JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 319
·期 3
·805-815
·
IF 1.181
Xiong Xiao Hong,Yuan Ya Hong,Huang Bin,He Min,Chen Huai,Luo Yi Chao,Zhu Ye An,Luo Tai An,Chen Quan Shui
Ti(OH) 4 and TiCl 4 modified bentonite (Ti–Na-bent) were applied in the removal of Th(IV) from aqueous solution. Effect of different factors such as pH, contact time, temperature, initial concentration of Th(IV) and efficiency of them for thorium adsorption are investigated. Ti–Na-bent showed high adsorption capacity (q m = 231.37 mg/g) and quick adsorption kinetics at lower pH. The adsorption mechanisms involved are: (1) Th 4+ , [Th(OH) 4− n ] n + complexed on the outer-sphere of Na-bent and Ti–Na-bent. (2) Ion exchange between Th 4+ , [Th(OH) 4− n ] n + and exchangeable cations of Na-bent and the H on the hydroxyl group of Ti(OH) 4 . Ti–Na-bent manifested high adsorption capacity for Th(IV), good acid resistance and long-term adsorption stability.
研究领域:
环境化学
·
放射化学
·
吸附科学
·
水处理
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Mingyang Liu,Dan Zou,Donghai Yu,Shaoji Xiang,Yuefeng Deng,Ji Chen,Jichang Xiao
Cyanex923 (a mixture of four trialkyl (hexyl and octyl) phosphine oxides) has been extensively employed in the recovery of cerium (Ce(IV)) and fluorine (F), as well as the separation over thorium (Th(IV)) from bastnaesite. However, rigorous production conditions and involvement of highly toxic raw materials (PH 3 ) have been critical problems to be solved during the synthesis of Cyanex923. Meanwhile, its extraction performance remains to be improved. Therefore, we attempted to adjust the feed ratio to increase the proportion of short carbon chain components, successfully synthesized a novel extractant (P113, a mixture of four trialkyl (hexyl and octyl) phosphine oxides) with contents of each component different from Cyanex923 using an environmentally benign method. The comparison with Cyanex923 revealed obvious improvement of P113 in terms of extraction efficiency, selectivity and saturation capacity. The extraction efficiency and saturation capacity of Ce(IV) were increased by 10% and 10 g L -1 , respectively. Separation factor of Ce(IV)/Th(IV) was increased from 16 to 27 at 2 mol L -1 H 2 SO 4 . Furthermore, P113 presented excellent regenerability. The superiority of P113 was theoretically explored using the density functional theory (DFT) and polarizable continuum model (PCM), and the results indicated that THPO (trihexyl phosphine oxide) had lower extraction phase transfer energy than TOPO (trioctyl phosphine oxide) from aqueous phase to organic phase. The comprehensive evaluation of P113 demonstrated the feasibility employed in the recovery of Ce(IV)-F and the separation of Th(IV) from bastnaesite, which advanced industrial application of the novel extractant, and held significant value for the utilization of resources and environmental protection.
