1
|
Burts K, Plisko T, Penkova A, Ermakov S, Bildyukevich A. Influence of PEG-PPG-PEG Block Copolymer Concentration and Coagulation Bath Temperature on the Structure Formation of Polyphenylsulfone Membranes. Polymers (Basel) 2024; 16:1349. [PMID: 38794542 PMCID: PMC11124811 DOI: 10.3390/polym16101349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 05/03/2024] [Accepted: 05/07/2024] [Indexed: 05/26/2024] Open
Abstract
The effect of amphiphilic block copolymer polyethylene glycol (PEG)-polypropylene glycol (PPG)-PEG concentration in the polyphenylsulfone (PPSU) casting solution and coagulation bath temperature (CBT) on the structure, separation, and antifouling performance of PPSU ultrafiltration membranes was studied for the first time. According to the phase diagram obtained, PPSU/PEG-PPG-PEG/N-methyl-2-pyrrolidone (NMP) systems are characterized by a narrow miscibility gap. It was found that 20 wt.% PPSU solutions in NMP with the addition of 5-15 wt.% of PEG-PPG-PEG block copolymer feature upper critical solution temperature, gel point, and lower critical solution temperature. Membrane composition and structure were studied by Fourier-transform infrared spectroscopy, scanning electron and atomic force microscopies, and water contact angle measurements. The addition of PEG-PPG-PPG to the PPSU casting solution was found to increase the hydrophilicity of the membrane surface (water contact angle decreased from 78° for the reference PPSU membrane down to 50° for 20 wt.%PPSU/15 wt.% PEG-PPG-PEG membrane). It was revealed that the pure water flux increased with the rise of CBT from 18-20 L·m-2·h-1 for the reference PPSU membrane up to 38-140 L·m-2·h-1 for 20 wt.% PPSU/10-15 wt.% PEG-PPG-PEG membranes. However, the opposite trend was observed for 20 wt.% PPSU/5-7 wt.% PEG-PPG-PEG membranes: pure water flux decreased with an increase in CBT. This is due to the differences in the mechanism of phase separation (non-solvent-induced phase separation (NIPS) or a combination of NIPS and temperature-induced phase separation (TIPS)). It was shown that 20 wt.% PPSU/10 wt.% PEG-PPG-PEG membranes were characterized by significantly higher antifouling performance (FRR-81-89%, DRr-26-32%, DRir-10-20%, DT-33-45%) during the ultrafiltration of bovine serum albumin solutions compared to the reference PPSU membrane prepared at different CBTs (FRR-29-38%, DRr-6-14%, DRir-74-89%, DT-88-94%).
Collapse
Affiliation(s)
- Katsiaryna Burts
- St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia
| | - Tatiana Plisko
- St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia
| | - Anastasia Penkova
- St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia
| | - Sergey Ermakov
- St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia
| | - Alexandr Bildyukevich
- Institute of Physical Organic Chemistry, National Academy of Sciences of Belarus, Surganov Str., 13, 220072 Minsk, Belarus
| |
Collapse
|
2
|
Liu S, Wang J, Liu Y, Yang B, Hong M, Yu S, Qiu G. Degradation of norfloxacin by red mud-based prussian blue activating H 2O 2: A strategy for treating waste with waste. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 269:115794. [PMID: 38061084 DOI: 10.1016/j.ecoenv.2023.115794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 11/30/2023] [Accepted: 12/05/2023] [Indexed: 01/12/2024]
Abstract
The massive accumulation of red mud (RM) and the abuse of antibiotics pose a threat to environment safety and human health. In this study, we synthesized RM-based Prussian blue (RM-PB) by acid solution-coprecipitation method to activate H2O2 to degrade norfloxacin, which reached about 90% degradation efficiency at pH 5 within 60 min and maintained excellent catalytic performance over a wide pH range (3-11). Due to better dispersion and unique pore properties, RM-PB exposed more active sites, thus the RM-PB/H2O2 system produced more reactive oxygen species. As a result, the removal rate of norfloxacin by RM-PB/H2O2 system was 8.58 times and 2.62 times of that by RM/H2O2 system and PB/H2O2 system, respectively. The reactive oxygen species (ROS) produced in the degradation process included ·OH, ·O2- and 1O2, with 1O2 playing a dominant role. The formation and transformation of these ROS was accompanied by the Fe(III)/Fe(II) cycle, which was conducive for the sustained production of ROS. The RM-PB/H2O2 system maintained a higher degradation efficiency after five cycles, and the material exhibited strong stability, with a low iron leaching concentration. Further research showed the degradation process was less affected by Cl-, SO42-, NO3-, and humic acids, but was inhibited by HCO3- and HPO42-. In addition, we also proposed the possible degradation pathway of norfloxacin. This work is expected to improve the resource utilization rate of RM and achieve treating waste with waste.
