ENVIRONMENT INTERNATIONAL
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2019
·
IF 7.943
Qian Sun,Cun Liu,Peixin Cui,Tingting Fan,Mengqiang Zhu,Marcelo Eduardo Alves,Matthew G. Siebecker,Donald L. Sparks,Tongliang Wu,Wei Li,Dongmei Zhou,Yujun Wang
Apart from surface complexation, precipitation of minerals also plays an important role in reducing the mobility and transport of heavy metals in the environment. In this study, Cd(II) sorption species on surfaces of γ-Al 2 O 3 at pH 7.5 were characterized using multiple techniques. Results show that in addition to adsorption complexes, Cd hydroxide phases (Cd(OH) 2 precipitates and Cd x (OH) y polynuclear complexes) were formed at the initial stages of Cd(II) sorption and gradually transformed to CdCO 3 with time. In addition, Cd(II) formed Cd Al layered double hydroxide (LDH) on γ-Al 2 O 3 under various conditions, independent of temperature and Cd loadings. The formation of Cd hydroxide phases and Cd Al LDH could be ascribed to surface-induced precipitation because the bulk solution was undersaturated with respect to hydroxides. Cd Al LDH formation on the Al-bearing mineral here is rather surprising because typically this occurs with elements of ionic radii similar to that of Al 3+ ; this formation is unknown for metals such as Cd(II) with a much larger ionic radius. The thermodynamic feasibility of Cd Al LDH formation was further confirmed by laboratory synthesis of Cd Al LDH and density function theory (DFT) calculations. These results suggest that Cd precipitation on Al-bearing minerals can be an important mechanism for Cd immobilization in the natural environment. Additionally, the finding of Cd Al LDH formation on Al-bearing minerals and the thermodynamic stability of Cd Al LDH provides new insights into the remediation of Cd-polluted soils and aquatic systems.
研究领域:
环境科学
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地球化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
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2019
·
IF 2.961
Yue Zhao,Tong Song,Katarzyna Matras-Postolek,Ping Yang
Highly luminescent CdTe quantum dots (QDs) is a typical luminescent material with great application potential. The photoluminescence (PL) and stability of the QDs depended strongly on Cd precursors, ligand (e.g. thioglycolic acid TGA) and preparation conditions. In this paper, CdTe QDs were prepared using Cd precursors with various molar ratios of TGA/Cd at different conditions. The composition of Cd-precursors depend strongly on the molar ratios of TGA/Cd and storage time due to the formation of Cd-TGA clusters which affects strongly the surface states of the QDs. The effect of the preparation conditions of Cd-precursors (e.g. molar ratios of TGA/Cd) on the PL peak wavelength, the full width at half maximum of PL spectra, PL quantum yields (PLQYs), fluorescence lifetime , and stability were tested in detailed. Interestingly, the PLQYs of the QDs prepared using a large molar ratio of TGA/Cd remarkably increased after Cd precursor stored in dark conditions for long time. This confirms that Cd-TGA clusters in the precursors drastically affected the synthesis of the QDs. The mechanism was discussed in detailed. These aqueous CdTe QDs with high PLQYs were obtained using a molar ratio of TGA/Cd of 1.25. In addition, the PL peak position of the QDs was red-shifted with increasing temperature, but is back to the initial value after cooling down to room temperature . Cycle test indicates red-emitting QDs reveal high stability.
