Article
Engineering, Chemical
Xianke Sun, Yanxin Qin, Wen Zhou
Summary: This paper studied the degradation of amoxicillin by ultrasound-zero valent iron activated sodium persulfate and optimized the best degradation conditions. The research found that ultrasonic power, sulfate concentration, and zero-valent iron dosage have significant impacts on the removal efficiency of amoxicillin.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Bo Wang, Chi Zhu, Dan Ai, Zhiping Fan
Summary: In this study, green nano zero-valent iron biochar was prepared using green synthesis method with green tea extraction solution as reducing agent and green tea residues as raw material. This material showed improved dispersibility of Fe0, prevented agglomeration, and promoted PNP degradation. The system had high oxidation resistance, effective catalytic degradation pathways, and good removal effect on PNP.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Dandan Dong, Oh Kyung Choi, Jae Woo Lee
Summary: Both zero valent iron (ZVI) and nano-scaled ZVI (nZVI) can be used for biomethanation of CO2 under anaerobic conditions, but ZVI shows more effective and stable CO2 conversion with less loss.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Huiping Tang, Wencai Cheng, Yunpeng Yi, Congcong Ding, Xiaoqin Nie
Summary: Fe-0/APTES-GO composites show promising results in removing U(VI) due to the reducing activity of Fe-0 and abundant functional groups on the composites. Batch experiments demonstrate the effective removal of uranium by Fe-0/APTES-GO composites.
Article
Engineering, Chemical
Ying Zhao, Qingxu Li, Qiantao Shi, Beidou Xi, Xinyi Zhang, Zhiqiang Jian, Gaoting Zhou, Xiaoguang Meng, Xuhui Mao, Dejun Kang, Bin Gong
Summary: Extensive studies have been conducted on phosphate removal by micron-scale zero-valent iron (mZVI). The mechanisms of phosphate removal were elucidated using ATR-FTIR, XRD, and XANES techniques, revealing that precipitation is the main pathway for phosphate removal by ZVI under aerobic conditions. This study significantly improves our understanding of the fundamental processes involved in phosphate removal by ZVI.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yang Ruan, Huimin Zhang, Zijing Yu, Zenghui Diao, Gang Song, Minhua Su, Li'an Hou, Diyun Chen, Shuao Wang, Lingjun Kong
Summary: The immobilization of uranium from wastewater by zero valent iron was studied in this work. A biochar supported nano zero valent iron was obtained and the uranium immobilization efficiency was enhanced to 99.9% in the presence of phosphate. The sequence of uranium, Fe/BC(900) and phosphate influenced the uranium immobilization efficiency.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Kamil Krawczyk, Daniele Silvestri, Nhung H. A. Nguyen, Alena Sevcu, Dariusz Lukowiec, Vinod V. T. Padil, Michal Rezanka, Miroslav Cernik, Dionysios D. Dionysiou, Stanislaw Waclawek
Summary: This research introduces a novel remedial technique using modified nanoscale zero-valent iron particles (nZVI) for the degradation of pollutants. The addition of a cyclodextrin polymer enhances the degradation efficiency and reduces the toxicity of the nanoparticles. Furthermore, the degradation products are less toxic to bacteria and microalgae, indicating a simple and environmentally friendly cleaning process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Chemical
Jingxi Zhang, Yifan Niu, Yu Zhou, Shaohua Ju, Yongwan Gu
Summary: In this study, green tea was used as a reducing agent to prepare GT-nZVI/Cu nano-zero-valent iron -copper bimetallic materials for nitrate degradation. The process conditions for nitrate removal by GT-nZVI/Cu were optimized, and the reduction pathway and removal mechanism of nitrate were studied. The results showed that GT-nZVI/Cu particles have sizes between 50 and 70 nm, and the addition of copper ions accelerates the reaction time and rate. The study provides a new route for the green preparation and efficient application of nZVI.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Environmental
Miroslav Brumovsky, Jana Oborna, Petr Lacina, Michal Hegedus, Ondra Sracek, Jan Kolarik, Martin Petr, Josef Kaslik, Thilo Hofmann, Jan Filip
