Article
Environmental Sciences
Junwei Yu, Ziyu Meng, Chong Chi, Xueping Gao, Baolei Chen, Bo Zhu, Kun Qiao
Summary: A simple and efficient regeneration technology for Cu(II)-adsorbed activated carbon fiber felts (ACFFs) is proposed in this study, achieving high regeneration efficiency and remarkable enhancement of adsorptivity simultaneously. By optimizing parameters, the optimum process parameters for ACFFs reutilization are determined, with the regeneration rates maintained at high levels in five cycles. The enhancement of Cu(II) adsorptivity is mainly attributed to the increase in specific surface area, micropore volume, and surface chemical structure after treated by the regeneration process.
Article
Polymer Science
Kwan-Woo Kim, Hye-Min Lee, Seong-Hyun Kang, Byung-Joo Kim
Summary: In this study, activated carbon fibers (ACFs) were prepared from polyethylene (PE) fibers using a new method. Through specific stabilizing and activation treatment, the total pore volume and specific surface area of these ACFs were increased to high values. This was achieved by utilizing a hybrid treatment process and optimizing activation conditions.
Article
Engineering, Environmental
Junwei Yu, Ziyu Meng, Shuhan Yan, Shengyao Zhao, Bo Zhu, Xun Cai, Kun Qiao
Summary: By precisely enhancing the ultramicropore volume at 0.56 nm through sonication-assisted hydrochloric acid reactivation, the Cu(II) electro-adsorptivity of ACFF is significantly increased, allowing for efficient adsorption and recovery of Cu(II).
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Chao Liu, Chenxu Gao, Wei Wang, Xiadong Wang, Yifan Wang, Wenjing Hu, Yaoguang Rong, Yue Hu, Lianbo Guo, Anyi Mei, Hongwei Han
Summary: Activated carbon synthesized from cellulose was used as back electrodes in perovskite solar cells, leading to improved efficiency due to enhanced wettability and contact between the electrodes and perovskites. The high oxygen content in the activated carbon also raised the work function of the electrodes, contributing to the performance enhancement in the cells.
Review
Polymer Science
Andrzej K. Bledzki, Holger Seidlitz, Krzysztof Goracy, Magdalena Urbaniak, Janina J. Roesch
Summary: The paper discusses the current international production volume and global market of carbon fiber reinforced polymer composites and potential development trends. It also presents examples of effective recycling methods for these composites, as well as legally binding legislation in the EU on polymer composite recycling.
Article
Engineering, Environmental
Qi Zuo, Hong Zheng, Pengyi Zhang, Yu Zhang, Baichao Zhang
Summary: In this study, we report a novel activated carbon fiber with multiple active sites, which can selectively and efficiently remove trace heavy metals from drinking water. The activated carbon fiber shows excellent application prospects in water purification.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Review
Engineering, Multidisciplinary
Manjeet Rani, Priyanka Choudhary, Venkata Krishnan, Sunny Zafar
Summary: The development of novel strategies for recycling and reusing fiber composites is driven by environmental and economic factors. This paper reviews various recycling methods and reuse of recovered fibers, highlighting the potential for high-value structural applications in the future. Challenges in fiber recycling and the high energy intensity of manufacturing glass and carbon fibers make them promising in terms of both environmental and economic perspectives.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Biochemistry & Molecular Biology
Szu-Han Wang, Feng-Cheng Chang
Summary: This study aimed to develop lignosulfonate activated carbon fibers (LACFs) and investigate the metal recovery mechanisms. The LACFs were prepared through electrospinning and CO2-based physical activation. The activated LACF exhibited a larger specific surface area, total pore volume, and micropore ratio, as well as more acidic and sulfur functional groups. The adsorption behaviors of Cu(II) and Au(III) on LACF could be described using the Freundlich and Langmuir model, respectively. Both systems involved physisorption and chemisorption, with mechanisms including electrostatic forces, Van der Walls forces, cation exchange, and surface complexation. Overall, this study provides a foundation for developing physically activated lignosulfonate carbon for metal ion recovery.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Biochemistry & Molecular Biology
Kwan-Woo Kim, Dong-Kyu Kim, Woong Han, Byung-Joo Kim
Summary: This study compares three recycling methods, mechanical grinding, steam pyrolysis, and the supercritical solvent process, for synthesizing polymer-matrix composites using recycled carbon fibers (RCFs). The results show that the steam pyrolysis process has the highest energy efficiency and is suitable for large-scale production in the domestic recycled carbon fiber market.
