Preparation of green chelating fibers and adsorption properties for Cd(II) in aqueous solution

Meng, Jian; Cui, Jianlan; Yu, Jing; Huang, Wei; Wang, Peng; Wang, Kui; Liu, Mingqiao; Song, Changyuan; Chen, Peng

doi:10.1007/s10853-017-1653-x

Cited by 20 publications

(7 citation statements)

References 32 publications

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“…Metal transfer is controlled by the resistance to intraparticle diffusion because the polymer is poorly porous; this makes necessary modifying its structure by manufacturing hydrogels with expanded structure [30,31]. An alternate solution for improving mass transfer consists of depositing thin layers of biopolymer at the surface of inactive supports [32][33][34]. The synthesis of composite magnetic/chitosan supports of micron-or nanometer size is an attractive alternative abundantly documented for preparing highly efficient and fast sorbents [35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Efficient removal of uranium, cadmium and mercury from aqueous solutions using grafted hydrazide-micro-magnetite chitosan derivative

et al. 2019

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Magnetic chitosan microparticles are functionalized by grafting a new hydra-zide derivative to produce HAHZ-MG-CH, which is applied to the sorption of metal cations. The functionalization (appearance of new groups) and synthesis mechanisms are confirmed using elemental analyses, FTIR and XPS spectrom-etry, TGA and EDX analysis, SEM observation and titration. HAHZ-MG-CH bears high nitrogen content (& 10.9 mmol N g-1). Maximum sorption capacities at pH 5 reach up to 1.55 mmol U g-1 , 1.82 mmol Hg g-1 and 2.67 mmol Cd g-1. Sorption isotherms are preferentially fitted by the Langmuir model. In acidic solutions, the sorbent has a marked preference for Hg(II) over U(VI) and Cd(II), while at mild pH uranyl species are preferentially bound. The sorbent has a lower affinity for Cd(II) in multicomponent solutions. Sorption occurs within 60 min of contact. The pseudo-first-order rate equation fits well kinetic profiles. HCl solutions (0.5 M) successfully desorb all the metal ions (yield exceeds 97% at the first cycle). The sorbent can be recycled for 5 cycles of sorption and desorption: the loss in efficiencies does not exceed 8%. The sorbent removes Hg(II), Cd(II) and Pb(II) from local contaminated groundwater at levels compatible with irrigation and livestock uses but not enough to reach the levels for drinking water regulations.

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Section: Introductionmentioning

confidence: 99%

Efficient removal of uranium, cadmium and mercury from aqueous solutions using grafted hydrazide-micro-magnetite chitosan derivative

et al. 2019

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“…For M-PAAC at an ion strength of 0 mM, when the initial concentration of Cd(II) increased from 20 to 60 mg/L, the Cd(II) adsorption amount increased significantly from 23.16 to 48.70 mg/g, while the Cd(II) adsorption amount increased slowly from 48.70 to 52.52 mg/g after the initial Cd(II) concentration exceeded 60 mg/L. This phenomenon was caused by the fixed number of vacant sites and active groups on the surface of a fixed amount of activated carbon . At a low initial Cd(II) concentration (20–60 mg/L), the small transfer resistance between the liquid and solid phases was conducive to Cd(II) adsorption, resulting in significantly increased Cd(II) adsorption.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon was caused by the fixed number of vacant sites and active groups on the surface of a fixed amount of activated carbon. 37 At a low initial Cd(II) concentration (20−60 mg/L), the small transfer resistance between the liquid and solid phases was conducive to Cd(II) adsorption, resulting in significantly increased Cd(II) adsorption. When the initial Cd(II) concentration increased (≥60 mg/L), the transfer resistance between the solid and liquid phases also increased, which caused the Cd(II) adsorption amount to increase slowly.…”

