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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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Bi_(2)O_(3)/g-C_(3)N_(4)hollow core–shell Z-scheme heterojunction for photocatalytic uranium extraction

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Nano Research 2024年第7期17卷 5845-5855页

作者： Hao Fu Yuehua Pan Zhenyu Cai Yuxiang Deng Minchen Hou yuezhou wei Toyohisa Fujita Shunyan Ning Youbin Wang Shaolong Zhang Xinpeng Wang School of Chemistry&Chemical Engineering Guangxi UniversityNanning 530004China School of Resources Environment and MaterialsGuangxi UniversityState Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresNanning 530004China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China School of Materials Sun Yat-sen UniversityShenzhen 518107China School of Nuclear Science and Technology University of South ChinaHengyang 421001China

Photocatalytic uranium extraction from radioactive nuclear wastewater and seawater is critical for promoting the sustainable advancement of nuclear industry,but the complexity of real-world environments,particularly the occurrence of anoxic and oxygen-enriched states,presents significant challenges to effective uranium ***,a layered hollow core–shell structure of Bi_(2)O_(3)/g-C_(3)N_(4)Z-scheme heterojunction photocatalyst has been designed and successfully applied for photocatalytic uranium extraction in both aerobic and oxygen-free conditions,and the extraction efficiency of uranium can reach 98.4%and 99.0%,***,the photocatalyst still has ultra-high extraction efficiency under the influence of pH,inorganic ions,and other *** exceptional capability for uranium extraction is on the one hand due to the distinctive hollow core–shell architecture,which furnishes an abundant quantity of active *** the other hand,benefiting from the suitable band gap structure brought by the construction of Z-scheme heterojunction,Bi_(2)O_(3)/g-C_(3)N_(4)exhibits current densities(1.00μA/cm^(2))that are 5.26 and 3.85 times greater than Bi_(2)O_(3)and g-C_(3)N_(4),respectively,and the directional migration mode of Z-scheme carriers significantly prolongs the lifetime of photogenerated charges(1.53 ns),which separately surpass the pure samples by factors of 5.10 and ***,the reaction mechanism and reaction process of photocatalytic uranium extraction are investigated in the presence and absence of oxygen,respectively.

关键词： Bi_(2)O_(3)/g-C_(3)N_(4) Z-scheme photocatalytic uranium extraction

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腐蚀产物中Zn_(5)(OH)_(8)Cl_(2)对纯Zn腐蚀行为的影响

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表面技术 2024年第4期53卷 98-109,151页

作者：杨元成王友彬赵晋玮周佳顺冯济强高峰韦悦周广西大学省部共建特色金属材料与组合结构全寿命安全国家重点实验室南宁530004 广西大学资源环境与材料学院南宁530004 南华大学核科学技术学院湖南衡阳421001

目的探究纯Zn腐蚀产物中碱式氯化锌(Zn_(5)(OH)_(8)Cl_(2),ZHC)对其腐蚀防护性能的影响以及腐蚀防护机理。方法通过原位生长法在纯Zn表面制备一层ZHC膜。通过X射线光电子能谱仪(XPS)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)和能谱仪(ED... 详细信息

目的探究纯Zn腐蚀产物中碱式氯化锌(Zn_(5)(OH)_(8)Cl_(2),ZHC)对其腐蚀防护性能的影响以及腐蚀防护机理。方法通过原位生长法在纯Zn表面制备一层ZHC膜。通过X射线光电子能谱仪(XPS)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS),分析了样品的物相组成和微观形貌。通过电化学阻抗谱(EIS)和动电位极化曲线(Tafel),评估了ZHC膜对纯Zn腐蚀防护性能的影响。结果纯Zn表面先形成了一层致密细小的ZHC纳米片,铺满整个纯Zn表面后,在第一层ZHC上形成第二层较大尺寸的ZHC纳米片。预制备的ZHC膜可以使纯Zn的腐蚀电流密度从78.23μA/cm^(2)降低到2.08μA/cm^(2),腐蚀电位从‒1.050V(***)提升到‒0.998V(***),并且随着ZHC制备时间的增加,阴极斜率(βc)逐渐增大,这表明ZHC可以有效阻碍电荷转移,抑制阴极的氧还原,减缓纯Zn的腐蚀速率,对Zn基体的腐蚀起到防护作用。在浸泡腐蚀过程中,ZHC可以抑制HZ的生成,减少絮状腐蚀产物的生成。在短期浸泡过程中,纯Zn的阻抗值随着预制备ZHC的增加而逐渐增大,这是因为生成的腐蚀产物填补ZHC纳米片的空隙,使腐蚀产物膜致密,ZHC膜对Zn基体能起到较好的防护作用。在长期浸泡过程中,ZHC/Zn的阻抗值下降,这是因为ZHC膜破裂,提供了新的腐蚀通道,导致ZHC膜对纯Zn的防护作用下降。结论ZHC膜可以减缓纯Zn的腐蚀速率。对比纯Zn和ZHC/Zn在浸泡过程中的腐蚀行为可知,在短期浸泡过程中,随着预制备ZHC的增加,对纯Zn的防护性能逐渐提高;在长期浸泡腐蚀过程中,ZHC膜对纯Zn腐蚀的防护作用逐渐下降。

