Polysaccharide-Based Composite Hydrogels as Sustainable Materials for Removal of Pollutants from Wastewater

Ghiorghiță, Claudiu-Augustin; Dinu, Maria Valentina; Lazăr, Maria; Drăgan, Ecaterina Stela

doi:10.3390/molecules27238574

Cited by 24 publications

(5 citation statements)

References 189 publications

(311 reference statements)

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“…Cr(VI) compounds present as HCrO 4 − , CrO 4 2− and Cr 2 O 7 2− oxyanions (depending on pH and Cr(VI) concentration) are known for their toxicity, high solubility and high diffusivity, which allow them to easily cross the cellular membrane [ 6 ]. Cr(VI) is carcinogenic and mutagenic for living organisms and has a corrosive effect on tissues, causing pulmonary congestion and damage of the liver, stomach and kidney [ 6 , 7 ]. Therefore, the World Health Organization has limited the total concentration of chromium in drinking water to 0.05 mg/L.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, various methodologies have been employed to decrease the chromium concentration under this limit, such as precipitation, ion exchange, membrane filtration, reverse osmosis and adsorption. Among all known techniques in use for the removal of Cr(VI), adsorption technology is the most widely explored due to its intrinsic advantages, such as lower capital costs, effectiveness, environmental friendliness, due to the absence of further waste materials, and high effectiveness at low concentrations of pollutant compared with other methods [ 3 , 6 , 7 ]. It is still a challenge to design novel sorbents endowed with enhanced sorption capacity and high stability during utilization.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing attention has been recently focused on using composite hydrogels in environmental remediation, where they have outcompeted many of the conventional adsorbents by their sorption performances such as fast sorption kinetics and high sorption capacity. Chitosan (CS)-based composites are among the most investigated bio-sorbents with clear performances in the removal of various pollutants [ 7 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Sustainable Multi-Network Cationic Cryogels for High-Efficiency Removal of Hazardous Oxyanions from Aqueous Solutions

Drăgan¹,

Humelnicu

Dinu³

2023

Polymers

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It is still a challenge to develop advanced materials able to simultaneously remove more than one pollutant. Exclusive cationic composite double- and triple-network cryogels, with adequate sustainability in the removal of Cr2O72− and H2PO4− oxyanions, were developed in this work starting from single-network (SN) sponges. Chitosan (CS), as the only polycation originating from renewable resources, and poly(N,N-dimethylaminoethylmethacrylate) (PDMAEMA) and polyethyleneimine (PEI), as synthetic polycations, were employed to construct multi-network cationic composite cryogels. The properties of the composites were tailored by the cross-linking degree of the first network (SN5 and SN20, which means CS with 5 or 20 mole % of glutaraldehyde, respectively) and by the order of the successive networks. FTIR, SEM-EDX, equilibrium water content and compressive tests were used in the exhaustive characterization of these polymeric composites. The sorption performances towards Cr2O72− and H2PO4− anions were evaluated in batch mode. The pseudo-first-order, pseudo-second-order (PSO) and Elovich kinetics models, and the Langmuir, Freundlich and Sips isotherm models were used to interpret the experimental results. The adsorption data were the best fitted by the PSO kinetic model and by the Sips isotherm model, indicating that the sorption mechanism was mainly controlled by chemisorption, irrespective of the structure and number of networks. The maximum sorption capacity for both oxyanions increased with the increase in the number of networks, the highest values being found for the multi-network sponges having SN5 cryogel as the first network. In binary systems, all sorbents preferred Cr2O72− ions, the selectivity coefficient being the highest for TN sponges. The high sorption capacity and remarkable reusability, with only a 4–6% drop in the sorption capacity after five sorption–desorption cycles, recommend these composite cryogels in the removal of two of the most dangerous pollutants represented by Cr2O72− and H2PO4−.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sustainable Multi-Network Cationic Cryogels for High-Efficiency Removal of Hazardous Oxyanions from Aqueous Solutions

