Branched polyethylenimine grafted electrospun polyacrylonitrile fiber membrane: a novel and effective adsorbent for Cr(<scp>vi</scp>) remediation in wastewater

Zhao, Rui; Li, Xiang; Sun, Bolun; Li, Yanzi; Li, Yumei; Yang, Rui; Wang, Ce

doi:10.1039/c6ta09784g

Cited by 217 publications

(68 citation statements)

References 44 publications

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“…In the adsorption process, the influence of important parameters including TA content (0-5 wt %), solution pH value (1)(2)(3)(4)(5)(6)(7)(8), and contact time (10-240 min) on the adsorption of Cr(III) ions were researched by immersing 50 mg of nanofibers in Cr(III)-collagen solution in 250 mL flasks. The solution pH value was adjusted by using NaOH or HCl solution (0.1 mol L −1 ).…”

Section: Influential Factors On Adsorption Capacitymentioning

confidence: 99%

“…However, after the precipitation process, residual Cr of~20 mg L −1 remains especially in the tannery effluent because of it also contains various organic pollutants. [7][8][9]. The existence of organic compounds such as hydrolyzed collagen in the tanning effluent changes the solubility of Cr(III) in aqueous solution and makes it more difficult to removal of Cr(III) from the wastewater by chemical precipitation [10].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of PAN Electrospun Nanofibers Modified by Tannin for Effective Removal of Trace Cr(III) in Organic Complex from Wastewater

Zhang

Xue

et al. 2020

Polymers

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Removal of chromium ions is significant due to their toxicity and harmfulness, however it is very difficult to remove trace Cr(III) complexed with organics because of their strong stability. Herein, a novel electrospun polyacrylonitrile (PAN) nanofibers (NF) adsorbent was fabricated and modified by tannic acid (TA) by a facile blend electrospinning approach for removal of trace Cr(III) in an organic complex. Utilizing the large specific area of nanofibers in the membrane and the good affinity of tannic acid on the nanofibers for hydrolyzed collagen by hydrophobic and hydrogen bonds, the as-prepared PAN–TA NFM exhibited good adsorption toward Cr(III)-collagen complexes and effective reduction of total organic carbon in tannage wastewater. The maximal adsorption capacity of Cr(III) is 79.48 mg g−1 which was obtained at the pH of 7.0 and initial Cr(III) concentration of 50 mg g−1. Importantly, the batch adsorption could decrease the Cr(III) concentration from 10–20 mg L−1 to under 1.5 mg L−1, which showed great application potential for the disposal of trace metal ions in organic complexes from wastewater.

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Section: Influential Factors On Adsorption Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of PAN Electrospun Nanofibers Modified by Tannin for Effective Removal of Trace Cr(III) in Organic Complex from Wastewater

Zhang

Xue

et al. 2020

Polymers

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“…For the coating formed by rGO + PEI, the presence of the linear PEI with the influence of the rGO is observed. The coatings of linear and branched PEI exhibited a typical response for these kind of polymers [42]. Notably, the characteristic peaks of the PEI that can be seen at 2799 cm -1 are caused by mode CH2-SS, at 3279 cm -1 caused by mode NH, and at 1644 cm -1 and 1599 cm -1 caused by C=N and N-H [42][43][44].…”

mentioning

confidence: 93%

“…The coatings of linear and branched PEI exhibited a typical response for these kind of polymers [42]. Notably, the characteristic peaks of the PEI that can be seen at 2799 cm −1 are caused by mode CH 2 -SS, at 3279 cm −1 caused by mode NH, and at 1644 cm −1 and 1599 cm −1 caused by C=N and N-H [42][43][44]. For the reduced graphene oxide, peaks are observed at 1730 cm −1 caused by C=O, at 1414 cm −1 caused by the carboxy C-O and at 1622 cm −1 caused by aromatic CC [38].…”

mentioning

confidence: 99%

Comparison between Linear and Branched Polyethylenimine and Reduced Graphene Oxide Coatings as a Capture Layer for Micro Resonant CO2 Gas Concentration Sensors

Prud'homme

Nabki

2020

Sensors

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The comparison between potential coatings for the measurement of CO2 concentration through the frequency shift in micro-resonators is presented. The polymers evaluated are linear polyethylenimine, branched polyethylenimine and reduced graphene oxide (rGO) by microwave reduction with polyethylenimine. The characterization of the coatings was made by using 6 MHz gold-plated quartz crystals, and a proof-of-concept sensor is shown with a diaphragm electrostatic microelectromechanical systems (MEMS) resonator. The methods of producing the solutions of the polymers deposited onto the quartz crystals are presented. A CO2 concentration range from 0.05% to 1% was dissolved in air and humidity level were controlled and evaluated. Linear polyethylenimine showed superior performance with a reaction time obtained for stabilization after the concentration increase of 345 s, while the time for recovery was of 126 s, with a maximum frequency deviation of 33.6 Hz for an in-air CO2 concentration of 0.1%.

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“…Generally, for electrospinning, the polymer solution or melt is delivered to the spinning nozzle with a syringe pump or screw extruder, and a high‐voltage electric field is applied between the spinning nozzle and the collector . The meniscus at the end of the spinning nozzle is deformed into a Taylor cone and further stretched into a jet as the electric field strength reaches a critical value . Then, the jet undergoes a strong whipping motion.…”

Section: Introductionmentioning

confidence: 99%

Solution electrospinning with a pulsed electric field

Wang

Xie

et al. 2017

J of Applied Polymer Sci

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Getting finer fibers is one important goal of electrospinning. In this article, we introduce orthogonal experimental research of solution electrospinning with a pulsed electric field. The influences of the voltage, flow rate, frequency, and duty cycle on the mean diameter and diameter distribution of electrospun fibers were investigated. The phenomenon of electrospinning in a pulsed electric field was compared to that of electrospinning in an ordinary electric field. We found that the order of the factors that affected the fiber diameter was Duty cycle > Flow rate > Voltage > Frequency and the order of factors that affected the fiber diameter distribution was Duty cycle > Flow rate > Frequency > Voltage. In addition, compared with the ordinary electric field, the pulsed electric field apparently contributed to reductions in the mean fiber diameter and diameter distribution. In this article, we provide important evidence for the reduction of the fiber diameter with the pulsed electric field. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46130.

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Branched polyethylenimine grafted electrospun polyacrylonitrile fiber membrane: a novel and effective adsorbent for Cr(vi) remediation in wastewater

Abstract: Preparation of branched polyethylenimine grafted electrospun polyacrylonitrile fiber membrane for effective adsorption and filtration of Cr(vi).

Cited by 217 publications

References 44 publications

Fabrication of PAN Electrospun Nanofibers Modified by Tannin for Effective Removal of Trace Cr(III) in Organic Complex from Wastewater

Fabrication of PAN Electrospun Nanofibers Modified by Tannin for Effective Removal of Trace Cr(III) in Organic Complex from Wastewater

Comparison between Linear and Branched Polyethylenimine and Reduced Graphene Oxide Coatings as a Capture Layer for Micro Resonant CO2 Gas Concentration Sensors

Solution electrospinning with a pulsed electric field

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