Nanoscale
·
2025
·
IF 5.1
Yifen Wang,Wei Zhao,Bin Wang,Zhendong Song,Huan Yang,Fang Wang,Xiaohong Xu,Yang Liu
Chromium selenide (Cr–Se)-based low-dimensional materials have attracted significant attention in spintronics because of their diverse structure- and composition-dependent magnetic properties. While significant progress has been made in fabricating the Cr–Se family of nanomaterials through techniques like chemical vapor deposition, the synthesis of Cr–Se nanocrystals (NCs) via colloidal methods remains underexplored. In this work, we demonstrate the robust colloidal synthesis approach for producing Cr2Se3 and Cr3Se4 NCs with distinct morphologies by varying the Cr precursors and ligands. Cr–Se NCs can serve as templates for cation exchange (CE) reactions involving monovalent Cu+ and Ag+, divalent Zn2+ and Cd2+, and trivalent In3+, facilitating the creation of a diverse library of metal selenide NCs and nanoheterostructures. Our findings highlight how the outcomes of CE reactions are influenced by the structure of various Cr–Se phases. Furthermore, the magnetic properties of the as-synthesized Cr–Se NCs and their derivative CuCrSe2 were investigated. Our work provides a robust synthesis route for the Cr–Se class of magnetic nanomaterials and a platform for creating a diverse range of functional metal selenide NCs via CE reactions.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Junsuo Li,Xinying Li,Shoucheng Ma,Wei Zhao,Wenming Xie,Jianqing Ma,Yijun Yao,Wei Wei
Microplastics (MPs) can act as vectors for various contaminants in the aquatic environment. Although some research has investigated the adsorption characteristics and influencing factors of metals/organic molecules on MPs, the effects of dissolved organic matter (DOM) (which are ubiquitous active species in ecosystems) on metal oxyanions such as Cr(VI) capture by MPs are largely unknown. This study explored the adsorption behaviors and mechanisms of Cr(VI) oxyanions onto polystyrene (PS) MPs using batch adsorption experiments and multiple spectroscopic methods. The effects of representative DOM components (i.e., humic acid (HA), fulvic acid (FA) and tannic acid (TA)) on Cr(VI) capture by PS were particularly studied. Results revealed a significantly enhanced adsorption of Cr(VI) on PS in the presence of TA. The Cr(VI) adsorption capacity was increased from 2876 μg g −1 to 4259 μg g −1 and 5135 μg g −1 when the TA concentrations raised from 0 to 10 and 20 mg L −1 , respectively. Combined microscopic and spectroscopic investigations revealed that Cr(VI) was reduced to Cr(III) by TA and formed stable Cr(OH) 3 colloids on PS surfaces. Contrarily, HA and FA inhibited Cr(VI) adsorption onto PS, especially at pH > 2.0 and higher DOM concentrations, due to site competition and electrostatic repulsion. Increase in pH was found to reduce zeta potentials of MPs, resulting in inhibited Cr(VI) adsorption. The adsorbed Cr(VI) declined with increasing ionic strength, implying that outer-sphere surface complexation affected the adsorption process in the presence of DOM. These new findings improved our fundamental understanding of the fate of Cr(VI) and MPs in DOM-rich environmental matrices.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhimin Lv,Shuya Liu,Yuxin Liu,Peisheng Liu,Ming Fang,Xiaoli Tan,Wei Xu,Mingguang Kong,Xiangke Wang
The pollution of poisonous Cr(VI) poses a severe threat to our health, and the reduction of Cr(VI) to Cr(III) has become a high-efficiency way for wastewater remediation. Herein, the catalyst with metallic Ni confined in an N-doped mesoporous carbon sphere was prepared by the easy pyrolysis method of carbon sphere with Ni salts and showed remarkable activity, selectivity, and stability for reducing Cr(VI) with HCOOH. Notably, the Ni-N-C600 can rapid and 100 % reduction of the high concentrations of Cr(VI) (100 mg/L, 100 ml) using HCOOH within 7 min at room temperature over the reported Ni-based catalysts. Even in the presence of coexisting ions (0.1 M of Na + , K + , Ca 2+ , Zn 2+ , NO 3 − , Cl − , CO 3 2− , and SO 4 2− ), its catalytic efficiency is not affected at all. The catalytic activity of the Ni-N-C600 declined little even after five cycles because the confinement effect of the mesoporous carbon sphere physical barrier prevented the leaching and aggregation of Ni NPs. The magnetism of metallic Ni greatly facilitates the separation of the catalyst. The reduction mechanism is mainly achieved by active hydrogen produced through the dehydrogenation of HCOOH. In addition, the electronic donation of C-containing functional groups also caused a partial reduction of Cr(VI). This work provides a rational design and development of high-efficiency non-noble metal catalysts to reduce Cr(VI).