关键词：腐蚀产物 Zn_(5)(OH)_(8)Cl_(2) 纯Zn 原位生长腐蚀防护

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Influence of Sc Addition on Precipitation Behavior and Properties of Al-Cu-Mg Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 948-960页

作者： Xiangbin Han Shuangbao Wang Bo wei Shuai Pan Guizhen Liao weizhou Li yuezhou wei School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Key Laboratory of LCR Materials and Devices of Yunnan Province National Center for International Research On Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091China

In this study, the Al-5.10Cu-0.65 Mg alloys without and with 0.2 wt% Sc addition were prepared to unveil the effect of Sc on the precipitate behavior and properties by atomic-scale scanning transmission electron microscopy. The results show that addition of Sc is able to significantly suppress the formation of the peak-hardening θ’ and S precipitates but in favor of stabilizing Guinier–Preston–Bagaryatsky(GPB) zones during isothermal aging at 180 ℃. The generation of unique GPB precursors dictating the evolution of the subsequent peak-hardening GPB zones is highly correlated with the insufficient vacancies and dragging effect of Sc to Cu in the Al-Cu-Mg-Sc alloy, thereby restricting the nucleation of θ′ and S precipitates owing to the decreased available Cu solutes. In property, 0.2 wt% Sc addition can not only enhance the corrosion resistance but also the electrical conductivity of the peak-hardening alloy. In addition, the peak-hardening Al-Cu-Mg-Sc alloy is also featured with increased strength without losing the ductility compared to its solid solution state. Further analyses indicate that the improved properties are essentially attributed to the formation of densely distributed strain-free GPB zones and smaller precipitate-free zones. The obtained results could provide a potential design strategy of high-performance alloys by Sc addition.

关键词： Al alloy Micro-alloying Precipitation Atomistic mechanism Transmission electron microscopy

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地下水成分对钚化学种态分布的影响

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核技术 2024年第3期47卷 29-36页

作者：郑琦王帆张凡李聪陈立丰韦悦周南华大学核科学技术学院衡阳421001

钚是核能发展和放射性废物处理处置中的一种重要元素,其在天然水体中的种态分布对于研究其迁移行为至关重要。随着研究的深入,一些新的钚种态不断被发现和确认,原先诸多类似研究工作已经不能准确反映钚在溶液介质中的真实种态占比。结... 详细信息

钚是核能发展和放射性废物处理处置中的一种重要元素,其在天然水体中的种态分布对于研究其迁移行为至关重要。随着研究的深入,一些新的钚种态不断被发现和确认,原先诸多类似研究工作已经不能准确反映钚在溶液介质中的真实种态占比。结合最新热力学数据,本文通过地球化学计算软件PHREEQC系统研究了钚的种态分布随pH值和共存离子种类及浓度改变的变化规律,并得到了钚在不同水体中的物种形态占比。研究结果表明:在氧化性的地下水中,当水硬度比较低时,六价钚在酸性条件下主要以PuO_(2)^(2+)或PuO_(2)CO_(3)的形态存在,在中碱性条件下主要以PuO_(2)(CO_(3))_(2)^(2−)或PuO_(2)(CO_(3))_(3)^(4−)形态存在;然而,当水硬度比较高,尤其是钙离子浓度比较高时,六价钚虽然在酸性条件下仍主要以PuO_(2)^(2+)或PuO_(2)CO_(3)存在,在中碱性条件下却以CaPuO_(2)(CO_(3))_(3)^(2−)的形式占据主导地位。可见,水的硬度尤其是钙离子浓度是影响钚形态的重要因素之一,因而在钚的地质处置时应予以重点考虑。

关键词：钚化学种态 PHREEQC 地下水成分

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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 ***_(2)^(-)combines with Co(Ⅱ) to form an anion [Co(NO_(2))_(3)]^(-),and it is then extracted by *** 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/*** 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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Adsorption behavior of Me2-CA-BTP/SiO2-P adsorbent toward MA(Ⅲ) and Ln(Ⅲ) in nitrate solution

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Science China Chemistry 2016年第7期59卷 862-868页

作者： Shunyan Ning Qing Zou XinpengWang RuiqinLiu yuezhou wei School of Nuclear Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

A porous Me_2-CA-BTP/SiO_2-P adsorbent was prepared to separate MA(Ⅲ) from Ln(Ⅲ) in high level liquid waste(HLLW).The adsorption behavior of Me_2-CA-BTP/SiO_2-P toward ^(241)Am(Ⅲ) and Ln(Ⅲ) in 0.01 M HNO_3-NaNO_3 solution was ***_2-CA-BTP/SiO_2-P showed high adsorption and selectivity toward ^(241)Am(Ⅲ) over Ln(Ⅲ) fission products with the separation factor(SF) reaching to 557,2355,1952,1082,214,105,86,14 for Y,La,Ce,Nd,Sm,Eu,Gd and Dy respectively in 0.01 M HNO_3-0.99 M NaNO_3 *** adsorption kinetics of both Dy(Ⅲ) and Eu(Ⅲ) on Me_2-CA-BTP/SiO_2-P was studied and followed pseudo-second-order rate equation indicating chemical sorption as the rate-limiting step of the adsorption,and the adsorption isotherm of Dy(Ⅲ) and Eu(Ⅲ) matched better with the Langmuir isotherm than the Freundlich isotherm with the adsorption amount around 0.22 and 0.20 mmol/g *** study revealed that the adsorption of both Dy(Ⅲ)and Eu(Ⅲ) on Me_2-CA-BTP/SiO_2-P was spontaneous and endothermic processes with a positive entropy at 298,308,313 K.