Collapse
Affiliation(s)
- Shitong Liu
- School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Central South University, Changsha 410083, China
| | - Jun Wang
- School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Central South University, Changsha 410083, China.
| | - Yang Liu
- School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Central South University, Changsha 410083, China.
| | - Baojun Yang
- School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Central South University, Changsha 410083, China
| | - Maoxin Hong
- School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Central South University, Changsha 410083, China
| | - Shichao Yu
- School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Central South University, Changsha 410083, China
| | - Guanzhou Qiu
- School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Central South University, Changsha 410083, China
| |
Collapse
|
3
|
Liu G, Song C, Huang Z, Jin X, Cao K, Chen F, Jin B, Rao L, Huang Q. Ultrasound enhanced destruction of tetracycline hydrochloride with peroxydisulfate oxidation over FeS/NBC catalyst: Governing factors, strengthening mechanism and degradation pathway. CHEMOSPHERE 2023; 338:139418. [PMID: 37414292 DOI: 10.1016/j.chemosphere.2023.139418] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 06/30/2023] [Accepted: 07/03/2023] [Indexed: 07/08/2023]
Abstract
In this study, FeS/N-doped biochar (NBC) derived from the co-pyrolysis of birch sawdust and Mohr's salt was applied to evaluate the efficiency of catalyzed peroxydisulfate (PDS) oxidation for tetracycline (TC) degradation. It is found that the combination of ultrasonic irradiation can distinctly enhance the removal of TC. This study investigated the effects of control factors such as PDS dose, solution pH, ultrasonic power, and frequency on TC degradation. Within the applied ultrasound intensity range, TC degradation increases with increasing frequency and power. However, excessive power can lead to a reduced efficiency. Under the optimized experimental conditions, the observed reaction kinetic constant of TC degradation increased from 0.0251 to 0.0474 min-1, with an increase of 89%. The removal ratio of TC also increased from ∼85% to ∼99% and the mineralization level from 45% to 64% within 90 min. Through the decomposition testing of PDS, reaction stoichiometric efficiency calculation, and electron paramagnetic resonance experiments, it is shown that the increase in TC degradation of the ultrasound-assisted FeS/NBC-PDS system was attributed to the increase in PDS decomposition and utilization, as well as the increase in SO4•- concentration. The radical quenching experiments showed that SO4•-, •OH, and O2•- radicals were the dominant active species in TC degradation. TC degradation pathways were speculated according to intermediates from HPLC-MS analysis. The test of simulated actual samples showed that dissolved organic matter, metal ions, and anions in waters can undercut the TC degradation in FeS/NBC-PDS system, but ultrasound can significantly reduce the negative impact of these factors.
Collapse
Affiliation(s)
- Guangrong Liu
- Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, School of Materials and Energy, Yunnan University, Kunming, 650091, PR China
| | - Chuangfu Song
- Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, School of Materials and Energy, Yunnan University, Kunming, 650091, PR China
| | - Zilin Huang
- Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, School of Materials and Energy, Yunnan University, Kunming, 650091, PR China
| | - Xin Jin
- Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, School of Materials and Energy, Yunnan University, Kunming, 650091, PR China
| | - Kaihong Cao
- Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, School of Materials and Energy, Yunnan University, Kunming, 650091, PR China
| | - Fangyue Chen
- Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, School of Materials and Energy, Yunnan University, Kunming, 650091, PR China
| | - Bangheng Jin
- Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, School of Materials and Energy, Yunnan University, Kunming, 650091, PR China
| | - Li Rao
- Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, School of Materials and Energy, Yunnan University, Kunming, 650091, PR China
| | - Qiang Huang
- Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, School of Materials and Energy, Yunnan University, Kunming, 650091, PR China.