研究领域:
环境科学
·
材料科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Fei Chen,Qi Yang,Fubing Yao,Yinghao Ma,Yali Wang,Xiaoming Li,Dongbo Wang,Longlu Wang,Hanqing Yu
Visible-light-driven photocatalysis has been widely employed as an efficient and environment-friendly technology for organic pollutants removal from wastewaters. Herein, a novel approach of BiVO 4 -catalyzed sulfite under visible light irradiation (BiVO 4 /sulfite/vis) was established to achieve the model contaminant methyl orange (MO) removal. About 92.06% of MO could be rapidly degraded within 50 min in this new catalytic system and the reaction rate was close to 105.29-fold as high as that of BiVO 4 /vis system. The effects of sulfite amount, catalysis dosage, MO concentration, inorganic anions and natural organic matters (NOMs) were deeply investigated and the correspondent mechanisms were also discussed. Interestingly, the coexisting Cr(VI) at certain concentration would accelerate MO removal and further demonstrated by phenol and atrazine degradation through the Cr(VI) + organic pollutants combined pollution system. The presence of HA in BiVO 4 /sulfite/vis also exhibited positive effects on the degradation of organic pollutants, attributable to more OH species generation. Three-dimensional excitation-emission matrix fluorescence spectra (3D EEMs) and liquid chromatography-mass spectrometer (LC-MS) were implemented to explore MO degradation pathway. The sulfite (SO 3 − ) generation was confirmed by active species trapping experiments and electron spin resonance (ESR), and N 2 purging reaction was also carried out to exclude the oxidative species of SO 3 − . The photoinduced holes played a direct role in the SO 3 − generation and the OH radical also contributed. This study provides new thoughts to improve the photodegradation of multiple organic pollutants by the introducing of sulfite or sulfite/Cr(VI).
研究领域:
环境科学
·
光催化技术
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高影响因子
Biosensors-Basel
·
2025
·Vol. 15
·期 10
·703
·
IF 5.6
Harriet Sonia Nalumansi,Fuwei Pi,Jingkun Li,Guoyong Jiang
The detection of volatile organic compounds (VOCs) is critical for ensuring food safety, particularly for identifying spoilage gases and food adulterants. Surface Enhanced Raman Spectroscopy (SERS) has traditionally relied on noble metals such as gold and silver for strong electromagnetic enhancement. However, these substrates present challenges in terms of cost, stability, and integration into real-world applications. In this study, we explore a hybrid metal–organic framework (MOF) with reduced graphene oxide (rGO) as a SERS active substrate. The developed material showed a good sensitivity for VOC formaldehyde (FA), easily detectable at peak 1452 cm−1and offering an RSD of 16.95%. Since the substrate did not rely on any noble metals for SERS enhancement, this low cost and easy material could be fine-tuned, creating alternative less-toxic materials for detection in industries such as food safety.
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 8
·6103-6107
·
IF 1.556
Zhang Jing,Zhang Guilong,Zheng Kang,Cai Dongqing,Wu Zhengyan
Urea was used to disperse nanoscale zero-valent iron (NZVI) for reduction of Cr(VI) to Cr(III) in aqueous solution. Scanning electron microscope and fourier transform-infrared spectra investigations demonstrated that urea could effectively increase the dispersion of NZVI resulting in
more effective reduction sites (ERS) for Cr(VI) ions. Batch reduction experiments indicated that the reductive capacity of urea dispersed NZVI (UNZVI) was significantly improved, as the reductive efficiency reached 96.8% under optimal condition compared with the raw NZVI (72.14%). Additionally,
the NZVI was stable for at least 28 days after urea treatment. The dispersion mechanism was proposed that the steric hindrance effect of the urea coating on the surface might play a key role in dispersing the NZVI particles.
研究领域:
环境科学
·
材料科学
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Honghong Lei,Yuncheng Zhou,Peng Jiang,Wei Wang,Wenbin Cao,Yawen Xue
Cr-doped Ba 2 In 2- x Cr x O 5+ y (0 ≤ x ≤ 0.5) orange-brown inorganic oxides have been successfully synthesized by solid-state reaction. X-ray diffraction (XRD) patterns show that their crystal structures transform from orthorhombic to cubic by increasing the Cr doping amount. Field emission scanning electron microscopy (FESEM) measurements show powder particles of irregular shape with average particle size of about 10 µm. The colors of the compounds are tuned from light yellow ( x = 0) to orange ( x = 0.1) and then to dark brown ( x = 0.5). X-ray photoelectron spectroscopy and UV–Vis absorption spectroscopy demonstrate the oxidation state of Cr to be + 6 and the change in color to be due to the metal-ligand charge transfer of Cr 6+ -O 2- .