研究领域:
材料科学
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光学
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纳米技术
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 41
·6186-6195
·
IF 3.382
Qian-Qian Liu,Ke-Fen Yue,Xian-Jun Weng,Yao-Yu Wang
A novel two-dimensional Cd-based metal–organic framework, {[Cd(Hcpnc)(DMF)]·DMF·2H2O}n (Cd-MOF) has been synthesized successfully under solvothermal conditions by utilizing a multifunctional N,O-building block ligand, 2-(2,5-dicarboxylphenyl)nicotinic acid (H3cpnc), which is a new and virtually unexplored multifunctional pyridine-tricarboxylic building block. The product was isolated as a stable crystalline solid and was fully characterized by IR spectroscopy, elemental analyses, thermogravimetry and differential scanning calorimetry, powder X-ray diffraction, single-crystal X-ray diffraction analyses, and X-ray photoelectron spectroscopy. The solid-state luminescence properties of the Cd-MOF were studied at ambient temperature. The compound shows high selectivity and sensitivity for Cu2+ ions and nitrobenzene by the luminescence quenching behavior with excellent repeatability. Additionally, the Cd-MOF exhibits an excellent specific capacitance of 321 F g−1 at 0.5 A g−1 and it still retains 95.2% of the original capacitance after 1000 cycles. Therefore, the Cd-MOF as a kind of bifunctional material will have broad application prospects in luminescence detection and supercapacitors.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
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2016
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IF 1.272
Jiang Haiyan,Zhao Qiuxiang,Zeng Ying
In this study, modified polyvinyl alcohol (PVA) was prepared and characterized by element analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and surface area and proximity analysis. The isotherms and thermodynamic parameters of the modified PVA adsorption process were estimated. The data indicate that the adsorption process is exothermic, feasible, spontaneous, and fit to the Langmuir isotherm model. The maximum adsorption capacities for Cd(II) and Pb(II) were calculated to be 1.19 and 1.48 mmol/g, respectively. Sorption was rapid, with the removal percentage higher than 98% after 10 min. Adsorption behavior mechanisms were analyzed using pseudo-first-order and pseudo-second-order models, which were highly fitted to pseudo-second-order model. This suggests the main adsorption mechanism is a chemical adsorption, involving ion exchange and valence forces through sharing or exchange of electrons between metal ions and modified PVA. The modified PVA is a good reusable sorbent, enhancing the economics of practical application for the removal of Cd(II) and Pb(II) from water and wastewater.
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 MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12801-12810
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IF 3.553
Cao Sheng,Dai Chencheng,Yao Shangfei,Zou Bingsuo,Zhao Jialong
In recent years, light-emitting Mn 2+ -doped nanocrystals (NCs) have been widely studied because of their strong and stable Mn 2+ d–d emission. Herein, highly efficient colloidal Mn 2+ -doped Cd–In–S NCs were prepared by a hot injection strategy. The as-prepared NCs have a cubic crystal structure of CdS host and exhibit strong Mn 2+ emission. The photoluminescence (PL) intensity, PL position, and PL lifetime of this Mn 2+ emission can be adjusted by changing the doping level of Mn 2+ . In particular, by tuning the amount of dopant, the emission color can be varied in the range of 601 nm to 643 nm, which is due to the coordination field environment of Mn 2+ ions changed by the doping concentration. The PL intensity of Mn 2+ is significantly enhanced by the ZnS shell coating, and the highest PL quantum yield can reach 56%, which is attributed to the removal of NCs surface-related defects by shell modification. A prototype LED was fabricated as well by using the as-prepared highly efficient Mn 2+ -doped Cd–In–S NCs as a color conversion material. The Mn 2+ -doped multicomponent semiconductor NCs reported here extend the availability of classical Mn 2+ -doped luminescent materials and provide alternatives for other applications requiring orange-red colloidal NCs.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2022
·
IF 5.723
Feilin Zhao,Chizhong Wang,Dongdong Wang,Yimeng Yin,Jie Yu,Jinchi Han,Jie Zeng,Huazhen Chang
A series of Cd-doped NiO catalysts were prepared and tested in the N 2 O catalytic decomposition reaction. In comparison with NiO, it was found that the Cd 0.04 Ni catalyst showed higher N 2 O decomposition activity in the temperature range of 300–450 °C with or without O 2 , and lower activation energy (77.8 kJ mol −1 ). The incorporation of Cd into the NiO lattice was verified by X-ray diffraction (XRD) patterns and Raman spectra. This led to the distortion of the original NiO structure and weakened the Ni-O bond. X-ray photoelectron spectroscopy (XPS) results showed that compared with NiO and CdO, Cd 0.04 Ni possessed higher Ni 2+ and Cd (n+1)+ contents, which might have been induced by the electron transfer behavior between CdO and NiO. A possible mechanism for active site regeneration and O 2 desorption over Cd 0.04 Ni was proposed. The Cd 0.04 Ni catalyst also exhibited good resistance to NO and O 2 .