| |
Collapse
|
4
|
Chang D, Mao Y, Qiu W, Wu Y, Cai B. The Source and Distribution of Tetracycline Antibiotics in China: A Review. TOXICS 2023; 11:214. [PMID: 36976979 PMCID: PMC10052762 DOI: 10.3390/toxics11030214] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/22/2023] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
In recent years, antibiotics have been listed as a new class of environmental pollutants. Tetracycline antibiotics (TCs) used in human medical treatment, animal husbandry and agricultural production are the most widely used antibiotics. Due to their wide range of activities and low cost, their annual consumption is increasing. TCs cannot be completely metabolized by humans and animals. They can be abused or overused, causing the continuous accumulation of TCs in the ecological environment and potential negative effects on non-target organisms. These TCs may spread into the food chain and pose a serious threat to human health and the ecology. Based on the Chinese environment, the residues of TCs in feces, sewage, sludge, soil and water were comprehensively summarized, as well as the potential transmission capacity of air. This paper collected the concentrations of TCs in different media in the Chinese environment, contributing to the collection of a TC pollutant database in China, and facilitating the monitoring and treatment of pollutants in the future.
Collapse
|
5
|
Zhang J, Li G, Yuan X, Li P, Yu Y, Yang W, Zhao S. Reduction of Ultrafiltration Membrane Fouling by the Pretreatment Removal of Emerging Pollutants: A Review. MEMBRANES 2023; 13:membranes13010077. [PMID: 36676884 PMCID: PMC9862110 DOI: 10.3390/membranes13010077] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/24/2022] [Accepted: 01/06/2023] [Indexed: 05/28/2023]
Abstract
Ultrafiltration (UF) processes exhibit high removal efficiencies for suspended solids and organic macromolecules, while UF membrane fouling is the biggest obstacle affecting the wide application of UF technology. To solve this problem, various pretreatment measures, including coagulation, adsorption, and advanced oxidation, for application prior to UF processes have been proposed and applied in actual water treatment processes. Previously, researchers mainly focused on the contribution of natural macromolecular pollutants to UF membrane fouling, while the mechanisms of the influence of emerging pollutants (EPs) in UF processes (such as antibiotics, microplastics, antibiotic resistance genes, etc.) on membrane fouling still need to be determined. This review introduces the removal efficiency and separation mechanism for EPs for pretreatments combined with UF membrane separation technology and evaluates the degree of membrane fouling based on the UF membrane's materials/pores and the structural characteristics of the cake layer. This paper shows that the current membrane separation process should be actively developed with the aim of overcoming specific problems in order to meet the technical requirements for the efficient separation of EPs.
