NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 11
·9006-9015
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IF 3.201
Huating Sun,Tianxing Wu,Yunxia Zhang,Dickon H. L. Ng,Guozhong Wang
Molybdenum disulfide (MoS2) was successfully synthesized via a facile one-step hydrothermal method without addition of templates or surfactants. The obtained MoS2 product was characterized via various techniques including FESEM, HRTEM, XRD, BET and XPS analyses. Their application in capturing Cr(VI) ions in water was investigated. The results showed that the MoS2 nanosheets were ultrathin with a thickness of 5–10 nm and had a uniform lateral size of 100–200 nm. Impressively, these MoS2 nanosheets not only possessed enlarged interlayer spacing, but also had multiple defects on the basal planes, which were proved to be crucial in the removal of Cr(VI). The kinetics of chromium adsorption was found to follow the pseudo-second-order rate equation and the adsorption isotherm data were well fitted to the Langmuir model with a chromium in-take capacity of about 84.03 mg g−1. This structure-enhanced removal was likely related to the synergism of adsorption and reduction, in which the anionic Cr(VI) was adsorbed on the surface of D-MoS2via electrostatic interaction. At the same time, some fraction of the adsorbed Cr(VI) was reduced to low toxic Cr(III) and the generated Cr(III) species were adsorbed by the adsorbent. More significantly, the adsorption and reduction processes not only transferred the Cr(VI) from the aqueous environment to the surface of solid adsorbents but also alleviated the toxicity of Cr(VI). It was evident that this study may promote the application of other transition metal dichalcogenides in environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Zhiyan Yan,Chenrui Liu,Yun Liu,Xiaoqian Tan,Xinyue Li,Yan Shi,Chunlian Ding
Cr(VI) contaminated water usually contains other contaminants like engineered nanomaterials (ENMs). During the process of microbial treatment , the inevitable interaction of Cr(VI), ENMs, and microorganisms probably determines the efficiency of Cr(VI) biotransformation , however, the corresponding information remains elusive. This study investigated the interaction of ZnO nanoparticles (NPs), Cr(VI), and Pannonibacter phragmitetu s BB (hereafter BB), which changed the process of microbial Cr(VI) reduction. ZnO NPs inhibited Cr(VI) reduction, but had no effect on bacterial viability. In particular, Cr(VI) induced BB to produce organic acids and to drive Zn 2+ dissolution from ZnO NPs inside and outside of cells. The dissolved Zn 2+ not only promoted Cr(VI) reduction to Cr(V)/Cr(IV) by strengthening sugar metabolism and inducing increase in NAD(P)H production, but also hindered Cr(V)/Cr(IV) transformation to Cr(III) through down-regulating Cr(VI) reductase genes. A novel bacterial driven ROS scavenging mechanism leading to the inhibition of Cr(VI) reduction was elucidated. Specifically, the accumulated Cr(VI) and Cr(V)/Cr(IV) formed a redox dynamic equilibrium, which triggered the disproportionation of superoxide radicals mimicking superoxide dismutase through the flip-flop of Cr(VI) and Cr(V)/Cr(IV) in bacterial cells. This study provided a realistic insight into design the applicability of biological remediation technology for Cr(VI) contaminant and evaluating environmental risks of ENMs.
研究领域:
环境科学
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微生物学
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纳米技术
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生物修复
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Guang Tian,Falin He,Xiangxiang Li,Shaoyang Hu,Xingchen Zhao,Shuqi Guo,Tingting Wang,Hao Wang,Wansong Zong,Rutao Liu
Chromium (Cr) poses a high ecological risk, however the toxic mechanisms of Cr in different valence states to soil organisms at cellular and molecular levels are not exactly. In this study, the Eisenia fetida coelomocytes and Cu/Zn-superoxide dismutase (Cu/Zn-SOD) were chosen as the target subjects to investigate the effects and mechanisms of cellular toxicity induced by Cr(VI) and Cr(III). Results indicated that Cr(VI) and Cr(III) significantly reduced the coelomocytes viability. The level of reactive oxygen species (ROS) was markedly increased after Cr(VI) exposure, which finally reduced antioxidant defense abilities, and induced lipid peroxidation and cellular membrane damage in earthworm coelomocytes. However, Cr(III) induced lower levels of oxidative stress and cellular damage with respect to Cr(VI). From a molecular perspective, the binding of both Cr(VI) and Cr(III) with Cu/Zn-SOD resulted in protein backbone loosening and reduced β-Sheet content. The Cu/Zn-SOD showed fluorescence enhancement with Cr(III), whereas Cr(VI) had no obvious effect. The activity of Cu/Zn-SOD continued to decrease with the exposure of Cr. Molecular docking indicated that Cr(III) interacted more readily with the active center of Cu/Zn-SOD. Our results illustrate that oxidative stress induced by Cr(VI) and Cr(III) plays an important role in the cytotoxic differences of Eisenia fetida coelomocytes and the binding of Cr with Cu/Zn-SOD can also affect the normal structures and functions of antioxidant defense-associated protein.
