Article
Chemistry, Multidisciplinary
Asima Siddiqa, Abdul Majid, Farhat Saira, Saima Farooq, Rumana Qureshi, Sara Qaisar
Summary: In this study, composite membranes of polyaniline/polyvinylidene fluoride (PANI/PVDF) blended with nanodiamond (ND) were fabricated to improve their antifouling properties. Characterization analysis showed that the addition of ND maintained the integrity and porosity of the composite membranes. The composite membranes exhibited high solvent content ratio, low shrinkage ratio, and excellent separation performance for copper and zinc ions, making them promising for industrial and municipal wastewater treatment.
Article
Environmental Sciences
Vahid Vatanpour, Maryam Jouyandeh, Hossein Akhi, Seyed Soroush Mousavi Khadem, Mohammad Reza Ganjali, Hiresh Moradi, Somayeh Mirsadeghi, Alireza Badiei, Amin Esmaeili, Navid Rabiee, Sajjad Habibzadeh, Ismail Koyuncu, Sasan Nouranian, Krzysztof Formela, Mohammad Reza Saeb
Summary: In this study, PEI-SiO2/PSF nanocomposite membranes were prepared using nonsolvent-induced phase separation. The results showed that PEI-SiO2 nanoparticles were uniformly dispersed in the PSF-based membranes, leading to a decrease in water contact angle and improvements in fouling resistance and permeability.
Article
Engineering, Chemical
Amos Taiswa, Jessica M. Andriolo, Katie Hailer, Jack L. Skinner
Summary: The use of anti-quorum sensing molecules in water filtration membranes can effectively reduce biofilm formation, thereby improving filtration efficiency and clean water production.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Polymer Science
Daniela P. F. Bonfim, Fabiana G. S. Cruz, Rosario E. S. Bretas, Vadila G. Guerra, Monica Lopes Aguiar
Summary: This research aims to develop electrospun microfiber membranes from PET wastes and evaluate their use as an air filter media. The membranes showed high mechanical resistance, adequate permeability, high porosity, high collection efficiency, and low-pressure drop for the removal of viable aerosol nanoparticles, making them suitable for indoor air filters in environments with strict cleanliness requirements.
Article
Engineering, Environmental
Hifza Nawaz, Muhammad Umar, Iqra Nawaz, Qasim Zia, Madeeha Tabassum, Humaira Razzaq, Hugh Gong, Xiubo Zhao, Xuqing Liu
Summary: The PVDF-PANI-TNT nanocomposite membranes were synthesized through phase inversion method and characterized by various analytical techniques, showing excellent photocatalytic activity and pollutant removal efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
R. Bai, H. Shao, H. Wang, X. Ding, W. Wang, X. Jin, W. Yang, T. Lin
Summary: This study explores various aspects of electrospun PVDF nanofibers in terms of mechanical-to-electrical energy conversion. The effects of voltmeter resistance and testing modes on electrical characterizations are examined. The study also investigates the source of electrical generation, force response, and roles of each electrode. The findings reveal the impact of voltmeter resistance on measurements and the contribution of different energy conversion principles to voltage outputs under different testing modes. The study highlights the importance of evaluating mechanoelectrical nanofibers and developing high-performance energy harvesters.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Engineering, Chemical
Yanan Li, Zhihai Liu, Shuming Li, Pei Nian, Nan Xu, Haiyu Luo, Yibin Wei
Summary: A novel MXene-based NF membrane with high water permeability and stability was developed by intercalating Ag nanoparticles into the laminar structure of Ti(3)C(2)Tx MXene with HPEI crosslinking. The prepared HPEI-AgNP@Ti(3)C(2)Tx MXene membrane exhibited competitive water permeabilities and nearly 100% rejections for various dyes and excellent NF performance for salts. The NF separation mechanisms were elucidated based on the unique physicochemical structure of the HPEI-AgNP@Ti(3)C(2)Tx MXene membrane.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Peng Ge, Zhen Lin, Jiarui Yang, Chuan Hu, Qinglin Liu, Qiugen Zhang
Summary: This article presents a facile strategy to fabricate polyethylenimine-grafted polyethersulfone hollow fiber membranes (PSF-PEI HFMs) for efficient dye separation. Unlike traditional interfacial polymerization, these HFMs were directly prepared via quaternization of PEI with brominated polyethersulfone UF HFMs. The PSF-PEI HFMs exhibit ultra-high water permeance and outstanding rejection for dyes, while maintaining low rejections for inorganic salts. Additionally, they show excellent stability and antifouling abilities, making them highly promising for industrial applications in fast dye separation.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Siying Wu, Fatemeh Zabihi, Rou Yi Yeap, Mohammad Reza Yousefi Darestani, Addie Bahi, Zeyu Wan, Shengyuan Yang, Peyman Servati, Frank K. Ko
Summary: Piezoelectric nanogenerators (PENGs) convert mechanical energy from body movement to electricity. Flexible piezoelectric yarns assembled with cesium lead halide perovskite decorated polyvinylidene fluoride (PVDF) nanofibers offer a comfortable and efficient solution for wearable energy harvesting. Optimal performance was achieved with CsPbI2Br decorated PVDF nanofibers, producing an output voltage of 8.3 V and current of 1.91 mu A, and maintaining performance after 19,200 cycles of mechanical stresses. The flexibility of piezoelectric yarns enables various textile integrations, demonstrating the potential for wearable mechanical energy harvesting.
