Fabrication of Electrospun Polyamide-6/Chitosan Nanofibrous Membrane toward Anionic Dyes Removal

Nanofibrous filter media of polyamide-6/chitosan were fabricated by electrospinning onto a satin fabric substrate and characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and water contact angle (WCA). Anionic dye removal capability of the filter was investigated for Solophenyl Red 3BL and Polar Yellow GN, respectively, as acidic and direct dyes were investigated with respect to solution parameters (pH and initial dye concentration) and membrane parameters (electrospinning time and chitosan ratio) through filtration system. Experiments were designed using response surface methodology (RSM) based on five-level central composite design (CCD) with four parameters to maximize removal efficiency of the filter media. Moreover, the effect of parameters and their likely interactions on dye removal were investigated by mathematically developed models. The optimum values for solution pH, initial dye concentration, electrospinning time, and chitosan ratio were predicted to be 5, 50 mg/L, 4 hr, 30% and 5, 100 mg/L, 4 hr, 10%, respectively, for achieving 96% and 95% removal of Solophenyl Red 3BL and Polar Yellow GN. Evaluation of the estimation capability of applied models revealed that the models have a good agreement with experimental values. This study demonstrated that polyamide-6/chitosan nanofibrous membrane has an enormous applicable potential in dye removal from aqueous solutions.

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Fabrication of acrylic modified surface of polyamide 6/CaO electrospun nanofibrous membrane for effective dye removal

Egyptian Journal of Chemistry ◽

10.21608/ejchem.2019.19498.2187 ◽

2019 ◽

Vol 0 (0) ◽

pp. 0-0

Author(s):

Rokaya Sobh ◽

Wael Mohamed ◽

Basma Ekram

Keyword(s):

Dye Removal ◽

Polyamide 6 ◽

Nanofibrous Membrane ◽

Modified Surface

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Effect of main-stage filter media selection on the loading performance of a two-stage filtration system

Building and Environment ◽

10.1016/j.buildenv.2021.107745 ◽

2021 ◽

Vol 195 ◽

pp. 107745

Author(s):

Xinjiao Tian ◽

Qisheng Ou ◽

Chenxing Pei ◽

Zhenming Li ◽

Jingxian Liu ◽

...

Keyword(s):

Media Selection ◽

Main Stage ◽

Filter Media ◽

Two Stage ◽

Filtration System

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Quaternization of Poly(2-diethyl aminoethyl methacrylate) Brush-Grafted Magnetic Mesoporous Nanoparticles Using 2-Iodoethanol for Removing Anionic Dyes

Applied Sciences ◽

10.3390/app112110451 ◽

2021 ◽

Vol 11 (21) ◽

pp. 10451

Author(s):

Khalid Mohammed Alotaibi ◽

Abdurrahman A. Almethen ◽

Abeer M. Beagan ◽

Hassan M. Al-Swaidan ◽

Ashfaq Ahmad ◽

...

Keyword(s):

Mesoporous Silica Nanoparticles ◽

High Surface ◽

High Surface Area ◽

Polymer Chains ◽

Sunset Yellow ◽

Anionic Dyes ◽

Solution Ph ◽

Effects Of Ph ◽

Weak Adsorption ◽

Ph Level

Magnetic mesoporous silica nanoparticles (Fe3O4-MSNs) were successfully synthesized with a relatively high surface area of 568 m2g−1. Fe3O4-MSNs were then modified with poly(2-diethyl aminoethyl methacrylate) (PDEAEMA) brushes using surface-initiated ARGET atom transfer radical polymerization (ATRP) (Fe3O4@MSN-PDMAEMA). Since the charge of PDEAEMA is externally regulated by solution pH, tertiary amines in the polymer chains were quaternized using 2-iodoethanol to obtain cationic polymer chains with a permanent positive charge (Fe3O4@MSN-QPDMAEMA). The intensity of the C−O peak in the C1s X-ray photoelectron spectrum increased after reaction with 2-iodoethanol, suggesting that the quaternization process was successful. The applicability of the synthesized materials on the removal of methyl orange (MO), and sunset yellow (E110) dyes from an aqueous solution was examined. The effects of pH, contact time, and initial dyes concentrations on the removal performance were investigated by batch experiments. The results showed that the Fe3O4@MSN-PDMAEMA sample exhibited a weak adsorption performance toward both MO and E110, compared with Fe3O4@MSN-QPDMAEMA at a pH level above 5. The maximum adsorption capacities of MO and E110 using Fe3O4@MSN-QPDMAEMA were 294 mg g−1 and 194.8 mg g−1, respectively.

