VACUUM
·
2025
·
IF 3.9
Zhuo Li,Huiling Du,Nan Kong,Na Cao,Kemeng Hu,Lan Yang,Xian Du
Carbon dioxide conversion represents a highly promising carbon reduction strategy, and photocatalytic conversion technology, characterized by greenness, non-toxicity, and sustainability, holds significant importance. However, enhancing CO 2 adsorption on photocatalysts and improving charge carrier separation efficiency remain substantial challenges. In this study, based on MIL-101, we designed a highly interconnected TiO 2 @MIL-101 bifunctional heterojunction by in-situ compositing TiO 2 on its surface through Ti-O-Cr bonding, aiming to achieve in-situ adsorption and conversion of carbon dioxide. This composite photocatalyst exhibits enhanced photocatalytic activity, with an average CO production rate of 35.39 μmol h −1 g −1 and a CH 4 production rate of 13.81 μmol h −1 g −1 . Compared to unmodified MIL-101 (Cr), these values are increased by 1.25-fold and 2.8-fold, respectively. Experimental results combined with DFT calculations demonstrate that the porous structure and high specific surface area of MIL-101 facilitate the diffusion of CO 2 on the photocatalyst surface and improve interfacial reaction kinetics. The synergistic effect between Ti-O-Cr bonds and the built-in electric field within the highly interconnected heterojunction accelerates the directional transfer of charge carriers at the heterointerfaces, effectively promoting the catalytic conversion of carbon dioxide.
研究领域:
材料科学
·
光催化
·
环境化学
·
二氧化碳利用
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DOI
高影响因子
Sustainable Materials and Technologies
·
2025
·
IF 9.2
Zhe Wang,Hongru Hao,Yushi Feng,Dmitry Sergeevich Tsvetkov,Zhe Lv,Lingling Xu,Bo Wei
The performance and stability of solid oxide fuel cell (SOFC) cathodes are severely limited by chromium poisoning. To address these concerns, we designed and investigated A-site two high-entropy perovskite oxides, which possess equivalent configuration entropy but distinct elemental compositions. Compared to the conventional double perovskite PrBaCo 2 O 5+δ (PBC), the PBSLSC cathode demonstrated superior oxygen reduction reaction activity, while PBSNGC showed inferior performance. Crucially, both high-entropy cathodes exhibited significantly enhanced resistance to chromium poisoning, as evidenced by the suppressed formation of SrCrO 4 and Co 3 O 4 secondary phases. This improved Cr-tolerance is due to high-entropy sluggish diffusion effect, which mitigates the segregation of Ba/Sr and cobalt elements. Our findings demonstrate that while configurational entropy is critical, the specific elemental composition is a decisive factor in determining cathode activity. This work establishes high-entropy engineering as a powerful strategy for developing highly active and Cr-tolerant cathodes for intermediate-temperature SOFCs.
研究领域:
材料科学
·
能源工程
·
电化学
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 40
·期 1
·e70473
·
IF 0
Fuhua Wei,Anhui Huang,Qinhui Ren,Min Li,Wei Shang,Diaodiao Zhang,Zhao Liang
In this research, GO/Cu/Cr-MOF composites were fabricated via a dissolution-heat method. The GO/Cu/Cr-MOF composite was characterized using FT-IR, SEM, XRD, and EDS techniques. The characterization results confirmed the presence of Cu and Cr metallic elements in the composite, and FT-IR analysis demonstrated that the organic ligands were successfully coordinated with the metal centers. The characterized GO/Cu/Cr-MOF composite was employed in the removal study of fleroxacin and levofloxacin. The results demonstrate that the addition of 40 mg of the composite to a 40-ppm levofloxacin solution achieved a removal efficiency of 95.9% within 5 h. Likewise, adding the same amount of composite to a 20-ppm fleroxacin solution resulted in a maximum removal efficiency of 98.2% over the same time period. The experimental data were examined using both the kinetic model and the isotherm models. The results revealed that the adsorption of both antibiotics onto the GO/Cu/Cr-MOF composite followed the pseudo-second-order kinetic model and was most accurately represented by the Langmuir isotherm. The experimental results indicate that the adsorption capacity of the GO/Cu/Cr-MOF composite for fleroxacin and levofloxacin reaches its maximum within the pH range of 6 and 8.