Article
Nanoscience & Nanotechnology
Gunawan Setia Prihandana, Tutik Sriani, Muslim Mahardika
Summary: This paper elaborated on the fabrication process of nanofiltration PVDF membrane incorporating various quantities of hydrophilic polyvinylpyrrolidone (PVP) and hydroxyapatite (HA) using a wet phase inversion method to improve its hydrophilicity. The PVDF/PVP/HA-blended membrane showed the highest water permeability, water content, and surface energy when 2 wt.% of PVP was introduced into the base polymer PVDF. This fabricated membrane, labeled as PVP 2.0, also showed the lowest contact angle and the highest surface porosity.
RECENT PATENTS ON NANOTECHNOLOGY
(2023)
Article
Engineering, Chemical
Xuhui Hu, Xing Chen, Mattia Giagnorio, Chunhong Wu, Yunbai Luo, Claus Helix-Nielsen, Ping Yu, Wenjing Zhang
Summary: A new class of PVDF-based membranes suitable for membrane distillation was prepared via electrospinning. By tuning the solvent ratio and operating parameters, the classical fiber morphology of PVDF electrospun membranes was changed to generate a beaded structure. Increasing the bead density improved the water contact angle and reduced the membrane thickness, but decreased the membrane mechanical stability. Simultaneous deployment of 17 and 25 wt% of PVDF solutions in a double-needle electrospinning device enabled the fabrication of electrospun PVDF-beaded membranes with high hydrophobicity, low thickness, and good mechanical stability for membrane distillation.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Juanjuan Wen, Yishan Chen, Qiang Yan, Ling Jiang, Xianfu Chen, Yiqun Fan
Summary: Ceramic nanofiltration (NF) membranes are efficient for purifying high-quality fructooligosaccharides (FOS), and the screening process should consider retention rate, yield, purity, membrane flux, and washing water volume. The concentration of FOS feed should be controlled within 100 g/L, and the suggested settings for transmembrane pressure, cross-flow velocity, and operating temperature are 0.7 MPa, 1.2 m/s, and 60 ℃, respectively. High separation factor and low non-prebiotic sugar rejection rate of the ceramic NF membrane can achieve high FOS yield and purity with less leachate addition. Moreover, the ceramic NF membrane maintains stable separation performance and can recover pure water flux after cleaning, showing promising application prospects in the FOS purification industry.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Polymer Science
Mohamed Magdi Ahmed, Jakub Hruza, Martin Stuchlik, Vojtech Antos, Jana Mullerova, Michal Rezanka
Summary: The study proposes a new mechanism for the PVDF alkaline reaction and indicates the influence of IPA on the reaction. Sodium isopropylalcoholate catalyzes the bond cleavage and formation in the reaction, which is of significant importance for PVDF nanofiber synthesis.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Biotechnology & Applied Microbiology
Xuemei Ge, Shang Wu, Wen Shen, Lijuan Chen, Yan Zheng, Fen Ao, Yuanlan Ning, Yueyang Mao, Zhong Chen
Summary: In this study, gold nanoparticles and curcumin drug were incorporated into PVDF nanofibers using electrospinning. The morphological and drug release properties were characterized, and it was found that the addition of gold nanoparticles improved and prolonged the drug release. These results suggest the potential application of PVDF-AuNPs nanofiber membrane in nerve regeneration.
