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A functionalized activated carbon adsorbent prepared from waste amidoxime resin by modifying with H_(3)PO_(4) and ZnCl_(2) and its excellent Cr(Ⅵ)adsorption

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 585-598页

作者： Chunlin He Yun Liu Mingwei Qi Zunzhang Liu Yuezhou Wei toyohisa fujita Guifang Wang Shaojian Ma Wenchao Yang School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning 530004China School of Nuclear Science and Technology University of South ChinaHengyang 421000China School of Nuclear Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of New Low-carbon Green Chemical Technology Education Department of Guangxi Zhuang Autonomous RegionNanning 530004China

With the application of resins in various fields, numerous waste resins that are difficult to treat have been produced. The industrial wastewater containing Cr(Ⅵ) has severely polluted soil and groundwater environments, thereby endangering human health. Therefore, in this paper, a novel functionalized mesoporous adsorbent PPR-Z was synthesized from waste amidoxime resin for adsorbing Cr(Ⅵ). The waste amidoxime resin was first modified with H3PO4 and ZnCl_(2), and subsequently, it was carbonized through slow thermal decomposition. The static adsorption of PPR-Z conforms to the pseudo-second-order kinetic model and Langmuir isotherm, indicating that the Cr(Ⅵ) adsorption by PPR-Z is mostly chemical adsorption and exhibits single-layer adsorption. The saturated adsorption capacity of the adsorbent for Cr(Ⅵ) could reach 255.86 mg/g. The adsorbent could effectively reduce Cr(Ⅵ) to Cr(Ⅲ) and decrease the toxicity of Cr(Ⅵ) during adsorption. PPR-Z exhibited Cr(Ⅵ) selectivity in electroplating wastewater. The main mechanisms involved in the Cr(Ⅵ) adsorption are the chemical reduction of Cr(Ⅵ) into Cr(Ⅲ) and electrostatic and coordination interactions. Preparation of PPR-Z not only solves the problem of waste resin treatment but also effectively controls Cr(Ⅵ) pollution and realizes the concept of “treating waste with waste”.

关键词： waste amidoxime resin mesoporous adsorbent H_(3)PO_(4)and ZnCl_(2)processing Cr(VI)adsorption electroplating wastewater

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Solvent extraction and separation of cobalt from leachate of spent lithium-ion battery cathodes with N263 in nitrite media

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International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 897-907页

作者： Yingnan Yang Yingjie Yang Chunlin He Yuezhou Wei toyohisa fujita Guifang Wang Shaojian Ma Wenchao Yang School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials Nanning 530004China Key Laboratory of New Low-carbon Green Chemical Technology Education Department of Guangxi Zhuang Autonomous RegionNanning 530004China School of Nuclear Science and Technology University of South ChinaHengyang 421000China School of Nuclear Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

To effectively separate and recover Co(Ⅱ) from the leachate of spent lithium-ion battery cathodes,we investigated solvent extraction with quaternary ammonium salt N263 in the sodium nitrite system.NO_(2)^(-)combines with Co(Ⅱ) to form an anion [Co(NO_(2))_(3)]^(-),and it is then extracted by N263.The extraction of Co(Ⅱ) is related to the concentration of NO_(2)^(-).The extraction efficiency of Co(Ⅱ) reaches the maximum of99.16%,while the extraction efficiencies of Ni(Ⅱ),Mn(Ⅱ),and Li(Ⅰ) are 9.27%-9.80% under the following conditions:30vol% of N263 and15vol% of iso-propyl alcohol in sulfonated kerosene,the volume ratio of the aqueous-to-organic phase is 2:1,the extraction time is 30 min,and1 M sodium nitrite in 0.1 MHNO_(3).The theoretical stages require for the Co(Ⅱ) extraction are performed in the McCabe–Thiele diagram,and the extraction efficiency of Co(Ⅱ) reaches more than 99.00% after three-stage counter-current extraction with Co(Ⅱ) concentration of 2544mg/L.When the HCl concentration is 1.5 M,the volume ratio of the aqueous-to-organic phase is 1:1,the back-extraction efficiency of Co(Ⅱ)achieves 91.41%.After five extraction and back-extraction cycles,the Co(Ⅱ) extraction efficiency can still reach 93.89%.The Co(Ⅱ) extraction efficiency in the actual leaching solution reaches 100%.