研究领域:
环境科学
·
材料化学
·
吸附技术
·
水处理
·
金属有机框架材料（MOFs）
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产品关联
DOI
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jialin Niu,Yulong Xiang,Xiaoli Dong,Yu Wang,Nan Zheng,Pei Yu
Hexavalent chromium in industrial wastewater poses a serious threat to ecosystems. Photocatalytic technology has been seen as a promising strategy for removing heavy metal ions. Construction of heterostructures offered a promising strategy to enhance the separation efficiency of photogenerated carriers, thereby improving photocatalytic performance. Herein, ZnWO 4 /UiO-66-NH 2 heterostructures were synthesized by a two-step hydrothermal method. The synthesized samples were systematically characterized via a variety of techniques, alongside an exploration of the associated photocatalytic mechanism. ZnWO 4 /UiO-66-NH 2 -2 exhibited an exceptional photocatalytic performance, attaining a 97 % degradation of hexavalent chromium within 60 min, approximately 1.3 and 4.7 times that of UiO-66-NH 2 and ZnWO 4 , respectively. The transient photocurrent response, photoluminescence (PL), and electrochemical impedance spectroscopy (EIS) results indicate that constructing heterostructures can effectively accelerate the migration of electrons while simultaneously suppressing the recombination process of photogenerated carriers. In addition, Active species trapping experiments revealed that the photogenerated electrons were the main active substances in photoreduction reaction. This study offers an effective strategy for photocatalytic reduction of hexavalent chromium.
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Peng Liao,Binrui Li,Lin Xie,Xiaoao Bai,Han Qiao,Qianqian Li,Biwei Yang,Chongxuan Liu
Engineered nanoparticles-mediated contaminant transport has been recognized as a significant process governing the mobility of metals and radionuclides in groundwater. Engineered silicate nanoparticles (ESNPs) are attractive materials for the sequestration or extraction of Cr(VI) and other metals and radionuclides from groundwater. While great efforts have been devoted toward the application of these materials for Cr(VI) sequestration, the underlying interface adsorption mechanism is not thoroughly elucidated. This study investigates the immobilization mechanisms of Cr(VI) on a representative ESNPs, NH 2 -MCM-41, over a range of water chemistry conditions. By combining batch adsorption experiments with an array of complementary characterizations, we provided spectroscopic and microscopic evidence that the electrostatic interactions between the positively charged NH 2 -MCM-41 surface derived from amino functionality and the negatively charged Cr(VI) species was the dominant mechanism responsible for Cr(VI) immobilization. In addition, the weak hydrogen bonding interactions may also contribute to adsorption to a degree. Furthermore, thermodynamic studies suggested a favorable, spontaneous, and exothermic adsorption process. Site energy analysis illustrated that the distribution of energy binding sites on NH 2 -MCM-41 is Cr(VI) loading dependent. The new insights provided here can advance understanding of the transport of Cr(VI) associated NH 2 -MCM-41 that benefits the application of ESNPs-based technologies for metals immobilization in groundwater.
研究领域:
环境科学
·
纳米技术
·
污染治理
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DOI
PubMed
高影响因子
Frontiers of Environmental Science & Engineering
·
2021
·Vol. 15
·期 6
·1-12
·
IF 4.357
Meng Fanling,Xia Yunxue,Zhang Jianshuai,Qiu Dong,Chu Yaozhu,Tang Yuanyuan
Chromium slag usually contains various heavy metals, making its safe treatment difficult. Glass-ceramic sintering has been applied to resolve this issue and emerged as an effective method for metal immobilization by incorporating heavy metals into stable crystal structures. Currently, there is limited knowledge about the reaction pathways adopted by multiple heavy metals and the co-stabilization functions of the crystal structure. To study the Cu/Cr co-stabilization mechanisms during thermal treatment, a simulated system was prepared using a mixture with a molar ratio of Al 2 O 3 :Fe 2 O 3 :Cr 2 O 3 : CuO = 1:1:1:3. The samples were sintered at temperatures 600–1300°C followed by intensive analysis of phase constitutions and microstructure development. A spinel phase (CuFe x Al y Cr 2− x − y O 4 ) started to generate at 700°C and the incorporation of Cu/Cr into the spinel largely complete at 900°C, although the spinel peak intensity continued increasing slightly at temperatures above 900°C. Fe 2 O 3 /Cr 2 O 3 was more easily incorporated into the spinel at lower temperatures, while more Al 2 O 3 was gradually incorporated into the spinel at higher temperatures. Additionally, sintered sample microstructures became more condensed and smoother with increased sintering temperature. Cu / Cr leachability substantially decreased after Cu/Cr incorporation into the spinel phase at elevated temperatures. At 600°C, the leached ratios for Cu and Cr were 6.28% and 0.65%, respectively. When sintering temperature was increased to 1300°C, the leached ratios for all metal components in the system were below 0.2%. This study proposes a sustainable method for managing Cu/Cr co-exist slag at reasonable temperatures.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2020