Summary: Laboratory studies have shown that sulfidated nanoscale zero-valent iron (S-nZVI) particles exhibit enhanced reactivity, reducing capacity, and electron selectivity for removing Cr(VI) from contaminated waters. Field experiments confirmed the applicability of S-nZVI for remediating a Cr(VI)-contaminated aquifer, demonstrating long-term decreases in Cr(VI) concentrations and groundwater redox potential.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Oriol Gibert, Misael Abenza, Monica Reig, Xanel Vecino, Damian Sanchez, Marina Arnaldos, Jose Luis Cortina
Summary: Injection of zero-valent iron nanoparticles (nZVI) has shown significant removal efficiency of NO3- in groundwater through chemical reduction. The application of nZVI pulses resulted in pH increase, redox potential drop, and release of Fe(II) and TOC in the effluent.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Yingzi Lin, Jing Chen, Mingliang Zhou, Gen Liu, Siwen Li, Chunyan Shi, Mengshi Wang, Shenglin Qi
Summary: This paper discusses the efficiency and mechanism of using nitrilotriacetic acid (NTA) as a complexing agent to enhance the zero-valent iron (Fe0)/peroxymonosulfate (PMS) system for the removal of sulfamethazine (SMZ) from water. The research results show that the addition of NTA increases the soluble iron content and the decomposition rate of PMS. Additionally, different inorganic ions, such as Cl-, have been found to affect the degradation of SMZ. In actual water bodies, the PMS/Fe0/NTA system can degrade SMZ up to 79.36%. Toxicity tests demonstrate a decrease in the inhibition rate of luminescent bacteria after degradation.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Chemical
Chengfeng Yang, Kuiling Li, Lili Xu, Zhiyong Wang, Ling Yu, Jun Wang
Summary: The mZVI/PVDF composite membrane successfully addressed the challenges of easy agglomeration, oxidation, loss, and difficult reuse faced by bare mZVI, maintaining 100% nitrobenzene degradation in eight cycles. The detailed study on the degradation process provided insights for optimizing the use of mZVI.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Jiajia Si, Xinglong Yang, Hengwei Luan, Yang Shao, Kefu Yao
Summary: This study successfully enhanced the performance of zero-valent iron in degrading dyeing wastewater by constructing composite materials with a special porous structure. The porous structure greatly improved the degradation performance of the composite materials, especially in neutral and alkaline environments, providing the possibility of achieving cheap, fast, and durable degradation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Qingxia Li, Xin Kong, Yuxin Chen, Jianan Niu, Jia Jing, Jin Yuan, Yifeng Zhang
Summary: This study investigates how to enhance methane production from food waste after hydrothermal pretreatment. The results demonstrate a significant increase in methane yield when zero-valent iron and magnetite are used together, and high organic loading is favorable for methane production. Microbial diversity analysis further reveals the dominant pathways and metabolic processes involved in methane generation.
Review
Chemistry, Multidisciplinary
Sankar Sudharsan Rameshwar, Baskaran Sivaprakash, Natarajan Rajamohan, Badr A. Mohamed, Dai-Viet N. Vo
Summary: Antibiotic resistance is a major health issue and the diffusion of antibiotic pollution in the environment contributes to it. This review discusses the use of MXene and nano-zero-valent iron-based materials as effective methods to remove tetracyclines from wastewater. These materials can serve as adsorbents, photocatalysts, electrocatalysts, and membranes for the removal of tetracyclines. Importantly, a MXene derived from carbide nitride and bismuth oxobromide removed 99% of tetracycline in just 30 minutes, and a nano-zero-valent iron doped with graphene oxide and copper resulted in 100% degradation of tetacycline in 15 minutes.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Toxicology
Maori Kono, Tomoaki Okuda, Nami Ishihara, Hiroyuki Hagino, Yuto Tani, Hiroshi Okochi, Chiharu Tokoro, Masayuki Takaishi, Hidefumi Ikeda, Yasuhiro Ishihara
Summary: PM2.5 exposure can induce the release of chemokines in the skin, leading to neutrophil activation and an unregulated inflammatory reaction in the skin.
