One-Step Synthesis of Cationic Hydrogel for Efficient Dye Adsorption and Its Second Use for Emulsified Oil Separation

Li, Daikun; Li, Qing; Bai, Ningning; Dong, Hongzhou; Mao, Daoyong

doi:10.1021/acssuschemeng.7b01083

Cited by 111 publications

(77 citation statements)

References 56 publications

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Section: Introductionmentioning

confidence: 99%

“…The excessive use of harmful dyes in the textile industry around the globe has caused serious pollution of aquatic environments, and most of the current studies have focused on the removal of insoluble suspended particulates. [1][2][3][4][5][6] In fact, water-soluble dyes with high dispersion and high stability in water are especially difficult to remove. [7][8][9][10] There are many treatment methods for dyeing wastewater, of which adsorption is one of the most commonly used methods with the selection of suitable adsorbents being the key factor.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and surface gel‐adsorption effect of multidimensional cross‐linking cationic cotton for enhancing purification of dyeing wastewater

Song

Sang

2018

J of Chemical Tech & Biotech

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BACKGROUND Dyeing wastewater has caused serious pollution of aquatic environments, and adsorption is one of the most commonly used water‐purification methods with selection of suitable adsorbents being the key factor. These factors motivated us to develop new, more efficient adsorbents to purify dyeing wastewater. RESULTS A surface cross‐linking co‐polymerization of triallylmethylammonium chloride (TAMAC) and grafting cotton with unsaturated bonds (G‐cotton) was designed to obtain multidimensional cationic cotton adsorbent (PT‐cotton) with a high cationic degree of substitution of 0.129. A surface gel‐adsorption effect of the multidimensional cationic construction on cotton surface occurring during PT‐cotton adsorption was discovered resulting in the PT‐cotton having an ultrahigh adsorption capacity for purifying dyeing wastewater. Compared to the untreated cotton, the adsorption capacity of the PT‐cotton was 1344.10 times higher. Compared to the widely used activated carbon, the adsorption capacity of the PT‐cotton was 145.31 times higher, and it was 11.05 and 7.25 times higher, respectively, than that of the similar G‐cotton and polycationic cotton (PF‐cotton) reported in our previous contribution. When PT‐cotton materials were used to fill filter columns, the dye solution flowing through the filter columns immediately became clear, and the dye removal percentage for the PT‐cotton filters reached 96.9%, which was clearly better than that of the activated carbon filter (26.2%). Moreover, the per‐unit amount of water purification from filtering purification of a dye solution using PT‐cotton was 7.02 times higher than that using PF‐cotton. CONCLUSIONS Obtained PT‐cotton has a greater potential for application in the purification of dyeing wastewater than the existing adsorbent materials. © 2018 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and surface gel‐adsorption effect of multidimensional cross‐linking cationic cotton for enhancing purification of dyeing wastewater

Song

Sang

2018

J of Chemical Tech & Biotech

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“…When installing functional units inside a gel structure (e.g. a ligand or a molecular host), either chemically or physically, reversible, responsive, and selective absorption processes can occur . Supramolecular approaches to embed functional moieties within gels remain rare …”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14] When installing functional units inside ag el structure (e.g.aligand or amolecular host), either chemically or physically,r eversible,r esponsive,and selective absorption processes can occur. [15][16][17][18] Supramolecular approaches to embed functional moieties within gels remain rare. [19][20][21][22] Cellulose nanocrystals (CNCs) are spindle-shaped particles obtained by the acid (H 2 SO 4 )hydrolysis of bulk cellulose.…”

Section: Introductionmentioning

confidence: 99%

Host–Guest Chemistry Within Cellulose Nanocrystal Gel Receptors

et al. 2020

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Cellulose nanocrystals (CNCs) spontaneously assemble into gels when mixed with a polyionic organic or inorganic salt. Here, we have used this ion‐induced gelation strategy to create functional CNC gels with a rigid tetracationic macrocycle, cyclobis(paraquat‐p‐phenylene) (CBPQT4+). Addition of [CBPQT]Cl4 to CNCs causes gelation and embeds an active host inside the material. The fabricated CNC gels can reversibly absorb guest molecules from solution then undergo molecular recognition processes that create colorful host–guest complexes. These materials have been implemented in gel chromatography (for guest exchange and separation), and as elements to encode 2‐ and 3‐dimensional patterns. We anticipate that this concept might be extended to design a set of responsive and selective gel‐like materials functioning as, for instance, water‐pollutant scavengers, substrates for chiral separations, or molecular flasks.