关键词： cobalt N263 sodium nitrite extraction iso-propyl alcohol spent lithium-ion battery

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Two-step accelerated mineral carbonation and decomposition analysis for the reduction of CO_2 emission in the eco-industrial parks

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Journal of Environmental Sciences 2014年第7期26卷 1411-1422页

作者： Seok Jung Li Pang Wang Gjergj Dodbiba toyohisa fujita Department of Systems Innovation Graduate School of Engineering The University of TokyoBunkyo-Ku Tokyo 113-8656 Japan

Carbon dioxide（CO2） emissions are a leading contributor to the negative effects of global warming. Globally, research has focused on effective means of reducing and mitigating CO2 emissions. In this study, we examined the efficacy of eco-industrial parks（EIPs） and accelerated mineral carbonation techniques in reducing CO2 emissions in South Korea.First, we used Logarithmic Mean Divisia Index（LMDI） analysis to determine the trends in carbon production and mitigation at the existing EIPs. We found that, although CO2 was generated as byproducts and wastes of production at these EIPs, improved energy intensity effects occurred at all EIPs, and we strongly believe that EIPs are a strong alternative to traditional industrial complexes for reducing net carbon emissions. We also examined the optimal conditions for using accelerated mineral carbonation to dispose of hazardous fly ash produced through the incineration of municipal solid wastes at these EIPs. We determined that this technique most efficiently sequestered CO2 when micro-bubbling, low flow rate inlet gas, and ammonia additives were employed.

关键词： CO2 emissionsLMDI analysisAccelerated mineral carbonation EIPs

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从模拟高放射废液中电化学回收钯和银

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Transactions of Nonferrous Metals Society of China 2022年第3期32卷 1031-1040页

作者：王友彬邹睿韦悦周 Tsuyoshi ARAI toyohisa fujita 广西大学资源环境与材料学院南宁530004 广西大学广西有色金属及特色材料加工重点实验室南宁530004 Department of Material Science and Engineering Shibaura Institute of TechnologyTokyo 3-9-14Japan

为从高放射废液(HLLW)中回收钯和银,采用循环伏安法和恒电位沉积法研究钯和银在模拟硝酸溶液中的电化学行为。利用扫描电子显微镜(SEM)和X射线衍射仪(XRD)观察沉积产物的形貌并分析其组成。结果表明,在单独电沉积银时亚硝酸根的生成促... 详细信息

为从高放射废液(HLLW)中回收钯和银,采用循环伏安法和恒电位沉积法研究钯和银在模拟硝酸溶液中的电化学行为。利用扫描电子显微镜(SEM)和X射线衍射仪(XRD)观察沉积产物的形貌并分析其组成。结果表明,在单独电沉积银时亚硝酸根的生成促进银的溶解。当同时电沉积钯和银时,相同时间内更多金属被沉积,且沉积的银没有再出现溶解。在-0.4~-0.6 V (vs MSE)的电位下,溶液中的金属被完全电沉积回收,沉积物组成为银和氢化钯。钯的电沉积可以促进析氢,随后加速亚硝酸根和氢气之间的反应,使溶液中的亚硝酸浓度降低,从而抑制银的再溶解。

关键词：电沉积金属回收亚硝酸生成促进作用形貌特性

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Doping strategy on improving the overall cathodic performance of double perovskite LnBaCo_(2)O_(5+σ)(Ln=Pr,Gd)as potential SOFC cathode materials

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Journal of Materiomics 2023年第5期9卷 825-837页

作者： Fangze Chen Dacheng Zhou Xueqing Xiong Juntao Pan Donglin Cai Ze Wei Xiyong Chen Yihui Liu Nengneng Luo Jialin Yan toyohisa fujita State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning530004GuangxiChina School of Resources Environment and MaterialsGuangxi UniversityNanning530004GuangxiChina Hubei Key Laboratory of Advanced Technology for Automotive Components&Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan430070HubeiChina