关键词：吸附行为 III BTP 盐溶液吸附剂 CA 载体吸附等温线

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Adsorption behavior of Zr(IV) and Hf(IV) on a silica-based macroporous TODGA adsorbent

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Nuclear Science and Techniques 2013年第4期24卷 9-16页

作者： YIN Xiangbiao wei yuezhou ZU Jianhua School of Nuclear Science and Engineering Shanghai Jiao Tong University

In order to separate Zr(IV) and Hf(IV) in acidic solution,several kinds of silica-based macroporous adsorbents were *** adsorption selectivity for Zr(IV) and Hf(IV) in HCl solution was investigated,and the TODGA adsorbent for the two elements had the largest adsorption *** effects of acid type,HCl concentration,and temperature on the adsorption behavior of Zr(IV) and Hf(IV) onto the TODGA adsorbent were conducted by batch *** was found that H+exhibited a quite strong influence on adsorption capacity of Zr(IV) and Hf(IV).Isotherm fitting showed that the Langmuir model agrees well with the experimental *** thermodynamic parameters indicate that the adsorption processes for both elements are endothermic *** TODGA adsorbent had the higher adsorption selectivity for Zr(IV) over Hf(IV) and could be promising for their mutual separation.

关键词：大孔吸附剂吸附行为二氧化硅 Langmuir模型锆吸附选择性铪实验数据

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Adsorption behaviors of strontium using macroporous silica based hexagonal tungsten oxide

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Science China Chemistry 2016年第5期59卷 601-608页

作者： Xiaoxia Zhang Yan Wu Hao Wu yuezhou wei School of Nuclear Science and Engineering Shanghai Jiao Tong University

A novel macroporous silica-based hexagonal tungsten oxide(h-WO_3/SiO_2) with exchangeable sodium cations located in hexagonal tunnel structure was synthesized by a facile hydrothermal treatment of sodium tungstate dihydrate with 1 mol/L HCl solution. Utilization of the h-WO_3/SiO_2 adsorbent to remove aqueous strontium was investigated under the condition of various p H values, contact time, the initial concentration of metal ions, salt ion concentration, and coexisting ions. According to the experimental data, Sr^(2+) adsorption equilibrium was achieved within 15 min in acidic solution, and the maximum removal capacity of Sr^(2+) occurred at pH 4. The kinetic adsorption of Sr^(2+) on h-WO_3/SiO_2 was controlled by pseudo second-order model, and the saturated adsorption of Sr^(2+) on h-WO_3/SiO_2 was better described by Langmuir and Redlich-Peterson isotherm models compared with the Freundlich isotherm model. The distribution coefficient of Sr^(2+) was more than 2000 cm^3/g in the presence of Ca^(2+), Mg^(2+), La^(2+), and Eu^(2+), indicating that the h-WO_3/SiO_2 showed excellent selectivity towards Sr^(2+) in pH 4.

关键词：二氧化硅吸附行为氧化钨大孔等温线模型六方 SiO2 锶

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Mechanism for nucleation and growth of electrochemical deposition of palladium(II) on a platinum electrode in hydrochloric acid solution

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Science China Chemistry 2014年第5期57卷 755-762页

作者： GU Shuai WANG XinPeng wei yuezhou FANG BaiZeng School of Nuclear Science and Engineering Shanghai Jiao Tong University Department of Chemical & Biological Engineering University of British Columbia

Palladium(II)and chloride ions tend to form complexes in aqueous *** theoretical and experimental(by UV spectrum)results indicate that there are four complexes formed in aqueous solution containing 3 mol/L hydrochloric acid and 20mmol/L *** work evaluates the kinetics of electrochemical deposition of palladium on a Platinum *** this purpose,palladium electrodeposition was investigated by means of cyclic voltammetry(CV),potentiostatic current-time transients(CTTs)and Tafel *** CTTs curves,the regions corresponding to the charge transfer control,mixed control and diffusion control were *** the diffusion control region,palladium electrodeposition mechanism was characterized as progressive nucleation with three-dimensional(3D)growth under diffusion control;as for the mixed control region,an adsorption(IAds),ion transfer(IIT),and nucleation and growth(ING)model were proposed to analyze the current-time transients quantitatively,which could separate the IAds,IIT and ING perfectly.

关键词：电化学沉积盐酸溶液钯电极铂电极成核电沉积机理机制扩散控制

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