KERNTECHNIK
·
2023
·Vol. 88
·期 5
·556-565
·
IF 0.5
Qifeng Jiang,Weigang Liu,Yuxin Liao,Haonan Li,Junhan Li,Jiahui Feng,Zimin Zhang,Yuzhen Sun,Yuxin Chen,Jiachen Guo,Xuebin Su,Rong Hua
Bentonite exhibits obvious geological characteristics in different areas, and its chemical composition varies. To investigate the impact of these variations on the adsorption of Se(IV), the chemical structures and elemental contents of three types of bentonites were characterized using FTIR and XRF. By conducting a series of experiments and fitting the results with the kinetic adsorption model and the isothermal adsorption model, it was discovered that bentonite exhibits diverse adsorption modes for Se(IV). In acidic environments, the adsorption mode primarily involves forming an outer-sphere complex, whereas in neutral and alkaline environments, the primary mode is to form an inner-sphere complex. Zhi-Shin bentonite, which has low alumina content and high iron oxide content, demonstrates poor adsorption effectiveness on Se(IV) at low temperatures (less than 45 °C), but exhibits good adsorption effectiveness at high temperatures (more than 50 °C). Conversely, bentonite with high alumina content and low iron oxide content demonstrates the opposite effect. Furthermore, for bentonite with high iron oxide content, Se(IV) will form more inner-sphere complexes with iron oxide, and the adsorption behavior is not easily affected by changes in ionic strength and pH.
研究领域:
环境科学
·
地质学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 324
·期 2
·903-911
·
IF 1.137
Wu Hao,Huang Wei,Duan Zhiqin,Luo Mingbiao,Wang Zhifen,Hua Rong
For the first time in laboratory, diffusion parameters of Se(IV) in the clay of Chinese Tamusu region(TMS clay) against compacted density, ionic strength and pH value were obtained by capillary method. Diffusion process can be Simplified by using one-dimensional semi-infinite medium diffusion model. The results show a good similarity with the international literature and meet the internationally recognized range of 10 −9 –10 −12 . This work will provide data support and theoretical references for the pre-selection of clay rock sites in China’s high-level radioactive waste deep geological repository.
研究领域:
环境科学
·
地质学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 1
·149-158
·
IF 1.371
Sun Yuzhen,Zhang Hui,Lee Chuan-Pin,Luo Mingbiao,Hua Rong,Liu Weigang,Kong Jie,Hu Yanqin
For the first time in laboratory, the diffusion behavior of Se(IV) in Tamusu clayrock core was studied by means of through-diffusion method. The effects of pH, ionic strength and humic acid on the diffusion behavior of Se(IV) in clayrock were studied. The effective diffusion coefficient, distribution coefficient and rock capacity factor value were obtained. The diffusion mechanism of radionuclide in Tamusu clayrock is discussed, which can provide experimental data support and theoretical references for the pre-selection of clayrock sites and safety assessment in China’s high-level radioactive waste deep geological repository.
研究领域:
放射生物学
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地质学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 328
·期 2
·717-725
·
IF 1.371
Kong Jie,Lee Chuan-Pin,Sun Yuzhen,Hua Rong,Liu Weigang,Wang Zhifen,Li Yang,Wang Yudan
Quantitative calculation based on the joint action of anion exclusion and sorption has not been reported. This article studies the diffusion behavior of Se(IV) in MX-80 bentonite fills in different lengths by the through-diffusion method. The anion exclusion and sorption are simultaneously considered and quantitatively calculated. The results show that the effective diffusion coefficient of Se(IV) decreases with the increasing lengths of bentonite plug, because of the joint action of anion exclusion and sorption. On this basis, the anion exclusion and sorption are first quantitatively calculated, then a new theory for calculation is proposed in this article. The calculation results show that the ratio of anion exclusion and sorption. In groundwaterenvironments and seawaterenvironments, the weight of sorption is lower than anion exclusion in diffusion process.