A series of single-phase double perovskite Pr1-xGdxBaCo_(2)-yFeyO_(5+σ)(x=0,0.5 and 1,0≤y≤1)materials were engineered through A/B site co-doping strategy to improve the mechanical,electrical and electrochemical properties as potential cathode materials for the application of intermediate solid oxide fuel cells(IT-SOFCs).The corresponding thermochemical stability,thermal expansion behavior,electrical conductivity and cathodic polarization resistance of the materials were systematically investigated.It was found that the A-site dual lanthanide doped Pr_(0.5)Gd_(0.5)BaCo_(2)O_(5+σ)(PGBCO)exhibits improved electrical conductivity,reduced thermal expansion,and comparatively low electrochemical polarization resistance versus single lanthanide double perovskite,PrBaCo_(2)O_(5+σ)(PBCO)and GdBaCo_(2)O_(5+σ)(GBCO)materials.Further investigation on the effect of B-site Fe-doping on Pr_(0.5)Gd_(0.5)BaCo_(2)-yFeyO_(5)+σ(PGBCF-y,0≤y≤1)reveals that all the PGBCF-y compositions exhibit excellent chemical stability with Gd-doped ceria(GDC)at operating temperatures not higher than 1100℃.Besides,doping of Fe in B-site can effectively reduce the thermal expansion coefficients(TECs)of the Pr_(0.5)Gd_(0.5)BaCo_(2)O_(5)+σceramics at 30e1000℃.And the electrochemical impedance spectra(EIS)results show that the PGBCF-y|GDC|PGBCF-y symmetric cells have acceptable low area specific polarization resistances.Further examination of the cathodic polarization and characteristic capacitance from the AC impedance spectra by employing the relaxation time distribution(DRT)method demonstrated that charge transfer is the dominating subprocess for the oxygen transport through the materials.

关键词： Double perovskite Electrical conductivity Thermal expansion Electrochemical polarization Thermochemical stability

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Sorting Techniques for Plastics Recycling

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过程工程学报 2006年第2期6卷 186-191页

作者： Gjergj Dodbiba Jun Sadaki Atsushi Shibayama toyohisa fujita Department of Geosystem Engineering Graduate School of Engineering University of Tokyo Tokyo 113-8654 Japan

This paper presents the basic principles of three different types of separating methods and a general guideline for choosing the most effective method for sorting plastic mixtures. It also presents the results of the tests carried out for separation of PVC, ABS and PET from different kinds of plastic mixtures in order to improve the grade of the raw input used in mechanical or feedstock recycling.

关键词：分选技术塑料分离再循环回收

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Removal of Anionic Metal Ions from Wastewater by Hydroxide-type Adsorbents

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过程工程学报 2006年第3期6卷 357-362页

作者： toyohisa fujita Gjergj Dodbiba Jun Sadaki Atsushi Shibayama Dept. Geosystem Eng. Graduate School Eng.The University of TokyoTokyo 113-8654Japan Dept. Material-Process. Eng.&Appl. Chem. for Environ. Faculty Eng.&Resources Sci.Akita Univ.Akita 010-8502Japan

Generally speaking,anionic metal concentrations in wastewater from industries and mineral processing plants are well above the allowed limits for effluent set by the Ministry of Environment of Japan. Nowadays,the removal of anionic ions has been considered difficult and development of new process is desperately needed. In this paper,we report the development of three hydroxide-type adsorbents,illustrating their adsorption efficiency in removing As,Se,Mo and Sb ions from aqueous solutions. The main finding of this work was that the adsorption behavior was influenced very much by both the pH and the adsorbent concentration. Nevertheless,the newly developed hydroxide-type adsorbents were very effective in reducing the concentration of those anionic ions.

关键词： hydroxide-type adsorbent adsorption anionic metal ions removal wastewater

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热浸镀锌层界面的微区电化学腐蚀行为

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表面技术 2022年第9期51卷 217-225页

作者：林学亮王友彬辛延琛高锋韦悦周 toyohisa fujita 广西大学广西有色金属及特色材料加工重点实验室南宁530004 广西大学资源环境与材料学院南宁530004

目的探究钢铁热浸镀锌的镀层/钢基体界面的微区电化学特性及腐蚀行为。方法采用扫描电化学显微镜(SECM)分析技术,研究镀层/钢基体界面在0.1 mol/L NaCl溶液腐蚀过程中微区电流的演变过程,结合扫描电镜(SEM)、能谱仪(EDS)、3D显微镜以及... 详细信息