研究领域:
化学工程
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环境科学
·
材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·
IF 12.2
Wei Xu,Qingguo Chen,Junyi Wu,Xiaofeng Zhao,Tongzhou Xu,Wanjun Zhang,Yuancheng Teng,Lang Wu,Shanlin Wang,Liang Bian,Zheng Xie,Rajeev Ahuja,Wei Luo,Weipeng Wang,Zhengjun Zhang
Rhabdophane has an outstanding capacity of accommodating radioactive nuclides and is recognized as a significant host phase for the enrichment of actinides from radioactive waste liquid. Thus, assessing the impact of impurities present in such waste streams on rhabdophane crystallization is critical. This study systematically investigates the effects of Fe3+/Fe2+ coincorporation with actinides on the precipitation behavior of rhabdophane. Some specific issues, including lattice occupation of Fe3+, precipitation reaction kinetics, crystal growth affected under the influence of trace iron, and leaching stability, are discussed in detail. The results reveal that the presence of Fe3+, rather than Fe2+, can lower the energy barrier for nucleation and accelerate the transformation of Th-rich nucleus into rhabdophane. The limited uptake of Fe3+ with a suggested substitution ratio below 1%, contributes to establishing the stability domain of the rhabdophane phase, whereas excess Fe3+ promotes the formation of the FePO4·2H2O phase, which synergistically enhances the grain growth kinetics of rhabdophane/monazite through an aggregation–adsorption effect. Based on density functional theory of structural energetics, Fe3+ occupation is energetically favorable at nonhydrated [LaO8] sites in rhabdophane, despite the fact that two-thirds of lattice sites are associated with [LaO8·H2O] sites. Intriguingly, amorphous FePO4·2H2O can act as active sites to facilitate the formation of a surface alteration layer with improving the leaching stability of Th4+ in pH = 5–7 solutions.
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高影响因子
Solar RRL
·
2022
·Vol. 6
·期 6
·2200101
·
IF 9.173
Han Li,Hongkang Gong,Mengjie Sun,Huimin Zhang,Chao Ji,Chunjun Liang,Fangtian You,Xiping Jing,Xiangfei Kong,Zhiqun He
A donor–acceptor (D–A)-type discotic organic material (TP-2-PIE), having a self-organization ability, is selected to be the third component blending with poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene - co-3-fluorothieno [3,4-b]-thiophene-2-carboxylate] (PTB7-Th): [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM) in ternary bulk-heterojunction polymer solar cells. The complementary absorption and energy transfer between TP-2-PIE and PTB7-Th contributes to the enhancement in photocurrent generation, improving the short-circuit current. In addition, TP-2-PIE alters the molecular interaction leading to an enhanced phase separation, which promotes carrier transport with a good balance and minimizes the density of trap states simultaneously. In this way, the overall photovoltaic performances are markedly enhanced at an optimal condition of 10 wt% TP-2-PIE in donors with a 12.6% efficiency increase. Current understanding on the functionality of this third component in ternary solar cells may be able to guide future device development.
研究领域:
材料科学
·
光伏技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Ning Pan,Jianguo Deng,Debin Guan,Yongdong Jin,Chuanqin Xia
Reduced graphene oxide (RGO) prepared by the reduction of graphene oxide (GO) using thiourea dioxide (TUD) was examined for the adsorption of Th(IV) from aqueous solutions. The adsorption of Th(IV) on RGO as a function of pH, contact time, adsorbent dosage, the Th(IV) initial concentration and temperature was investigated through batch adsorption experiments. The results showed that the adsorption behavior of Th(IV) on RGO followed the pseudo-second order kinetic and the Langmuir isotherm models. The maximum theoretical adsorption capacity was calculated to be 0.21 mmol Th/g RGO at 298.15 K. Moreover, the thermodynamic parameters (Δ H 0 = 4.32 kJ/mol, Δ S 0 = 69.47 J/mol K and Δ G 0 = −16.39 kJ/mol at 298.15 K) indicated that the adsorption process was a feasible, spontaneous and endothermic in nature.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Duo Jiang,Li Liu,Ning Pan,Fuqiang Yang,Shengke Li,Ruibing Wang,Ian W. Wyman,Yongdong Jin,Chuanqin Xia
The separation of Th(IV)/U(VI) is of great importance in the development of thorium-based reactors. Here, we report our studies of Th(IV)/U(VI) separation by graphene oxide (GO). Firstly, variation of media conditions such as the pH, contact time, ionic strength, as well as the presence of different anionic ligands were conducted. The results showed that GO exhibited great selectivity for Th(IV) and the separation factor of Th(IV)/U(VI) reached as high as 36.3 after 2 h of contact at pH 3.8 and minimum ionic strength, and increasing the ionic strength caused the separation factor of Th(IV)/U(VI) to decrease. The presence of sulfate strongly influenced the separation factor of Th(IV)/U(VI) by GO. Secondly, competitive adsorption studies, as well as SEM–EDS, XRD, FT-IR, and XPS characterization were employed to gain further understanding of the mechanism of GO’s selective complexation of Th(IV)/U(VI). FT-IR and XPS characterizations showed that GO adsorbed Th(IV)/U(VI) through coordination of functional groups such as C O and C O on GO. The results of the competitive adsorption studies suggested that GO had a selective affinity for Th(IV) over U(VI). SEM–EDS exhibited a uniform distribution of both Th(IV) and U(VI) on GO. XRD indicated that the interlayer distances of the prepared GO, GO–Th(IV), GO–U(VI), and GO–Th(IV)/U(VI) were 8.24, 8.20, 7.86, and 8.26 Å, respectively. These results suggested that the adsorption of U(VI) caused a decrease of the interlayer distance of GO, which is probably inhibits GO’s ability to adsorb metal ions due to increased inter-planar repulsion and induced steric hindrance that limits adsorption of more metal ions. Therefore, a spatial feature based mechanism of GO was proposed.
