Article
Chemistry, Physical
Han Yan, Xiaorong Yu, Guofeng Dong, Zicheng Zhang, Kangle Ding, Huan Yang, Gaoshen Su
Summary: In this study, a magnetic nanometer demulsifier Fe3O4 @PEI@ 8-CD with high interfacial activity was synthesized, which can efficiently separate oil from oily wastewater in a wide pH range at room temperature. The demulsifier also showed good recyclability and environmental friendliness.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Engineering, Chemical
Xiujun Wang, Jian Zhang, Bo Huang, Ming Duan
Summary: This study designed and prepared a novel degradable cationic clarifier for treating oily wastewater produced from polymer flooding. The clarifier showed excellent flocculant performance and good degradability, which could effectively eliminate polymer-contained oily sludge.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
S. Yu, M. Feng, H. Liu, S. Liu, J. Fu
Summary: A novel PZS-PEI adsorbent was developed for efficient uptake of anionic dyes from aqueous solution, showing good adsorption selectivity and high maximum adsorption capacities. The adsorption process followed a three-stage intraparticle diffusion mode with electrostatic interaction and hydrogen bonding responsible for the highly-efficient adsorption.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Energy & Fuels
Yangang Bi, Wusong Li, Congcong Liu, Zhi Tan, Zhantao Wang, Xiangchen Liu, Guofeng Wang, Xinru Jia
Summary: Two star-shaped quaternary ammonium compounds with melamine as the hydrophobic core showed higher demulsification efficiency in breaking polymer flooding oil-in-water emulsions, potentially due to electrostatic interaction and hydrogen bonding.
Article
Environmental Sciences
Jun Li, Yan Xiong, Xiujun Wang, Fei Wang, Shenwen Fang, Ming Duan
Summary: The preparation of a novel flocculant, PDC12DM, for treating oily wastewater from polymer flooding is a meaningful work. The optimized PDC12DM showed a high oil removal rate and a significant decrease in viscous floc production compared to commercial flocculant, with its mechanism involving electrostatic charge neutralization and demulsification for oil droplet destabilization.
ENVIRONMENTAL TECHNOLOGY
(2021)
Article
Engineering, Environmental
Ketao Yan, Jinfu Chen, Liu He, Weijie Dai
Summary: The study revealed that suspended microcrystalline polymer flooding produced water has unique characteristics in terms of oil droplet diameter distribution, viscosity, and absolute zeta potential. The oil removal rate through gravity sedimentation was found to be higher compared to polymer-flooding produced water and slightly lower than high Ca and Mg polymer flooding produced water. A two-stage composite material filtration combined with gravity sedimentation was proposed as an effective and practical method for oil removal from suspended microcrystalline polymer flooding produced water based on laboratory experiments.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Chemistry, Physical
Shu Yan, Pengfei Jiang, Xinghong Zhang, Yongsheng Guo, Wenjun Fang
Summary: To enhance the extraction efficiency of crude oil emulsions, researchers have designed and synthesized n-hexadecanoyl hyperbranched poly(amido-amine) (CHPAMAM) as an amphiphilic demulsifier with hyperbranched poly(amido-amine) as the core and palmitic acid chains as the shell. Stable oil-in-water emulsions can be completely separated into two phases at low temperature with the presence of highly active CHPAMAM, resulting in a clear phase interface and a thin transition layer. By adding 80 ppm CHPAMAM to simulated emulsions and crude oils from China's oilfields, the oil removal ratios can exceed 99.9% and the water contents in the oil phase can be reduced to less than 0.01%, achieving demulsification equilibrium within 40 min at 30 degrees C. The demulsification process is monitored in real-time using laser scanning confocal microscopy (LSCM). The demulsification mechanism of CHPAMAM is studied through adsorption kinetics experiments and validated by dissipative particle dynamics simulation, demonstrating its ability to disrupt the stabilizing materials and enhance demulsification performance at low temperature.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Environmental Sciences
Francesco Ricceri, Giulio Farinelli, Mattia Giagnorio, Aurora Zamboi, Alberto Tiraferri
Summary: Polymer flooding is an enhanced oil recovery technique used to extract residual oil from conventional extraction methods, but managing produced water with residual HPAM poses challenges due to high viscosity and organic content. Common treatment methods are not efficient, and innovative techniques are not yet practical. A study found that polymer precipitation induced by divalent ions can effectively improve HPAM removal efficiency.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Polymer Science
Rafael E. Hincapie, Ante Borovina, Elisabeth Neubauer, Muhammad Tahir, Samhar Saleh, Vladislav Arekhov, Magdalena Biernat, Torsten Clemens
Summary: This study investigates the wettability alterations through imbibition/flooding and their synergy with interfacial tension (IFT) for alkalis, nanoparticles, and polymers. It demonstrates the influence of the oil total acid number (TAN), chemical agents, and reservoir mineralogy on fluid-fluid and rock-fluid interactions. A laboratory evaluation workflow combining various assessments is used to evaluate wettability alteration, IFT changes, and recovery. The study provides novel data on the synergy of IFT, Amott imbibition, and core floods for the studied chemical processes.
