Composites for wastewater purification: A review

Jaspal, Dipika; Malviya, Arti

doi:10.1016/j.chemosphere.2019.125788

Cited by 91 publications

(40 citation statements)

References 110 publications

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“…Nowadays, finding highly efficient systems for the removal of heavy metal ions (HMIs) from the aquatic environment is a stringent issue in front of the scientists all over the world, because they are highly toxic (even at low concentrations), not biodegradable, and have an accumulation tendency in living organisms-most of them being carcinogenic. Synthetic polymeric sorbents [1][2][3][4][5][6] and various biosorbents [7][8][9][10][11][12] are investigated for their performances in the recovery/removal of HMIs. Among the HMIs present in the wastewaters, chromium, especially Cr(VI), is one of the most dangerous contaminants of the surface and ground water, being considered a powerful carcinogenic and teratogenic agent threatening living organisms [1,2,11,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores

Drăgan¹,

Humelnicu

2020

Molecules

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Removal of Cr(VI) from the environment represents a stringent issue because of its tremendous effects on living organisms. In this context, design of sorbents with high sorption capacity for Cr(VI) is getting a strong need. For this purpose, poly(vinylbenzyl chloride), impregnated into porous silica (PSi), was cross-linked with either N,N,N’,N’-tetramethyl-1,2-ethylenediamine (TEMED) or N,N,N’,N’-tetramethyl-1,3-propanediamine, followed by the reaction of the free -CH2Cl groups with N,N-diethyl-2-hydroxyethylamine to generate strong base anion exchangers (ANEX) inside the pores. The PSi/ANEX composite sorbents were deeply characterized by FTIR spectroscopy, SEM-energy dispersive X-ray spectroscopy (EDX), thermogravimetric analysis (TGA), and water uptake. The sorption performances of composites against Cr(VI) were investigated as a function of pH, contact time, initial concentration of Cr(VI), and temperature. It was found that the cross-linker structure and the silica morphology are the key factors controlling the sorption capacity. The adsorption process was spontaneous and endothermic and well described by pseudo-second-order kinetic and Sips isotherm models. The maximum sorption capacity of 311.2 mg Cr(VI)/g sorbent was found for the composite prepared with mesoporous silica using TEMED as cross-linker. The PSi/ANEX composite sorbents represent an excellent alternative for the removal of Cr(VI) oxyanions, being endowed with fast kinetics, equilibrium in about 60 min, and a high level of reusability in successive sorption/desorption cycles.

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Section: Introductionmentioning

confidence: 99%

Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores

Drăgan¹,

Humelnicu

2020

Molecules

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“…Physicochemical and biochemical methods, such as chemical precipitation, oxidation-reduction, electrochemical, ion exchange, etc., were used to treat mercury-containing wastewater in the past [5,6]. However, these methods had the disadvantages of high cost and/or low processing efficiency [7].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Desorption Behaviors of Hg<sup>2+</sup> by <i>Microcystis aeruginosa</i>

Sun¹,

Fan²,

Yang³

2021

Pol. J. Environ. Stud.

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The adsorption and desorption behaviors of Hg 2+ by living and dead Microcystis aeruginosa in aqueous solution were investigated. The results showed that both living and dead Microcystis aeruginosa can effectively adsorb Hg 2+ , the equilibrium adsorption capacity and rate increased with the increasing abundance of algae. The maximum adsorption amount of Hg 2+ to living and dead Microcystis aeruginosa was 2.13×10-2 and 1.11×10-2 ng 10-6 cells, respectively. The adsorption processes of Hg 2+ by living Microcystis aeruginosa were biosorption and bioconcentration, whereas by dead Microcystis aeruginosa were only biosorption. Both pseudo-first-order and pseudo-second-order kinetics model can well describe the adsorption of Hg 2+ by living and dead Microcystis aeruginosa, suggesting that adsorption processes might be predominantly controlled by a combined reaction of diffusion and chemical process. The adsorption characteristics were well illustrated by both Langmuir and Freundlich isotherm model, and Langmuir model can describe adsorption characteristics better. These demonstrated that there were strong interactions between Microcystis aeruginosa and mercuric ion, and Microcystis aeruginosa adsorbed Hg 2+ were favorable processes through monolayer adsorption predominantly. The desorption processes of Hg 2+ by Microcystis aeruginosa can be divided into three stages, i.e. the desorption amount of Hg 2+ increased quickly within 0-60 min, the rate of desorption became very slow within 60-120 min, and tended to be balanced after 120 min.

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“…Water uptake property of hydrogels or "hungry networks" accounts for a great number of biomedical and technological applications. Highly swollen polymeric gel with the ability to absorb water in high amounts is again under investigation, because of their potential applications in bioengineering, biomedicine, and other related areas [1] [2] [3]. Hydrogels are three-dimensional networks of hydrophilic polymer chains with properties in between liquids and solids.…”

Section: Introductionmentioning

confidence: 99%

“…Advanced novel polymers have promising potentials for development and application in this area, because of a variety of some physicochemical properties (form, size, size distribution, porosity, etc.) that can be tailored and possibility of their modification by inserting various functional groups, their sensitivity to change of the external stimuli and general reversibility of adsorption process, enabled by easy and complete regeneration without significant decrease in adsorption capacities [1] [2] [3]. Polymer/clay or polymer/zeolite hybrid composite polymeric systems have received great attention because of their relatively low production cost and high adsorption capacity for water, some dyes and metal.…”

Section: Introductionmentioning

confidence: 99%

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Water Sorption Behaviors of Novel Biohybrid Hydrogels as Effective Sorbents in Water-Solvent Binary Mixtures

Karadağ¹,

Yel²,

Kundakcı³

et al. 2020

JEAS

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Novel sorbent hydrogels containing acrylamide/sodium vinylsulfonate, carboxymethyl cellulose and zeolite were synthesized with free radical solution polymerization by using ammonium persulfate/N,N,N',N'-tetramethylethylenediamine as redox initiating pair in presence of poly(ethylene glycol) diacrylate as crosslinker. It was to investigate the water uptake properties of series of the novel hydrogels, the semi IPNs and the hybrid/biohybrid composite hydrogel sorbents synthesized in this study. Water uptake studies were performed in water and in water-solvent (acetone, methanol and tetrahydrofuran) binary mixtures at 25˚C, gravimetrically. Some swelling and diffusion parameters were calculated and discussed. It has been seen that the lower equilibrium swelling factor values in all solvent compositions in comparison with the equilibrium swelling factor values in water.

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Composites for wastewater purification: A review

Cited by 91 publications

References 110 publications

Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores

Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores

Adsorption and Desorption Behaviors of Hg<sup>2+</sup> by <i>Microcystis aeruginosa</i>

Water Sorption Behaviors of Novel Biohybrid Hydrogels as Effective Sorbents in Water-Solvent Binary Mixtures

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