·Vol. 231
·期 2
·1-12
·
IF 1.9
Zeng Ganning,Hong Chunxian,Zhang Yan,You Hanzhang,Shi Wenyue,Du Mingming,Ai Ning,Chen Bing
A novel polymer/activated carbon composite was prepared in this study by one-step chemical activation of Sargassum horneri , followed by surface modification with chitosan, a widely abundant biopolymer. The prepared composite was used as adsorbent to remove one of the most toxic metal ions, Cr(VI), from aqueous solution. Surface characterization tests revealed the material to be predominantly mesoporous with the specific surface area of 293.4 m 2 ·g −1 and the average pore diameter of 6.27 nm. Enhanced uptake capacity of Cr(VI) by the prepared composite was obtained due to the presence of more metal-binding functional (amino and hydroxyl) groups on its surface. Extremely fast adsorption rate of Cr(VI) was also achieved due to the porous structure of the prepared composite. This study has clearly shown that Sargassum horneri can be a potential alternative precursor for carbon-based adsorbents and the proper designed polymer/AC composites can be tailor-made adsorbents for heavy metal removal.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Zhuan-nian Liu,A.-ping Fan,Xiao-gang Han,Habiba Shapour,Qing-yun Zhang
The chelating adsorbent PEI-MIL-101(Cr) was prepared by introducing polyethyleneimine (PEI) into the MIL-101(Cr) channel in this paper. X-ray diffractometer, Fourier transform infrared spectrometer and scanning electron microscope were applied to characterize the structure and morphology of MIL-101(Cr) and PEI-MIL-101(Cr). The adsorption properties and mechanism of the MIL-101(Cr) and PEI-MIL-101(Cr) to Cr(VI) were studied. The results showed that adsorption capacity of PEI-MIL-101(Cr) for Cr(VI) was obviously better than MIL-101(Cr). The adsorption isotherm of Cr(VI) onto MIL-101(Cr) and PEI-MIL-101(Cr) can be described by Langmuir model. The maximum adsorption amount for Cr(VI) onto MIL-101(Cr) and 30% PEI-MIL-101(Cr) was 61.99 and 40.34 mg/g. The adsorption kinetic data of the two adsorbents followed the pseudo second-order model. The negative values ΔH and ΔG illustrate that the process is spontaneous and exothermic. PEI-MIL-101(Cr) can be reused for four times.
研究领域:
环境化学
·
材料科学
·
污染控制
·
吸附技术
·
功能材料
·
水污染治理
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Ruinan Wang,Shuang Ni,Gang Liu,Xiaoxiang Xu
In this work, we have applied microstructure management and doping techniques to conventional wide band gap semiconductor CaTiO 3 with the aim to improve its light absorption and photocatalytic activity. A series of La/Cr co-doping hollow CaTiO 3 cubes have been successfully prepared by a template-free hydrothermal method. Their crystal structures, microstructures, optical absorption and photocatalytic hydrogen production have been systematically investigated. Our results suggest that hollow CaTiO 3 owns a higher light absorption than solid one and demonstrates a much better photocatalytic activity both under full range (λ ≥ 250 nm) and visible light illumination (λ ≥ 400 nm). These improvements probably originate from the peculiar hollow microstructures that increase photon-matter interactions and shorten the charge migration pathways. The photocatalytic activity for hydrogen production has been further studied by varying the La/Cr content in CaTiO 3 . An optimal doping point at 5% La/Cr doping level has been reached for full range illumination with apparent quantum efficiency approaching ∼2.41%. Nevertheless, the activity under visible light illumination shows a clear dependence on doping level with highest apparent quantum efficiency ∼0.40% at 20% La/Cr doping level. DFT calculations reveal the critical role of Cr in forming a new spin-polarized valence band inside the original band gap of CaTiO 3 therefore is responsible for band gap reduction and visible light photocatalysis. This work here highlights the importance of microstructure control to the photocatalytic performance and shall shed a light on the design and development of efficient photocatalytic materials/systems.