Article
Construction & Building Technology
Vitalii Ponomar, Elijah Adesanya, Katja Ohenoja, Mirja Illikainen
Summary: Fe-rich alkali-activated materials have been studied for their suitability for high-temperature application. The evolution of compressive strength, mineral composition and microstructure was monitored, revealing that water evaporation caused slight fluctuations in compressive strength below 400°C, collapse of the original gel structure led to a sharp drop in strength at 600°C, while sintering densification and formation of ceramic resulted in strength reinforcement above 600°C. The reaction between quartz aggregate and a sodium-rich binder further increased the strength.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Chemistry, Physical
Maryam Fayazi, Masoud Ghanei-Motlagh
Summary: The PET-AC/Cu(II)-A beads prepared by cross-linking technology showed high adsorption capacity, reusability, and potential as a desulfurization adsorbent for fuels.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Environmental Sciences
Chaomin Duan, Mianwu Meng, Huang Huang, Heng Wang, Hua Ding, Qi Zhang
Summary: In this paper, bamboo charcoal was activated with boric acid to prepare bamboo-based activated carbon (BAC), and then impregnated with ammonium acetate solution to develop porous adsorbent with ammonium acetate particles (N/BAC) for removing low concentration of HCHO at room temperature. The adsorption performance, surface chemical properties, and microstructure of the adsorbents were systematically investigated. The results showed that the N/BAC sample exhibited a high removal rate of 98.89%, which was 18.38% greater than that of the BAC sample.
ENVIRONMENTAL RESEARCH
(2023)
Article
Energy & Fuels
Xi Zhang, Yuzuo Wang, Xuewen Yu, Jianfei Tu, Dianbo Ruan, Zhijun Qiao
Summary: A novel activated carbon with excellent electrochemical performance, high specific surface area, and good cycle stability has been prepared using discarded separators from end-of-life supercapacitors as precursors. The activated carbon showed promising supercapacitor performance in both aqueous and organic electrolytes, indicating great potential for waste battery recycling.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Environmental Sciences
Md Abdullah Al Masud, Do Gun Kim, Won Sik Shin
Summary: This study investigates the use of calcium peroxide activated by Fe(II) for removing organic contaminants from natural groundwater. The results show that the method can effectively degrade phenol and can be further improved for better removal. The addition of activated carbon enhances the removal efficiency and reduces the generation of degradation by-products.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Andrea Saccani, Stefania Manzi, Grazia Totaro, Isabella Lancellotti
Summary: The study focuses on utilizing industrial waste to improve the mechanical properties of mortars for civil engineering applications, resulting in enhanced flexural strength and toughness. Acid treatment of scraps can further enhance the mechanical properties of the mortars.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Chemical
Junwei Yu, Kun Qiao, Bo Zhu, Xun Cai, Yuan Cheng, Xiaomin Yuan, Dongwei Liu
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2019)
Article
Environmental Sciences
Junwei Yu, Chong Chi, Bo Zhu, Kun Qiao, Xun Cai, Yuan Cheng, Shuhan Yan
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Chemistry, Physical
Chengrui Di, Junwei Yu, Baoming Wang, Alan Kin Tak Lau, Bo Zhu, Kun Qiao
Article
Chemistry, Physical
Kun Qiao, Anping Zhu, Baoming Wang, Chengrui Di, Junwei Yu, Bo Zhu
Article
Materials Science, Multidisciplinary
Liyuan Yu, Junwei Yu, Bo Zhu, Yuan Cheng, Mingpeng Shang, Min Zhang
MATERIALS RESEARCH EXPRESS
(2020)
Article
Materials Science, Multidisciplinary
Shuhan Yan, Junwei Yu, Bo Zhu, Kun Qiao, Xun Cai, Xiaomin Yuan, Chen Li
Summary: TiO2-loaded viscose-based activated carbon fibers (VACF) composite catalysts were prepared, showing enhanced photocatalytic effect for low concentration formaldehyde with the combination of TiO2 and VACFs. The Ti4+ ions in the composite catalysts form Ti-O-C bonds, leading to high catalytic activity for both formaldehyde degradation and bactericidal action.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Junwei Yu, Jiahao Wu, Manjia Li, Fan Zhou, Qinglin Xiao, Shengnan Zhang, Chen Li, Bo Zhu, Kun Qiao
Summary: After the ethylenediamine grafting process, VACF-N showed significantly enhanced removal rate and adsorptivity for 2.45 and 8.15 ppm formaldehyde gases. The maximum adsorption capacity reached 0.59 mg/g for 2.45 ppm FA gases (1.92 times that of pristine VACF) and 1.17 mg/g for 8.15 ppm FA gases.
