Composite of chitosan and bentonite cladding Fe–Al bimetal: Effective removal of nitrate and by-products from wastewater

Cheng, Houming; Zhu, Qi; Wang, Aiwen; Weng, Mingmei; Xing, Zipeng

doi:10.1016/j.envres.2020.109336

Cited by 27 publications

(10 citation statements)

References 52 publications

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“…A pillared process was needed to improve the interaction of bentonite with chitosan [30]. The preparation of Fe/Al pillared bentonite was carried out following the treatment of bentonite by hydroxyl-Fe and hydroxyl-Al.…”

Section: Preparation Of Chitosan/bentonite Composites (Csbt)mentioning

confidence: 99%

“…The results showed that the chitosan/bentonite composite had excellent adsorption performance, and the heavy metals could not only electrostatically complex with carboxyl and hydroxyl groups but also chelate with amino, azo, and pyridine groups. Cheng et al [30] used chitosan to load iron-aluminium bimetallic particles onto bentonite and found that the iron-aluminium bimetal was surrounded by chitosan and bentonite, which can effectively solve the problem of secondary pollution of nanometal particles. Due to the excellent synergy between chitosan, bentonite, and bimetals, the removal effect of composite materials on inorganic salts is effectively improved compared with that of a single material.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of Chitosan/Bentonite Composites for Cr (VI) Removal from Aqueous Solutions

Jia

Liu

Sun

2021

Adsorption Science & Technology

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Chitosan/bentonite composites (CSBT) prepared by physical gelation were tested for the adsorption of Cr (VI) from aqueous solutions in this work. The composites were prepared at a mass ratio from 2 : 1 to 1 : 2, and a composite of 1 : 1 was found to be most suitable for efficient Cr (VI) removal. The influencing parameters, including temperature, adsorbent dose, and pH, were statistically optimized using response surface methodology (RSM) for the removal of Cr (VI). The pH was found to be the limiting factor during the adsorption process, and under the optimal conditions, namely, adsorbent dose of 400 mg/L, pH = 3 , and temperature of 298 K, 87.61% Cr (VI) would be removed expectantly. The mechanism of Cr (VI) removal by CSBT was discussed, and the protonation of amino groups on chitosan followed by the combination of -NH3+ and anionic hexavalent chromium was the primary driving force. In addition, the removal of Cr (VI) onto CSBT was monolayer adsorption with a maximum adsorption capacity of 133.85 mg/g by the Langmuir isotherm. CSBT follows a pseudosecond-order kinetic model, and within 1.5 h, adsorption was observed to reach equilibrium. The calculated thermodynamic functions clarified that the adsorption process was exothermic and spontaneous below 312.60 K. CSBT could be regenerated after desorption by 0.5 mol/L NaOH solutions and exhibited superior reusability after six cycles. This study demonstrated composites of chitosan/bentonite as eco-friendly bioadsorbents for the removal of Cr (VI) from aqueous environments.

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Section: Preparation Of Chitosan/bentonite Composites (Csbt)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Chitosan/Bentonite Composites for Cr (VI) Removal from Aqueous Solutions

Jia

Liu

Sun

2021

Adsorption Science & Technology

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“…The presence of Mg 2+ and Si 4+ in BT resulted in complexation with NO 3 − via electrostatic attraction. 24 In addition, the respective FTIR bands of −OH groups of metal cross-linked AlgBT composite beads were broad with altered signals in FTIR spectra of NO 3 − -adsorbed metal cross-linked AlgBT composite beads, which shows the occurrence of electrostatic attraction of −OH groups of Alg on NO 3…”

Section: Nitrate Adsorptionmentioning

confidence: 94%

“…The BT interlayer possesses easily exchangeable OH − ions. 10 BT clay is used in drilling mud, in binders, in groundwater barriers, in medical purposes, in adsorbents, etc. Moreover, BT clay has a good specific surface area and contains active metal ions along with exchangeable OH − ions, making it an excellent material for NO 3 − remediation.…”

Section: Introductionmentioning

confidence: 99%

Complex Fabrication of Zr⁴⁺, La³⁺, and Ce³⁺ Coordinated Alginate-Assisted Bentonite-Based Hybrid Beads for Nitrate Removal

et al. 2021

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Worldwide, environmental researchers have been widely focused on the technological development for the removal of numerous aquatic toxic pollutants. The development of Zr4+, La3+, and Ce3+ (Lewis metal ions)-linked alginate (Alg)/bentonite (BT) (AlgBT) composites, that is, Zr@AlgBT, La@AlgBT, and Ce@AlgBT inPl the bead form, was utilized toward nitrate (NO3 –) removal. The metal coordinated composite hybrid beads have an enriched NO3 – sorption capacity (SC) among the utilized materials. Instrumentation processes such as thermogravimetric analysis (TGA), Brunauer–Emmett–Teller (BET) analysis, energy-dispersive X-ray analysis (EDAX), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) for the beads were performed. The effect of the parameters responsible for adsorption was optimized under the batch mode. Adsorption data was fitted with the significant parameters of isotherms, chemical kinetics, and thermodynamics. The field applicability test of the proposed beads was also explored.

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“…It was also found that the bimetallic complex chitosan-Fe/Al is more effective for water puri cation from nitrates (NO 2 − , NO 3 − , NH 4 − ) at low temperatures than at usual [13][14][15]. pH is a key factor affecting the e ciency of nitrate puri cation.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Chitosanstabilized Nanoparticles Ag/Cu, Ag/Co with Fungicidal Properties

Вохидова

Рашидова

2021

Preprint

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Synthesized chitosan stabilized bimetallic nanoparticles Ag/Cu and Ag/Co. It was found that the size and shape of bimetallic nanoparticles can be controlled by varying the concentration of the reducing agent – NaBH4 and the molar ratios of metal ions.Established that an increase in the concentration of the reducing agent, as well as metal ions, promote the formation of fibrillar nanoparticles. It was found that solutions of the synthesized samples effectively suppress the growth and development of the phytopathogen - Fusarium oxysporium forming a sterile zone from 13.3 to 36 mm.

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Composite of chitosan and bentonite cladding Fe–Al bimetal: Effective removal of nitrate and by-products from wastewater

Cited by 27 publications

References 52 publications

Preparation and Characterization of Chitosan/Bentonite Composites for Cr (VI) Removal from Aqueous Solutions

Preparation and Characterization of Chitosan/Bentonite Composites for Cr (VI) Removal from Aqueous Solutions

Complex Fabrication of Zr⁴⁺, La³⁺, and Ce³⁺ Coordinated Alginate-Assisted Bentonite-Based Hybrid Beads for Nitrate Removal

Bimetallic Chitosanstabilized Nanoparticles Ag/Cu, Ag/Co with Fungicidal Properties

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Composite of chitosan and bentonite cladding Fe–Al bimetal: Effective removal of nitrate and by-products from wastewater

Cited by 27 publications

References 52 publications

Preparation and Characterization of Chitosan/Bentonite Composites for Cr (VI) Removal from Aqueous Solutions

Preparation and Characterization of Chitosan/Bentonite Composites for Cr (VI) Removal from Aqueous Solutions

Complex Fabrication of Zr4+, La3+, and Ce3+ Coordinated Alginate-Assisted Bentonite-Based Hybrid Beads for Nitrate Removal

Bimetallic Chitosanstabilized Nanoparticles Ag/Cu, Ag/Co with Fungicidal Properties

Contact Info

Product

Resources

About

Complex Fabrication of Zr⁴⁺, La³⁺, and Ce³⁺ Coordinated Alginate-Assisted Bentonite-Based Hybrid Beads for Nitrate Removal