Smart Adsorbents for Aquatic Environmental Remediation

Zare‬, Ehsan Nazarzadeh; Mudhoo, Ackmez; Khan, Moonis Ali; Otero, Marta; Bundhoo, Zumar M.A.; Patel, Manvendra; Srivastava, Ashwini K.; Navarathna, Chanaka; Mlsna, Todd; Mohan, Dinesh; Pittman, Charles U.; Makvandi, Pooyan

doi:10.1002/smll.202007840

Cited by 42 publications

(18 citation statements)

References 327 publications

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“…The sorption processes of some lanthanides using graphene oxide and its composites from an aqueous solution have been reviewed (Ali et al 2019;Asadollahzadeh et al 2021;Nazarzadeh Zare et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide modified with carboxymethyl cellulose for high adsorption capacities towards Nd(III) and Ce(III) from aqueous solutions

2022

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This work addresses a simple method to functionalize graphene oxide with sodium carboxymethyl cellulose using tetraethyl orthosilicate as a linker for rapid and significant removal of Nd(III) and Ce(III) from aqueous solutions. The prepared composite (GO–CMC) was characterized by different techniques to confirm the modification and adsorption process. The sorption performance of the GO–CMC was evaluated using Nd(III) and Ce(III) as absorbent materials. The experimental results demonstrated that the sorption process was excellently fitted by the pseudo-second-order kinetic model. The adsorption results were also analyzed by different isotherm models. According to the Langmuir isotherm model, the experimental sorption capacities at pH 3.0 was 661.21 and 436.55 mg/g for Nd(III) and Ce(III), respectively. The thermodynamic results indicated that the sorption process of the two examined metal ions was endothermic and spontaneous. The regenerated GO–CMC composite has a similar removal percentage to the original composite. These results confirmed that the prepared composite (GO–CMC) could be used as an effective adsorbent for Nd(III) and Ce(III) from certain multielement solutions.

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Section: Introductionmentioning

confidence: 99%

Graphene oxide modified with carboxymethyl cellulose for high adsorption capacities towards Nd(III) and Ce(III) from aqueous solutions

2022

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“…biosensor [11], wound healing [12], bio-separation [13], tissue engineering [14] and environmental applications like adsorption [15]. Smart hydrogels are categorized based on the type of the stimuli that caused their swelling behavior.…”

Section: Introductionmentioning

confidence: 99%

“…The progress of the reaction was followed through UV-Vis spectrophotometer in the range of 200-400 nm wavelengths at different time intervals (0, 2 and 4 min). The experiment was repeated at 45 ˚C and monitored at time intervals of5,10,15,20,25,30, 35, 40, 45, 50 and 55 min while other conditions were constant.…”

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confidence: 99%

Kinetic and Equilibrium Function and Switchable Catalytic Activity of Some Thermo-Responsive Hydrogel Metal Absorbents Based on Modified PNIPAM

Ghasemi

Owrang

Javaheri

2022

Preprint

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Synthesis and identification of some thermo-responsive hydrogel metal absorbents based on Schiff base modified PNIPAM is described. PNIPAM hydrogel is produced through conventional free-radical polymerization method. The hydrogel is amino modified with different amines and then treated with various aldehydes to make polymeric Schiff-bases supposing to utilize as an absorbent for Cu salt. Characterization of the as-prepared hydrogels was performed properly and confirmed the corresponding structures. Kinetic and equilibrium function of the absorbents and the effect of distinct variables like pH, adsorbent amount and contact time in the absorption process are investigated in detail. Kinetic and adsorption isotherm data agreed with pseudo-second order model and Langmuir isotherm, respectively. The maximum value of adsorption capacity of the prepared adsorbent was around 8550 mg g-1. In addition, the corresponding switchable catalytic activity using one of the thermo-responsive hydrogel metal absorbents in the reduction of 4-nitro phenol to 4-amino phenol in the role of model reaction is examined.

