Fabrication of core@shell structural Fe-Fe2O3@PHCP nanochains with high saturation magnetization and abundant amino groups for hexavalent chromium adsorption and reduction

Wang, Zhiwei; Wang, Yahuan; Cao, Shuai; Liu, Shaohua; Chen, Zhimin; Chen, Jiafu; Chen, Yong; Fu, Jianwei

doi:10.1016/j.jhazmat.2019.121483

Cited by 83 publications

(22 citation statements)

References 71 publications

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“…After the adsorption, the nanocomposite showed the appearance of Cr (III) and Cr (VI) peaks with molar ratios of 59.7% and 40.3%, respectively, meaning that the ppy electrons reduces the hexavalent chromium to the trivalent chromium and the adsorption process included both ions. This removal mechanism was described by many previous studies [55][56][57][58]. According to Figure 7b, N + , NH-, and N-peaks were observed with molar ratios equal to 13.8, 28.5, and 57.7%, respectively.…”

Section: Discussion On the Mechanism Of Removalsupporting

confidence: 76%

Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution

et al. 2021

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Heavy metals are toxic substances that pose a real danger to humans and organisms, even at low concentration. Therefore, there is an urgent need to remove heavy metals. Herein, the nanocellulose (NC) was synthesized by the hydrolysis of cellulose using sulfuric acid, and then functionalized using polypyrrole (ppy) through a polymerization reaction to produce polypyrrole/nanocellulose (ppy/NC) nanocomposite. The synthesized nanocomposite was characterized using familiar techniques including XRD, FT-IR, SEM, TEM, and TGA. The obtained results showed a well-constructed nanocomposite with excellent thermal stability in the nano-sized scale. The adsorption experiments showed that the ppy/NC nanocomposite was able to adsorb hexavalent chromium (Cr(VI)). The optimum pH for the removal of the heavy metal was pH 2. The interfering ions showed minor effect on the adsorption of Cr(VI) resulted from the competition between ions for the adsorption sites. The adsorption kinetics were studied using pseudo 1st order and pseudo 2nd order models indicating that the pseudo second order model showed the best fit to the experimental data, signifying that the adsorption process is controlled by the chemisorption mechanism. Additionally, the nanocomposite showed a maximum adsorption capacity of 560 mg/g according to Langmuir isotherm. The study of the removal mechanism showed that Cr(VI) ions were removed via the reduction of high toxic Cr(VI) to lower toxic Cr(III) and the electrostatic attraction between protonated ppy and Cr(VI). Interestingly, the ppy/NC nanocomposite was reused for Cr(VI) uptake up to six cycles showing excellent regeneration results. Subsequently, Cr(VI) ions can be effectively removed from aqueous solution using the synthesized nanocomposite as reusable and cost-effective adsorbent.

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Section: Discussion On the Mechanism Of Removalsupporting

confidence: 76%

Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution

et al. 2021

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“…Comparison of the maximum adsorption capacity toward Cr(VI) among different adsorbents that are prepared in this work and reported in the literature: 1,, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, and 15 …”

Section: Results and Discussionmentioning

confidence: 99%

“…The adsorption/ Figure 6. Comparison of the maximum adsorption capacity toward Cr(VI) among different adsorbents that are prepared in this work and reported in the literature: 1, 1 , 2, 42 3, 43 4, 18 5, 44 6, 45 7, 46 9, 47 10, 31 11, 38 12, 48 13, 49 The adsorption performance becoming worse with increasing adsorption/desorption measurements may be attributed to the irreversible reaction occurring between some active sites of the adsorbent and Cr(VI), 39 generating these active sites inability to be regenerated. In general, the adsorption capacity remains relatively stable, indicating that the CA-c-PEI membrane is a promising adsorbent with good regeneration ability.…”

Section: Morphology and Microstructure Of The Electrospun Porous Fibersmentioning

confidence: 99%

Electrospun Cellulose Acetate/Polyethylenimine Porous Fibers toward Highly Efficient Removal of Cr(VI)

Luo

Huang

et al. 2021

ACS Appl. Polym. Mater.