BIOENGINEERING-BASEL
(2022)
Article
Engineering, Chemical
Patricia Marin Sam Roman, Kitty P. Nijmeijer, Rint Sijbesma
Summary: New isoporous nanofiltration composite membranes with high permeability and size-charge selectivity rejection were fabricated by photo-polymerization.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Environmental Sciences
Moon-Yeong Choi, Chang-Gu Lee, Seong-Jik Park
Summary: Venerupis philippinarum shells (VPSs) have high potential as a fluoride adsorbent due to their high Ca content and low processing cost. Calcination of VPSs at different temperatures revealed that those calcined at 800 and 900 degrees C had the highest fluoride adsorption capacity. The increase in calcination temperature resulted in the transformation of CaCO3 to CaO and Ca(OH)2, enhancing the solubility of Ca and allowing for fluoride adsorption.
WATER AIR AND SOIL POLLUTION
(2022)
Article
Engineering, Chemical
Moon-Yeong Choi, Jin-Kyu Kang, Chang-Gu Lee, Seong-Jik Parka
Summary: This study assessed the use of Mactra veneriformis shells as an adsorbent for fluoride removal from water. The shells calcined at 800 and 900 degrees C had the highest adsorption capacity for fluoride. The adsorption process followed the pseudo-second-order and Langmuir models. The optimized conditions for fluoride removal were determined using response surface methodology and artificial neural networks. The Mactra veneriformis shells showed high fluoride removal efficiency under the optimized conditions.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Environmental Sciences
Moon-Yeong Choi, Chang-Gu Lee, Seong-Jik Park
Summary: In this study, aluminum-impregnated kenaf biochar (Al-KNF-300) was found to have the highest fluoride adsorption capacity among different pyrolysis temperatures. The maximum fluoride adsorption capacity of Al-KNF-300 was 13.93 mg/g according to the Langmuir model.
WATER AIR AND SOIL POLLUTION
(2022)
Article
Environmental Sciences
Jude Ofei Quansah, Seung-Hee Hong, Chang-Gu Lee, Seong-Jik Park
Summary: The applicability of oyster and mussel shells as capping materials to inhibit the movement of nitrogen and phosphorous from river sediments was investigated. Oyster and mussel shells, after heat treatment, showed increased nutrient adsorption efficiency. The results of the laboratory incubation experiments suggested that oyster shell capping performed better than mussel shell capping in blocking the release of nitrogen, and adding a layer of sand on top further enhanced the efficiency. On the other hand, mussel shell capping effectively impeded the release of phosphorous. Oyster shell capping with a 3 cm layer of sand (OS/SA3) was recommended as the best capping strategy for inhibiting nitrogen and phosphorous releases from river sediments.
Article
Environmental Sciences
Youn-Jun Lee, Jong-Min Lee, Chang-Gu Lee, Seong-Jik Park, Eun Hea Jho
Summary: This study investigates the effects of different reaction conditions on the photolysis of the agricultural antibiotic oxytetracycline (OTC). The results show that UV-C radiation is the most efficient source for degradation, with higher light intensity leading to increased removal ratio. Lower initial OTC concentration and higher solution temperature are advantageous for degradation, while the presence of humic acid or inorganic ions negatively affects the degradation rate. Additionally, the degradation kinetics of OTC in agricultural water and the photolysis of other antibiotics were further studied.
Article
Environmental Sciences
Sayed Q. Hashimi, Seung-Hee Hong, Chang-Gu Lee, Seong-Jik Park
Summary: Aluminum-impregnated food waste was used as an adsorbent for removing As(III) from aqueous solutions. The optimization of the modification and carbonization conditions was carried out, and the factors affecting the adsorption capacity of the adsorbent were studied. The results showed that Al-FWB is a promising low-cost adsorbent with good performance for adsorbing As(III).