Collapse
Affiliation(s)
- Jianguo Zhang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Gaotian Li
- School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
| | - Xingcheng Yuan
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Panpan Li
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Yongfa Yu
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Weihua Yang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Shuang Zhao
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| |
Collapse
|
6
|
Li Y, Pan G, Zhang Y, Wang J, Yu H, Zhao G, Zhao M, Tang G, Guo Y, Wu C, Liu Y. A new method for tailoring the surface pore size and internal pore structure of ultrafiltration membranes without using additives—Atomization-assisted nonsolvent induced phase separation method. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122334] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
|
7
|
Anbarasan R, Thamizhlarasan A, Liu YC, Tung KL. Synthesis, characterization, catalytic reduction of Eosin B dye and C, N cross coupling reactions of sodiumalginate/V2O5 nanocomposite. J Taiwan Inst Chem Eng 2023. [DOI: 10.1016/j.jtice.2022.104613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
|
8
|
Liu L, Liu Y, Chen X, Feng S, Wan Y, Lu H, Luo J. A nanofiltration membrane with outstanding antifouling ability: Exploring the structure-property-performance relationship. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.121205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
9
|
Wu LK, Zhu QY, Li LQ, Xu ZL, Xue SM, Ji CH, Tang CY, Zhuang L, Tang YJ. Exploration of Permeation Resistance Change of the Polyamide Nanofiltration Membrane during Heat Curing by Using Organic Molecules as Functional Fillers. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Liu-Kun Wu
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai200237, China
| | - Qiu-Yu Zhu
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai200237, China
| | - Lan-Qian Li
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai200237, China
| | - Zhen-Liang Xu
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai200237, China
| | - Shuang-Mei Xue
- Institute for Advanced Study, Shenzhen University, Shenzhen518060, China
| | - Chen-Hao Ji
- Institute for Advanced Study, Shenzhen University, Shenzhen518060, China
| | - Chuyang Y. Tang
- Department of Civil Engineering, The University of Hong Kong, PokfulamHW619B, Hong Kong, China
| | - Liwei Zhuang
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai200237, China
| | - Yong-Jian Tang
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai200237, China
| |
Collapse
|
10
|
Organic solvent permeation characteristics of TiO2-ZrO2 composite nanofiltration membranes prepared using organic chelating ligand to control pore size and surface property. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
11
|
Aljanabi AAA, Mousa NE, Aljumaily MM, Majdi HS, Yahya AA, AL-Baiati MN, Hashim N, Rashid KT, Al-Saadi S, Alsalhy QF. Modification of Polyethersulfone Ultrafiltration Membrane Using Poly(terephthalic acid-co-glycerol-g-maleic anhydride) as Novel Pore Former. Polymers (Basel) 2022; 14:polym14163408. [PMID: 36015666 PMCID: PMC9414477 DOI: 10.3390/polym14163408] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/12/2022] [Accepted: 08/17/2022] [Indexed: 11/16/2022] Open
Abstract
In this research, poly terephthalic acid-co-glycerol-g-maleic anhydride (PTGM) graft co-polymer was used as novel water-soluble pore formers for polyethersulfone (PES) membrane modification. The modified PES membranes were characterized to monitor the effect of PTGM content on their pure water flux, hydrophilicity, porosity, morphological structure, composition, and performance. PTGM and PES/PTGM membranes were characterized by field emission scanning electron microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR), and contact angle (CA). The results revealed that the porosity and hydrophilicity of the fabricated membrane formed using a 5 wt.% PTGM ratio exhibited an enhancement of 20% and 18%, respectively. Similarly, upon raising the PTGM ratio in the casting solution, a more porous with longer finger-like structure was observed. However, at optimum PTGM content (i.e., 5%), apparent enhancements in the water flux, bovine serum albumin (BSA), and sodium alginate (SA) retention were noticed by values of 203 L/m2.h (LMH), 94, and 96%, respectively. These results illustrated that the observed separation and permeation trend of the PES/PTGM membrane may be a suitable option for applications of wastewater treatment. The experimental results suggest the promising potential of PTGM as a pore former on the membrane properties and performance.
Collapse
Affiliation(s)
- Ali A. Abbas Aljanabi
- Al-Mussaib Technical College, Al-Furat Al-Awsat Technical University, Babylon 51009, Iraq
| | - Noor Edin Mousa
- Membrane Technology Research Unit, Chemical Engineering Department, University of Technology-Iraq, Alsena’a Street No. 52, B. O. 35010, Baghdad 10066, Iraq
| | - Mustafa M. Aljumaily
- Department of Civil Engineering, Al-Maarif University College, Al-Ramadi 31001, Iraq
| | - Hasan Sh. Majdi
- Department of Chemical Engineering and Petroleum Industries, Al-Mustaqbal University College, Babylon 51001, Iraq
| | - Ali Amer Yahya
- Membrane Technology Research Unit, Chemical Engineering Department, University of Technology-Iraq, Alsena’a Street No. 52, B. O. 35010, Baghdad 10066, Iraq
| | - Mohammad N. AL-Baiati
- Department of Chemistry, College of Education for Pure Sciences, University of Kerbala, Holly Kerbala 56001, Iraq
| | - Noor Hashim
- Membrane Technology Research Unit, Chemical Engineering Department, University of Technology-Iraq, Alsena’a Street No. 52, B. O. 35010, Baghdad 10066, Iraq
| | - Khaild T. Rashid
- Membrane Technology Research Unit, Chemical Engineering Department, University of Technology-Iraq, Alsena’a Street No. 52, B. O. 35010, Baghdad 10066, Iraq
| | - Saad Al-Saadi
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
- Correspondence: (S.A.-S.); (Q.F.A.)
