Article
Engineering, Chemical
Lingtao Zhu, Mingming Zhang, Jingfeng He, Chengguo Liu, Yake Yao, Jiang Xu, Bin Liu, Sipeng Yin, Xuan Xu
Summary: The study successfully utilized a vibrated gas-solid fluidized bed to recover the metallic fraction of waste printed circuit boards (WPCBs), achieving high separation and recovery efficiency by adjusting operational conditions such as vibration frequency and amplitude.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Engineering, Chemical
Lingtao Zhu, Jingfeng He, Xin Zhang, Bin Yang, Hao Chen, Linghua Chen, Yake Yao
Summary: The influence of fine particles on the separation of waste printed circuit boards by vibrated fluidized bed was investigated in this study. The results showed that an increase in fine particles significantly reduced the metal recovery. The stability of the bed and the separation performance were negatively affected by the adhesion behavior of fine particles. However, pre-removal of iron and aluminum proved to be effective in improving the separation performance and increasing the metal recovery.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Qiang Guo, Christopher Spitler, Jagan Mohan Sanghishetty, Christopher M. Boyce
Summary: This article reviews the hydrodynamics of vibrated gas-fluidized beds (VGFBs) and their applications in improving particle fluidization quality, controlling particle segregation and mixing, and enhancing heat and mass transfer. The recent progress in creating structured flow patterns in VGFBs and developing numerical modeling methods for vibration in VGFBs is discussed. Finally, future research areas for VGFBs are provided.
CURRENT OPINION IN CHEMICAL ENGINEERING
(2023)
Article
Polymer Science
Aung Kyaw Moe, Jirasuta Chungprempree, Jitima Preechawong, Pornsri Sapsrithong, Manit Nithitanakul
Summary: The utilization of non-metallic printed circuit boards (NMPCBs) from waste printed circuit boards as a filler in PVC composites was studied to reduce environmental threats. Treated NMPCBs blended with PVC showed improved tensile modulus, thermal stability, and interfacial adhesion. The incorporation of 1 wt.% of GPTMS successfully modified the NMPCBs and enhanced the dispersion and interfacial adhesion in the PVC matrix.
Review
Green & Sustainable Science & Technology
Ruijun Qiu, Mi Lin, Baojia Qin, Zhenming Xu, Jujun Ruan
Summary: The review focuses on the recent developments in recycling techniques for nonmetallic components in waste printed circuit boards, highlighting the importance of clean production, recycling efficiency, and economic value. The key to future development lies in removing harmful elements, enhancing environmental friendliness and value, and realizing valued-added preparation of materials through combined processes. The results are expected to guide future recycling processes and provide references for industrial development.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Chunyu Li, Chengfei Liu, Hongying Xia, Libo Zhang, Dafang Liu, Bo Shu
Summary: The recycling of waste printed circuit boards (WPCBs) is challenging due to their complex composition and hazardous components. This study proposes a green, efficient, and pollution-free recycling process using alkaline metal oxide catalytic pyrolysis for WPCB recovery, enabling the recovery of bromine and reducing the organic bromine content.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Havva Hande Cebeci, Ibrahim Yilmaz, Oender Yargi, Korkut Acikalin, Ali Gelir, Aysel Kanturk Figen
Summary: Upcycling of electronic waste into metal contented pyrolytic carbon (C-WPCB) was achieved through simple pyrolysis, and the obtained C-WPCB was utilized for supercapacitor electrode preparation. The electrode prepared in 1.5 M H2SO4 solution showed the best performance with specific capacitance, specific power, and specific energy of 39.5 F/g, 25.0 kW/kg, and 16.5 Wh/kg at 5 A/g, respectively.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Construction & Building Technology
Yongjun Meng, Chunyu Zhang, Zhirong Liu, Lishan Ling, Jiechao Lei, Guipeng Fang, Xiaowan Luo
Summary: This paper investigates the impact of waste printed circuit boards (PCB) on the aging property of modified asphalt. The results show that the incorporation of PCB improves the aging resistance and deformation resistance of the asphalt.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Enhui Zhou, Yadong Shan, Linhai Li, Fanshun Shen, Enkhsaruul Byambajav, Bo Zhang, Changxing Shi
Summary: The study investigates the transfer process of vibration energy in a fluidized bed, and the introduction of vibration energy forms a vibrated dense medium fluidized bed with uniform and stable bed density, which can suppress bubble merger, enhance gas-solid contact, and improve fluidization quality. The optimal separation bed height area of VDMFB is approximately H=40-150mm, and vibration energy significantly improves the fluidization quality of ADMFB and the separation effect of fine coal.
Article
Engineering, Chemical
Jun Oshitani, Masaki Hino, Shinichiro Oshiro, Yoshihide Mawatari, Takuya Tsuji, Zhaohua Jiang, George V. Franks
Summary: This study investigates the behavior of different-density particles in a vertically vibrated fluidized bed at various air velocities. It is found that reverse segregation converts to normal segregation at a certain air velocity, which is close to the minimum fluidization velocity of the lighter particles.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Weifeng Liu, Xiaoli Hu, Rui Jia, Duchao Zhang, Lin Chen, Tianzu Yang
Summary: This study proposed a two-stage leaching process to remove impurity metals from copper powder of waste printed circuit boards (WPCBs) and successfully achieved the separation and recovery of valuable metal resources.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Baojia Qin, Mi Lin, Xi Chen, Zhenming Xu, Yonggao Fu, Jiaqi Hu, Jujun Ruan
Summary: This study coupled ball-milling energy with the degradation energy of pentabromodiphenyl ether molecule to determine the time needed for each chemical bond to break, providing a novel approach for debromination time of nonmetallic particles.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Polymer Science
Man Wu, Jingxia Jiang, Cuiping Meng, Xiude Hu, Henglai Xie, Mingzhou Wu, Qingjie Guo
Summary: Nonmetallic materials recycled from waste printed circuit boards were modified by coating KH-550 in a spout-fluid bed with PP particles to enhance fluidization quality. The modified N-WPCBs used as fillers in PP/N-WPCB composites showed improved mechanical properties, with the best modification effect achieved through spout-fluid bed coating with PP particles.
Article
Engineering, Chemical
Surya Kanta Das, G. Ellamparuthy, Tonmoy Kundu, Malay K. Ghosh, Shivakumar Angadi
Summary: The use of surfactants in the flotation of printed circuit boards can influence the recovery of metallic particles, with the addition of collector and frother leading to decreased metal recovery to non-froth products. Frother is essential for stability of the froth and transportation of particles to froth products.
Article
Engineering, Chemical
Shun -Xiang Shi, Si-Qi Jiang, Chun -Chen Nie, Biao Li, Hong-Hao Chang, Xiang -Nan Zhu
Summary: This study proposed a method to improve the debromination effect of harmful resin in waste printed circuit boards (WPCBs) by using ultrafine milling of resin and loading debromination agent on porous gasification slag. The results showed that using gasification slag-FeCl2/FeCl3 composite could increase the debromination efficiency. Therefore, cooperative treatment can achieve the resource utilization of the two wastes.
ADVANCED POWDER TECHNOLOGY
(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)