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Yanfang Tao,Yanyan Li,Meng He,Xiandong Zhao,Xiaojie Yang,Jinmao Li,Li Zhao,Yang Li,Shimin Wang
Sb 2 S 3 thin-film materials are regarded as promising candidates for next-generation thin-film solar cells due to their superior stability, simple chemical composition, cost-effectiveness, and excellent charge transport properties. In numerous studies, Sb 2 S 3 solar cells prepared with cadmium sulfide as the electron transport layer demonstrated high photovoltaic conversion efficiencies, mainly due to the key role of the CdS layer in optimizing the crystalline quality of Sb 2 S 3 thin films, regulating the crystal growth orientation, and enhancing the charge transport properties. Therefore, cadmium sulfide play a crucial role in determining the crystallinity, growth orientation, and charge transport performance of antimony sulfide films. Currently, the commonly used cadmium sources regarding the CdS preparation process are Cd(NO 3 ) 2 , CdSO 4 , CdCl 2 , and Cd(Ac) 2 . This study systematically investigates the effects of different Cd sources on the crystallization, morphology and charge transport properties of Sb 2 S 3 thin films. The results demonstrate that CdS prepared from Cd(NO 3 ) 2 significantly enhanced the crystallinity, grain morphology, band gap energy level, and photovoltaic performance of Sb 2 S 3 thin films, reaching a photovoltaic conversion efficiency of 4.23 %, which provides a solid foundation for further optimization and improvement of Sb 2 S 3 solar cells.
研究领域:
薄膜太阳能电池
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材料科学
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光伏技术
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半导体材料
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Tao Chen,Hongwei Ming,Baoli Zhang,Chen Zhu,Jian Zhang,Qi Zhou,Di Li,Hongxing Xin,Xiaoying Qin
Thermoelectric properties of CuSb1–xCdxSe2 (x = 0–0.08) compounds, prepared by vacuum melting, were studied at temperatures of 300–675 K. The results indicate that Cd doping causes both remarkable increase in the Seebeck coefficient and drastic drop of lattice thermal conductivity. The enhancement of thermopower originates mainly from increase of electronic density of states, while the drop of lattice thermal conductivity can be ascribed to enhanced phonon scattering by introduced impurity (dopant) atoms. As a consequence, thermoelectric figure of merit ZT is improved with a maximum ZT = 0.55 (at 675 K) being reached for CuSb0.98Cd0.02Se2, which is around 2.2-fold higher than that of the CuSbSe2 pristine compound. Our results indicate that Cd substitution is a feasible way to improve thermoelectric performance of the CuSbSe2-based system.
研究领域:
材料科学
·
热电学
✓ 已验证
DOI
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2025
·
IF 2.5
Ziqi Wang,Yahui Ji,Nana You,Xiaoping Hu,Fangxin Du,Gen Liu
Epinephrine (EP), a vital hormone and neurotransmitter, is central to the body's fight-or-flight mechanism, boosting physical strength, mental focus, and reaction speed in high-stress scenarios. Measuring EP levels is key for analyzing stress reactions, identifying health disorders, and maintaining balanced physiological performance. In this work, we successfully synthesized cadmium-doped hollow mesoporous g-C 3 N 4 spheres (Cd@HMCNs) with a high surface area and high porosity. An electrochemiluminescent (ECL) sensor for EP detection was developed since EP can effectively suppresses the ECL emission of the Cd@HMCNs/K 2 S 2 O 8 system. The sensor successfully detected EP within the concentration range of 5.0 × 10 -10 mol·L -1 to 1.0 × 10 -5 mol·L -1 , with a detection limit as low as 1.67 × 10 -10 mol·L -1 . When applied to pharmaceutical sample testing, the proposed biosensor yielded reliable and satisfactory results.