Article
Environmental Sciences
J. -k. Kang, B. N. Pham, C. -g. Lee, S. -j. Park
Summary: This study used different macroalgae as biosorbents to remove heavy metals. Costaria costata showed the best biosorbent activity and had various functional groups in its cell wall structure. The modification of Costaria costata was ineffective in improving its biosorption capacity. The adsorption of heavy metals onto Costaria costata occurred via covalent bonding, and heavy metal removal was enhanced with increasing initial solution pH. Among competing cations, Al3+ had the greatest inhibitory effect. The dried biomass of Costaria costata could potentially eliminate heavy metals from aqueous solutions due to its high efficiency, easy acquisition, low cost, and easy preparation.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
Thanh-Tin Nguyen, Kyunghoon Jang, Namguk Her, Chang Seong Kim, Soo Wan Kim, In S. Kim
Summary: Developing a hemodialysis membrane that effectively removes both small-sized toxins and middle molecules is vital. This study successfully fabricated novel hemodialysis membranes with different inner diameters, demonstrating superior removal efficiency for both small molecules and middle molecules. The spinning conditions had a significant impact on the membrane properties, affecting the clearance of uremic toxins and protein loss/leaking. Overall, the study proposes a promising membrane for hemodialysis application that achieves increased removal of middle molecules while minimizing protein loss and leakage.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Environmental Sciences
Sungmoon Yoon, Kang-Hee Cho, Minsung Kim, Seong-Jik Park, Chang-Gu Lee, Nag-Choul Choi
Summary: In this study, a low-cost functional ceramic membrane (LFCM) based on waste cast iron (WCI) was fabricated and found to efficiently remove selenium from aqueous solutions. The raw WCI exhibited the highest selenium removal capacity among the prepared materials, with a faster and more efficient removal of Se(IV) compared to Se(VI). The synthesized LFCM showed similar selenium removal properties to WCI and could simultaneously remove Se(IV) and turbidity-causing substances through filtration. These findings are valuable for the development of ceramic membranes using industrial byproducts for wastewater treatment.
Article
Environmental Sciences
Seung-Hee Hong, Soonho Hwang, Chang-Gu Lee, Seong-Jik Park
Summary: Aluminum- and iron-impregnated food waste biochar (Al-FWBC and Fe-FWBC) were used to remediate dredged sediments contaminated with arsenic (As). The amendments of Al-FWBC and Fe-FWBC reduced the non-specifically and specifically sorbed fractions of arsenic, and increased the residual fraction. Stabilization/solidification treatment using Al-FWBC and Fe-FWBC effectively reduced the ecological risk of arsenic and other heavy metals in the sediments.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Editorial Material
Chemistry, Multidisciplinary
Chang-Gu Lee, Seong-Jik Park, Eun Hea Jho
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Kang-Hee Cho, Hyun-Soo Kim, Chang-Gu Lee, Seong-Jik Park, Nag-Choul Choi
Summary: This study compared and evaluated the bioleaching properties of indigenous acidophilic bacteria for various sulfide minerals in terms of pH reduction and metal leaching. It was found that the leaching rate and metal concentration differed depending on the mineral content. These findings can contribute to process optimization in bioleaching for metal extraction.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Environmental
Dohee Kwon, Dongho Choi, Sungyup Jung, Wei-Hsin Chen, Yiu Fai Tsang, Seong-Jik Park, In-Hyun Nam, Eilhann E. Kwon
Summary: One of the most prevalent wastes in the ocean is abandoned, lost, and discarded fishing gears (ALDFGs), which poses a potential mortality risk to all marine creatures. Thermal destruction of ALDFGs, using carbon dioxide as a raw material, can effectively break them down into smaller molecules and neutralize toxic chemicals. Experimental evidence showed that CO2 contributed significantly to the conversion of carbon in hydrocarbons into carbon monoxide (CO).
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Eun-Ji Cho, Jin-Kyu Kang, Chang-Gu Lee, Sungjun Bae, Seong-Jik Park
Summary: In this study, Fenton sludge was used as an efficient adsorbent to remove Cd from zinc smelter wastewater. Thermal activation was employed to enhance the Cd adsorption capacity, and the highest adsorption was achieved at 900 degrees C. The use of Fenton sludge, specifically TA-FS-900, could effectively remove Cd from industrial wastewater and comply with environmental standards.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Jae-In Lee, Chuluuntsetseg Jadamba, Soo-Cheul Yoo, Chang-Gu Lee, Seong-Jik Park
Summary: This study explores ways to improve water quality and provide a sustainable supply of phosphorus (P) into soil by circulating the flow of P from water to soil. Bottom ash (BA_CCM), a byproduct of cattle manure combustion, was used to remove P in wastewater. The P-captured BA_CCM was then used as P fertilizer for rice growth.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