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“…[1][2][3][4][5] Water-soluble dyes are the main components in dyeing wastewater that are especially difficult to remove because they are highly dispersed in the water in stable molecular forms. [1][2][3][4][5] Water-soluble dyes are the main components in dyeing wastewater that are especially difficult to remove because they are highly dispersed in the water in stable molecular forms.…”

Section: Introductionmentioning

confidence: 99%

Switch Effect, Water‐Like State, and New Interaction Mechanism of an H‐Bonded Polycation–Polyacrylamide System to Realize Instant Decolorization of Dyeing Wastewater

Zhao

Bai

et al. 2019

Advanced Sustainable Systems

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technologies have been developed in the research literature, such as flocculation, adsorption, and oxidation decomposition. [12][13][14][15][16][17][18] Of these, flocculation is still more advantageous than the other technologies in the engineering applications of large-scale water treatment due to its simplicity, high efficiency, and cost-effectiveness. In engineering applications for dealing with dyeing wastewater, polycationic flocculants have been widely used as effective decolorization materials since their cations can produce electrostatic interactions with the watersoluble anionic dyes to form insoluble flocs for removing the colored dyes from water. [13,[19][20][21] According to the current understanding, the flocculation decolorization of dyeing wastewater primarily depends on the two basic processes of charge neutralization and bridging. [22][23][24] Small precipitations are first formed by the electrostatic interactions (i.e., charge neutralization) between the polycationic flocculants and the anionic dye (it takes a relatively long time as a rate-controlling step). Subsequently, the small precipitations can be gradually aggregated into the larger flocs by the bridging interactions (as the final structure assumes flocs). [25][26][27] The facts indicate that the formation, growth, and settlement of flocs in flocculation decolorization take more than 48 h, which is a very slow process. [28,29] Thus, an important breakthrough will be realizing fast decolorization for dealing with dyeing wastewater.To deal with the abovementioned problems, in essence, we deduce that if the attractive forces of the formed flocs of the flocculation decolorization could be further strengthened, then the stronger attractive forces would accelerate the formation, growth, and settlement of flocs so that the decolorization rate would be faster. Meanwhile, we also notice that the hydrogen bond is a strong interaction force that is not disturbed by the charge factors, suggesting that the incorporation of effective hydrogen bonding interactions within and between the formed flocs of the flocculation decolorization could be a good way to realize fast decolorization during the purification of dyeing wastewater. However, the roles of hydrogen bonds in the improvement of decolorization of dyeing wastewater have not been reported until now. As a preliminary exploration, as designed in this work, we selected the commonly existing A switch for controlling hydrogen bonds is incorporated into a polymerbased system of polyamine polycation and polyacrylamide, with an ultrahigh molecular weight of 18 million; a surprising process results whereby the apparent viscosity of the whole system suddenly plunges from 321 cps to below 6.5 cps, forming a new water-like phase state (WLPS) of an H-bonded polymer-based system. When WLPS products are used as decolorant materials to purify dyeing wastewater, they can flow similar to water during mass transfer and be quickly dissolved, immediately interacting with the anionic dyes in water. This observation i...

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One-Step Synthesis of Cationic Hydrogel for Efficient Dye Adsorption and Its Second Use for Emulsified Oil Separation

Cited by 111 publications

References 56 publications

Synthesis and surface gel‐adsorption effect of multidimensional cross‐linking cationic cotton for enhancing purification of dyeing wastewater

Synthesis and surface gel‐adsorption effect of multidimensional cross‐linking cationic cotton for enhancing purification of dyeing wastewater

Host–Guest Chemistry Within Cellulose Nanocrystal Gel Receptors

Switch Effect, Water‐Like State, and New Interaction Mechanism of an H‐Bonded Polycation–Polyacrylamide System to Realize Instant Decolorization of Dyeing Wastewater

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