研究领域:
材料科学
·
光催化
·
能源化学
·
无机功能材料
·
半导体物理
·
纳米结构材料
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Yuxuan Zhang,Jun Luo,Xiuyan Wang,Dunhan Zhang,Hongxia Xu,Yuanyuan Sun,Xueyuan Gu,Xin Hu,Bin Gao,Hongqiang Ren
MXenes, such as Ti 3 C 2 T x , demonstrate tremendous potential as heavy metal adsorbents due to their abundant reaction sites, high hydrophilicity , controllable interlayer spacing, and inherent reduction ability. However, their structural dependent pollutant removal performances and the related mechanisms are far less studied. Therefore, the removing abilities of Cr(VI) from water on Ti 3 C 2 T x MXenes with different structures (multilayer (ML-) and delaminated (DL-) Ti 3 C 2 T x ) synthesized via several etching techniques were evaluated. Focusing on the most effective ML- and DL-Ti 3 C 2 T x obtained by acid/fluoride salt etching, the impacts of structural variations on the Cr(VI) removal performances were explored. Both ML- and DL-Ti 3 C 2 T x demonstrate outstanding Cr(VI) adsorption and reduction capabilities, achieving equilibrium within 500 min with capacities of 92.7 and 205 mg/g, respectively. The differences in removal mechanisms stemed from the varying adsorption and reduction capacities of two MXenes. ML-Ti 3 C 2 T x , with lower surface area and porosity, had low adsorption capacity but superior reduction ability, efficiently converting most Cr(VI) to Cr(III) (66.8%). Conversely, DL-Ti 3 C 2 T x exhibited better removal efficiency but a lower capacity for reduction (45.7%). Notably, although the partial reduction of DL-Ti 3 C 2 T x to TiO 2 results in its limited chemical reduction capacity, Ti 3 C 2 T x might serve as a co-catalyst for TiO 2 , boosting the photoresponsiveness of DL-Ti 3 C 2 T x or TiO 2 through Ti 3 C 2 T x /TiO 2 heterojunctions , thereby facilitating photocatalysis to realize the reduction of Cr(VI). Both Ti 3 C 2 T x exhibited both excellent Cr(VI) removal capacity and detoxification capacity, demonstrating their high potential in treating heavy metal pollutants in wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
水处理
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DOI
高影响因子
POLYMER COMPOSITES
·
2016
·Vol. 39
·期 5
·1507-1513
·
IF 2.004
Xin Tuo,Bingrui Li,Xianghua Yu,Changlian Chen,Zhiliang Huang,Hong Cao,Yineng Huang,Liang Li
The magnetic polypyrrole (PPy) composite nanofibers are prepared in a simple one-pot method via in situ chemical polymerization of pyrrole in the presence of methyl orange, followed by the treatment of ammonia solution. The effect of methyl orange (MO) on the morphology of the magnetic PPy nanocomposites was investigated. The composite nanofibers were used as an efficient adsorbent to remove Cr(VI) from aqueous solutions. Moreover, because of the magnetic Fe 3 O 4 nanoparticles in the composites, it is easy for the composites to be separated from waste water by external magnet. These composites with hierarchical structures are expected to be a potential candidate for water treatment. POLYM. COMPOS., 39:1507–1513, 2018. © 2016 Society of Plastics Engineers
研究领域:
材料科学
·
环境工程
·
高分子化学
·
纳米技术
·
水处理
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 82
·期 3
·492-502
·
IF 1.638
Wei Jinyu,Hu Huayu,Zhang Yanjuan,Huang Zuqiang,Liang Xingtang,Yin Yanzhen
In this work, a user-friendly chitin-based adsorbent (CT-PmPD) was synthesized by in-situ polymerization of m-phenylenediamine on chitin bead, which could effectively remove Cr(VI) from water. The structure and morphology of the CT-PmPD were characterized by FT-IR, XRD, SEM, zeta potential and XPS. Specifically, the effect of adsorbed dosage, pH, contact time, adsorption temperature and coexisting salt on the adsorption of Cr(VI) were studied. Besides, the adsorption mechanism of CT-PmPD toward Cr(VI) were also analyzed. Consequently, CT-PmPD exhibited a monolayer adsorption and the Langmuir model fitted a Cr(VI) adsorption capacity reaching 185.4 mg/g at 298 K. The high adsorption capacity was attributed to the abundant amino groups of CT-PmPD, which could be protonated to boost the electrostatic attraction of Cr(VI) oxyanions, thus providing electron to reduce Cr(VI). Additionally, the CT-PmPD revealed a good regeneration and reusability capacity, maintaining most of its adsorption capacity even after five cycles of adsorption-desorption. This high adsorption capacity and excellent regeneration performance highlighted the great potential of CT-PmPD for the removal of Cr(VI).
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DOI
高影响因子
危险品化学品经营许可证（带存储）