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Effect of Praestol as a Coagulant-Aid to Improve Coagulation-Flocculation in Dye containing Wastewaters

Global NEST Journal ◽

10.30955/gnj.001738 ◽

2015 ◽

Vol 18 (1) ◽

pp. 38-46 ◽

Cited By ~ 2

Keyword(s):

Ionic Strength ◽

Aqueous Solutions ◽

Removal Efficiency ◽

Dye Removal ◽

Settling Time ◽

Solution Ph ◽

Polyaluminum Chloride ◽

Flocculation Process ◽

Flocculation Time

<div> This study was conducted to investigate the effect of praestol, as a coagulant-aid, to improve coagulation-flocculation process in the removal of disperse red 60 from aqueous solutions. The effect of various parameters including coagulants dose (10-1000 mg l-1), praestol dose (0-1000 mg l-1), solution pH (3-11), initial dye concentration (100-500 mg l-1), flocculation speed (30-60 rpm), flocculation time (15-30 min), settling time (5-60 min) and ionic strength (0-6 mg l-1) was evaluated on the dye removal. The dye removal efficiency was substantially increased by using praestol in the concentration of 80 mg l-1 and 400 mg l-1 for coagulation with alum and polyaluminum chloride (PACl), respectively. The maximum dye removal by alum coupled with praestol (Al-P) and PACl coupled with praestol (PA-P) was found to be 97.8% and 98.7%, respectively that were occurred at pH 7. The results showed that the application of PA-P or Al-P can be effectively used to remove disperse red 60 (DR 60) in aqueous solutions. </div>

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Stormwater runoff treatment filtration system and backwashing system

Water Science & Technology ◽

10.2166/wst.2019.097 ◽

2019 ◽

Vol 79 (4) ◽

pp. 771-778 ◽

Cited By ~ 2

Author(s):

Junho Lee ◽

Myungjin Lee

Keyword(s):

Particle Size ◽

Removal Efficiency ◽

Recovery Rate ◽

Stormwater Runoff ◽

Pilot Scale ◽

Solid Loading ◽

Filter Media ◽

Turbidity Removal ◽

Filtration System ◽

Combined Sewer

Abstract This study has been carried out to evaluate the applicability of the pilot scale hybrid type of stormwater runoff treatment system for treatment of combined sewer overflow. Also, to determine the optimum operation parameter such as coagulation dosage concentration, effectiveness of coagulant usage, surface loading rate and backwashing conditions. The pilot scale stormwater filtration system (SFS) was installed at the municipal wastewater plant serving the city of Cheongju (CWTP), Korea. CWTP has a capacity of 280,000 m3/day. The SFS consists of a hydrocyclone coagulation/flocculation with polyaluminium chloride silicate (PACS) and an upflow filter to treat combined sewer overflows. There are two modes (without PACS use and with PACS use) of operation for the SFS. In case of no coagulant use, the range of suspended solids (SS) and turbidity removal efficiency were 72.0–86.6% (mean 80.0%) and 30.9–71.1% (mean 49.3%), respectively. And, the recovery rate of filter was 79.2–83.6% (mean 81.2%); the rate of remaining solid loading in filter media was 16.4–20.8% (mean 18.8%) after backwashing. The influent turbidity, SS concentrations were 59.0–90.7 NTU (mean 72.0 NTU), 194.0–320.0mg/L (mean 246.7mg/L), respectively. The range of PACS dosage concentration was 6.0–7.1mg/L (mean 6.7mg/L). The range of SS and turbidity removal efficiency was 84.9–98.2 (mean 91.4%) and 70.7–96.3 (mean 84.0%), respectively. It was found that removal efficiency was enhanced with PACS dosage. The recovery rate of filter was 92.0–92.5% (mean 92.3%) the rate of remaining solid loading in filter media was 6.1–8.2% (mean 7.2%) after backwashing. In the case of coagulant use, the particle size of the effluent is bigger than influent particle size. The results showed that SFS with PACS use more effective than without PACS use in SS and turbidity removal efficiency and recovery rate of filter.

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Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

ACS Applied Materials & Interfaces ◽

10.1021/acsami.0c05927 ◽

2020 ◽

Vol 12 (24) ◽

pp. 27745-27757

Author(s):

Tuula Selkälä ◽

Terhi Suopajärvi ◽

Juho Antti Sirviö ◽

Tero Luukkonen ◽

Paivo Kinnunen ◽

...

Keyword(s):

Surface Modification ◽

Cellulose Nanocrystals ◽

Dye Removal ◽

Filter Media ◽

Anionic Dye

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Recycling of Direct Dyes Wastewater by Nylon-6 Nanofibrous Membrane

Current Nanoscience ◽

10.2174/157341311796196899 ◽

2011 ◽

Vol 7 (4) ◽

pp. 633-639 ◽

Cited By ~ 5

Author(s):

Fereshteh Basiri ◽

Seyed Abdolkarim Hosseini Ravandi ◽

Mahmoud Feiz ◽

Ahmad Moheb

Keyword(s):

Nylon 6 ◽

Nanofibrous Membrane ◽

Direct Dyes

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Upflow Filtration System Using Fiber-Ball Filter Media for the Treatment of Nonpoint Pollution

Journal of Korean Society of Environmental Engineers ◽

10.4491/ksee.2021.43.3.146 ◽

2021 ◽

Vol 43 (3) ◽

pp. 146-159

Author(s):

Junho Lee ◽

Daesik Song

Keyword(s):

