scholarly journals Novel PVDF-PVP Hollow Fiber Membrane Augmented with TiO2 Nanoparticles: Preparation, Characterization and Application for Copper Removal from Leachate

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 399
Author(s):  
Mohammed Umar Abba ◽  
Hasfalina Che Man ◽  
Raba’ah Syahidah Azis ◽  
Aida Isma Idris ◽  
Muhammad Hazwan Hamzah ◽  
...  
Keyword(s):  
Contact Angle ◽  
Adsorption Capacity ◽  
Tio2 Nanoparticles ◽  
Polyvinylidene Fluoride ◽  
Negative Impact ◽  
Hollow Fiber Membrane ◽  
Copper Removal ◽  
Fiber Membrane ◽  
Copper Adsorption ◽  
Phase Inversion Technique

High proportion of copper has become a global challenge owing to its negative impact on the environment and public health complications. The present study focuses on the fabrication of a polyvinylidene fluoride (PVDF)-polyvinyl pyrrolidone (PVP) fiber membrane incorporated with varying loading (0, 0.5, 1.0, 1.5, and 2.0 wt%) of titanium dioxide (TiO2) nanoparticles via phase inversion technique to achieve hydrophilicity along with high selectivity for copper removal. The developed fibers were characterized based on scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), permeability, porosity, zeta potential, and contact angle. The improved membrane (with 1.0 wt% TiO2) concentration recorded the maximum flux (223 L/m2·h) and copper rejection (98.18%). Similarly, 1.0 wt% concentration of TiO2 nanoparticles made the membrane matrix more hydrophilic with the least contact angle of 50.01°. The maximum copper adsorption capacity of 69.68 mg/g was attained at 1.0 wt% TiO2 concentration. The experimental data of adsorption capacity were best fitted to the Freundlich isotherm model with R2 value of 0.99573. The hybrid membrane developed in this study has considerably eliminated copper from leachate and the concentration of copper in the permeate was substantially reduced to 0.044 mg/L, which is below standard discharge threshold.

Membrane vacuum stripping process for volatile organics removal from water using an asymmetric PVDF (polyvinylidene fluoride) hollow fiber membrane module

2001 ◽  
Vol 1 (5-6) ◽  
pp. 65-75
Author(s):  
D. Wang ◽  
K. Li ◽  
W.K. Teo
Keyword(s):  
Hollow Fiber ◽  
Polyvinylidene Fluoride ◽  
Hollow Fiber Membrane ◽  
Membrane Module ◽  
Solution Temperature ◽  
Permeation Flux ◽  
Fiber Membrane ◽  
Feed Concentration ◽  
Water Permeation ◽  
Phase Inversion Technique

The vacuum membrane stripping process (VMS) for removing a VOC (trichloroethylene) from water was studied in a polyvinylidene fluoride (PVDF) hollow fiber membrane module containing 187 fibers with a length of 0.59 m. The porous PVDF asymmetric hollow fiber used was prepared by the wet phase inversion technique. The feed solution containing trichloroethylene (TCE) was passed through the lumen of the PVDF hollow fiber. Vapors of TCE and water were transported through the pores of the membrane into the shell side maintained at a sub-atmospheric pressure, and condensed in cold traps. The effects of down-stream pressure, solution temperature, feed concentration, and feed flow rate on TCE removal, TCE permeation flux, water permeation flux and TCE concentration of the permeated solution, as well as the mass transfer coefficient were investigated. The down stream pressure and solution temperature were identified as the major factors to control VOC removal and TCE concentration in the permeate stream. A small amount of the permeated solution with higher TCE concentration was obtained at the temperature of 50°C and pressure of 80 mmHg when about 90% TCE was removed from the water.