Article
Chemistry, Multidisciplinary
Mohammed Al-Yaari, Tawfik A. Saleh
Summary: Polyethyleneimine-grafted graphene oxide (PEI/GO) was synthesized by using graphene, polyethyleneimine, and trimesoyl chloride. The characterization results confirm the successful synthesis of PEI/GO and its strong interaction with lead (Pb2+) ions. The isotherm study reveals the adsorption process follows the Freundlich isotherm model, with a high maximum adsorption capacity. The prepared PEI/GO adsorbent shows promise for wastewater treatment due to its fast and high uptake removal capacity for Pb2+ ions and other heavy metals.
Article
Chemistry, Physical
Min Zhang, Wanli Kang, Hongbin Yang, Bobo Zhou, Zhe Li, Yingqi He, Korobov Grigory Yurievich, Lekomtsev Alexander Viktorovich
Summary: By using environmentally friendly beta-cyclodextrin as a reverse demulsifier, the dewatering rate of O/W emulsion could be effectively increased. The host-guest inclusion interaction was found to disassemble the network structure of APP4, leading to a significant decrease in structural viscosity and promoting rapid growth of the droplets.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Environmental Sciences
Hongmei Cui, Ling Yin, Xing Huang, Zhongchen Yu, Ziliang Zhang, Zhonghua Dai
Summary: This study proposes an enhanced coagulation model using zeolite as a crystal nucleus to promote flocs. Zeolite is prepared from fly ash by microwave-assisted hydrothermal synthesis and characterized using SEM, XRD, BET analysis. The results show improved surface properties and adsorption capacity of ZFA as a crystal nucleus, leading to higher oil content and SS removal rate compared to conventional coagulation. The optimal conditions for ZFA-enhanced coagulation are identified.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Bowen Hu, Ming Yang, He Huang, Zilin Song, Peng Tao, Yurui Wu, Kewen Tang, Xiaobo Chen, ChangAn Yang
Summary: This paper presents a novel series of TCPEIs adsorbents for efficient and selective recovery of Au(III) ions from aqueous solutions. Among them, TCPEI6 exhibits significantly high adsorption capacity and rate, with an adsorption efficiency of 95.6% within 10 seconds. The excellent adsorption performance is mainly attributed to electrostatic interaction, complexation, and mechanical stability of TCPEIs. TCPEIs can be regenerated within one minute without apparent performance degradation, showing great potential in precious metal ion recovery.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Environmental
Jia-Yi Tang, Yan-Shu Xiong, Ming -Xing Li, Ran Jia, Li-Shu Zhou, Bo-Huan Fan, Kai Li, Wen Li, Hong Li, Hai-Qin Lu
Summary: A hyperbranched polyethyleneimine-functionalised chitosan aerogel (HPCA) was developed as an effective adsorbent for removing hazardous dark-coloured substances from molasses-based distillery wastewater. HPCA demonstrated superior melanoidin adsorption efficiency due to its high specific surface area, abundant amino functional groups, and high hydrophilicity.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Zia Ahmad, Yun Li, Jiajia Yang, Ningbo Geng, Yun Fan, Xiaoyi Gou, Qingye Sun, Jiping Chen
Summary: Novel three-dimensional bifunctional PAO-h-PEI network was synthesized using PEI as the skeleton material, achieving remarkable adsorption capacity and selectivity for uranium extraction. The utilization of amines as the second ligand enhanced uranyl binding and demonstrated good reusability and practicality in extracting low-concentration uranium from real seawater.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Chemical
Yunfei Yu, Xue Yang, Chenchen Zhang, Jie Chen, Wei Lin, Jianqiang Meng
Summary: This study reports an environmentally friendly and simple approach for preparing double-network (DN) ion gel membranes with high strength and excellent gas separation performance. By optimizing crosslinking density, mass ratio, and the type and content of free ionic liquid, the mechanical and gas separation properties of the DN membrane are improved.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Si-qi Jiang, Qiang Gao, Xi-guang Li, Chao-zhu Deng, Jun Qiu, Xiang-nan Zhu