目的探究钢铁热浸镀锌的镀层/钢基体界面的微区电化学特性及腐蚀行为。方法采用扫描电化学显微镜(SECM)分析技术,研究镀层/钢基体界面在0.1 mol/L NaCl溶液腐蚀过程中微区电流的演变过程,结合扫描电镜(SEM)、能谱仪(EDS)、3D显微镜以及X射线衍射技术(XRD)等分析腐蚀产物的物相组成与分布规律。结果在腐蚀过程中,镀锌钢的腐蚀产物主要分布在热浸镀锌层界面处靠近钢基体的一侧,在镀锌层表面的分布较少,腐蚀产物主要由Zn_(5)(OH)_(8)Cl_(2)、Zn_(5)(OH)_(6)(CO_(3))_(2)与ZnO等物相组成。在腐蚀开始阶段,钢基体区域的SECM还原电流(I=1.2)大于镀锌层(I=1.1)。随着腐蚀时间的延长,镀层/钢基体界面处的SECM还原电流整体降低,同时在界面靠近钢基体一侧存在电流凹陷区(I=1.0),表明腐蚀产物主要沉积在此处,并对镀层的腐蚀起到保护作用。此外,在腐蚀过程中氧气的消耗主要发生在钢基体区域,随着腐蚀时间的增加,镀层和钢基体表面的溶解氧含量都逐渐降低。结论在浸泡腐蚀过程中,镀锌层作为阳极,溶解生成Zn^(2+),并向钢基体区域扩散,同时钢基体表面消耗氧气,还原形成OH–向镀锌层区域扩散。Zn^(2+)与OH^(–)以及溶液中其他离子结合,生成腐蚀产物,在靠近镀层/钢基体界面处的钢基体一侧沉淀,对钢基体起到一定的保护作用。

关键词：微区电化学热浸镀锌界面扫描电化学显微镜腐蚀行为

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Invited Review Reduction,reuse and recycle of spent Li-ion batteries for automobiles:A review

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 179-192页

作者： toyohisa fujita Hao Chen Kai-tuo Wang Chun-lin He You-bin Wang Gjergj Dodbiba Yue-zhou Wei College of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Graduate School of Engineering The University of TokyoTokyo 113-8656Japan

The demand for Li-ion batteries (LIBs) for vehicles is increasing. However, LIBs use valuable rare metals, such as Co and Li, aswell as environmentally toxic reagents. LIBs are also necessary to utilize for a long period and to recycle useful materials. The reduction, reuse,and recycle (3R) of spent LIBs is an important consideration in constructing a circular economy. In this paper, a flowsheet of the 3R of LIBs isproposed and methods to reduce the utilization of valuable rare metals and the amount of spent LIBs by remanufacturing used parts and designingnew batteries considering the concept of 3R are described. Next, several technological processes for the reuse and recycling of LIBs are introduced.These technologies include discharge, sorting, crushing, binder removal, physical separation, and pyrometallurgical and hydrometallurgicalprocessing. Each process, as well as the related physical, chemical, and biological treatments, are discussed. Finally, the problem of developedtechnologies and future subjects for 3R of LIBs are described.

关键词： Li-ion battery reduction reuse recycle processing automobiles

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矿区复垦土壤重金属含量分布与光谱特征研究——以徐州市柳新矿区为例

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中国矿业大学学报 2012年第5期41卷 827-832页

作者：董霁红于敏赵银娣张珏 toyohisa fujita 中国矿业大学环境与测绘学院江苏徐州221116 常熟市国土资源局海虞分局江苏常熟215500 工学院大学情报学部东京大学工学系

以徐州柳新矿区复垦土壤为研究对象,采用传统采样检测方法分析了Cd,Cu,Pb,Zn,Cr等重金属元素在土壤中的含量,借助ISI921VF系列野外地物光谱辐射计和IR981短波红外地物光谱仪野外测量样点土壤的光谱,提取其光谱特征,并对光谱特征参数与... 详细信息

以徐州柳新矿区复垦土壤为研究对象,采用传统采样检测方法分析了Cd,Cu,Pb,Zn,Cr等重金属元素在土壤中的含量,借助ISI921VF系列野外地物光谱辐射计和IR981短波红外地物光谱仪野外测量样点土壤的光谱,提取其光谱特征,并对光谱特征参数与土壤中重金属含量进行相关性分析,建立了利用土壤光谱反射率估算土壤重金属含量的预测模型.结果表明:通过分析土壤反射光谱特征能间接反映土壤重金属含量.从而实现土壤重金属含量的间接测定,为土壤重金属污染的调查与监测提供一种简单、快速的测定方法.

关键词：复垦土壤重金属反射光谱相关性预测模型

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