An ion release controlled Cr(VI) treatment agent: Nano zero-valent iron/carbon/alginate composite gel

Wen, Ruiting; Tu, Biyang; Guo, Xiaohong; Xiao-qin, Hao; Wu, Xia; Tao, Haisheng

doi:10.1016/j.ijbiomac.2019.12.168

Cited by 36 publications

(17 citation statements)

References 54 publications

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“…Kinetic fitting relevant parameters of two dyes adsorption on Fe in Table 3, indicating the occurrence of chemical adsorption and hydrogen bonding between the adsorbent and dye molecules [62].…”

Section: Tablementioning

confidence: 99%

Preparation of Novel Magnetic Sodium Alginate-Ferric(III) Gel Beads and Their Super-Efficient Removal of Direct Dyes from Water

2020

J Polym Environ

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Novel magnetic sodium alginate-based biopolymer Fe 3 O 4 @SA-Fe was successfully prepared by the cross-linking reaction of sodium alginate (SA) and Fe(III) ions and adding magnetic ferric oxide (Fe 3 O 4 ), and characterized by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), Fourier Transform-Infrared (FTIR), X-ray Photoelectron Spectroscopy (XPS) and Vibrating Sample Magnetometer (VSM), respectively. The effects of preparation and adsorption conditions on the adsorbent were investigated by adsorbing Congo red (CR) and Direct red 23 (DR 23) dyes. The results showed that the synthesized Fe 3 O 4 @SA-Fe polymer gel beads exhibited super-high adsorption property and good stability when the mass concentrations of SA, Fe(III) ions and Fe 3 O 4 are 16, 12.5 and 7 g/L at room temperature respectively. The adsorption rates of two dyes by Fe 3 O 4 @SA-Fe were very fast at 298 K, and the time required to reach the equilibrium was very short, which was 30 min for CR and 60 min for DR 23. Moreover, the dye removal efficiencies were over 99.4% and 95.2% in a wide pH range of 2.0 ~ 9.0 for CR and 2.0 ~ 10.0 for DR 23, respectively. The adsorption process could be accurately described by the pseudo-second-order rate model, which were mostly controlled by intra-particle diffusion. The fitting results of isothermic data by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models revealed that the equilibrium data completely obeyed the Langmuir model and the obtained maximum adsorption capacities of CR and DR 23 were 3333 and 1429 mg/g at 298 K, respectively. FTIR, UV-Vis and XPS analysis indicated that the electrostatic adsorption, hydrogen bonding and ligand exchange promoted the interaction between dye molecules and Fe 3 O 4 @SA-Fe. A green magnetic biosorbent Fe 3 O 4 @SA-Fe gel beads with simple preparation method and high-cost performance can be used for super-efficient purification of high-concentration dye effluent and quickly separated from the aqueous phase and recovered, which would have a good application prospect.

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Section: Tablementioning

confidence: 99%

Preparation of Novel Magnetic Sodium Alginate-Ferric(III) Gel Beads and Their Super-Efficient Removal of Direct Dyes from Water

2020

J Polym Environ

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“…It can be seen that four kinds of (M)CAs have similar functional group structures, and the wide peak at 3452 cm −1 belongs to the stretching vibration of hydroxyl (-OH). 17 The small peak at Environmental Science: Water Research & Technology Paper 2817 cm −1 indicates the -CH 2 structure of MCA. 23 The peaks at 1591 cm −1 and 769 cm −1 mean that MCA contains the benzene ring structure, 24 which mainly comes from resorcinol.…”

Section: Characterization Of the Adsorbentmentioning

confidence: 99%

“…Carbon aerogel, a novel 3D porous network carbon structure, can not only adsorb organic pollutants efficiently because of its strong hydrophobicity but also attract inorganic metal ions through strong coordination between O and N elements and M n + . 15 CA has been successfully used to adsorb Cu 2+ , 16 Cr( vi ), 17 uranium( vi ) 18 and Cl − . 19 However, CA alone requires an additional separation step such as centrifugation or filtration to remove it from the solution.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and co-adsorption mechanisms of p-nitrophenol and Pb(ii) on magnetic carbon aerogel in water

Liu

Chen

Sheng

et al. 2022

Environ. Sci.: Water Res. Technol.

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“…In case of exceeding that limit (0.05 mg L −1 ), chromium ions must be removed from wastewater. Recently, researchers have focused on developing eco-friendly and low-cost adsorbents for removing Cr(VI) [31][32][33], in which the efficient uses of the green synthesized nanoparticles in removal of heavy elements and Cr ions [34,35]. In this regard, chitosan modification by various chemical (by grafting of new functional groups) and physical methods (fabrication as beads or gels) has played an important role as an effective technique to remove inorganic and organic contaminant of aqueous intermediates [36,37].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Functionalized Chitosan Nanoparticles with Pyrimidine Derivative for Enhancing Ion Sorption and Application for Removal of Contaminants

et al. 2022

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Modified chitosan has been widely used for heavy metals removal during the last few decades. In this research, the study was focused on the effect of modified chitosan particles after grafting with heterocyclic constituent for enhancing the sorption of Cr(VI) ions. Chitosan was functionalized by 2-thioxodihydropyrimidine-4,6(1H,5H)-dione, in which the synthesized composite considered as a nanoscale size with average 5–7 nm. This explains the fast kinetics of sorption with large surface area. The prepared sorbent was characterized by Fourier-transform infrared (FTIR), elemental analysis (EA), Brunauer–Emmett–Teller (BET surface area) theory, thermogravimetric analysis (TGA), mass spectroscopy, and scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX) analyses. The experimental part of this work involved the application of the synthesized sorbent for the removal of Cr(VI) ions from highly contaminated tannery effluents that are characterized by a high concentration toward chromate ions with other associated toxic elements, i.e., Pb(II) and Cd (II) ions, which underscore the importance of this treatment. Under the selected conditions (K2Cr2O7 salt, Co: 100 mg L−1 and pH: 4), the sorption diagram shows high Cr(VI) sorption and fast uptake kinetics. The sorption was enhanced by functionalization to 5.7 mmol Cr g−1 as well as fast uptake kinetics; 30 min is sufficient for total sorption compared with 1.97 mmol Cr g−1 and 60 min for the non-grafted sorbent. The Langmuir and Sips equations were fitted for the sorption isotherms, while the pseudo-first order rate equation (PFORE) was fitted for the uptake kinetics.

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An ion release controlled Cr(VI) treatment agent: Nano zero-valent iron/carbon/alginate composite gel

Cited by 36 publications

References 54 publications

Preparation of Novel Magnetic Sodium Alginate-Ferric(III) Gel Beads and Their Super-Efficient Removal of Direct Dyes from Water

Preparation of Novel Magnetic Sodium Alginate-Ferric(III) Gel Beads and Their Super-Efficient Removal of Direct Dyes from Water

Adsorption and co-adsorption mechanisms of p-nitrophenol and Pb(ii) on magnetic carbon aerogel in water

Synthesis and Characterization of Functionalized Chitosan Nanoparticles with Pyrimidine Derivative for Enhancing Ion Sorption and Application for Removal of Contaminants

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