研究领域:
核化学
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环境化学
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材料科学
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放射化学
·
分离科学
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DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2019
·
IF 2.547
Shilin Jiang,Kui Liu,Yalan Liu,Taiqi Yin,Zhifang Chai,Weiqun Shi
The electrochemical behavior of Th(IV) on a bismuth electrode in LiCl–KCl eutectic was investigated by various electrochemical techniques , aiming at in-depth elucidation of basic electrochemical and thermodynamic properties of Th in molten salt . The results of cyclic voltammetry and coulometric titration indicated that the reduction of Th(IV) on a liquid Bi electrode occurred at −0.92 V (vs. Ag/AgCl) and was a one-step process with four electrons transferred. In addition, thermodynamic properties of Th in liquid Bi medium were evaluated by coulometric titration method in the temperature range from 723 to 798 K. The redox peaks of Bi 2 Th intermetallic compound were detected at −1.13 and −1.05 V, and the corresponding Gibbs free energy of formation was measured by open circuit chronopotentiometry (OCP). Finally, galvanostatic electrolysis (GE) was conducted on a liquid Bi electrode to extract Th from molten salt at 773 K. X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) were applied to characterize the composition and morphology of the products, and revealed the formation of Bi 2 Th intermetallic compound.
研究领域:
电化学
·
材料科学
·
核能工程
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Dong Ma,Cheng Wang,Wenlong Xu,Shiyu Jia,Fangfang Qi
A novel shear thickening gel with micro-scale hard/soft interface structure and low reaction temperature was proposed in this article. The gel was named TH and used as core material within Kevlar fabrics. Storage modulus of TH was proved to increase by around two orders with increasing of shear frequency, and dynamic properties indicated that TH could dissipate or store more energy. TH can adhere with Kevlar fabrics well and satisfactorily fulfill the gap between fabrics. As a result, shock wave peak pressure and positive impulse decreased markedly. Wavelet decomposition analysis show that high frequency energy was filtered by protection materials. Meanwhile, impact resistance test suggested the existence of TH changed the stress propagation routes and avoided pulling out for Kevlar fabrics. Samples filled with TH demonstrated a better shock wave mitigation ability and impact resistance. Energy dissipation structures with TH have a promising prospect in the application of defending area.
