Removal of Cr(VI) from Aqueous Solution by Polypyrrole/Hollow Mesoporous Silica Particles

Du, Linlin; Gao, Peng; Liu, Yuanli; Minami, Tsuyoshi; Yu, Chuanbai

doi:10.3390/nano10040686

Cited by 18 publications

(7 citation statements)

References 41 publications

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“…The comparison of the performance of various materials shows that the amino modified mesoporous silica prepared by co-condensation in the present study is superior in Cr(VI) removal to the most of the materials listed in the cited sources, with the exception of some organic polymer conjugated silica nanoparticles, such as poly(catechol-tetraethylenepentamine)@SiO 2 -NH 2 [ 66 ], polyethylenimine-silica nanocomposite [ 69 ], or polypyrrole-silica [ 70 ]. Our study shows that the simple method of co-condensation of functionalized silica precursors in the presence of pore forming surfactant molecules leads to cheap and competitive materials suitable for metal ion removal from waste waters.…”

Section: Resultsmentioning

confidence: 99%

Comparison of Structure and Adsorption Properties of Mesoporous Silica Functionalized with Aminopropyl Groups by the Co-Condensation and the Post Grafting Methods

et al. 2021

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The adsorptive potential has been evaluated for the aminopropyl functionalized mesoporous silica materials obtained by co-condensation and post grafting methods. Nitrogen sorption, small angle neutron and X-ray scattering (SANS and SAXS) demonstrated high surface area and well-ordered hexagonal pore structure suitable for applications as adsorbents of metals from waste waters. A comparison of Cr(VI) adsorption properties of the materials prepared by different functionalization methods has been performed. The obtained results demonstrated the adsorption capacity due to the affinity of the chromium ions to the amino groups, and showed that co-condensation of tetraethoxysilane (TEOS) and 3-aminopropyl triethoxysilane (APTES) resulted in higher metal sorption capacity of the materials compared to post-synthesis grafting of aminopropyl groups onto the mesoporous silica particles.

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Section: Resultsmentioning

confidence: 99%

Comparison of Structure and Adsorption Properties of Mesoporous Silica Functionalized with Aminopropyl Groups by the Co-Condensation and the Post Grafting Methods

et al. 2021

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“…Several adsorbents have been documented for Cr(VI) ions removal. However, some challenges have been encountered including, tedious and expensive methods of preparation, generation of additional solid wastes, low adsorption capacities owing to the low specific surface areas and unavailability of active functional groups (Dinker and Kulkarni 2015;Liu et al 2017;Hato et al 2019;Du et al 2020;Li et al 2020). It is worthy reviewing polypyrrole (PPy)-based adsorbents because of their unique and enhanced properties PPy has shown great prospects in adsorption application due to its reputable environmental stability, extraordinary conductance, desirable redox properties and easiness of processing (Das and Prusty 2012;Maity et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole-based adsorbents for Cr(VI) ions remediation from aqueous solution: a review

Chigondo¹,

Nyamunda²,

Maposa³

et al. 2022

Water Science and Technology

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Anthropogenic activities are principally responsible for the manifestation of toxic and carcinogenic hexavalent chromium (Cr(VI)) triggering water pollution that threaten the environment and human health. The World Health Organisation (WHO) restricts Cr(VI) ions concentration to 0.1 and 0.05 mg/L in inland surface water and drinking water, respectively. The available technologies for Cr(VI) ions removal from water were highlighted with emphasis on adsorption technology. Furthermore, the characteristics of several polypyrrole-based adsorbents were scrutinized including amino containing compounds, biosorbents, graphene/graphene oxide, clay materials and many other additives with reported effective Cr(VI) ions uptake. This efficiency in Cr(VI) ions adsorption is attributed to enhanced redox properties, increased number of functional groups and well as synergistic behaviour of the materials making up the composite. The Langmuir isotherm best described the adsorption processes with maximum adsorption capacities ranging from 3.40–961.50 mg/g. The regeneration of Cr(VI) ions laden adsorbents was studied. Ion exchange, electrostatic attractions, complexation, chelation reactions with protonated sites and the reduction were the mechanisms of adsorption. Nevertheless, there are limited details on comprehensive adsorbent regeneration studies to prolong robustness in adsorption-desorption cycles and utilization of the Cr(VI) ions laden adsorbent in other areas of research to limit the threat of secondary pollution.

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“…2) The Cr(VI) of HCrO 4 − group and the surface N + are attracted to the adsorption site via electrostatic interactions. [ 26 ] 3) The Cr 6+ ions are reduced to Cr 3+ ions by the two active π electronics of the PPy ring, confirming that N, S‐GO/PPy foam possesses strong reduction ability for removal of the high‐toxicity Cr 6+ to low‐toxicity Cr 3+ . Therefore, the combination of N,S‐GO and PPy can accelerate the removal rate of high‐toxicity Cr 6+ irons than that of pure PPy.…”

Section: Resultsmentioning

confidence: 84%

“…Fortunately, the polypyrrole (PPy) has been demonstrated to possess a strong reduction ability for the removal of the Cr 6+ to Cr 3+ in the wastewater. [ 17 ] In addition, the hierarchical PPy foam also has an outstanding solar–thermal conversion efficiency. [ 18 ]…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole‐Reinforced N,S‐Doping Graphene Foam for Efficient Solar Purification of Wastewater

Ning

et al. 2021

Solar RRL

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Solar vapor generation is a sustainable and cost‐effective approach to addressing the issue of water shortage. However, the challenges of solar steam generation still exist for achieving a high evaporation efficiency combined with long‐term stability in the wastewater containing heavy metal ions and wide degrees of acidity and alkalinity (pH = 1–14). Herein, polypyrrole (PPy) loading on the N,S‐doped graphene oxide (N,S‐GO) foam is used for high‐efficiency solar evaporation of treating wastewater. With the advantages of excellent broadband solar absorption ( >97%), extremely low emissivity (0.70), and outstanding hydrophilicity, the N,S‐GO/PPy foam achieves a high evaporation efficiency of 90.5% under 1 sun illumination. More notably, the N,S‐GO/PPy foam has strong adsorption of heavy metal ions (Fe3+, Cu2+, and Cr6+) for treating wastewater synchronously evaporates at higher efficiencies of 94.7–98.4%. Interestingly, the high‐toxicity Cr6+ can be reduced to low‐toxicity Cr3+ effectively by the synergistic effect of N,S‐GO and PPy. In addition, the N,S‐GO foam shows a better long‐term resistance of acidity and alkalinity for 45 days. A new insight is offered into high‐efficiency solar evaporation for treating wastewater and water purification.

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Removal of Cr(VI) from Aqueous Solution by Polypyrrole/Hollow Mesoporous Silica Particles

Cited by 18 publications

References 41 publications

Comparison of Structure and Adsorption Properties of Mesoporous Silica Functionalized with Aminopropyl Groups by the Co-Condensation and the Post Grafting Methods

Comparison of Structure and Adsorption Properties of Mesoporous Silica Functionalized with Aminopropyl Groups by the Co-Condensation and the Post Grafting Methods

Polypyrrole-based adsorbents for Cr(VI) ions remediation from aqueous solution: a review

Polypyrrole‐Reinforced N,S‐Doping Graphene Foam for Efficient Solar Purification of Wastewater

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