A strategy to facilitate the sedimentation and bactericidal properties of polypyrrole for fluoride removal from water

Zhang, Juantao; Yan, Xuanye; Liu, Jinbo; Sun, Yaxing; Guo, Ziyu; Wang, Ling; Wang, Xi; Wang, Zhenyu; Fan, Lei; Feng, Jiangtao; Li, Shanshan; Yan, Wei

doi:10.1016/j.seppur.2022.120619

Cited by 13 publications

(7 citation statements)

References 72 publications

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“…1), in agreement with that reported in the literature. 50,51 Following comparison with the FTIR spectra from the literature, the chemical bonds of PPy were shown to be intact (Fig. 2c).…”

Section: Resultsmentioning

confidence: 92%

Green synthesis of polypyrrole for CO₂ capture from humid flue gases

Wang

Liu

et al. 2023

Green Chem.

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“…1), in agreement with that reported in the literature. 50,51 Following comparison with the FTIR spectra from the literature, the chemical bonds of PPy were shown to be intact (Fig. 2c).…”

Section: Resultsmentioning

confidence: 92%

Green synthesis of polypyrrole for CO₂ capture from humid flue gases

Wang

Liu

et al. 2023

Green Chem.

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“…The removal efficiency of fluoride was increased with the increase in contact time. This is due to the mass transfer driving force between the fluoride ion and active sites 31,32 …”

Section: Resultsmentioning

confidence: 99%

“…The system's pH directs the fluoride removal due to the factors affecting the fluoride ions specification in solutions, the charge density of the adsorbent, and the degree of dissociation. 32,33 The fluoride removal efficiency was increased with initial pH (up to 7) and gradually reduced at higher pH (>7). This could be attributed to the partially formed acidic medium-weak bond hydrofluoric acid; therefore, the fluoride removal was less than the neutral pH shown in Equations ( 1) and ( 2).…”

Section: Present Model Prediction Accuracy For Fluoride Removalmentioning

confidence: 98%

Modeling the adsorption process for fluoride removal from groundwater by machine learning

Reddy,

Maurya,

Hyeon‐A

et al. 2023

Env Prog and Sustain Energy

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Worldwide, groundwater pollution with heavy metals is a severe concern, threatening living organisms and drinking water safety. High fluoride concentration is a common pollutant among various heavy metals found in groundwater. The adsorption method was more convenient, efficient, economically feasible, and eco‐friendly for removing the excess fluoride from groundwater. The fluoride removal efficiency depends on the adsorption process variables such as contact time, pH, alumina dose, temperature, and agitation speed. The association between fluoride removal and adsorption process variables is complex and non‐linear. The present study developed an artificial neural networks (ANN) model to calculate the effect and analyze the relationship between adsorption process variables and fluoride removal. The ANN model was trained using the backpropagation algorithm. The estimated fluoride removal was in good agreement with the experimental observations, with an accuracy of (R2 >99.6) for both training and testing datasets, and was superior to the existing models. The accurate predictions exposed that the model could adequately estimate the relationships between adsorption process variables and fluoride removal from groundwater.

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“…The redox potential of Cr(VI) decreases with the increasing pH, and Cr(VI) mainly exists in the anionic form in solution [ 35 ]. The isoelectric point of PPy is at pH ~ 4.3, and it carries positive charges on its surface in pH < 4.3 solution [ 36 ]. The enhanced reduction of Cr(VI) to Cr(III) and the increased electrostatic attractions between chromium and PPy-based adsorbents jointly contributed to Cr(VI) removal at pH ~ 2.0 [ 35 ].…”

Section: Polymers Used For 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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A strategy to facilitate the sedimentation and bactericidal properties of polypyrrole for fluoride removal from water

Cited by 13 publications

References 72 publications

Green synthesis of polypyrrole for CO₂ capture from humid flue gases

Green synthesis of polypyrrole for CO₂ capture from humid flue gases

Modeling the adsorption process for fluoride removal from groundwater by machine learning

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

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A strategy to facilitate the sedimentation and bactericidal properties of polypyrrole for fluoride removal from water

Cited by 13 publications

References 72 publications

Green synthesis of polypyrrole for CO2 capture from humid flue gases

Green synthesis of polypyrrole for CO2 capture from humid flue gases

Modeling the adsorption process for fluoride removal from groundwater by machine learning

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

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Product

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Green synthesis of polypyrrole for CO₂ capture from humid flue gases

Green synthesis of polypyrrole for CO₂ capture from humid flue gases