研究领域:
环境毒理学
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分子生物学
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生态毒理学
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DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 11
·3761
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IF 3.748
Lei Wu,Doudou Qin,Fan Fang,Weifeng Wang,Wenying Zhao
Severe environmental pollution is caused by the massive discharge of complex industrial wastewater. The photocatalytic technology has been proved as an effective way to solve the problem, while an efficient photocatalyst is the most critical factor. Herein, a new photocatalyst MIL-68(Ga)_NH2was obtained by hydrothermal synthesis and were characterized by PXRD, FTIR,1H NMR, and TGA systematically. The result demonstrates that MIL-68(Ga)_NH2crystallized in orthorhombic system andCmcmspace group with the unit cell parameters:a= 36.699 Å,b= 21.223 Å,c= 6.75 Å,V= 5257.6 Å3, which sheds light on the maintenance of the crystal structure of the prototype material after amino modification. The conversion of Cr(VI) and binary pollutant Cr(VI)/RhB in wastewater under visible light stimulation was characterized by the UV-vis DRS. Complementary experimental results indicate that MIL-68(Ga)_NH2exhibits remarkable photocatalytic activity for Cr(VI) and the degradation rate reaches as high as 98.5% when pH = 2 and ethanol as hole-trapping agent under visible light irradiation with good reusability and stability. Owing to the synergistic effect between Cr(VI) and RhB in the binary pollutant system, MIL-68(Ga)_NH2exhibits excellent catalytic activity for both the pollutants, the degradation efficiency of Cr(VI) and RhB was up to 95.7% and 94.6% under visible light irradiation for 120 min, respectively. The possible removal mechanism of Cr(VI)/RhB based on MIL-68(Ga)_NH2was explored. In addition, Ga-based MOF was applied in the field of photocatalytic treatment of wastewater for the first time, which broadened the application of MOF materials in the field of photocatalysis.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2012
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IF 4.555
Liang Zhao,Yin Jin,Zhangwei Yan,Yuanyuan Liu,Hongjun Zhu
A simple, rapid, sensitive and field-portable colorimetric technique for the determination of Cr(III) in aqueous solution based on an aggregation-induced color transition of gold nanoparticles (AuNPs) has been developed. AuNPs were first functionalized with a dithiocarbamate-modified N -benzyl-4-(pyridin-4-ylmethyl)aniline ligand (BP-DTC). Chelation of Cr(III) by several of these ligands, bound to different nanoparticles, led to nanoparticle aggregation in solution. This gave rise to a color change from wine-red to blue that was discernible by the naked eye and an easily measurable alteration in the extinction spectrum of the particles. The method could be used to determine Cr(III) with a detection limit of 31 ppb. Furthermore, selective detection of trace Cr(III) in aqueous solution in the presence of 12 other transition metal ions has been achieved. Toward the goal of practical applications, the sensor has been further evaluated with a view to monitoring Cr(III) in nutritional supplements and the blood of diabetes patients and also applied in the indirect determination of Cr(VI) in waste water.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Cuili Xing,Xinyi Yao,Kaiwei Zheng,Yang Liu,Yuankui Sun,Xiaohong Guan
Efficient removal of recalcitrant Cr(III)-organic complexes is always challenged by slow decomplexation process and the possible accumulation of highly toxic Cr(VI). Herein, a sulfidated zero-valent iron coupled ozonation strategy (S-ZVI/O 3 ) was proposed to achieve efficient decomplexation and simultaneous abatement of Cr(III)-EDTA without Cr(VI) accumulation. Results revealed that S-ZVI could catalyze O 3 to enhance removal of Cr(III)-EDTA and total organic carbon. Moreover, 88.3 % of total Cr was sequestrated by S-ZVI/O 3 and the corresponding kinetic constant was 3.1 times higher than that of ZVI/O 3 . Mechanistically, electron paramagnetic resonance and probing tests verified HO • was the dominant