Drăgan¹,

Humelnicu

Dinu³

2023

Polymers

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“…The removal and monitoring of heavy metal ions (HMIs) from/in aqueous environments are continuously in demand because of their high persistence in ecosystems, ability to accumulate in living organisms, and high toxicity [ 1 , 2 ]. In the past few years, numerous attempts have been reported to minimize the harmful impact of HMIs [ 3 , 4 , 5 , 6 , 7 , 8 ]. In this regard, various water treatment technologies, including liquid–liquid extraction, solid–liquid extraction (or solid-phase extraction, SPE) [ 3 , 4 , 5 , 6 , 8 ], coagulation/flocculation [ 3 , 4 , 5 , 9 ], chemical precipitation [ 3 , 4 , 5 ], oxidation [ 3 , 4 , 5 ], bioremediation [ 3 , 4 , 5 , 10 ], electrochemical treatment [ 3 , 4 , 5 ], and membrane filtration technologies [ 3 , 4 , 5 , 11 ] have received increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Ion-Imprinted Polymeric Materials for Selective Adsorption of Heavy Metal Ions from Aqueous Solution

Lazăr¹,

Ghiorghiță²,

Drăgan³

et al. 2023

Molecules

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The introduction of selective recognition sites toward certain heavy metal ions (HMIs) is a great challenge, which has a major role when the separation of species with similar physicochemical features is considered. In this context, ion-imprinted polymers (IIPs) developed based on the principle of molecular imprinting methodology, have emerged as an innovative solution. Recent advances in IIPs have shown that they exhibit higher selectivity coefficients than non-imprinted ones, which could support a large range of environmental applications starting from extraction and monitoring of HMIs to their detection and quantification. This review will emphasize the application of IIPs for selective removal of transition metal ions (including HMIs, precious metal ions, radionuclides, and rare earth metal ions) from aqueous solution by critically analyzing the most relevant literature studies from the last decade. In the first part of this review, the chemical components of IIPs, the main ion-imprinting technologies as well as the characterization methods used to evaluate the binding properties are briefly presented. In the second part, synthesis parameters, adsorption performance, and a descriptive analysis of solid phase extraction of heavy metal ions by various IIPs are provided.

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“…Given the large volumes of wastewater and the low concentration of TM in them, the methods of their treatment should be effective, affordable and environmentally safe. Sorption methods meet these requirements to the greatest extent [ 4 , 5 , 6 , 7 , 8 ]. Due to their efficiency, cost-effectiveness and environmental safety, sorbents have become widely used technologically.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Polymer Composite Based on a Modified Aminohumic Acid Tuned to a Sorbed Copper Ion

et al. 2023

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A composite based on amino-containing humic acid with the immobilization of multi-walled carbon nanotubes preliminarily tuned to a copper ion has been obtained. The synthesis of a composite pre-tuned for sorption by the local arrangement of macromolecular regions was obtained by introducing multi-walled carbon nanotubes and a molecular template into the composition of humic acid, followed by copolycondensation with acrylic acid amide and formaldehyde. The template was removed from the polymer network by acid hydrolysis. As a result of this tuning, the macromolecules of the composite “remember” conformations that are favorable for sorption, i.e., adsorption centers are formed in the polymer network of the composite, capable of repeated, highly specific interaction with the template and the highly selective extraction of target molecules from the solution. The reaction was controlled by the added amine and by the content of oxygen-containing groups. The structure and composition of the resulting composite were proven by physicochemical methods. A study of the sorption properties of the composite showed that after acid hydrolysis, the capacity increased sharply compared to a similar composite without tuning and a composite before hydrolysis. The resulting composite can be used as a selective sorbent in the process of wastewater treatment.

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Polysaccharide-Based Composite Hydrogels as Sustainable Materials for Removal of Pollutants from Wastewater

Cited by 24 publications

References 189 publications

Sustainable Multi-Network Cationic Cryogels for High-Efficiency Removal of Hazardous Oxyanions from Aqueous Solutions

Sustainable Multi-Network Cationic Cryogels for High-Efficiency Removal of Hazardous Oxyanions from Aqueous Solutions

Ion-Imprinted Polymeric Materials for Selective Adsorption of Heavy Metal Ions from Aqueous Solution

Synthesis of a Polymer Composite Based on a Modified Aminohumic Acid Tuned to a Sorbed Copper Ion

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