MINERALS ENGINEERING
·
2022
·
IF 5.479
Haiping Zhao,Xiaopeng Niu,Bingxu Dong,Xianbing Jia,Renman Ruan
This work aims to establish the quantitative relationship between the surface oxidation state of pyrite and flotation performance. In this paper, an efficient method was proposed to prepare pyrite with different oxidation degrees. Flotation tests show that the floatability of pyrite decreased with prolonging the oxidation time. Tof-SIMS results reveal that the main component on the oxidized pyrite surface is Fe hydroxides or oxides. XPS analysis confirms that Fe(OH) 2 and FeOOH are the main formula of Fe species, and the ratio of Fe 2+ /Total Fe agrees well with the floatability of pyrite with different oxidation degrees, which can be taken as an index to develop the flotation performance of pyrite. DFT simulation calculation further demonstrates the reliability of Fe(OH) 2 as the active site. This study provides essential surface chemistry evidence for correlating the surface species with the floatability of pyrite with different oxidation states through quantitative analysis of various intermediate products.
研究领域:
矿物加工
·
表面化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Peicheng Huang,Weichun Yang,Varney Edwin Johnson,Mengying Si,Feiping Zhao,Qi Liao,Changqing Su,Zhihui Yang
The contamination of soils by mercury (Hg) seriously threatens the local ecological environment and public health. S-functionalized amendments are common remediation technology , yet, Hg re-activation often occurs in the commonly used immobilization remediation by S-functionalized amendments, resulting in an unsatisfactory remediation effect. In this study, a novel FeS–Se functionalized biochar composite (FeS-Se-BC) amendment was prepared and applied for the efficient remediation of Hg-polluted soil. An immobilization efficiency of 99.62% and 99.22% for H 2 O-extractable Hg and TCLP solution-extractable Hg was achieved with the application of FeS-Se-BC (0.05) after 180 d. The analyses of XPS, Hg-TPD, SEM-EDS demonstrated that excellent remediation performance by FeS-Se-BC resulted from the synergistic effect of FeS and Se to form HgS and HgSe concurrently. In comparison to the treatments of biochar and FeS-functionalized biochar (FeS-BC), FeS-Se-BC promoted the transformation of exchangeable, carbonate-bound, and Fe–Mn oxides-bound Hg fractions into organic material-bound, and residual fractions, effectively reducing the risk of Hg-contaminated soil from a highly dangerous level to a low risk. Furthermore, the introduction of Se clearly inhibited the re-activation of Hg and reduced the release of Hg by 81.12% compared to FeS-BC when the ratio of S 2− to Hg was 5: 1 due to the formation of extremely stable HgSe. These results suggest that FeS-Se-BC has good potential for remediation of Hg-polluted soils which provides a new inhibitory idea for Hg re-activation after immobilization.
研究领域:
环境科学
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土壤修复
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 30
·21799-21807
·
IF 3.9
Yijin Sheng,Fangxu Hu,Yu Wu,De Li,Wenting Ji,Yong Chen
The electrochemical oscillation in Li-ion batteries has been reported for two-phase electrode materials of Li4Ti5O12 and LiCrTiO4, which is originated from the group-by-group phase transition in a multi-particle electrode. For both Li4Ti5O12 and LiCrTiO4, the electrochemical oscillation exhibits usually during charging, while rarely for discharging. Herein, a series of Zr-modified Li4Ti5O12 samples are prepared by using the spray-drying combined with high-temperature sintering method, and the electrochemical oscillation is observed during not only the charging process, but also the discharging process, which gradually grows up and then disappears by increasing the Li content. Compared with Li4Ti5O12, the specific capacity of Zr-modified Li4Ti5O12 decreases gradually by increasing the Zr/Ti ratio, owing to the impurity phases. According to the XRD, XPS and STEM results, the Zr element tends to accumulate on the surface to form ZrO2 nanoparticles, rather than dope into the bulk phase of Li4Ti5O12, which makes Li4Ti5O12 particles well dispersive. In contrast to the Li deficiency for only charging, the electrochemical oscillation during both charging and discharging should be attributed to the Li excess, but too much Li2TiO3 phase will suppress the electrochemical oscillation. Therefore, the Li excess can induce the electrochemical oscillation during both charging and discharging of Zr-modified Li4Ti5O12, which can be adopted to investigate the electrochemical oscillation of other materials in LIBs.