Postsynthetic functionalization of water stable zirconium metal organic frameworks for high performance copper removal

The Analyst ◽  
2019 ◽  
Vol 144 (15) ◽  
pp. 4552-4558 ◽  
Author(s):  
Yao Xie ◽  
Guiqin Ye ◽  
Suping Peng ◽  
Shiyuan Jiang ◽  
Yang Wang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
High Performance ◽  
Metal Organic Frameworks ◽  
Copper Removal ◽  
Copper Adsorption ◽  
Metal Organic ◽  
Enhanced Adsorption ◽  
Zirconium Metal

Thiol functionalized water stable zirconium MOFs were synthesized and used for copper adsorption with enhanced adsorption capacity and stability.

Lake Water Treatment Using Polyurethane-Polyvinylidene Fluoride Hollow Fiber Blend Membrane and Polyvinylidene Fluoride Hollow Fiber Membrane in a Coagulation-Microfiltration Process

2012 ◽  
Vol 518-523 ◽  
pp. 755-759
Author(s):  
Liang Wang ◽  
Bin Zhao ◽  
Shu Ling Ma ◽  
Hong Wei Zhang ◽  
Qin Yang
Keyword(s):  
Hollow Fiber ◽  
Lake Water ◽  
Polyvinylidene Fluoride ◽  
Hollow Fiber Membrane ◽  
Pollutant Removal ◽  
Transmembrane Pressure ◽  
Permeate Flux ◽  
Fiber Membrane ◽  
Blend Membrane ◽  
Ring Structures

Polyurethane-polyvinylidene fluoride (PU-PVDF) hollow fiber blend membrane prepared by melting, spinning and drawing processes was used to treat lake water in a submerged coagulation-microfiltration (SCMF) process. This novel membrane is characterized by its elastic pore size increase with the pressure increase; therefore, the backwashing step could effectively remove the depositions stuck in membrane pores. Compared to the system using polyvinylidene fluoride (PVDF) hollow fiber membrane, the membrane anti-fouling ability was stronger in the system using PU-PVDF blend membrane, and the transmembrane pressure increased more slowly at a fixed permeate flux. Organic matters were removed comparably for both membranes during the first 3 h treatment, but those with benzene ring structures were susceptibly restricted by PU-PVDF blend membrane as the filtration went on. The turbidity removal was stable in the PU-PVDF system with an average of 97%, and was slightly higher than that in the PVDF system. The outstanding anti-fouling ability and excellent pollutant removal performance make the PU-PVDF hollow fiber blend membrane a better candidate for the SCMF process.

scholarly journals Hg selective adsorption on polypropylene-based hollow fiber grafted with polyacrylamide

2017 ◽  
Vol 36 (1-2) ◽  
pp. 287-299 ◽  
Author(s):  
Changkun Liu ◽  
Jizhen Jia ◽  
Ji’an Liu ◽  
Xiaoyan Liang
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Hollow Fiber ◽  
Heavy Metal Ions ◽  
Hollow Fiber Membrane ◽  
Selective Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Fiber Membrane

A novel polypropylene hollow fiber membrane with a new function of selective adsorption of mercury ions in aqueous solutions was successfully prepared. The surface of the polypropylene hollow fiber membrane was initially modified with polydopamine by surface polymerization, and subsequently grafted with polyacrylamide (PAM) polymer brush via the surface initiated atom transfer radical polymerization (SI-ATRP) technique (thereafter named as PP-PAM). This study investigated the adsorption performance of Hg(II) ions by PP-PAM and the effect of various influencing factors on Hg(II) ion adsorption. The experiment indicated that the Hg(II) adsorption capacity of the PP-PAM increased with the increase of the pH, and the Hg(II) adsorption kinetics was consistent with the pseudo-second-order kinetic model. The adsorption isotherm followed the Langmuir model, with the maximum adsorption capacity calculated to be 0.854 mmol/g for Hg(II) ions. The adsorption study in multi-component system indicated that PP-PAM preferentially adsorbs Hg(II) over Pb(II) ions, with significant adsorption capacity difference of the two heavy metal ions. This study provided an efficient method for the preparation of the adsorptive polypropylene hollow fiber membrane, which expands its application for the selective removal of heavy metal ions.

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