reactive oxidation species for decomplexation of Cr(III)-EDTA in both S-ZVI/O 3 and ZVI/O 3 . More attractively, it was found that structural Fe(II) was the major O 3 activator in S-ZVI/O 3 , whereas dissolved Fe 2+ accounted for O 3 catalyzation in ZVI/O 3 . The X-ray absorption spectroscopy analysis revealed that sulfidation treatment could enhance corrosion of ZVI with the formation of sufficient Fe(II) species. The in-situ formed Fe(II) could not only transform undesired Cr(VI) back to Cr(III) but also co-precipitate with Cr(III) to form solid Fe-Cr hydroxides. Besides Cr(III)-EDTA, S-ZVI/O 3 is also applicable to other EDTA complexed heavy metals. This work would provide a new method for the heavy metal complexes removal from water.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Minzi Liao,Shengxi Zhao,Kai Wei,Hongwei Sun,Lizhi Zhang
Cr(III)-organic complexes removal from wastewater is challenging to decompose the complexes without producing toxic Cr(VI). Herein we demonstrated that oxalated zero-valent iron (Ox-ZVI) could one-step decomplex 95.4% of Cr(III)-EDTA with 94.2% removal of total Cr and 60.5% removal of TOC without generating Cr(VI) at pH 6.0. Ox-ZVI with FeC 2 O 4 shell preferred to adsorb and activate O 2 to produce more reactive species than ZVI with iron oxide shell, while the generated 1 O 2 could selectively break the Cr-O and Cr-N bond to precisely decomplex Cr(III)-EDTA without producing Cr(VI). The released Cr(III) was in-situ precipitated on the surface of ZVI in Cr(OH) 3 form. Interestingly, •OH preferred the effective degradation of the released EDTA ligand to the oxidation of the chelated Cr(III) at pH 6.0. This study offers a green and facile method for the Cr(III)-organic complexes treatment, and also sheds light on the importance of reactive species adjustment for the precise pollutant control.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHEMISTRY LETTERS
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2020
·Vol. 49
·期 11
·1421-1425
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IF 1.361
Wang Shaohua,Zhang Hanying,Li Hao,Wu Ruijie,Hua Zhongqiu,Wu Yi,Tian Xuemin
WO3 nanosheets were synthesized by an acidification method and Cr was loaded on the surface of nanosheets via an impregnation procedure. The morphologies of pristine and Cr-loaded WO3 nanosheets were analyzed. Gas sensors based on pristine and Cr-loaded WO3 nanosheets were fabricated by a screen-printing technique and their sensing properties were also investigated. It was found that the catalytic modification of Cr can significantly improve the sensing performance of WO3 nanosheets to ammonia. In addition, the sensitization mechanism of Cr-loaded WO3 could be caused by the electrical sensitization effect and more stable product in the sensing processes to ammonia.
研究领域:
材料科学
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化学传感器
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DOI
高影响因子
ACS Applied Nano Materials
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2019
·
IF 0
Yi Feng,Qian Chen,Mengjue Cao,Nan Ling,Jianfeng Yao
Defect engineering and surface chemistry are closely related to the performance of materials. In this work, the effects of Zr precursors and Ti substitution on the photocatalytic performance of UiO-66-NH2 are studied and analyzed from the perspective of defect engineering and surface chemistry. The findings show that when using ZrOCl2·8H2O as the Zr precursor combined with the postsynthetic treatment of Ti substitution, sample U-OCl-Ti shows significant improvement in Cr(VI) adsorption (20.9 mg/g) and photocatalytic reduction of Cr(VI) under visible light. The improvement can be attributed to the highly defective framework and more -NH2 groups exposed on the surface; therefore the highest light absorption and lowest recombination rate of photogenerated electron–hole pairs are observed in U-OCl-Ti. The findings in this study contribute to a better understanding of how defects and surface chemistry affect the photocatalytic performance, thus providing some designing knowledge for the synthesis of UiO-66 or UiO-66-NH2 with high photocatalytic performance.