研究领域:
材料科学
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电化学
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电池技术
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Xin Miao,Yunxin Shi,Liying Wang,Zhenzhu Cao,Yongfeng Zhang,Shaohua Luo
Hollow Co/CoO@NSCO nanospheres were synthesized via solvothermal derivation from dual-ligand Co-MOF, followed by controlled calcination. The calcination-temperature-mediated tuning of Co/CoO ratios and oxygen vacancy concentrations significantly enhanced lithium storage performance. Optimized Co-450 (450 °C calcination) delivered exceptional reversible capacities of 1112.5 mAh g −1 at 0.2 A g −1 after 100 cycles and 605.6 mAh g −1 at 1 A g −1 after 1000 cycles. Ex situ XRD confirmed metallic Co's role as an electrochemically inactive conductive matrix, while oxygen vacancies (65.7 % by XPS) facilitated rapid Li + diffusion. Kinetic analysis revealed hybrid charge storage: capacitive effects (68 % contribution at 1 mV s −1 ) dominated by pseudocapacitance from Co 2+ /Co 3+ redox couples, complemented by diffusion-controlled processes. The hierarchical hollow structure accommodated volume changes, and heteroatom-doped carbon enhanced electronic conductivity. This work demonstrates calcination-driven phase engineering as a viable strategy for high-performance anodes.
研究领域:
材料科学
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电化学
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纳米技术
·
储能
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2025
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IF 5.2
Israr Masood ul Hasan,Li Bo,Niu Zhengrong,Gao Dandan,Zhang Yaoling,Muhammad Bilal Shakoor,Muhammad Zubair Nawaz,Yuyu Liu,Jinli Qiao,Nabeel Khan Niazi,Haitao Feng
Use of biowastes for biochar production is an eco-friendly and cost-effective approach for the removal of arsenic (As) from water. However, low adsorption capacity of raw biochar could be a main concern for its practical application. Thus, we explored arsenite (As(III)) sorption to pristine pine cone biochar (PCBC), populous leaf biochar (PLBC) and nano zero-valent zinc-modified PCBC and PLBC (nZVZn-PCBC and nZVZn-PLBC) in aqueous solutions and naturally As-contaminated salt lake water. Biochars were characterized by advanced microscopic and spectroscopic techniques to delineate their surface morphology, chemical properties, and elemental composition. Sorption mechanism was investigated using X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy, which indicated that As(III) adsorption mainly controlled by porous structure and ligand exchange of –OH ions on Zn–OH by forming Zn–O–As(III) complexes. The nZVZn-PCBC possessed a higher porous structure and exhibited higher sorption (2.87 mg g −1 , 96 %) in contrast to pristine PCBC (1.95 mg g −1 , 65 %) at pH 7. For sorption kinetics, pseudo-second-order adsorption has given a higher R 2 = 0.99 value. Langmuir isotherm model well-described (R 2 = 0.98) As(III) sorption on nZVZn-PCBC. The nZVZn-PCBC efficiently removed As (84 %) from naturally As-contaminated salt lake water in the presence of co-occurring competing anions. In short, biochar modification with nano zero-valent zinc showed that As can be removed effectively from synthetic as well as real salt lake water.
