Chitosan-rectorite nanospheres immobilized on polystyrene fibrous mats via alternate electrospinning/electrospraying techniques for copper ions adsorption

Tu, Hu; Huang, Mengtian; Yang, Yi; Li, Zhenshun; Zhan, Yingfei; Chen, Jiajia; Yang, Wu; Shi, Xiaowen; Deng, Hongbing; Du, Yumin

doi:10.1016/j.apsusc.2017.07.159

Cited by 45 publications

(23 citation statements)

References 43 publications

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“…For one thing, the Cu(II) metal ions with positive charges can easily interact with the surface of electrospun membrane. Cu(II) would hydrolyze to Cu(OH) 2 , Cu(OH) + , and Cu 2 (OH) 2 2+ when the pH over 5 which will promote the adsorption [47,50]. Whereas, further increase in the pH level once at high pH, i.e., pH > 7 (alkaline solutions), the metal cations start to react with hydroxide ions to form metal hydroxide and get precipitated.…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication of Multi-Structured SiO2@PVDF-HFP Nanofibrous Membranes for Enhanced Copper Ions Adsorption

Wang

Ren

et al. 2018

Polymers

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The low-cost, heavy metal ion (Cu(II)) adsorptive multi-structured nanofibrous membranes of silicon oxide naonoparticles in-situ anchored polyvinylidene fluoride-hexafluoropropylene (SiO2@PVDF-HFP) fibers were fabricated by the facile electrospinning technique combined with sol–gel strategy. To explore the benefits of the structure-related Cu(II) adsorption capacity, the fiber diameters of SiO2@PVDF-HFP nanofibrous membranes were changed which also resulted in the change of their porosity. Taking advantage of the constructed multi-structures and efficient fiber morphology regulation which not only changed the PVDF-HFP nanofibrous membrane from hydrophobic to superhydrophilic but also increased the porosity of the membrane, the SiO2@PVDF-HFP nanofibrous membrane with a smaller diameter and a larger porosity exhibits higher Cu(II) adsorption capacity. The adsorption amount was approximate to 21.9 mg per gram of the membrane, which was higher than that of membranes with larger fiber diameter (smaller porosity) and the smooth one. Furthermore, the model isotherms of Freundlich and Langmuir, as well as the kinetic models of pseudo-first-order and pseudo-second-order were preferred to analyze the adsorption equilibrium data. The Freundlich model and the pseudo-first-order were well fitted to the adsorption experimental data. It not only uncovers the structure-related-property of multi-structured nanofibrous membranes, but also provides an efficient and facile way to design heavy metal ion adsorption materials.

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Section: Resultsmentioning

confidence: 99%

Facile Fabrication of Multi-Structured SiO2@PVDF-HFP Nanofibrous Membranes for Enhanced Copper Ions Adsorption

Wang

Ren

et al. 2018

Polymers

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“…More recently, four research studies have shown that an error in the use of a pseudofirst-order kinetic model requires correction [15][16][17][18]. Moreover, Tseng and Wu [19] proposed a convenient method to determine kinetic parameters of adsorption processes by nonlinear regression of the PFO, PSO and pseudo-nth-order (PNO) equations with SigmaPlot 11 software.…”

Section: Introductionmentioning

confidence: 99%

Novel adsorption model of filtration process in polycarbonate track-etched membrane: Comparative study

Adda

Hanini

Abbas³

et al. 2019

Environmental Engineering Research

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Current assumptions are used in the formulation of pseudo-first (PFO) and second-order (PSO) models to describe the kinetic data of filtration based on ideal operating conditions. This paper presents a new model developed with pseudo nth order and based on real assumption. A comparison was performed between PFO, PSO and the new model to highlight their performance and the optimisation of the pseudo-order equation, using MATLAB software. Adsorption characteristic of bovine serum albumin adsorption on the track-etched membrane are used as a medium based on protein filtration data were extracted from the literature for different concentrations to demonstrate the comparison between PFO/PSO and the new model. The pseudo first and second-order kinetic models were applied to test the experimental data and they did not provide reasonable values. The results show that the predicted values are consistent with experimental values giving a good correlation coefficient R2 = 0.997 and a minimum root mean squared error RMSE = 0.0171. Indeed, the experimental results follow the new model and the optimal pseudo equation order n = 1.115, the most suitable curves for the new model. As a result, we used different experimental adsorption data from the literature to examine and check the applicability and validity of the model.