| | - Qusay F. Alsalhy
- Membrane Technology Research Unit, Chemical Engineering Department, University of Technology-Iraq, Alsena’a Street No. 52, B. O. 35010, Baghdad 10066, Iraq
- Correspondence: (S.A.-S.); (Q.F.A.)
| |
Collapse
|
12
|
Wang L, Tao Y, Wang J, Tian M, Liu S, Quan T, Yang L, Wang D, Li X, Gao D. A novel hydroxyl-riched covalent organic framework as an advanced adsorbent for the adsorption of anionic azo dyes. Anal Chim Acta 2022; 1227:340329. [DOI: 10.1016/j.aca.2022.340329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 08/22/2022] [Accepted: 08/24/2022] [Indexed: 11/26/2022]
|
13
|
Development of High Flux Nanocomposite Polyphenylsulfone/Oxidized Multiwalled Carbon Nanotubes Membranes for Ultrafiltration Using the Systems with Critical Solution Temperatures. MEMBRANES 2022; 12:membranes12080724. [PMID: 35893442 PMCID: PMC9330833 DOI: 10.3390/membranes12080724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 07/18/2022] [Accepted: 07/18/2022] [Indexed: 11/18/2022]
Abstract
The study deals with the investigation of the effect of the modification of polyphenylsulfone (PPSU) flat sheet membranes for ultrafiltration using oxidized multiwalled carbon nanotubes (O-MWCNT) in order to enhance membrane permeability and antifouling performance. The effect of O-MWCNT loading to the PPSU-polyethylene glycol (PEG-20,000, Mn = 20,000 g·mol−1)-polyvinylpyrrolidone (PVP K-30, Mn = 40,000 g·mol−1)-N-methy-2-pyrrolidinone (NMP) colloid systems on the phase state and viscosity was studied. It was found that PPSU-PEG-20,000-PVP K-30-O-MWCNT-NMP colloid systems feature a gel point (T = 35–37 °C) and demixing temperature (T = 127–129 °C) at which two bulk phases are formed and a polymer system delaminates. According to the study of the phase state and viscosity of these colloid systems, a method for the preparation of high flux PPSU membranes is proposed which includes processing of the casting solution at the temperature higher than gel point (40 °C) and using a coagulation bath temperature lower than gel point (25 °C) or lower than demixing temperature (40 °C and 70 °C). Membrane structure, topology and hydrophilic-hydrophobic balance were investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM) and water contact angle measurements. The effect of coagulation bath temperature and O-MWCNT concentration on the membrane separation and antifouling performance in ultrafiltration of human serum albumin and humic acids solutions was studied. It was found that the modification of PPSU ultrafiltration membranes by O-MWCNTs yielded the formation of a thinner selective layer and hydrophilization of the membrane surface (water contact angle decreased from 53–56° for the reference PPSU membrane down to 33° for the nanocomposite membrane with the addition of 0.19 wt.% O-MWCNT). These changes resulted in the increase in membrane flux (from 203–605 L·m−2·h−1 at transmembrane pressure of 0.1 MPa for the reference membrane up to 512–983 L·m−2·h−1 for nanocomposite membrane with the addition of 0.19 wt.% O-MWCNT depending on coagulation bath temperature) which significantly surpasses the performance of PPSU ultrafiltration membranes reported to date while maintaining a high level of human serum albumin rejection (83–92%). It was revealed that nanocomposite membrane demonstrated better antifouling performance (the flux recovery ratio increased from 47% for the reference PPSU membrane up to 62% for the nanocomposite membrane) and higher total organic carbon removal compared to the reference PPSU membrane in humic acids solution ultrafiltration.
Collapse
|