研究领域:
环境科学
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水处理
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纳米技术
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吸附
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 12
·期 3
·737-749
·
IF 6.119
Zhicheng Xu,Yuran Li,Yuting Lin,Bin Wang,Panting Gao,Tingyu Zhu
The reduction of NO by CO was proposed to be applied for regeneration gas to remove NOx from industrial flue gas with activated carbon purification technology. To improve the activity and sulfur resistance for the reduction of NO by CO in regeneration gas, Cu and Fe modifications on activated carbon were investigated. And various samples were characterized by XRD, XPS, TPD, H2-TPR, in situ DRIFTS and DFT calculations to explain the reaction mechanism and poisoning mechanism. The synergistic effects of oxygen-containing functional groups and metal sites show that –COOH acts as an anchor site for metals and that C–O–C acts as a protective site for Fe3+ under a SO2 atmosphere. Cu2+ sites have a high activity at low temperatures due to the large amount of adsorbed NO and the intermediate NOx− participating in the reaction with the NOx− pathway. Fe3+ sites have a high activity at high temperatures due to the high N–O dissociation activity with the *N pathway and –NCO pathway. DFT calculations proved that the binding Cu2+ and Fe3+ sites have higher activity than free Cu2+ and Fe3+ sites. A high content of SO2 exhibits various poisoning effects, mainly including the sulfation of metal sites, deposition of S, and consumption of CO. AC-Fe-H exhibits excellent resistance and stability against SO2 and H2O due to less S deposition caused by consumption through the S–CO reaction, slight sulfation caused by the protective effect of Fe2+ and C–O–C on Fe3+ sites and better hydrophobicity.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·22073-22086
·
IF 0
Wang Youqun,Cai Weiqian,Xiong Lingshan,Pei Jiaying,Zhang Zhibin,Xu Lin,Liu Yunhai,Cao Xiaohong
Inspired by its large specific surface area, and tunable chemical and physical properties, a hollow carbon-based mater8ial derived from ZIF-8 with phosphate groups (HCM-PO 4 ) was prepared for the elimination of U(VI). The structural and surface features of HCM and HCM-PO 4 were thoroughly examined using techniques such as SEM, TEM, and XRD. The resulting carbon material, HCM-PO 4 , exhibits a higher BET surface area of 571.2 m 2 ·g -1 , featuring a hollow structure. The removal procedure of HCM-PO 4 for U(VI) aligns with the quasi-secondary kinetic model. Furthermore, the theoretical sorption capacity of HCM-PO 4 was found to be 482.30 mg·g -1 at 298.15 K. The results obtained from XPS, FT-IR, and EDS analysis of HCM-PO 4 after adsorption revealed the coordination of the phosphate group for U(VI), contributing significantly to the adsorption process. In brief, the HCM-PO 4 demonstrates excellent adsorptive ability, positioning it as a hopeful expectant to remove U(VI) from wastewater.
研究领域:
环境科学
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材料科学
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核废物处理
·
吸附技术
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yang Zhao,Yi He,Siming Yan,Changhua Li,Hongjie Li,Wen Chen,Jing Yan,Guiyang Wu,Xi Yuan
Owing to the increasingly stringent environmental regulations, eco-friendly waterborne epoxy (WEP) coating currently gets much attention as an alternative choice of traditional coating. But the intrinsic problems of WEP, including poor barrier property and lack of long-term anticorrosion performance, was a limitation for its application. Herein, α-zirconium phosphate (α-ZrP) was prepared and exfoliated under mild condition. Then α-ZrP after exfoliation was functionalized by eco-friendly phytic acid (PA) molecular and a novel nano-filler (PZ) was obtained. The test results of the XRD , FTIR, SEM, TEM and XPS indicated that the preparation of nano-materials was successful. Through the EIS test, the outstanding barrier property of WEP incorporating with PZ was proved. Moreover, the excellent long-term anticorrosion performance of WEP incorporating with PZ was also proved by the salt spray test .
研究领域:
材料科学
·
涂层与薄膜
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环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Baoping Zhang,Heng Zhang,Yin Wang,Shiyuan Fang
Amine/quaternary ammonium lignin for adsorption of tungsten was synthesized by amination and quaternization from lignin. The adsorbent was characterized by SEM-EDS and FTIR. The effects of pH, initial concentration of tungsten, adsorption time and dosage of adsorbent on the adsorption effect were investigated. The adsorption mechanism was revealed by SEM-EDS and FTIR and XPS. The results showed that amine/quaternary ammonium lignin was loose and rough and contained a large number of phenolic hydroxyl and amine and quaternary ammonium functional groups. Using the optimum conditions, which included the pH of 4.0 and initial tungsten concentration of 800 mg·L −1 and adsorption time of 960 min, the saturated adsorption capacity of 1 g·L −1 amine/quaternary ammonium lignin for tungsten reached 421.68 mg·g −1 . The adsorption followed Langmuir model and quasi-second-order kinetic model, indicating that the adsorption was monolayer homogeneous chemisorption. When the total concentration of tungsten was 0.005 mol·L −1 and the value of pH was smaller than 4.7, H 2 W 12 O 40 6− was the existing form of tungsten and was adsorbed by electrostatic attraction of hydrogen bond and coordination with amino and ion exchange with Cl − .