Article
Nanoscience & Nanotechnology
Ye Zhang, Bo Zhu, Xun Cai, Xiaomin Yuan, Shengyao Zhao, Junwei Yu, Kun Qiao, Rongman Qin
Summary: This paper provides an effective solution to achieve rapid and uniform introduction of GO in PAN-based nanofibers via in situ polymerization, and systematically studies the optimization of nanofiber structure by GO in three consecutive stages. The interaction between PAN and GO significantly improves the arrangement of PAN molecular chains and the crystal size of the final turbostratic structure of CNFs, leading to a remarkable increase in tensile strength of CNFs with the addition of GO.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Environmental Sciences
Junwei Yu, Ziyu Meng, Chong Chi, Xueping Gao, Baolei Chen, Bo Zhu, Kun Qiao
Summary: A simple and efficient regeneration technology for Cu(II)-adsorbed activated carbon fiber felts (ACFFs) is proposed in this study, achieving high regeneration efficiency and remarkable enhancement of adsorptivity simultaneously. By optimizing parameters, the optimum process parameters for ACFFs reutilization are determined, with the regeneration rates maintained at high levels in five cycles. The enhancement of Cu(II) adsorptivity is mainly attributed to the increase in specific surface area, micropore volume, and surface chemical structure after treated by the regeneration process.
Article
Polymer Science
Junwei Yu, Feifei Chen, Shuhan Yan, Kun Qiao, Shengyao Zhao, Xian Zhao, Bo Zhu
Summary: This study presents a new method for preparing nitrogen and oxygen co-doped activated carbon hollow fibers (N/O-ACHF) with skin-core structure, which have a high hydrogen storage density. The N/O-ACHF exhibits excellent hydrogen storage performance due to its unique multistage pore structure and abundant surface functional groups.
Article
Nanoscience & Nanotechnology
Ye Zhang, Bo Zhu, Xiaomin Yuan, Baoming Wang, Xun Cai, Junwei Yu, Na Sun, Chengsen Li, Xuechen Liang
Summary: This paper uses onion-like carbon (OLC) as a nanofiller to optimize the graphitic structure of carbon nanofibers (CNFs) and enhance their strength and toughness. The in situ polymerization technique is used to ensure uniform distribution of OLC in the precursor of CNFs. The interaction between OLC and PAN matrix leads to thicker crystal domains in the nanofibers and a transformation into nanofibril crystals with better regularity and orientation. The embedded OLC acts as a template during carbonization to promote the formation of orderly graphitic structures in the fiber matrix.
ACS APPLIED NANO MATERIALS
(2022)
Review
Chemistry, Physical
Wenzhe Bao, Junwei Yu, Feifei Chen, Hengke Du, Wanqin Zhang, Shuhan Yan, Tianhao Lin, Jialin Li, Xian Zhao, Bo Zhu
Summary: Solid hydrogen storage materials are crucial for solving the storage problem in the large-scale application of hydrogen energy. Metal-organic frameworks (MOFs) show potential as solid hydrogen storage materials, but further research is needed on their storage performance under ambient conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Polymer Science
Baoming Wang, Shengzong Ci, Mingzhe Zhou, Chengrui Di, Junwei Yu, Bo Zhu, Kun Qiao
Summary: In this study, the ageing mechanisms and moisture absorption behavior of epoxy resins and carbon fiber composites were investigated. The results showed that the ageing process primarily involved physical adsorption of water, which did not significantly affect the chemical structure and microstructure. The absorbed water caused micro-cracks at the fiber-resin interface, weakening the interfacial strength and reducing the mechanical properties of the composites.
Article
Engineering, Environmental
Junwei Yu, Ziyu Meng, Shuhan Yan, Shengyao Zhao, Bo Zhu, Xun Cai, Kun Qiao
Summary: By precisely enhancing the ultramicropore volume at 0.56 nm through sonication-assisted hydrochloric acid reactivation, the Cu(II) electro-adsorptivity of ACFF is significantly increased, allowing for efficient adsorption and recovery of Cu(II).
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