研究领域:
分析化学
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生物医学工程
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纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Yanan Ding,Feng Wei,Changchang Dong,Jiadong Li,Chang Zhang,Xiaojun Han
Heavy metal ion pollution has been a potential threat to human health. Herein, a sensitive electrochemical sensor for simultaneously detection of Cd(II) and Pb(II) was developed using a metal–organic framework material UiO-66. UiO-66 before and after carbonization was used to modify the GCE electrodes, respectively. The carbonized UiO-66 modified GCE electrode (CUiO-66/Bi/GCE) showed good detection ability with the linear detection range of 10–50 μg/L and detection limit of 1.16 and 1.14 μg/L for Cd(II) and Pb(II), respectively. Compared with UiO-66, carbonized UiO-66 provided more active sites for Bi ions and heavy metal ions to co-deposit and facilitated the electron transfer, leading to better detection performance. The decoration strategy was applied to disposable screen-printed carbon electrodes (SPCEs) to obtain the linear detection range of 20–120 μg/L and detection limit of 4.67 and 1.24 μg/L for Cd(II) and Pb(II) respectively. The prepared electrochemical sensors hold great potential in real water sample detections.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 56
·29715-29723
·
IF 3.708
Shoulian Wei,Yong Liu,Mingdong Shao,Ling Liu,Hongwu Wang,Yanqing Liu
A novel magnetic ion-imprinted polymer (MIIP) was prepared by inverse microemulsion polymerization using ethylene glycol dimethacrylate (EGDMA) as the cross-linker, and 2,2-azo-bis-isobutyronitrile (AIBN) as the initiator. Fe3O4 particles were incorporated into the imprinted polymer matrix containing 4-vinyl pyridine and acrylate-modified Spirulina platensis as the functional monomers, Pb(II) and Cd(II) as double-templates. The MIIP product was characterized by Fourier-transform infrared spectroscopy, thermal gravimetric analysis and scanning electron microscopy and then evaluated for the magnetic solid-phase extraction of Pb(II) and Cd(II) from environmental and food samples. Inductively coupled plasma-optical emission spectrometry detection was also performed. The obtained MIIP showed the magnetic property, agglomerates of globular particles and rough surface morphologies. The maximum static adsorption capacities of MIIP for Pb(II) and Cd(II) were 108 and 56 mg g−1, respectively. The factors affecting the adsorption and separation of Pb(II) and Cd(II), namely, solution pH, adsorbent dosage, eluting solvent, and elution time, were investigated. Under the optimized conditions, the detection limits (S/N = 3) of the method were 0.1 and 0.08 μg kg−1 for Pb(II) and Cd(II), respectively. The relative standard deviations (RSDs) for 10-replicate detections of a soil sample were 3.3% and 3.7% for Pb(II) and Cd(II), respectively. Standard solutions containing Pb(II) and Cd(II) in the concentration range of 0.8 to 5000 μg kg−1 were analyzed by the proposed procedure and it was found that the calibration curve was linear in this range (R2 ≥ 0.999). The proposed method was successfully used to determine the Pb(II) and Cd(II) contents of cinnamon, lotus root and sweet potato with recovery rates ranging from 87.5% to 106%.
研究领域:
材料科学
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Lixin Kang,Qiufang Liang,Qayum Abdul,Arif Rashid,Xiaofeng Ren,Haile Ma
To prevent food spoilage caused by microbial infection, the development of an environmentally friendly antimicrobial preservation material is crucial. Here, the microporous γ-CD-MOFs was utilized to encapsulate the hydrophobic active substance curcumin, resulting in the preparation of a non-toxic antimicrobial material (Cur-CD-MOFs). The results revealed that curcumin encapsulation in Cur-CD-MOFs occurred primarily in the carbonyl group, benzene ring, and enolic side ring of curcumin. The Cur-CD-MOFs had a 100% bactericidal effect on Escherichia coli and Staphylococcus aureus at 4 h and 8 h, and a strong inhibitory effect on aerial mycelium of Penicillium expansum and Botrytis cinerea . Furthermore, the incorporation of Cur-CD-MOFs improved the Pul/Tre film barrier and mechanical properties. The effectiveness of Cur-CD-MOFs-Pul/Tre in retaining fruit freshness was validated using Centennial Seedless grapes. This study confirmed that Cur-CD-MOFs is a promising antibacterial material, and Cur-CD-MOFs-Pul/Tre will be a potent candidate for food preservation.
研究领域:
食品科学
·
生物技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）