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The development of an efficient, economical, and environmentally friendly monolithic adsorbent for the removal of toxic hexavalent chromium Cr(VI) has invariably been a topic of great concern to researchers. In this paper, cellulose acetate (CA) and polyethylenimine (PEI) homogeneously blending porous fiber membranes with high porosity were successfully prepared by electrospinning, and PEI was further immobilized by cross-linking to form a stable biological adsorbent. The adsorption behavior and eliminating mechanism toward Cr(VI) by the CA-c-PEI fibrous membranes were comprehensively explored. The maximum adsorption capacity was up to 285.7 mg/g (25 °C), higher than most of the biomass-based adsorbents. Specifically, the concentration of Cr(VI) could be dramatically reduced from the initial 50 mg/L to 0.03 mg/L, much lower than the concentration standard for drinking water recommended by the World Health Organization. Even after being reused several times, the fibrous membrane still exhibited high removal efficiency.

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“…Furthermore, nitrogen atoms have a strong ability to accept electrons, and the carbon atoms adjacent to them generally carry net positive charges, which contribute to the Cr(VI) removal through electrostatic attraction [ 137 ]. Except that, hydrogen bond force, coordination interaction, cation exchange and chelating interaction, are also involved in the adsorption of Cr(VI) introduced by nitrogen-containing groups [ 64 , 143 ]. Because of the presence of electron-donating groups (e.g., amine/imine groups, carboxyl, hydroxyl, and phenol) in polymeric materials ( Table 1 ), the reduction of Cr(VI) to Cr(III) often occurs during the reactions between these adsorbents and Cr(VI).…”

Section: Mechanisms Of Cr(vi) Removalmentioning

confidence: 99%

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

Yuan

Luo

et al. 2023

Polymers

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Sorptive removal of hexavalent chromium (Cr(VI)) bears the advantages of simple operation and easy construction. Customized polymeric materials are the attracting adsorbents due to their selectivity, chemical and mechanical stabilities. The mostly investigated polymeric materials for removing Cr(VI) were reviewed in this work. Assembling of robust functional groups, reduction of self-aggregation, and enhancement of stability and mechanical strength, were the general strategies to improve the performance of polymeric adsorbents. The maximum adsorption capacities of these polymers toward Cr(VI) fitted by Langmuir isotherm model ranged from 3.2 to 1185 mg/g. Mechanisms of complexation, chelation, reduction, electrostatic attraction, anion exchange, and hydrogen bonding were involved in the Cr(VI) removal. Influence factors on Cr(VI) removal were itemized. Polymeric adsorbents performed much better in the strong acidic pH range (e.g., pH 2.0) and at higher initial Cr(VI) concentrations. The adsorption of Cr(VI) was an endothermic reaction, and higher reaction temperature favored more robust adsorption. Anions inhibited the removal of Cr(VI) through competitive adsorption, while that was barely affected by cations. Factors that affected the regeneration of these adsorbents were summarized. To realize the goal of industrial application and environmental protection, removal of the Cr(VI) accompanied by its detoxication through reduction is highly encouraged. Moreover, development of adsorbents with strong regeneration ability and low cost, which are robust for removing Cr(VI) at trace levels and a wider pH range, should also be an eternally immutable subject in the future. Work done will be helpful for developing more robust polymeric adsorbents and for promoting the treatment of Cr(VI)-containing wastewater.

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Fabrication of core@shell structural Fe-Fe2O3@PHCP nanochains with high saturation magnetization and abundant amino groups for hexavalent chromium adsorption and reduction

Cited by 83 publications

References 71 publications

Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution

Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution

Electrospun Cellulose Acetate/Polyethylenimine Porous Fibers toward Highly Efficient Removal of Cr(VI)

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

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