Summary: A dual-strengthening pretreatment method is proposed to remove PVDF more efficiently and enhance the leaching of LiCoO2. Experimental results show that dual-strengthening pretreatment can effectively remove PVDF and significantly improve the leaching efficiency compared to single pretreatment methods.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zengchi Hu, Xiaoyu Wang, Xiaohui Zhang, Xue Li, Jiangbin Xia
Summary: The rapid fabrication of high-performance composite membranes based on CMPs using simple and low-cost methods is challenging. In this study, three CMPs-based composite membranes were rapidly fabricated with adjustable size using unidirectional diffusion synthesis. The microstructural design enhanced the rejection rates of the membranes and they showed strong hydrolytic resistance, thermal stability, and acid-base resistance. Electrostatic adsorption and the adjustable microstructures significantly varied the repellence of the membranes to different charged molecules.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Farzaneh Rouhani, Matineh Ayedi, Nasser Safari
Summary: Introducing defects into porous metal-organic frameworks is important for improving their adsorption performance. Quasi-MOFs, an underutilized variant of large-scale, fundamentally deficient MOFs, have been found to have substantial amounts of unsaturated metal sites to offset the drawbacks of MOFs. In this study, a quasi-MOF was produced using a water-stable MOF and demonstrated significantly improved phosphate adsorption capability due to the presence of defect sites.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Valentin Reungoat, Morad Chadni, Louis M. M. Mouterde, Fanny Brunissen, Florent Allais, Helene Ducatel, Irina Ioannou
Summary: This study focuses on the recovery of sinapic acid using liquid-liquid extraction assisted by a hollow fiber membrane contactor from an aqueous feed obtained through the hydrolysis of mustard bran. The screening of solvents of different chemical nature showed that all tested solvents had an extraction efficiency of more than 80% for pH < 5. Four solvents were selected for use in the hollow fiber membrane contactor, and the volatile solvents showed higher mass transfer coefficients compared to non-volatile solvents. The extraction efficiency was intensified by increasing the initial concentration of sinapic acid and the feed-to-solvent ratio. CPME was found to have optimal recovery efficiency at a phase ratio of 8:1, yielding 0.9 g of sinapic acid per liter of CPME used.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Takahiro Sakamoto, Takafumi Hanada, Hayate Sato, Mayu Kamisono, Masahiro Goto
Summary: The emergence of the battery society has led to a high demand for battery metals, resulting in a strain on their supply. This study introduces a novel technique using a hydrophobic deep eutectic solvent (DES) for leaching and recovering battery metals from low-grade nickel laterite ores. The DES enables selective leaching and recovery of the metals, offering a promising pathway for the extraction of critical battery metals.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Rongrong He, Jiarui Chen, Chunyao Zhang, Dan Lu, Lin Zhang, Tao He
Summary: Researcher has developed a method to quantify the charge density in nanofiltration (NF) membrane separation layer and applied it in NF membranes that can separate Mg2+ and Li+. The results showed that overcompensated amine groups played a major role, and there was a linear relationship between charge density and coating bi-layers or PAH layers.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zhijian Zhang, Min Chen, Zhe Lin, Zhichao Yang, Yafeng Du, Zhihui Chen, Zhenhao Yang, Kongyin Zhao, Ligang Lin
Summary: Membrane technology plays an important role in molecular/ion separation processes, but faces challenges such as membrane fouling. This study introduces a new ion-crosslinking method to fabricate copper alginate hydrogel membranes with improved mechanical strength and antimicrobial capabilities. The membranes exhibit excellent separation performance and enhanced long-term molecule/ion separation through improved anti-swelling properties. Molecular dynamics simulations and life cycle analysis highlight the pore structure and environmental friendliness of the hydrogel membranes. These findings provide valuable insights for developing sustainable hydrogel membranes with stable performance and high separation efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Dongmei Liu, Aiying Guo, Yanling Qi, Zhixin Ji, Hongjuan Li, Zhiwei Zhang, Xinyue Zhang, Kunze Wu, Aijun Cai