TOXICOLOGICAL RESEARCH
(2023)
Article
Automation & Control Systems
Chenzuo Ye, Yutaro Takaya, Yuki Tsunazawa, Kazuhiro Mochidzuki, Chiharu Tokoro
Summary: This study investigates the effect of agitator shape on grinding efficiency through experiments, kinetic analysis, and DEM simulations. The results show that the grinding rate constant of Agitator B is approximately 40% greater than that of Agitator A. The grinding modes in the two agitators are different, with surface grinding dominant in Agitator A and bulk grinding dominant in Agitator B.
INTERNATIONAL JOURNAL OF AUTOMATION TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yoshiki Egawa, Taketoshi Koita, Soowon Lim, Takao Namihira, Chiharu Tokoro
Summary: The development of efficient recycling technology for resin adhesives is necessary for accelerating the resource recycling of plastics and creating a recycling-oriented society. In this study, we utilized a fine wire explosion induced by an electric pulse to selectively separate different resin adherends. By applying a solvent and a silver wire to the interface of two resin plates and applying electric pulses, the separation of resin materials was achieved through gas expansion and wire vaporization.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Physics, Fluids & Plasmas
Masataka Kondo, Taketoshi Koita, Soowon Lim, Takao Namihira, Chiharu Tokoro
Summary: This study characterized the state of a metal sphere in air and used pulsed discharge to cause an explosion of the sphere in the bonding adhesive, thereby separating the bonded structures. The results showed that adding a metal sphere to the adhesive allowed for selective separation of the adherend.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Environmental Sciences
K. Tsuchiya, S. Fuchida, C. Tokoro
Summary: The study found that LDHs (layered double hydroxides) produced from magnesium oxide (MgO) and aluminum (Al) have good performance in removing hexavalent selenium (Se(VI)). By extending the hydration time of MgO and/or the reaction time of MgO-Al, Mg-Al LDHs with good Se(VI)-removal performance can be produced.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
Manabu Inutsuka, Masataka Kondo, Taketoshi Koita, Soowon Lim, Keisuke Ota, Tomoki Honda, Ryo Ogawa, Takao Namihira, Chiharu Tokoro
Summary: Facile techniques for debonding polymeric adhesives from metals are needed for material recycling. A promising solution is the pulsed discharge debonding method, where a high voltage pulsed discharge is applied to the system, resulting in rapid gas expansion and shock-wave emissions that debond the adhesive. However, the conventional method requires water, but this study successfully added filler to the adhesive to achieve effective pulsed discharge debonding. The threshold volume fraction of the filler for effective pulsed discharge inside the adhesive was determined based on experimental data and a percolation model.
JOURNAL OF ADHESION
(2023)
Article
Chemistry, Physical
Juan Qin, Sujuan Yuan, Mauricio Cordova-Udaeta, Keishi Oyama, Chiharu Tokoro
Summary: In this study, tobermorite was synthesized and used to remove Cd2+ from an aqueous solution. The synthesized tobermorite had a well-crystallized structure with a lot of mesopores and a large specific surface area. It could adjust the solution pH through the release of Ca2+ and OH- ions. The efficient removal of Cd2+ was achieved through surface complexation and ion exchange.
Article
Chemistry, Physical
Keishi Oyama, Kentaro Hayashi, Yusei Masaki, Takaya Hamai, Shigeshi Fuchida, Yutaro Takaya, Chiharu Tokoro
Summary: A passive treatment process using sulfate-reducing bacteria (SRB) was found effective in removing heavy metals from acid mine drainage (AMD), but the mechanism involved has been poorly understood. In this study, a sulfate-reducing column test was conducted with supplemental ethanol as an electron donor, and the reaction mechanism was investigated using geochemical modeling and X-ray absorption fine structure (XAFS) analysis. The results revealed that Cu was easily removed from the top surface of the column, while Zn and Cd depletion occurred in the middle of the column due to sulfide formation by SRB. Geochemical modeling and XAFS analysis confirmed the validity of the observation. These findings suggest that the developed geochemical model can be a useful tool in predicting heavy metal removal in AMD treatment with SRB.