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“…Water contamination from natural processes and anthropogenic activities has potential toxic effects due to rapid transportation, bioaccumulation, and biomagnification of organic and inorganic contaminants from abiotic to biotic ecosystems. − The remediation of heavy metals from wastewater is challenging due to the lack of sustainable, feasible, and effective technologies. Adsorption is a widely accepted and low-cost remediation approach in comparison to other removal techniques, including oxidation, precipitation, coagulation, membrane-based separation, electro flotation, biofiltration, and electrodialysis. ,− Various adsorbents, including biochar, clay, graphene oxides, carbon nanotubes, metal nanoparticles, nanomaterials, polymers, and nanocomposites have been widely utilized to remove organic and inorganic contaminants including heavy-metal ions over the past decade. ,,− The application of conventional adsorbents is limited in relation to selectivity, competitive sorption, and easy separation after sorption . Biocompatible stabilization of nanosized adsorbents in the form of beads can be utilized to overcome such problems.…”

Section: Introductionmentioning

confidence: 99%

“…7,8,10−15 The application of conventional adsorbents is limited in relation to selectivity, competitive sorption, and easy separation after sorption. 16 Biocompatible stabilization of nanosized adsorbents in the form of beads can be utilized to overcome such problems. The polymerization of nano/microsize adsorbents could immobilize and stabilize in and around biopolymer beads, stimulating easy separation of the adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Biopolymer Architecture Enhanced the Adsorption and Selectivity of Aqueous Heavy-Metal Ions

Hassan¹,

Liu²,

Naidu³

et al. 2021

ACS Omega

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Halloysite nanotubes (HNT) and ball-milled biochar (BC) incorporated biocompatible mesoporous adsorbents (HNT-BC@Alg) were synthesized for adsorption of aqueous heavy-metal ions. HNT-BC@Alg outperformed the BC, HNT, and BC@Alg in removing cadmium (Cd), copper (Cu), nickel (Ni), and lead (Pb). Mesoporous structure (∼7.19 to 7.56 nm) of HNT-BC@Alg was developed containing an abundance of functional groups induced from encapsulated BC and tubular HNT, which allowed heavy metals to infiltrate and interact with the adsorbents. Siloxane groups from HNT, oxygen-containing functional groups from BC, and hydroxyl and carboxyl groups from alginate polymer play a significant role in the adsorption of heavy-metal ions. The removal percentage of heavy metals was recorded as Pb (∼99.97 to 99.05%) > Cu (∼95.01 to 90.53%) > Cd (∼92.5 to 55.25%) > Ni (∼80.85 to 50.6%), even in the presence of 0.01/0.001 M of CaCl 2 and Na 2 SO 4 as background electrolytes and charged organic molecule under an environmentally relevant concentration (200 μg/L). The maximum adsorption capacities of Ni, Cd, Cu, and Pb were calculated as 2.85 ± 0.08, 6.96 ± 0.31, 16.87 ± 1.50, and 26.49 ± 2.04 mg/g, respectively. HNT-BC@Alg has fast sorption kinetics and maximum adsorption capacity within a short contact time (∼2 h). Energy-dispersive X-ray spectroscopy (EDS) elemental mapping exhibited that adsorbed heavy metals co-distributed with Ca, Si, and Al. The reduction of surface area, pore volume, and pore area of HNT-BC@Alg (after sorption of heavy metals) confirms that mesoporous surface (2–18 nm) supports diffusion, infiltration, and interaction. However, a lower range of mesoporous diameter of the adsorbent is more suitable for the adsorption of heavy-metal ions. The adsorption isotherm and kinetics fitted well with the Langmuir isotherm and the pseudo-second-order kinetic models, demonstrating the monolayer formation of heavy-metal ions through both the physical sorption and chemical sorption, including pore filling, ion exchange, and electrostatic interaction.

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Smart Adsorbents for Aquatic Environmental Remediation

Abstract: He is an interfacial chemist, and his research is focused in the synthesis and development of novel materials for environmental remediation applications.

Cited by 42 publications

References 327 publications

Graphene oxide modified with carboxymethyl cellulose for high adsorption capacities towards Nd(III) and Ce(III) from aqueous solutions

Graphene oxide modified with carboxymethyl cellulose for high adsorption capacities towards Nd(III) and Ce(III) from aqueous solutions

Kinetic and Equilibrium Function and Switchable Catalytic Activity of Some Thermo-Responsive Hydrogel Metal Absorbents Based on Modified PNIPAM

Mesoporous Biopolymer Architecture Enhanced the Adsorption and Selectivity of Aqueous Heavy-Metal Ions

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