Summary: In this study, a stable magnetic Mg/Mn-layered double oxide-doped biochar composite (MgMnLDO-MBC) was prepared and successfully used for the removal of antibiotics and bacteria from wastewater. The composite exhibited enhanced surface areas, adsorption sites, and free radicals, leading to improved catalytic activity. The effects of different factors on the removal efficiency were evaluated, and the composite showed good reusability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Feng Wang, Zhaoyong Bian, Yaru Zhang, Wenchao Yu, Qiang Zhang, Hui Wang
Summary: In this study, a nanofibrous layered structure of Ff-Ti3C2Tx-Co3O4 was prepared by self-assembling nanofibrous Co3O4 with lamellar fluorine-free MXene (Ff-Ti3C2Tx). The Ff-Ti3C2Tx-Co3O4 exhibited excellent catalytic activity for degradation, resistant to ionic interference, and maintained high removal efficiency of sulfamethoxazole (SMX) in municipal wastewater. The rapid SMX degradation involved fast electron transfer in redox cycles with PMS and the generation of 1O2 via PMS ->center dot O2 -> 1O2. This work provides new insights into antibiotic degradation mechanisms and electron transfer based on PMS activation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Weipeng He, Jiacheng Luo, Yujie Wu, Tianhao Luo, Chen Tang
Summary: This study comparatively evaluated the role of cationic, anionic, and nonionic polyacrylamides (PAMs) in ballasted flocculation of clay suspensions under different aluminum sulfate (AS) coagulant dosages. The selection of PAMs and AS dosage had a significant influence on the size and shear resistance of ballasted floc aggregates.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Lixian Wang, Lizhi Zhao, Didi Si, Zhixin Li, Huiqin An, Hui Ye, Qingping Xin, Hong Li, Yuzhong Zhang
Summary: Metalloporphyrin-based nanozymes integrated with poly (vinylidene fluoride) membrane show high catalytic activity and reusability for the decolorization of Congo Red dye in continuous flow process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Yongfei Ma, Chenyu Zeng, Yongzhen Ding, Jiayi Tang, Ondrej Masek, Zhikang Deng, Rui Mu, Zulin Zhang
Summary: In this study, sludge-derived biochar (SBC) was functionalized with various iron salts to enhance its adsorption ability for sulfamethoxazole (SMX) and magnetic collection performance. Ball milling was further employed to treat the optimal iron salt functionalized SBC (MSBC), resulting in ball milled SBC (BMSBC) with improved adsorption performance for SMX. The dominant driving mechanism for SMX adsorption onto BMSBC was confirmed to be multiple physicochemical forces, including 7C-7C conjugation, pore filling, H-bonding, Fe-O complexation, and electrostatic interactions. BMSBC exhibited favorable adsorption ability for SMX in actual waters and could be easily collected within 1 min due to its magnetic sensitivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jinglin Tan, Xiaohui Mao, Wenjihao Hu, Hongbo Zeng
Summary: This study investigates the influence of PDMS chain architectures on surface properties and reveals that PDMS coatings with looped structures exhibit superior hydrophobicity, self-cleaning, and water sliding compared to coatings with linear structures. Additionally, both looped and linear PDMS coated stainless steel mesh/polyester fibers show efficient separation of oil/water mixture.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Wei-Liang Chen, Chih-Chia Cheng, Chien-Hsing Lu, Jem-Kun Chen
Summary: This study designs a novel sandwich-structured capacitor that reduces the absorption time of pollutants using dielectrophoresis force. By coating graphene oxide on polystyrene microspheres as adsorbents and encapsulating them within the capacitor, the adsorption rate is significantly enhanced. Additionally, frequency manipulation allows for the recycling of adsorbents and concentration of dyes, minimizing secondary pollution.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)