研究领域:
材料科学
·
机械工程
·
复合材料
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Wei Xu,Qingguo Chen,Wanjun Zhang,Xiaofeng Zhao,Weipeng Wang
The rhabdophane–monazite system has been proposed as a promising material for the immobilization of actinides from radioactive waste streams due to its potential for lower processing costs. Assessing the influence of impurities present in such waste streams on monazite properties is therefore critical, particularly given that rhabdophane precipitation is frequently accompanied by the co-formation of FePO 4 ·2H 2 O as a common secondary phase. This study systematically investigates the effects of Fe 3+ incorporation on the sintering behavior and chemical stability of monazite ceramics, with particular focus on the solubility limit of Fe 3+ and the diffusion dynamics of the molten FePO 4 phase. The results reveal that trace amounts of Fe 3+ (up to 2 mol%) can be incorporated into the monazite lattice at 1200 °C via solid-state diffusion during grain growth. When the Fe 3+ doping level exceeds 2 mol%, excess FePO 4 seg = regates at grain boundaries, leading to microcrack formation and significant reductions in density and hardness. Furthermore, leaching experiments demonstrate that Fe 3+ doping below 2 mol% increases the leaching rate of Th 4+ . In contrast, the presence of a secondary FePO 4 phase (>2 mol%) at grain boundaries promotes preferential dissolution, thereby accelerating localized corrosion and the co-leaching of Th 4+ and La 3+ .
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 322
·期 2
·553-559
·
IF 1.186
Wu Peng,Wang Yun,Li Yang,Hu Xuewen,Xiu Taoyuan,Yuan Dingzhong,Liu Yan,Wu Zhenyu,Liu Zhirong
In order to reduce the potential toxicity to the environment after treatment of radioactive waste water, an eco-friendly graphene oxide nanoribbons/chitosan (GONRs-CTS) composite was prepared and utilized for adsorption of Th(IV) from aqueous solution. The GONRs-CTS adsorbent was characterized by XRD, FTIR and SEM, indicating that GONRs-CTS contains a large amount of oxygen-containing groups and chitosan was successfully attached to the GONRs surface. The Th(IV) adsorption on GONRs-CTS was endothermic and spontaneous, with the maximum single layer adsorption capacity was 140.6 mg g −1 at pH = 3.0, in the contact time of 12 h. The adsorption process was consistent with pseudo-second-order kinetics and the Langmuir isotherm model.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 10
·3903-3910
·
IF 1.6
Zheng RuoChen,Mao GuoShu,Fu Zhihai,Zhang Xian,Yu ShengJie,Yue Yuanzhen,Li Jiayun
A new poly(4-vinylpyridine) resin was prepared and characterized. The adsorption of Th 4+ on resin was studied as a function of contact time, nitric acid concentration, metal ion impurity and initial Th 4+ concentration. The adsorption kinetics and isotherms were analyzed. The results revealed that the adsorption equilibrium for the adsorption of Th 4+ on resin was reached within 30 min. The efficiency of Th 4+ adsorption on resin improves when the nitric acid acidity increases. The adsorption capacity of the resin increases with an increase in the initial concentration of Th 4+ . The thorium distribution coefficient increases with metal nitrate in the system.
研究领域:
化学工程
·
环境科学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 1
·253-263
·
IF 1.371
Zhou Weini,Wang Hongqing,Hou Sanying,Wang Shiyv
A magnetic nano-composites Fe 3 O 4 @SiO 2 @MnO 2 were fabricated for efficient removal of Th(IV) from aqueous solutions, and characterized by SEM, TEM, XRD, FT-IR, BET, VSM, TGA and XPS. And the sorption of Th(IV) on Fe 3 O 4 @SiO 2 @MnO 2 were investigated as a function of pH, adsorbent dosage and initial Th(IV) concentration. The results showed that the adsorption maximum was 53.19 mg g −1 for Th(IV) at pH = 3.5 and T = 298 K. In addition, the adsorption kinetics followed the second-order kinetic model, and the adsorption isotherm could be perfectly depicted by the Langmuir model. Finally, XPS analysis illustrated that the lattice oxygen (M–O) and the surface hydroxyl oxygen (M–OH) participated in adsorption. In brief, the Fe 3 O 4 @SiO 2 @MnO 2 material could efficiently eliminate Th(IV) from aqueous solutions, which might become a promising material for adsorbing Th(IV) from environmental wastewater.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
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