研究领域:
环境科学
·
地质学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 5
·2311-2317
·
IF 1.754
Wu Tao,Geng Zilong,Feng Zhengye,Pan Guoxiang,Shen Qiang
The diffusion of Re(VII), Se(IV) and Cr(VI) in compacted Gaomiaozi bentonite was conducted by an integrated diffusion setup. The effective diffusion coefficient and the rock capacity factor of Re(VII), Se(IV) and Cr(VI) were measured. Re(VII) and Cr(VI) were excluded from the surface of bentonite particles with an accessible porosity of 0.40 and 0.23. The geometric factor decreased in a sequence of Cr(VI) < Se(IV) < Re(VII), indicating that Cr(IV) had a lower tortuosity, a larger diffusion pore diameter, and a stronger anionic exclusion effect from the surface of bentonite platelets.
研究领域:
环境科学
·
地球化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Tao Wu,Zhifen Wang,Hai Wang,Zhiqiang Zhang,Luc R. Van Loon
The through-diffusion method was employed to investigate the effect of the salt concentration on the diffusion behaviour of Re(VII) and Se(IV) in compacted bentonite . The accessible porosity , ε acc , of Re(VII) increased from 0.25 to 0.38 with an increase of the ionic strength from 0.1 to 1.0 mol/L. The dependency of the accessible porosity ε acc on the salt concentration could be described approximately by a first-order decay exponential function. The interlayer porosity of GMZ bentonite was 21% of the total porosity at a bulk dry density of 1600 kg/m 3 at 12 °C. The D e values of Re(VII) and Se(IV) increased from 2.6 × 10 − 11 to 6.1 × 10 − 11 m 2 /s and from 1.6 × 10 − 11 to 4.7 × 10 − 11 m 2 /s in GMZ bentonite with an increase of the ionic strength from 0.1 to 1.0 mol/L, respectively. In the case of Se(IV), the adsorption showed a different ionic strength dependency in GMZ bentonite and montmorillonite . The ionic strength has no significant effect on the adsorption (K d = 1.8 × 10 − 4 m 3 /kg) on GMZ bentonite, indicating the formation of inner-sphere surface complexes. In the case of synthetic montmorillonite, the K d values increased with increasing ionic strength. This can be explained by the fact that the electric potential of surface sites becomes less negative with increasing ionic strength resulting in an increase in the adsorption of Se(IV) at a pH above the point of zero salt effect (PZSE). The D e values of both Re(VII) and Se(IV) increased with increasing salt concentration. Both anions are totally excluded from the interlayer space and partially from the diffuse double layer. Ionic strength alters the effective diffusion coefficient of anions by controlling the thickness of the diffuse double layer. Anion diffusion data from the literature (effective and apparent diffusion coefficients) were satisfactorily evaluated by Archie's relation.
研究领域:
环境科学
·
地球化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 5
·2273-2280
·
IF 1.5
Zhang Hui,Wang Ju,Wu Wangsuo,Luo Mingbao,Hua Rong,Zhou Zhichao,Ling Hui
This paper presents the first laboratory-based, simultaneous diffusion experiments of Re(VII) and Se(IV) in Tamusu (TMS) clay, using the capillary method. We determined diffusion coefficients ( D a ) and adsorption values ( K d ) for these nuclides under varying clay compaction densities, solution pH values, ionic strengths, and in the presence of humic acid (HA). The results indicated rapid acquisition of diffusion data, the D a values predominantly ranging from 10 −9 m 2 /s to 10 −10 m 2 /s, and weak adsorption for both Re(VII) and Se(IV). While the presence of HA augmented the D a and K d values for Re(VII) and Se(IV) diffusion in clay, these values did not exhibit significant alterations in response to increasing HA concentrations.
