 , 138 ].…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Cellulose-Based Hydrogels for Wastewater Treatment: A Concise Review

Akter

Bhattacharjee

Dhar

et al. 2021

Gels

111

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Finding affordable and environment-friendly options to decontaminate wastewater generated with heavy metals and dyes to prevent the depletion of accessible freshwater resources is one of the indispensable challenges of the 21st century. Adsorption is yet to be the most effective and low-cost wastewater treatment method used for the removal of pollutants from wastewater, while naturally derived adsorbent materials have garnered tremendous attention. One promising example of such adsorbents is hydrogels (HGs), which constitute a three-dimensional polymeric network of hydrophilic groups that is highly capable of adsorbing a large quantity of metal ions and dyes from wastewater. Although HGs can also be prepared from synthetic polymers, natural polymers have improved environmental benignity. Recently, cellulose-based hydrogels (CBHs) have been extensively studied owing to their high abundance, biodegradability, non-toxicity, and excellent adsorption capacity. This review emphasizes different CBH adsorbents in the context of dyes and heavy metals removal from wastewater following diverse synthesis techniques and adsorption mechanisms. This study also summarizes various process parameters necessary to optimize adsorption capacity followed by future research directions.

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Section: Adsorption Mechanismmentioning

confidence: 99%

Cellulose-Based Hydrogels for Wastewater Treatment: A Concise Review

Akter

Bhattacharjee

Dhar

et al. 2021

Gels

111

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“…However, the obtained Gel-A exhibited better dye adsorption capacity than Gel-D, which was possibly attributed to the electrostatic interaction between MB/RhB and the gel, which is considered to be the main factor in the adsorption process. 31,35 On the other hand, the regeneration of the absorbent material is also one of the important factors. For the obtained hydrogel adsorbents, the hydrogel component during regeneration showed a slight loss after washing with a strong acid solvent, and the reusability performance does seem less optimistic (Table 3).…”

Section: Preparation and Characterization Of Hydrogelmentioning

confidence: 99%

Fabrication of Hydrogels via Host–Guest Polymers as Highly Efficient Organic Dye Adsorbents for Wastewater Treatment

Hou

Wang

et al. 2020

ACS Omega

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New self-assembled hydrogel materials of poly(vinyl alcohol)/cyclodextrinmodified poly(acrylic acid)/azobenzene-modified poly(acrylic acid) (PVA/PAA-CD/PAA-Azo) were successfully prepared via host−guest interactions and hydrogen bonds. The asprepared hydrogel materials were characterized by various techniques, including Fourier transform infrared spectroscopy, X-ray diffraction analysis, scanning electron microscopy, ultraviolet spectroscopy, and specific surface area tests. The prepared hydrogels with different concentrations of PVA exhibited different network structures. In addition, ultraviolet (UV) light irradiation and temperature change induce a gel−sol phase transition in the hydrogel materials. The obtained hydrogel materials could be used as good adsorbents for two model organic dye molecules, which was mainly due to electrostatic interactions between methylene blue/rhodamine B (MB/RhB) and the gels in the adsorption process. In particular, the adsorption processes of the as-prepared hydrogel materials conformed to the pseudo-firstorder model with a high correlation coefficient, which indicates that gel has a potential application in the field of wastewater purification.

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“…As a typical class of building blocks to construct supramolecular materials, low-molecular-weight gelators (LMWGs) could self-assemble into smart supramolecular gels via warming and cooling cycle, sonicating, or shaking at room temperature. − The resulting gels exhibited specific 3D mesh structures possessing a characteristic of both solid and liquid phases, making them a unique class of “soft matter” . Their potential applications in areas such as tissue engineering, , carriers for controlled drug release, , and the detection and removal of contaminants − required the materials to ideally exhibit different rheological properties. Since the rheological behaviors of a gel decide where it is used, therefore, to tune gel rheology according to real applications has become one of the primary goals of the gel field.…”

Section: Introductionmentioning

confidence: 99%

Tuning Rheological Behaviors of Supramolecular Aqueous Gels via Charge Transfer Interactions

Yang

Shen

et al. 2021

Langmuir

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Rheological properties are critical for determining real applications of supramolecular gels in various fields. Correspondingly, the modulation of gel rheology will be very important for meeting real requirements. In this aspect, a few strategies were applied to tune the rheological behaviors of supramolecular gels, but some specific interactions like charge transfer (CT) interactions were less explored at the molecular level. Herein, we report a pyrene-containing derivative of diphenylalanine as a donor gelator and naphthalenediimide or 3,5dinitrobenzene as matching acceptor molecules. It was found that the viscoelastic properties and strength of the original gel could be tuned through addition of different acceptor molecules to the original gel with changing the ratios of the selected acceptor molecules. As a result, storage modulus was continuously adjusted over a wide range from 190,000 to 50,000 Pa by CT interactions. Furthermore, the mechanism of the CT-induced change in rheological properties was understood and clarified through relevant techniques (e.g., UV−Vis, fluorescence, and FT-IR spectroscopy and TEM). The findings in this work would provide a novel strategy to modulate the rheological properties of supramolecular gels for adaption to broader fields of real applications.

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Self-assembled hydrogels constructed via host-guest polymers with highly efficient dye removal capability for wastewater treatment

Cited by 23 publications

References 61 publications

Cellulose-Based Hydrogels for Wastewater Treatment: A Concise Review

Cellulose-Based Hydrogels for Wastewater Treatment: A Concise Review

Fabrication of Hydrogels via Host–Guest Polymers as Highly Efficient Organic Dye Adsorbents for Wastewater Treatment

Tuning Rheological Behaviors of Supramolecular Aqueous Gels via Charge Transfer Interactions

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