Highly Efficient Adsorption of Heavy Metals and Cationic Dyes by Smart Functionalized Sodium Alginate Hydrogels

Shi, Tianzhu; Xie, Zhenzhen; Mo, Xinliang; Feng, Yi; Tao, Peng; Song, Dandan

doi:10.3390/gels8060343

Cited by 23 publications

(9 citation statements)

References 65 publications

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“…Considering the contamination of dyes and the growth of bacteria in the wastewater, a material technology can deal with adsorbed dyes and sterilize is required. Some approaches have been used to purify the e uent, such as oxidation [6], electrochemical treatment [7], photocatalysis [8], occulation-coagulation [9], ion exchange [10], aerobic or anaerobic microbial treatment [11] and adsorption [12] etc. In the above methods, the oxidation method may cause secondary pollution since the used of the additional reagents.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Porous biomass gel beads SA/CS/GO construction and bifunction tuning on adsorption and antibacterial properties

Wang

Feng

2022

Preprint

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The organic dye molecules and pathogenic microorganisms exist widely in printing and dyeing wastewater which will bring severe harm to human beings and the water environment if they are not properly treated. A novel SA/CS/GO gel beads with both adsorption and antibacterial functions are synthesized in the special ways. NaHCO3 is selected as porogen to control the density of gel beads formed by the cross-linking of Ca2+. Ag+ is fixed on outside the beads to optimize the inactivation rate of typical strains. The morphology and composite of the beads are characterized through SEM and FT-IR spectrometer. The adsorption properties of the beads accord with the Langmuir isotherm and quasi-secondary model, that means, the adsorption is monolayer behavior and the reaction rate is controlled through the chemical reaction process. The theoretical adsorption liminal value of MB on the beads can reach 847.46 mg/g. In the range of pH value at 3–11, it also has good adsorption ability. After five rounds of adsorption-desorption experiments, the gel beads still remain favorable performance. At the same time, the sterilization rate of the beads is almost 100% for the selected typical strains, even after several adsorption-desorption cycles, it still has a good bactericidal function. So, this kind of new gel beads is easy to recycle, reusable, and has broad application foreground in the field of water purification, sterilization, and adsorption.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Porous biomass gel beads SA/CS/GO construction and bifunction tuning on adsorption and antibacterial properties

Wang

Feng

2022

Preprint

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“…Currently, several techniques are used to obtain cationic coatings on biomaterials, such as layer-by-layer electrostatic interactions, 19 physical adsorption, 20 and covalent bonding. 21 Among these proposed techniques, covalent bonding between silane and hydroxyl groups is an outstanding method because it produces stable immobilization of positive charges on implant surfaces, 22 prolonging the antibacterial properties.…”

Section: Introductionmentioning

confidence: 99%

Boosting Titanium Surfaces with Positive Charges: Newly Developed Cationic Coating Combines Anticorrosive and Bactericidal Properties for Implant Application

Silva

Costa

Nagay

et al. 2023

ACS Biomater. Sci. Eng.

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Along with poor implant−bone integration, peri-implant diseases are the major causes of implant failure. Although such diseases are primarily triggered by biofilm accumulation, a complex inflammatory process in response to corrosive-related metallic ions/debris has also been recognized as a risk factor. In this regard, by boosting the titanium (Ti) surface with silane-based positive charges, cationic coatings have gained increasing attention due to their ability to kill pathogens and may be favorable for corrosion resistance. Nevertheless, the development of a cationic coating that combines such properties in addition to having a favorable topography for implant osseointegration is lacking. Because introducing hydroxyl (−OH) groups to Ti is essential to increase chemical bonds with silane, Ti pretreatment is of utmost importance to achieve such polarization. In this study, plasma electrolytic oxidation (PEO) was investigated as a new route to pretreat Ti with OH groups while providing favorable properties for implant application compared with traditional hydrothermal treatment (HT). To produce bactericidal and corrosion-resistant cationic coatings, after pretreatment with PEO or HT (Step 1), surface silanization was subsequently performed via immersion-based functionalization with 3-aminopropyltriethoxysilane (APTES) (Step 2). In the end, five groups were assessed: untreated Ti (Ti), HT, PEO, HT+APTES, and PEO+APTES. PEO created a porous surface with increased roughness and better mechanical and tribological properties compared with HT and Ti. The introduction of −OH groups by HT and PEO was confirmed by Fourier transform infrared spectroscopy and the increase in wettability producing superhydrophilic surfaces. After silanization, the surfaces were polarized to hydrophobic ones, and an increase in the amine functional group was observed by X-ray photoelectron spectroscopy, demonstrating a considerable amount of positive ions. Such protonation may explain the enhanced corrosion resistance and dead bacteria (Streptococcus aureus and Escherichia coli) found for PEO+APTES. All groups presented noncytotoxic properties with similar blood plasma protein adsorption capacity vs the Ti control. Our findings provide new insights into developing next-generation cationic coatings by suggesting that a tailorable porous and oxide coating produced by PEO has promise in designing enhanced cationic surfaces targeting biomedical and dental implant applications.

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“…On the other hand, adsorption is recognized as an economically effective heavy metal removal process due to its simplicity and flexibility in both operation and design [1,10,14]. A variety of adsorbents, like biochar [15,16], MXenes [17,18], graphene oxide [19], carbon nanotubes [20], zeolites [21,22], spent mushroom substrate [23], and activated carbon [23,24], were reported on the removal of heavy metals from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Optimization and modelling of Pb (II) and Cu (II) adsorption onto red algae (Gracilaria changii)-based activated carbon by using response surface methodology

Isam

Baloo

Chabuk

et al. 2023

Biomass Conv. Bioref.

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Activated carbon obtained from red algae Gracilaria changii was used as an adsorbent to remove Pb (II) and Cu (II) from an aqueous solution. The raw red algae were first impregnated with phosphoric acid, followed by thermal activation. The Box–Behnken design was used to optimize the activation process. The optimum activation parameters were 84%, 650 °C, and 175 min for acid concentration, activation temperature, and activation time, respectively. The obtained activated carbon had a high surface area of 867 m2/g. The removal of Pb (II) and Cu (II) was evaluated using a batch adsorption study. The effect of solution pH on the removal of metal ions was investigated within the range of 2–7. The effect of three important adsorption parameters (initial metal ion concentration, adsorbent dosage, and contact time) was analyzed using central composite design. The optimum removal of Pb (II) and Cu (II) was 76% and 36%, respectively. The adsorption kinetics obeyed the pseudo-second-order model, while the adsorption isotherm obeyed the Langmuir model.

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Highly Efficient Adsorption of Heavy Metals and Cationic Dyes by Smart Functionalized Sodium Alginate Hydrogels

Cited by 23 publications

References 65 publications

WITHDRAWN: Porous biomass gel beads SA/CS/GO construction and bifunction tuning on adsorption and antibacterial properties

WITHDRAWN: Porous biomass gel beads SA/CS/GO construction and bifunction tuning on adsorption and antibacterial properties

Boosting Titanium Surfaces with Positive Charges: Newly Developed Cationic Coating Combines Anticorrosive and Bactericidal Properties for Implant Application

Optimization and modelling of Pb (II) and Cu (II) adsorption onto red algae (Gracilaria changii)-based activated carbon by using response surface methodology

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