研究领域:
环境科学
·
地质学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Jing Xiong,Kailai Xu,Xiandeng Hou,Peng Wu
The excellent fluorescence property of Au nanoclusters (AuNCs) has received great attention for various chemosensing and biorelated applications, but the sample matrix is still an important problem that causes undesirable fluorescence variation. On the one hand, hydride generation (HG) is an effective strategy to separate the target analyte from the complex sample matrices, but the implementation of HG with AuNC-based fluorescent assays was not realized. On the other hand, due to the ultrasmall size of AuNCs and good catalytic performance of Au, AuNCs are also featuring intriguing catalytic applications. Herein, we proposed a new type of AuNC-based fluorescence assay for Se(IV) detection, in which hydride generation of Se(IV) was coupled with the fluorescence/catalytic dual functions of AuNCs. In a batch hydride generation mode, Se(IV) was first converted to volatile H2Se. When it spread in the headspace to contact with AuNCs supported paper, AuNC-catalyzed oxidation of H2Se by O2 to yield elemental selenium occurred, which further deposited on the surface of AuNCs to induce fluorescence quenching. The catalytic effect of AuNCs was studied in depth via both experimental and theoretical (density functional theory) investigations. Three main steps for H2Se oxidation were identified, with energy barriers in the presence of AuNCs significantly lower than those without. Benefiting from the reduced matrix interference by hydride generation and the unique catalysis/fluorescence of AuNCs, the proposed assay featured high selectivity, good sensitivity, and simplicity, with successful applications for selenium detection in real samples.
研究领域:
分析化学
·
纳米科技
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Yang Liu,Xiaowen Zhang,Fashuai Yang,Cuili Xing,Peng Fan,Yuankui Sun,Xiaohong Guan
Zero-valent aluminum (ZVAl) shows promise for environmental remediation, yet its decontamination performance under circumneutral conditions remains debated. To unravel this paradox, we employed Se(IV) and nitrate (NO 3 − ) as model pollutants to probe how contaminant-specific modulation of Al 2 O 3 transformation dictates ZVAl performance across pH 0 2.0–11.0. Results revealed that Se(IV) sequestration exhibited U-shaped kinetics with minimum efficiency at pH 0 4.0–7.0 (5.8–14.2 %), whereas NO 3 − reduction displayed an inverted U-shaped trend with maximum efficiency (> 95 %) obtained in the same pH range. Mechanistic studies demonstrated that these contrasting trends originate from pollutant-mediated Al 2 O 3 evolution. Specifically, Lewis-basicity-dependent competition for Al 2 O 3 surface sites dictates whether hydration or dissolution dominates activation. Se(IV), acting as a strong Lewis base, inhibited Al 2 O 3 hydration by competing with OH − for Al 2 O 3 surface sites and/or forming passivating Al-O-SeO 3 2− complexes , thereby self-limiting its own removal. Conversely, NO 3 − with weak Lewis basicity negligibly affected Al 2 O 3 hydration to form porous Al(OH) 3 , which can enhance electron transfer by reducing interfacial charge transfer resistance. This work resolves the long-standing pH limitation paradox in ZVAl systems by elucidating the role of Al 2 O 3 evolution, thereby offering a mechanistic framework for the design of adaptive metal-based remediation technologies.