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Min Zhang,Xue Zhao,Yunyuan Dong,Chenyao Hu,Xiaokang Xiang,Xiantao Zeng,Junhao Jia,Chen Jin,Liang Ding,Xiaobin Chen
The development of green and efficient photocatalytic materials for the treatment of medical and industrial wastewater has become a current research focus. In this work, the CeO 2 /Zn 0.4 Cd 0.6 S heterojunction with a special 0D/1D morphology was synthesized by a soft chemistry method. The successful construction of the heterojunction was verified by the binding energy migration of XPS and TEM . The photocatalytic activities were determined by photoreduction of hexavalent chromium ions (Cr VI ) and photodegradation of tetracycline hydrochloride (TC). The experimental results showed that the loading of CeO 2 significantly improves the photocatalytic performance of Zn 0.4 Cd 0.6 S, and the loading of 10 wt% CeO 2 has the best photocatalytic activity and structural stability. The S-scheme electron transport mechanism was particularly investigated through active species trapping experiments. This work provides an effective idea for the design of highly stable metal sulfide photocatalysts .
研究领域:
环境科学
·
材料科学
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Zheyu Huang,Jingzhong Kuang,Tingsheng Qiu,Mingming Yu
Metal-phenolic networks (MPNs) offer a promising, environmentally compatible strategy for cleaner, more efficient tungsten resource utilization due to their tunable structures and efficient interfacial regulation. This paper investigates the structural regulation effect of a self-assembled Fe(Ⅲ)-tannic acid (TA) MPN, formed through the coordination of TA and Fe 3 + , on the flotation separation of scheelite and calcite. The adsorption mechanisms were elucidated through contact angle, adsorption capacity, zeta potential and XPS analyses, while TEM, UV–vis spectroscopy and DFT calculations were employed to probe the micro- and coordination structures. The results demonstrated that the Fe(Ⅲ)-TA MPN formed at pH= 4 with TA:Fe= 1:1/2 exhibited minimal inhibition of scheelite but strong suppression of calcite, yielding a tungsten concentrate with a WO 3 grade of 71.35 % and recovery of 86.94 %. This behavior was attributed to the formation of a mono-coordination network (Fe:TA=1:1), which adsorbed onto both mineral surfaces through Fe-mediated interactions. In contrast, the tris-coordination network (Fe:TA=1:3) displayed the highest intrinsic reactivity but was limited by Fe(OH) 3 colloid deposition, hindering collector adsorption. The bis-coordination network (Fe:TA=1:2) remained stable over pH= 3–8 and selectively adsorbed on calcite via synergistic electrostatic attraction, hydrogen bonding, and chemical bonding, forming stable hydrophilic films. However, strong electrostatic repulsion hindered Fe(Ⅲ)–TA MPN adsorption on scheelite, thus maintaining its floatability. This study elucidates the structure-function relationship of Fe(III)-TA MPNs, offering new perspectives for designing environmentally friendly inhibitors for selective tungsten flotation.
研究领域:
矿物加工
·
表面化学
·
配位化学
·
环境化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2025
·
IF 5.5
Si-Ming Qi,Zuo-Hu Zhou,Fang-Fang Liu,Ze-Qi Yu,Jian Wei,Ai-Bing Yang,Hui-Fang Zhao,Ni Zhen,Lei Zhang
Comprehensive Summary Extreme ultraviolet (EUV) lithography is a key technology for sub-7 nm nodes semiconductor manufacturing but faces challenges due to low energy conversion efficiency and weak sensitivity of photoresists. Antimony (Sb)-based materials have attracted increasing attention for their high EUV absorption cross-section. Herein, through a fluorine modification strategy, we functionalized a Sb 2 -oxo cluster with tailored carboxylic acid ligands to achieve dual-tone photoresist control. Crucially, fluorinated ligands induced positive- tone patterning with enhanced sensitivity, while the non-fluorinated ligand decorated Sb 2 -oxo cluster maintained conventional negative-tone behavior. Combined X-ray photoelectron spectroscopy (XPS) analysis, UV-vis absorption spectroscopy analysis, and theoretical calculations highlight the potential of fluorine to alter the inherent cross-linking mechanisms. This work not only enriches the examples of metal oxo cluster based positive photoresists but also provides an effective approach to manipulating photoresist polarity at the molecular level.
研究领域:
材料科学
·
半导体制造
·
纳米技术
·
光刻技术
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）