Hollow polyethyleneimine/carboxymethyl cellulose beads with abundant and accessible sorption sites for ultra-efficient chromium (VI) and phosphate removal

Yang, Huiru; Li, Shanshan; Shan, Xiangcheng; Yang, Chen; An, Qingda; Zhai, Shangru; Xiao, Zuoyi

doi:10.1016/j.seppur.2021.119607

Cited by 54 publications

(17 citation statements)

References 69 publications

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“…On the contrary, low adsorption of Cr(VI) were revealed at pH > pHPZC (see Figure 2a) up to the alkaline medium due to competition between OHand Cr 2 O 7 2− which is the dominant form of Cr(VI) in the medium [39]. The results of this study corresponds with similar results reported over the literature for Hg(II) and Cr(VI) adsorption [1,6].…”

Section: Influence Of Phsupporting

confidence: 89%

“…The acidic and alkaline nature of the solution is a significant parameter influencing the form of Hg(II) and Cr(VI) contaminants in the solution and the surface charges of the adsorbent [1][2][3]6]. The influence of pH was investigated in the range 1 to 7 because Hg(II) is unstable in alkaline condition.…”

Section: Influence Of Phmentioning

confidence: 99%

“…On the other hand, the highest adsorption removal of 82.9% for Cr(VI) was obtained at pH 3, indicating increase in adsorption removal from pH 1 to 3 and decrease beyond pH 3. Generally, Cr(VI) exists in acid solution ( [6,39]. Typically, the isoelectric point (pHPZC) of MWCNTs-Ag 0 /PVAc was evaluated by titration method and obtained as 4.5 whereby the adsorbent was barely charged.…”

Section: Influence Of Phmentioning

confidence: 99%

“…The reduction in adsorption effectiveness of Hg(II) at low pH could be attributed to occupation of adsorptive sites of adsorbent by hydrogen ions (H + ) rather than Hg(II), that is competitive adsorption between protons and metal species [1,2]. Comparatively, the adsorption of Cr(VI) was facilitated and favored at low pH (pH > pHPZC) by electrostatic interaction between the negatively charged HCrO 4 − (anion) and the positively charged adsorbent [6,39]. Notably, at the pH > pHPZC, the electrostatic attraction existing between positively charged Hg(II) and negatively charged adsorbent occurred and enhanced the adsorption capacity [3,39].…”

Section: Influence Of Phmentioning

confidence: 99%

“…The accumulation of mercury in the human body causes severe damages to the skin, liver, kidney, thyroid, immune system and central nervous system [2]. Also, prolonged exposure to chromium are carcinogenic, mutagenic, causes diarrhea, asthma and severe damage to the brain, kidney and liver [4,6]. Therefore, it is a pressing task to remove mercury and chromium from wastewater to be in the recommended concentration of drinking water range from 0.002 to 0.006 mg/L and 0.06 to 0.09 mg/L [7].…”

Section: Introductionmentioning

confidence: 99%

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Incorporation of zero-valent silver and polyvinyl acetate on the surface matrix of carbon nanotubes for the adsorption of mercury and chromium from industrial wastewater

Egbosiuba¹

2022

Nig. J. Tech.

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Herein, zero-valent silver (Ag0) and polyvinyl acetate (PVAc) was ultrasonically incorporated into the surface matrix of MWCNTs to produce a multifunctional MWCNTs-Ag0/PVAc nanocomposite. The MWCNTs, MWCNTs-Ag0 and MWCNTs-Ag0/PVAc were characterized for the thermal stability, crystallographic structure and morphology using thermogravimetric analysis (TGA), X-ray diffraction (XRD) and high resolution scanning electron microscopy (HRSEM). Industrial wastewater containing Hg(II) and Cr(VI) ions were treated using the fabricated MWCNTs-Ag0/PVAc at different adsorption parameters such as pH, adsorbent mass, adsorption time and temperature. The characterization result obtained indicated successful incorporation of the Ag0 and PVAc to the surface matrix of MWCNTs-Ag0/PVAc. The materials were thermally stable and the crystalline peaks/patterns of the incorporated materials were evident on the MWCNTs-Ag0/PVAc. The adsorption study revealed maximum adsorption capacity of 249 mg/g and 237 mg/g for the Hg(II) and Cr(VI) by MWCNTs-Ag0/PVAc at the pH (6 for Hg(II) and 3 for Cr(VI)), adsorbent mass (40 mg), adsorption time (60 min) and temperature (30 °C). The experimental data effectively fitted the Langmuir isotherm and pseudo-second order kinetic, respectively. Finally, MWCNTs-Ag0/PVAc showed remarkable performance as a suitable adsorbent for heavy metals removal from industrial wastewater.

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Section: Influence Of Phsupporting

confidence: 89%

Section: Influence Of Phmentioning

confidence: 99%

Section: Influence Of Phmentioning

confidence: 99%

Section: Influence Of Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Incorporation of zero-valent silver and polyvinyl acetate on the surface matrix of carbon nanotubes for the adsorption of mercury and chromium from industrial wastewater

Egbosiuba¹

2022

Nig. J. Tech.

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Electrospun chitosan/polymethyl methacrylate nanofiber membranes integrated with polyethyleneimine for enhanced removal of chromium(VI) ions

Yu,

Xu,

Sun

et al. 2024

J of Applied Polymer Sci

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This study demonstrates the preparation of a unique chitosan (CS)/polymethyl methacrylate (PMMA)/polyethyleneimine (PEI) nanofiber (NF) membrane using PMMA as the composite skeleton through an electrospinning method. The chemical and mechanical properties, chromium (Cr) adsorption capabilities, and mass transfer mechanisms of the NF membrane were thoroughly investigated. The findings indicate that the CS/PMMA/PEI NF membranes, with an average diameter of approximately 856.2 nm, exhibits favorable hydrophilicity, effective Cr(VI) adsorption (first adsorption capacity of 226.5 mg g−1), and robust mechanical properties (tensile strength of 1.58 ± 0.092 Mpa), which is superior to most reported adsorbents. Moreover, the composite NF membranes exhibit a second adsorption capacity of 194.4 mg g−1 and a tensile strength of 0.739 ± 0.072 Mpa after the second adsorption, indicating a remarkable level of reusability and cycle stability. Additionally, x‐ray photoelectron spectroscopy, and structural tests reveal the presence of abundant amino (NH2) and hydroxyl (OH) groups in the CS/PMMA/PEI NF membranes, suggesting potential sites for complexation reactions and the reductions of Cr(VI) ions, thereby facilitating effective adsorption and removal of heavy metals. This study introduces a novel and straightforward approach for synthesizing highly effective adsorbents, with have potential implications for the removal of heavy metal ions from wastewater.

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Nitrate and Phosphate Recovery from Contaminated Waters Using Nanocellulose and its Composites

Rani

Dhaka²,

Godara

et al. 2023

Handbook of Green and Sustainable Nanotechnology

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Hollow polyethyleneimine/carboxymethyl cellulose beads with abundant and accessible sorption sites for ultra-efficient chromium (VI) and phosphate removal

Cited by 54 publications

References 69 publications

Incorporation of zero-valent silver and polyvinyl acetate on the surface matrix of carbon nanotubes for the adsorption of mercury and chromium from industrial wastewater

Incorporation of zero-valent silver and polyvinyl acetate on the surface matrix of carbon nanotubes for the adsorption of mercury and chromium from industrial wastewater

Electrospun chitosan/polymethyl methacrylate nanofiber membranes integrated with polyethyleneimine for enhanced removal of chromium(VI) ions

Nitrate and Phosphate Recovery from Contaminated Waters Using Nanocellulose and its Composites

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