Negatively-charged nanofiltration membrane and its hexavalent chromium removal performance

Wei, Xiuzhen; Gan, Zhiqiang; Yu-jie, Shen; Qiu, Ze-Lin; Fang, Li‐Feng; Zhu, Bao-Ku

doi:10.1016/j.jcis.2019.06.051

Cited by 54 publications

(7 citation statements)

References 35 publications

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“…Furthermore, we compared TFC membranes prepared in this work with some other nanofiltration membranes reported in other literature studies (Figure b). − Most TFC membranes fabricated on ultrafiltration substrates or other traditional substrates show lower water permeation flux. The present membranes show relatively high water permeation flux of 16.0–21.2 L/m 2 ·h·bar and high Na 2 SO 4 rejection above 95% simultaneously, demonstrating that the TFC membranes fabricated on co-deposited MPPMs have great nanofiltration performance.…”

Section: Resultsmentioning

confidence: 96%

Interface Engineering of Microporous Polypropylene Membranes for Polyamide Thin-Film Composite Nanofiltration Membranes with Robust Structure and Superior Performance

Zhu

et al. 2023

ACS Appl. Polym. Mater.

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Nanofiltration membranes have been widely used in many fields owing to their high separation efficiency and low energy assumption. However, traditional substrates for thin-film composite (TFC) nanofiltration membranes, such as polysulfone or polyethersulfone ultrafiltration membranes, suffer from low surface porosity and poor stability in organic solvents. A microporous polypropylene membrane (MPPM) possesses high organic solvent resistance, high porosity, but poor hydrophilicity. Herein, MPPMs were surface hydrophilized for the preparation of TFC membranes by interfacial polymerization. A green, fast, and stable deposition system based on ferulic acid and Fe3+ was employed for surface hydrophilization of MPPM, and thus, the aqueous solution of piperazine can homogeneously distribute on the substrate surface, which was directly visualized by confocal laser scanning microscopy. The nanofiltration membranes show rejection of 98.1% to Na2SO4 and water permeation flux of about 16 L/m2·h·bar. Moreover, the membranes are stable in a variety of common organic solvents, demonstrating the potential in organic solvent nanofiltration. The proposed strategy expands the selection of porous substrates for interfacial polymerization and harsh application environments for nanofiltration.

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Section: Resultsmentioning

confidence: 96%

Interface Engineering of Microporous Polypropylene Membranes for Polyamide Thin-Film Composite Nanofiltration Membranes with Robust Structure and Superior Performance

Zhu

et al. 2023

ACS Appl. Polym. Mater.

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“…Journal of Chemistry ere was reported competition for the same sorption sites with metal ions by hydrogen ions at low pH values, and it is therefore suggested that the sites of adsorption on the surface of the WM are taken up by hydrogen ions (H + ), making the surface positively charged. en, the negatively charged ions HCrO4 − will approach and spontaneously access the binding sites on the adsorbent in order to pick up the more important metal ions due to the electrical attraction with the positive sites generated by the H + [28].…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Eco-Friendly Adsorbent from Waste of Mint: Application for the Removal of Hexavalent Chromium

Khammour

Abdoul-Latif

Ainane

et al. 2021

Journal of Chemistry

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A serious environmental disaster is looming on the horizon due to the indiscriminate release of heavy metals into the soil and wastewater from human industrial practices. In this study, waste mint (WM) was used to remove chromium(VI) from aqueous solution using batch experiments. The adsorbent material (WM) was characterized using scanning electron microscopy coupled with energy dispersive analysis of X-ray spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The adsorption parameters optimized were as follows: pH solution (2–11), initial concentration of Cr(VI) (10–50 mg/L), adsorbent dose (0.1–10 g/L), and temperature conditions (298 K, 308 K, and 318 K). The experimental data fitted well to the fractional power kinetic model (0.97≤R2≤ 0.99) and Langmuir isotherm (R2 = 0.984) with a maximum adsorption capacity Qmax = 172.41 mg/g. The thermodynamic parameters for Cr(VI) sorption were also calculated, confirming that the adsorption process was spontaneous and accompanied by an exothermic adsorption (−4.83 ≤ ΔG ≤ −3.22 kJ/mol and ΔH = −28.93 kJ/mol). The Cr(VI) removal percentage was within the range of 41–98%, and the highest removal was noted at pH = 2. The results of the present study suggest that WM is a potential low-cost adsorbent for the removal of chromium(VI) from aqueous solutions.

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“…During the last decade, many physical, chemical, and biological treatment methods have been used to remove chromium compounds from contaminated soils, sediments, and water. Conventional methods, such as chemical precipitation [ 21 , 22 ], adsorption [ 23 , 24 ], coagulation [ 25 ], ion exchange [ 26 , 27 ], and membrane separation [ 28 , 29 ] have been used to remove chromium-containing contaminants from industrial waste. Unfortunately, most of the methods listed above are only effective in removing chromium compounds from liquid media.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Hexavalent Chromium Using Self-Compacting Soil Technology

et al. 2022

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A study of immobilization of hexavalent chromium in the form of Na2CrO4 salt by self-compacting soils (SCS) is presented. Carbofill E additive was used as SCS binder. The efficiency of immobilization of Cr (VI) was evaluated by washing out chromium compounds from SCS samples. The influence of the nature of the soil and the content of Carbofill E and Na2CrO4 in the SCS samples on the efficiency of Cr (VI) immobilization was studied. It was found that the nature of the soil and the content of Carbofill E in the SCS samples affect the immobilization of Cr (VI). Moreover, increasing the Carbofill E content in SCS samples further increases Cr (VI) immobilization. X-ray diffraction studies of the samples with immobilized hexavalent chromium showed that part of the sample transforms from a readily soluble form of salt into oxide forms of chromium and calcium-chromium, which are practically insoluble in water.

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Negatively-charged nanofiltration membrane and its hexavalent chromium removal performance

Cited by 54 publications

References 35 publications

Interface Engineering of Microporous Polypropylene Membranes for Polyamide Thin-Film Composite Nanofiltration Membranes with Robust Structure and Superior Performance

Interface Engineering of Microporous Polypropylene Membranes for Polyamide Thin-Film Composite Nanofiltration Membranes with Robust Structure and Superior Performance

Eco-Friendly Adsorbent from Waste of Mint: Application for the Removal of Hexavalent Chromium

Immobilization of Hexavalent Chromium Using Self-Compacting Soil Technology

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