Optimization of preparation parameters for environmentally friendly attapulgite functionalized by chitosan and its adsorption properties for Cd2+

Jiang, Ziyang; An, Yu; Yu, Haiying; Huang, Zhenxing; Zou, Lu‐Yi

doi:10.1007/s11356-021-13788-8

Cited by 15 publications

(11 citation statements)

References 56 publications

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“…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. 1 …”

Section: Resultsmentioning

confidence: 99%

“… 51 In the second stage, Cd(II) diffused into the activated carbon through pores on the surface, and the adsorption rate was slow. In the third stage, Cd(II) adsorption by activated carbon nearly reached equilibrium; 1 therefore, during Cd(II) adsorption by PAAC and M-PAAC, the rate-controlling steps included external mass transfer and intraparticle diffusion.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

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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“…[54][55][56][57][58] In addition, ATP has a large specific surface area and strong adsorption capacity and can absorb growth factors and nutrients in the surrounding tissues, which is beneficial for promoting the regeneration of defective tissues. 33,[59][60][61] The physical and chemical properties and structural characteristics of ATP make it a potential material for bone tissue repair. 33 Our previous experiments confirmed that nanoattapulgite has good biocompatibility and promotes bone formation.…”

Section: Discussionmentioning

confidence: 99%

Polycaprolactone/Gelatin/Hydroxyapatite Electrospun Nanomembrane Materials Incorporated with Different Proportions of Attapulgite Synergistically Promote Bone Formation

Li¹,

Wu²,

Ma³

et al. 2022

IJN

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Purpose To enhance the osteoinductive effect of Hydroxyapatite (HA) in bone tissue engineering, this study manufactured polycaprolactone (PCL)/gelatin (GEL)/HA nanofibrous scaffolds incorporated with different ratios of attapulgite (ATP): HA (0:3, 0:0, 1:1, 2:1 and 3:0) by high-voltage electrospinning. The synergistic effect exerted by ATP and HA on bone formation was explored both in vivo and in vitro. Methods and Results First, we determined the group composition and crystal structure of the nanosheets by Fourier transform infrared (FTIR) and X-ray diffraction (XRD) analyses. Then, the physical properties of the scaffolds, including the modulus of elasticity, porosity and water absorption were evaluated. Moreover, the surface microstructure of the nanofibrous scaffolds was captured by Scanning electron microscopy (SEM) and Transmission Electron Microscope (TEM). The biocompatibility of the fabricated scaffolds represented by cell counting kit 8 (CCK-8) and phalloidin staining was also assessed. Next, in vitro osteogenesis was evaluated. Real-time PCR, alkaline phosphatase (ALP) staining and Alizarin red S (ARS) staining results showed that the materials incorporated with HA and ATP at a ratio of 2:1 synergistically promoted more osteoblastic differentiation and extracellular mineralization than scaffolds doped with HA and ATP alone. Last, in vivo, Hematoxylin-Eosin staining (HE staining) and Masson staining showed that groups treated with HA and ATP acquired optimal patterns of bone regeneration. Conclusion This study clarified for the first time that the combination of HA and ATP orchestrated biomaterial-induced osseointegration, and the synergistic effect was more significant when the ratio of ATP/HA was 2:1. This conclusion also provides new ideas and a scientific basis for the development of functionalized nanomaterials in bone tissue engineering.

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“…Various non-degradable heavy metal ions (HMIs) have received increasing attention on account of their serious threat to the ecosystems and human health by water pollution and food chain accumulation (Haroon et al 2020, Liu et al 2012, Nguyen et al 2021, Oliveira et al 2021, Zhao et al 2021. The contamination of cadmium (Cd) and nickel (Ni) have always been a matter of great concern to mankind in many areas (He et al 2021, Hezarjaribi et al 2020, Teng et al 2021. From the current data, the global concentrations of Cd and Ni in rivers and lakes have reached approximately 25.33 and 80.99 μg/L from 2010 to 2017, respectively (Zhou et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Isotherm, Kinetics, and Adsorption Mechanism Studies of DTPA-Modified Banana/Pomegranate Peels as Efficient Adsorbents for Removing Cd(II) and Ni(II) from Aqueous Solution

Wang

Lin

et al. 2021

Preprint

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Two novel absorbents were synthesized for the first time by banana and pomegranate peels using diethylenetriaminepentaacetic acid (DTPA) modification to eliminate Cd(II) and Ni(II) of sewage. The DTPA-modified peels performed significantly higher adsorption capacity than unmodified materials. Adsorption isotherm and kinetics models were simulated to determine their removal efficiency and potential for recovery of these two heavy metals. As the results, the adsorption reached equilibrium within 5 minutes and was well described by the pseudo-second order model and Langmuir isotherm. The surface morphology analysis of the synthetic materials by Scanning Electron Microscopy-Energy Dispersive X-ray spectroscopy, Fourier Transform Infrared spectroscopy and X-ray Photoelectron Spectroscopy, implied that ion exchange, complexation and physical adsorption may together contribute to Cd(II) and Ni(II) loading on DTPA-modified peels. This study demonstrates the feasibility of waste peels as cost-efficient bio-absorbents to remove Cd(II) and Ni(II) in sewage systems, and discovers potential adsorption mechanism of efficiency improvements after DTPA modification.

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Optimization of preparation parameters for environmentally friendly attapulgite functionalized by chitosan and its adsorption properties for Cd2+

Cited by 15 publications

References 56 publications

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

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

Polycaprolactone/Gelatin/Hydroxyapatite Electrospun Nanomembrane Materials Incorporated with Different Proportions of Attapulgite Synergistically Promote Bone Formation

Isotherm, Kinetics, and Adsorption Mechanism Studies of DTPA-Modified Banana/Pomegranate Peels as Efficient Adsorbents for Removing Cd(II) and Ni(II) from Aqueous Solution

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