Section: Resultsmentioning

confidence: 99%

Contributions of Various Cd(II) Adsorption Mechanisms by Phragmites australis-Activated Carbon Modified with Mannitol

et al. 2022

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Due to its high toxicity, persistence, and bioaccumulation in the food chain, controlling cadmium (Cd) pollution in wastewater is urgent. Activated carbon is a popular material for removing Cd. To improve the Cd(II) adsorption efficiency by increasing the number of oxygen-containing functional groups, Phragmites australis -activated carbon (PAAC) was modified with mannitol at a low temperature (150 °C). The textural and chemical characteristics of PAAC and modified PAAC (M-PAAC) were analyzed by surface area analysis, elemental analysis, Boehm’s titration, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Batch adsorption experiments were conducted to investigate the influence of Cd(II) concentration, contact time, ionic strength, and pH on Cd(II) adsorption. The main adsorption mechanisms of Cd(II) on activated carbon were quantitatively calculated. The results showed that mannitol modification slightly decreased the S BET (5.30% of PAAC) and increased the content of carboxyl, lactone, and phenolic groups (total increase of 43.96% with PAAC), which enhanced the adsorption capacity of PAAC by 58.59%. The adsorption isotherms of PAAC and M-PAAC were described well using the Temkin model, while the intraparticle diffusion model fitted the Cd(II) adsorption kinetics best. Precipitation with minerals was a crucial factor for Cd(II) adsorption on activated carbon (50.40% for PAAC and 40.41% for M-PAAC). Meanwhile, the Cd(II) adsorption by M-PAAC was also dominated by complexation with oxygen-containing functional groups (33.60%). This research provides a method for recovering wetland plant biomass to prepare activated carbon and efficiently treat Cd-containing wastewater.

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“…The average free energy E calculated from D‐R model can be used to examine the sorption properties. E values of less than 8 kJ/mol suggest that the adsorption is a physical adsorption process, whereas E values of more than 8 kJ/mol means the adsorption is a chemical adsorption (Meng et al., 2018; Zhou et al., 2014). In this study, the calculated E values for patulin adsorption at different temperature were higher than 8 kJ/mol, reconfirming that the adsorption of patulin on TETA‐WICF/MCR was mainly chemisorptions process.…”

Section: Resultsmentioning

confidence: 99%

“…D‐R isotherm does not assume that the adsorption occurs at a homogeneous surface with constant sorption potential energy, but the model can be applicable to estimate whether the adsorption is chemisorption or physisorption (Meng et al., 2018). The D‐R isotherm equation is described as:

\ln q_{normale} = \ln q_{normalD} - K_{normalD} ε^{2} .

…”

Section: Methodsmentioning

confidence: 99%

Synthesis of triethylene tetramine–modified water‐insoluble corn flour caged in magnetic chitosan resin and its adsorption application for removal of patulin from apple juice

Guo

Han

Guo

et al. 2020

Journal of Food Science

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In this study, triethylene tetramine-modified water-insoluble corn flour caged in magnetic chitosan resin (TETA-WICF/MCR) was firstly prepared, which indicates novel aspects for immobilization and chemically modification of mycotoxin adsorbents. The TETA-WICF/MCR was characterized using zoom stereo microscope, scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometer (XRD), and magnetic separation performance analysis. Experimental results confirmed successful layer by layer modification of chitosan, biosorbent water-insoluble corn flour (WICF), TETA onto the surface of magnetic beads. The mean diameter of the TETA-WICF/MCR was 2.63 mm with good magnetic-responsive ability. Subsequently, the adsorption performance of the TETA-WICF/MCR obtained toward patulin was assessed in batch adsorption system and the results demonstrated that the adsorption process was strongly depended on adsorbent dosage, contact time, temperature, and initial patulin concentration. The results of SEM images and FTIR analysis showed obvious changes in the porous structure of TETA-WICF/MCR after adsorbing patulin, and -NH 2 and -OH groups were predominantly involved in the adsorption of patulin. Furthermore, the adsorption kinetics followed the mechanism of pseudo-second-order model, and equilibrium data were well fitted in the Freundlich isotherm model. It was also found that the TETA-WICF/MCR had good reusability without any adverse changes in apple juice.

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Preparation of green chelating fibers and adsorption properties for Cd(II) in aqueous solution

Cited by 20 publications

References 32 publications

Efficient removal of uranium, cadmium and mercury from aqueous solutions using grafted hydrazide-micro-magnetite chitosan derivative

Efficient removal of uranium, cadmium and mercury from aqueous solutions using grafted hydrazide-micro-magnetite chitosan derivative

Contributions of Various Cd(II) Adsorption Mechanisms by Phragmites australis-Activated Carbon Modified with Mannitol

Synthesis of triethylene tetramine–modified water‐insoluble corn flour caged in magnetic chitosan resin and its adsorption application for removal of patulin from apple juice

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