Dual-porosity Mn2O3 cubes for highly efficient dye adsorption

Shao, Yongjiu; Ren, Bin; Jiang, Hanmei; Zhou, Bingjie; Lv, Liping; Ren, Jingzheng; Dong, Lichun; Li, Jing; Liu, Zhenfa

doi:10.1016/j.jhazmat.2017.03.014

Cited by 58 publications

(22 citation statements)

References 53 publications

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“…Up to now, many approaches have been developed to deal with dye contaminants in wastewater, including adsorption [ 8 , 9 ], flocculation [ 10 ], coagulation [ 11 ], electrolysis [ 12 ], biodegradation [ 13 ], and photocatalytic degradation [ 14 , 15 , 16 ]. Among these methods and techniques, adsorption is considered to be a promising strategy due to its inherently high efficiency, economic feasibility, good biocompatibility, and simplicity in operation [ 6 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient, Rapid, and Simultaneous Removal of Cationic Dyes from Aqueous Solution Using Monodispersed Mesoporous Silica Nanoparticles as the Adsorbent

et al. 2017

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In this work, a highly efficient and rapid method for simultaneously removing cationic dyes from aqueous solutions was developed by using monodispersed mesoporous silica nanoparticles (MSNs) as the adsorbents. The MSNs were prepared by a facile one-pot method and characterized by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, and Brunauer-Emmett-Teller. Experimental results demonstrated that the as-prepared MSNs possessed a large specific surface area (about 585 m2/g), uniform particle size (about 30 nm), large pore volume (1.175 cm3/g), and narrow pore size distribution (1.68 nm). The materials showed highly efficient and rapid adsorption properties for cationic dyes including rhodamine B, methylene blue, methyl violet, malachite green, and basic fuchsin. Under the optimized conditions, the maximum adsorption capacities for the above mentioned cationic dyes were in the range of 14.70 mg/g to 34.23 mg/g, which could be achieved within 2 to 6 min. The probable adsorption mechanism of MSNs for adsorption of cationic dyes is proposed. It could be considered that the adsorption is mainly controlled by electrostatic interactions and hydrogen bonding between the cationic dyes and MSNs. As a low-cost, biocompatible, and environmentally friendly material, MSNs have a potential application in wastewater treatment for removing some environmental cationic contaminants.

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Section: Introductionmentioning

confidence: 99%

Highly Efficient, Rapid, and Simultaneous Removal of Cationic Dyes from Aqueous Solution Using Monodispersed Mesoporous Silica Nanoparticles as the Adsorbent

et al. 2017

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“…However, there are few reports studying adsorption for the removal of lignins in water. [26][27][28][29] One reason for this may be the fact that adsorption forces between the existing adsorbent materials (e.g., activated carbon) and pollutants are very weak, being mainly intermolecular forces. 30,31 On the other hand, the large macromolecule skeletons of lignins (Scheme 1) hinder interactions between lignins and adsorbents due to steric hindrance effects.…”

Section: Introductionmentioning

confidence: 99%

Superefficient removal of lignins from papermaking wastewater by polycationic adsorption and direct reuse of wastes: structure–activity relationships and interaction mechanisms

Bai

Yang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: As a complex phenol polymer pollutant, lignin is the most difficult to remove in papermaking wastewater. RESULTS: This work first found a strong adsorbent for highly efficient removal of lignins and realized the direct reuse of its wastes. Through systemically screening the serial molecular structures of polycationic adsorbents previously developed, a highly permeable polycationic gel (PPG) adsorbent was discovered to be the most suitable for lignin removal. The maximum adsorption capacity of PPG for the lignins was 3891.65 mg/g, that is, the masses of adsorbed lignins were 3.89 times higher than that of PPG. Interestingly, after adsorbing the lignins, PPG wastes could be directly reused, without any treatment, for purifying dyeing wastewater. The adsorption capacity of PPG wastes reused for adsorbing the anionic dyes was 245.05 times higher than that of the existing activated carbon, indicating that PPG wastes maintained excellent adsorption ability for purifying the dyeing wastewater. A series of simulation experiments and instrument analyses were carried out to detect the new adsorption effect of PPG. The high water-permeability of PPG allows for complete permeability of the lignins and easy adsorption inside PPG. After adsorption, shrinkage of the internal structure of PPG and aggregation of the adsorbed lignins on the surface of PPG enhanced the adsorption intensity of PPG toward the lignins. CONCLUSION: This indicated that PPG had a super-high adsorption ability for direct removal of lignins from water by adsorption, which marked the first successful report of reused wastes utilized for treating other waste pollutants.

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“…Thus, the removal of colored water‐soluble dyes (i.e., decolorization) should be regarded as one of the most critical steps in the entire purification process of dyeing wastewater . Several useful decolorization technologies have been developed in the research literature, such as flocculation, adsorption, and oxidation decomposition . 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.…”

Section: Introductionmentioning

confidence: 99%

“…[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. [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.…”

mentioning

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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Dual-porosity Mn2O3 cubes for highly efficient dye adsorption

Cited by 58 publications

References 53 publications

Highly Efficient, Rapid, and Simultaneous Removal of Cationic Dyes from Aqueous Solution Using Monodispersed Mesoporous Silica Nanoparticles as the Adsorbent

Highly Efficient, Rapid, and Simultaneous Removal of Cationic Dyes from Aqueous Solution Using Monodispersed Mesoporous Silica Nanoparticles as the Adsorbent

Superefficient removal of lignins from papermaking wastewater by polycationic adsorption and direct reuse of wastes: structure–activity relationships and interaction mechanisms

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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