Article
Engineering, Chemical
Yoshihiro Kosaku, Yuki Tsunazawa, Chiharu Tokoro
Summary: The discrete element method (DEM) is a reliable tool for analyzing powder processes, but it is computationally expensive for fine particle simulations. A promising solution is the use of coarse grain models, where multiple original particles are replaced with one large particle. This study proposes a new coarse grain model with a systematic parameter scaling law for adhesion forces, specifically liquid bridge forces. The simulation results agree well with the experimental results, demonstrating the superiority of the coarse grain model.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Yuki Tsunazawa, Chiharu Tokoro, Yuji Ando, Tomoki Nakamura, Ryosuke Tsukimi, Nobuo Miyatake
Summary: This study demonstrates the applicability of gravity separation for the recycling of biodegradable plastics. The experimental results show that a laboratory-specific gravity separator achieves a high recovery ratio and purity for light-density plastics. Simulations further reveal that the separation efficiency is affected by particle size, but the gravity separator is still sufficient for the separation and recycling of biodegradable plastics.
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
(2023)
Article
Engineering, Environmental
Aya Heiho, Izuru Suwa, Yi Dou, Soowon Lim, Takao Namihira, Taketoshi Koita, Kazuhiro Mochidzuki, Shinsuke Murakami, Ichiro Daigo, Chiharu Tokoro, Yasunori Kikuchi
Summary: This study conducted a prospective life cycle assessment to evaluate the effectiveness of proposed technologies for recycling photovoltaic panels. The technologies include aluminum frame separation, precise mechanical separation, hot-knife method for glass/ethylene-vinyl acetate separation, and high-voltage pulsed discharge for copper and silver recovery. Applying resource recovery technology reduces landfill waste and enables the reuse or recycle of glass. The high-voltage pulsed discharge produces a high concentration of copper that can be easily incorporated into smelting processes.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Engineering, Chemical
Yanhui Kong, Yutaro Takaya, Mauricio Cordova-Udaeta, Chiharu Tokoro
Summary: This study proposes a novel method for selective lithium extraction from spent ternary nickel-cobalt-manganese (NCM) LIBs using NaClO as an oxidant under near-neutral pH and oxidative conditions. The addition of NaClO is found to be essential for the selective extraction of lithium from the layered NCM structure under non-acidic conditions. Additionally, the oxidation by NaClO also induces cracking and phase transition of the spent cathode particles, enhancing lithium extraction efficiency. The proposed method is simple, safe, and cost-effective, making it attractive for practical application.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yutaro Takaya, Syuichi Kuwaba, Yusaku Tsujimura, Katsunori Yamaguchi, Chiharu Tokoro
Summary: All-solid-state lithium-ion batteries (ASS-LIBs) are expected to replace current liquid-based LIBs in the near future due to their high energy density and improved safety. However, it is yet to be determined if ASS-LIBs can be effectively recycled using the current recycling processes used for liquid-based LIBs.
Article
Green & Sustainable Science & Technology
Jifeng Xue, Keishi Oyama, Shigeshi Fuchida, Chiharu Tokoro
Summary: In this study, EDTA was used to control the effects of Mg(OH)(2) depression on the recoveries of chalcopyrite and pyrite, and to restrict Cu activation in pyrite flotation. The results showed that moderate EDTA dosages could potentially enable effective separation of chalcopyrite and pyrite.
JOURNAL OF SUSTAINABLE METALLURGY
(2023)
Article
Chemistry, Multidisciplinary
Hirokazu Narita, Motoki Maeda, Chiharu Tokoro, Tomoya Suzuki, Mikiya Tanaka, Hideaki Shiwaku, Tsuyoshi Yaita
Summary: In this study, the mechanism of Se(iv) and Se(vi) extraction from aqueous HCl solutions by EHBAA was investigated. The extraction behavior and structural properties of the dominant Se species in solution were examined. It was found that Se(vi) was reduced to Se(iv) in 8 M HCl, and around 50% of Se(vi) was extracted from 0.5 M HCl using 0.5 M EHBAA. On the other hand, Se(iv) was hardly extracted from 0.5 to 5 M HCl, but the extraction efficiency increased drastically above 5 M, reaching approximately 85%. The apparent stoichiometries of Se(iv) or Se(vi) to EHBAA were 1:1 and 1:2, respectively.