研究领域:
环境修复
·
材料化学
·
表面化学
·
污染物去除
·
机理研究
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 11
·1-14
·
IF 5.3
Qiu Suyan,Dong Yifan,Ai Qiushuang,Yuan Lijuan,Yu Xiren,Liang Jingtian,Zhang Li,Xiang Jianjun,Zhang Dawen
We present a novel Se(IV)-mediated etching protocol to control the etching orientation and geometrical evolution of bare gold nanorods (AuNRs) and exploit it as a highly sensitive surface-enhanced electrochemiluminescence (ECL) sensor. The initial etching orientation was intimately governed by the concentrations of Se(IV) and cetyltrimethylammoniumbromide (CTAB). Interestingly, an extraordinary lateral etching was preferentially observed in the Se(IV)/KI/CTAB system, leading to the formation of quasi-rectangular AuNRs with increased aspect ratio. This etching process afforded clear geometrical transformation, enabling the efficient synthesis of cubic gold nanoparticles and quasi-rectangular nanorods with an enhanced electric-field enhancement factor. The etched AuNRs immobilized on a glassy-carbon electrode produced a markedly enhanced ECL signal 4.42-fold higher than that of the unetched AuNRs. A detection limit as low as 9.24 pM was achieved for the p53 biomarker carrying a codon-249 mutation. Moreover, the method yielded a lower selectivity factor than previously reported strategies, highlighting its high selectivity and potential for discriminating mutant p53 DNA. Our study significantly advanced current p53 sensor capabilities and highlighted the power of etched plasmonic metasurfaces for sensitive optical detection. Graphical abstract
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产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2023
·
IF 6.8
Chengke Fu,Yichao He,Chengyun Yang,Jieyu He,Luna Sun,Yixin Pan,Liping Deng,Rui Huang,Manli Li,Kaikai Chang
Selenium (Se) as an essential nutrient for human beings at trace concentrations, the allowable concentration for the human is only 40 μg/L. Iron sulfide (FeS) nanoparticles have been applied for excessive of selenium (Se) remediation in surface water and groundwater. In this study, FeS nanoparticles were anchored onto biochar (BC) to reduce agglomeration of FeS and prepared into the composite of FeS-BC by pyrolysis to economically and efficiently remove Se(IV) from simulated wastewater based on the excellent performance of FeS and the low cost of BC. Characterizations presented the uniform anchorage of FeS on the BC surface to prevent agglomeration. The results of batch experiments revealed that the removal of Se(IV) by FeS-BC nanomaterials significantly depended on the pH value, with the maximum removal of ∼174.96 mg/g at pH 3.0. A pseudo-second-order kinetic model well reflected the kinetic removal of Se(IV) in pure Se(IV) solution with different concentration, as well as the coexistence of K + , Ca 2+ , Cl - , and SO 4 2- ions. The presence of K + ions significantly inhibited the removal of Se(IV) with the increase of K + ion concentration compared with the effect of the other three ions. SEM-EDS and XPS analyses indicated that the removal process was achieved through adsorption by surface complexation, and reductive precipitation of Se(IV) into Se 0 with the electron donor of Fe(II) and S(-II) ions. The FeS-BC nanomaterial exhibited an excellent application prospect in the remediation of Se(IV).
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2018
·Vol. 5
·期 6
·1441-1453
·
IF 6.087
Jingmiao Wei,Wei Zhang,Weiyi Pan,Chaoran Li,Weiling Sun
Adsorption behaviors and mechanisms of selenite [Se(IV)] and selenate [Se(VI)] on two types of zirconium metal–organic frameworks (MOFs, UiO-66 and UiO-66-NH2) were investigated using batch experiments, spectroscopic analyses, and theoretical calculations. Se(IV) adsorption was substantially greater than Se(VI) adsorption. Intriguingly, with increasing solution pH, Se(IV) adsorption increased to a maximum at pH 7, whereas Se(VI) adsorption monotonically decreased. Se(IV) adsorption was not influenced by coexisting ions except for PO43−, whereas Se(VI) adsorption was in general decreased with increasing coexisting ion concentrations. The underlying molecular binding mechanisms were elucidated via zeta potential, XPS, and FTIR analyses as well as density functional theory calculations. Se(IV) formed a strong inner-sphere complex with the MOFs via Lewis acid/base complexation between the Zr coordinatively unsaturated sites and HSeO3− or SeO32− (−59.4 to −142 kJ mol−1) and hydrogen bonding between Zr–O–C and H2SeO3 (−24.4 to −29.8 kJ mol−1). Se(VI) formed outer-sphere complexes with the MOFs through electrostatic interactions (−50.6 to −62.1 kJ mol−1). Thus, the BET surface area was the predominant factor determining the Se(IV) adsorption, whereas both the surface charge and BET surface area controlled the Se(VI) adsorption. This study provided new insights on the molecular interactions between Se(IV) and the MOFs, and revealed the distinct differences between the Se(IV) and Se(VI) adsorptions.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）