研究领域:
材料科学
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环境科学
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产品关联
DOI
INORGANIC CHEMISTRY
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2022
·
IF 5.436
Mianmian Wu,Nan Li,Shixiang Zuo,Wenjing Shen,Guifang Sun,Qingfei Li,Minghao Shi,Jiangquan Ma
Piezocatalysis is a promising technology to address environmental pollution by converting mechanical energy into chemical energy. Herein, MoSe2 nanosheets with different 1T phase percentages (ranging from 30 to 80%) were constructed by adjusting hydrothermal temperature. Moreover, the roles of phase engineering in the piezocatalysis were thoroughly investigated by degrading rhodamine B and reducing Cr(VI) in ultrasonic vibration conditions. In particular, MoSe2 prepared at 220 °C (MoSe2-220) exhibits ultrahigh observed constant kobs and degradation rate k, which is superior to most reported catalysts to date. The experimental results indicate that the introduction of the 1T phase increases the active sites of the material, improves the conductivity, and inhibits the recombination of electrons and holes. Moreover, an internal electric field in the 2H phase induced by piezoelectric polarization is facilitated to separate electron–hole pairs, enabling the degradation and reduction to proceed. The capture experiments and EPR tests further confirm that •O2– and •OH are main reactive species, and a rational mechanism is finally put forward. This study offers a clear understanding of phase engineering in piezocatalysis and provides an efficiency strategy to construct highly efficient piezocatalysts.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
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2016
·
IF 2.183
Pande Zhang,Benxue Jiang,Jintai Fan,Xiaojian Mao,Long Zhang
Cr and Nd co-doped laser ceramics, as the potential gain materials in inertial confinement fusion (ICF), have been widely investigated. And the study on valence states of chromium ions is important. The effects of sintering additives and annealing atmosphere on the valence state of chromium were studied in detail, and the results shown that the Cr valence states were demonstrated to be Cr 2+ and Cr 3+ ions in HIP-sintered Cr(0.2 at.%), Nd(0.8 at.%): LuAG laser ceramics. And the intensity of the near-infrared absorption band caused by Cr 2+ ions was attenuated with the decreasing SiO 2 concentration and increasing MgO amount. The near-infrared absorption could be eliminated by annealing in air. And the transformation of valence states of Cr ions in the Cr,Nd:LuAG ceramics were also confirmed by electron paramagnetic resonance and X-ray photoelectron spectroscopy.
研究领域:
材料科学
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光学工程
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物理学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
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2024
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IF 5.4
Jiajing Zhu,Hui Wang,Yuqi Zhai,Liangjun Huang,Jie Cui,Liuzhang Ouyang,Min Zhu,Jacques Huot
MgH2 is a promising solid-state hydrogen storage medium with a high hydrogen capacity and low cost, but it suffers from high hydrogen sorption temperatures. In this work, Cr-doped TiO2 solid solution nanocatalysts were synthesized and demonstrated to significantly reduce the hydrogen sorption temperatures and pressure of MgH2. The Ti(5Cr)O2 catalyzed MgH2 releases over 6.1 wt % of H2 at 200 °C, and even at 175 °C, 2.62 wt % H2 can be desorbed. The dehydrogenation activation energy is greatly reduced to 85.3 ± 8.7 kJ/mol, which is ∼49.7 kJ/mol less than that observed for pure MgH2. The dehydrogenated product can absorb 4.5 wt % of H2 within 10 s at a low temperature of −20 °C and back pressure of 30 bar, or the hydrogen uptake content can reach 4.81 wt % under 5 bar and 75 °C. The mechanism study indicates that the Cr-doped TiO2 can markedly reduce the adsorption energy and dissociation energy barrier of H2 molecules and greatly enhance the dissociation ability of H on the catalyst surface. This work demonstrates the potential of modified TiO2 as a cost-effective and efficient catalyst for Mg-based hydrogen storage materials.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）