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“…Its special structure is alternate pairs of dioctahedral mica-like layer (non-expansible) and dioctahedral smectite-like layer (expansible) existing in 1:1 ratio. There are some cations (Na + , K + and Ca 2+ ) and hydrated cations with exchangeability, which can enlarge its interlayer distance by intercalating cations or polar molecules existing in the interlayer regions.Over several decades, there are more and more investigations on the adsorption of metal ions by REC or its synthesis [17][18][19][20][21]. For example, Mei et al [17] and Zhao et al [22] studied separately the adsorption behaviors of Pb(II) by Ca-rectorite and Sr(II) by Na-rectorite as a function of different environmental parameters including the influence of pH, temperature, ionic strength and humic acid (HA) under ambient conditions.…”

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confidence: 99%

“…Both of them found that the adsorption results of heavy metals were intensely decided by pH and ionic strength and the adsorption process was spontaneous and endothermic. In addition, more and more synthetic composite materials of REC have been researched to adsorb different pollutants [18][19][20]23]. These composites can combine both excellent performances of their components, such as good thermostability, mechanical property and adsorption capacity, the synergies can help them obtain superior adsorption capacity to heavy metal ions [24].…”

mentioning

confidence: 99%

“…Over several decades, there are more and more investigations on the adsorption of metal ions by REC or its synthesis [17][18][19][20][21]. For example, Mei et al [17] and Zhao et al [22] studied separately the adsorption behaviors of Pb(II) by Ca-rectorite and Sr(II) by Na-rectorite as a function of different environmental parameters including the influence of pH, temperature, ionic strength and humic acid (HA) under ambient conditions.…”

mentioning

confidence: 99%

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Different Insights into Silicate Rectorite Modification and Its Role in Removal of Heavy Metal Ions from Wastewater

Gao¹,

Jiang²,

Li³

et al. 2020

Minerals

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In the field of water management, the separation of metal contaminants from wastewater is very important and challenging. This study systematically investigated the effect and underlying mechanism of silicate rectorite (REC) on the removal of heavy metal ions (Cr(VI) and Pb(II)) from wastewater. The adsorption and removal capacity of REC was further improved by its novel modification with ferric chloride hexahydrate. Compared to natural REC, the modified rectorite (Fe-REC) showed comparatively superior adsorption efficiency for both Cr(VI) and Pb(II) due to the chemisorption of Fe 3+ on the REC surface as its oxidation state (Fe-O, Fe-OH, Fe-OOH). Adsorption on Cr(VI) attributed to the reaction between iron hydroxy complexes (FeOH 2+ , Fe(OH) 2 + and Fe(OH) 3 (aq)) and Cr(VI) species (HCrO 4 − and CrO 4 2− ) in the aqueous solution. This reaction was perfectly consistent with the binding energy shifts in O 1s and Fe 2p species, as reflected by XPS analysis. While, the existence of -Al-OH and -Si-OH in silicate REC slurry reacted with PbOH + colloids produced from lead ions hydrolysis to promote Pb(II) adsorption. Zeta potential after modification and removal occurred to shift positively or negatively to testify the adsorption of Fe 3+ and heavy metal ions. Freundlich and Langmuir isotherms conformed adsorption process for Cr(VI) and Pb(II), respectively.Minerals 2020, 10, 176 2 of 16 and economical approach that is widely used in wastewater treatment procedures. In adsorption, a variety of adsorbent including activated carbons, clay mineral, biomasses and synthetic polymers was employed [8,[10][11][12][13]. However, common adsorbents such as activated carbon are expensive, thus some natural resources such as polysaccharides, fly ash and clay have attracted much attention due to their low cost and easy access. In this series of materials, rectorite (REC) was applied more and more in pollutant adsorption from sewage owing to its low cost, high ion exchange capacity and relatively large specific area [14][15][16][17]. It is a sort of rare regularly interstratified silicate and similar to kaolinite. Its special structure is alternate pairs of dioctahedral mica-like layer (non-expansible) and dioctahedral smectite-like layer (expansible) existing in 1:1 ratio. There are some cations (Na + , K + and Ca 2+ ) and hydrated cations with exchangeability, which can enlarge its interlayer distance by intercalating cations or polar molecules existing in the interlayer regions.Over several decades, there are more and more investigations on the adsorption of metal ions by REC or its synthesis [17][18][19][20][21]. For example, Mei et al. [17] and Zhao et al. [22] studied separately the adsorption behaviors of Pb(II) by Ca-rectorite and Sr(II) by Na-rectorite as a function of different environmental parameters including the influence of pH, temperature, ionic strength and humic acid (HA) under ambient conditions. Both of them found that the adsorption results of heavy metals were intensely decided by pH and ionic strength and the...

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Chitosan-rectorite nanospheres immobilized on polystyrene fibrous mats via alternate electrospinning/electrospraying techniques for copper ions adsorption

Cited by 45 publications

References 43 publications

Facile Fabrication of Multi-Structured SiO2@PVDF-HFP Nanofibrous Membranes for Enhanced Copper Ions Adsorption

Facile Fabrication of Multi-Structured SiO2@PVDF-HFP Nanofibrous Membranes for Enhanced Copper Ions Adsorption

Novel adsorption model of filtration process in polycarbonate track-etched membrane: Comparative study

Different Insights into Silicate Rectorite Modification and Its Role in Removal of Heavy Metal Ions from Wastewater

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