Particle Size ◽

Removal Efficiency ◽

Retention Time ◽

Fine Particles ◽

Head Loss ◽

Sem Analysis ◽

Operating Conditions ◽

Filter Media ◽

Filtration System ◽

Fiber Ball

Objectives : The objective of this study is to investigate the performance of the fiber-ball media upflow filtration system for non-point pollutants treatment.Methods : The additional air backwashing nozzle were installed between upper and lower fliter media cartridge. The effect of feed SS concentration, surface overflow rate, retention time, head loss on the removal efficiency were investigated respectively. Particle size distribution, SEM, and backwashing effect were also analyzed.Results and Discussion : The operated of upflow filter mean retention time, mean head loss were 1.99 min, 7.2 cm. On condition of SOR 480 m3/m2/day, results indicate that the range of removal efficiency of turbidity and SS were 76.8 ~ 93.21% (mean 88.3%) and 85.4 ~ 97.9% (mean 92.7%), respectively. The effluent turbidity and SS were under 15 NTU, 20 mg/L, respectively.Conclusions : Since turbidity can be continuously monitored in a filtration non-point pollution treatment system, turbidity can be used as a operation factor in evaluating operating conditions. The particle size the effluent larger than the influent was due to bonding, collision and adsorption between particles in the pores of the filter media. SEM analysis showed that after backwashing, very fine particles in the filter medium were not removed but adhered to the fiber yarn and remained. The average recovery rate of fiber-ball media filtration was 88.7%, which is evaluated as excellent in backwashing.

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Surface Modification of Bentonite with Polymer Brushes and Its Application as an Efficient Adsorbent for the Removal of Hazardous Dye Orange I

Nanomaterials ◽

10.3390/nano10061112 ◽

2020 ◽

Vol 10 (6) ◽

pp. 1112 ◽

Cited By ~ 3

Author(s):

Wenjuan Guo ◽

Ahmad Umar ◽

Yankai Du ◽

Luyan Wang ◽

Meishan Pei

Keyword(s):

Polymer Brushes ◽

Adsorption Property ◽

Gravimetric Analysis ◽

Order Kinetic ◽

X Ray Diffraction ◽

Anionic Dyes ◽

Solution Ph ◽

Experimental Conditions ◽

Pseudo Second Order ◽

First Time

Poly(2-(dimethylamino)ethyl methacrylate)-grafted bentonite, marked as Bent-PDMAEMA, was designed and prepared by a surface-initiated atom transfer radical polymerization method for the first time in this study. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA) were applied to characterize the structure of Bent-PDMAEMA, which resulted in the successful synthesis of Bent-PDMAEMA. As a cationic adsorbent, the designed Bent-PDMAEMA was used to remove dye Orange I from wastewater. The adsorption property of Bent-PDMAEMA for Orange I dye was investigated under different experimental conditions, such as solution pH, initial dye concentration, contact time and temperature. Under the optimum conditions, the adsorption amount of Bent-PDMAEMA for Orange I dye could reach 700 mg·g−1, indicating the potential application of Bent-PDMAEMA for anionic dyes in the treatment of wastewater. Moreover, the experimental data fitted well with the Langmuir model. The adsorption process obeyed pseudo-second-order kinetic process mechanism.

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Continuous Flow Removal of Anionic Dyes in Water by Chitosan-Functionalized Iron Oxide Nanoparticles Incorporated in a Dextran Gel Column

Nanomaterials ◽

10.3390/nano9081164 ◽

2019 ◽

Vol 9 (8) ◽

pp. 1164 ◽

Cited By ~ 3

Author(s):

Sang Yeob Lee ◽

Ha Eun Shim ◽

Jung Eun Yang ◽

Yong Jun Choi ◽

Jongho Jeon

Keyword(s):

Removal Efficiency ◽

Continuous Flow ◽

Aqueous Media ◽

Dye Adsorption ◽

Current Method ◽

Maximum Adsorption Capacity ◽

Anionic Dyes ◽

Solution Ph ◽

Adsorbent Surface ◽

Equilibrium Data

This paper describes a novel chromatographic method for efficient removal of anionic dyes from aqueous solutions. Chitosan-coated Fe3O4 nanoparticles can easily be immobilized on a dextran gel column. Single elution of Evans Blue (EB) solution to the nanoadsorbent-incorporated columns provides high removal efficiency with a maximum adsorption capacity of 243.9 mg/g. We also investigated the influence of initial concentration and solution pH on the removal efficiency of EB. The electrostatic interaction between the adsorbent surface and negatively charged sulfate groups on EB molecules promotes the efficient adsorption of dyes. The equilibrium data matched well with the Langmuir isotherm model, which indicated monolayer dye adsorption onto the adsorbent surface. To extend the application of the current method, we performed further adsorption experiments using other anionic dyes of different colors (Cy5.5, Acid Yellow 25, Acid Green 25, and Acid Red 1). All of these molecules can efficiently be captured under continuous flow conditions, with higher removal efficiency obtained with more negatively charged dyes. These findings clearly demonstrate that the present approach is a useful method for the removal of anionic dye contaminants in aqueous media by adsorption.

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