研究领域:
材料科学
·
光学
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高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 45
·5819-5825
·
IF 2.378
Shunzhen He,Xi Lin,Hao Liang,Fubing Xiao,Feifei Li,Can Liu,Pengfei Fan,Shengyuan Yang,Yong Liu
As a priority pollutant in the environment, hexavalent chromium (Cr(VI)) has received increasing attention. In this work, a safe, simple, low-cost, effective and sensitive colorimetric strategy for the determination of Cr(VI) was introduced based on polyvinylpyrrolidone (PVP) functionalized silver nanoparticles (PVP–AgNPs). The prepared PVP–AgNPs had good dispersibility, and exhibited a state change from dispersed to aggregated when Cr(VI) was present in pH 5.5 PBS buffer due to the special and strong coordination between PVP and Cr(VI), accompanied by a color change from bright yellow to orange. Under the optimized conditions, the concentration of Cr(VI) in the range of 1.0 × 10−7 M to 2.4 × 10−6 M showed a good linear relationship with the ratio of the absorbance at 530 nm to that at 390 nm (A530 nm/A390 nm), and the limit of detection (LOD) was 34 nM. The method also showed good precision and high repeatability in determining Cr(VI) in real water samples such as pond water, tap water and river water. The recoveries ranged from 93.5% to 104.3%, indicating the method can be used for an extensive range of practical applications.
研究领域:
环境科学
·
分析化学
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 8
·4757-4769
·
IF 3.809
Li Yunhua,Zhu Hongxiang,Zhang Cunzhi,Cheng Meixiao,He Hui
A novel PEI-grafted magnetic cellulose (Fe 3 O 4 /MCC-PEI) with high amino density was prepared by grafting PEI onto the surface of magnetic cellulose in NaOH/urea aqueous solvent. The embedding of Fe 3 O 4 into cellulose provided excellent magnetic responsiveness for recycling the adsorbent in the magnetic field. The adsorbent for Cr(VI) removal from aqueous solution overcame the disadvantages of adsorbent like difficult recycling, poor regeneration performance and low removal rate at low Cr(VI) concentration. Therefore, the as-prepared Fe 3 O 4 /MCC-PEI showed high Cr(VI) adsorption capacity (198.8 mg/g) which could achieve adsorption equilibrium within 10 min, and the removal rate could reach 100% at low Cr(VI) concentration (less than 1.0 mg/L), demonstrating that the high amino density (7.85 mmol/g) and magnetic responsiveness of the adsorbent can greatly promote adsorption capacity and removal efficiency. The adsorbent also showed promising regeneration performance, and the adsorption capacity remained above 96% after six cycles. Graphical
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Qing Cen,Qiaoyuan Gao,Chenlu Zhang,Yingqi Liu,Qi Wang,Qi Wang
In this study, visible-light-active iron tungstosilicate (FeSiW) was fabricated via solvothermal method . Fe 3+ was applied as counter ion to precipitate with silicotungstic acid (H 4 SiW 12 O 40 ) in methanol solution. It can be observed from FT-IR spectra that the Keggin structure of SiW 12 O 40 4− was well maintained in FeSiW. Besides, the effect of different initial molar ratios of Fe 3+ to H 4 SiW 12 O 40 was investigated (from 4:1 to 4:4). By photoelectrochemical characterizations, such as photocurrent response and Mott-Schottky (M-S) plots, easiest generation of electron-hole pairs and lowest charge transfer resistance can be observed on FeSiW with initial molar ratio of 4:3. Moreover, FeSiW with 4:3 ratio also displayed highest activity for photocatalytic reduction of Cr(VI), despite of the largest band gap (ca. 2.71 eV). The lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) of the optimized FeSiW were estimated to be +0.03 V and 2.74 V vs NHE, respectively, which were thermodynamically feasible for Cr(VI) reduction and H 2 O oxidation . Even under acidic condition (pH 3), the optimized photocatalyst displayed good stability in cyclic runs. Therefore, the present study opens a new way for heterogeneous polyoxometalates as efficient photocatalyst for environmental application.
研究领域:
环境化学
·
材料科学
·
光催化
·
无机化学
·
污染治理
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Wei Zhang,Shilu Zhang,Jing Wang,Meng Wang,Qiulai He,Jianyang Song,Hongyu Wang,Jinping Zhou
In this study, we prepared a novel hybrid functionalized chitosan-Al 2 O 3 @SiO 2 composite (FCAS) for removing hexavalent chromium [Cr(VI)] from aqueous system. Spectroscopic studies like Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and energy dispersive spectroscope (EDS) were characterized. The effects such as dosage of adsorbent, pH, contact time and initial Cr(VI) concentration were evaluated. It has been illustrated that a wide acidic condition in the pH range of 2–6 was conducive to Cr(VI) adsorption and only 10 min was required to reach about 80% adsorption. Also, the adsorption properties of prepared adsorbent such as kinetics, thermodynamics and isotherms were comprehensively studied. Additionally, the adsorption capacity barely declined even after five cycles. Studies found that FCAS with characteristics of high performance of adsorption rate and capacity and better reusability would be a potential adsorbent for wastewater treatment .
研究领域:
环境科学
·
材料科学
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Polymers
·
2025
·Vol. 17
·期 12
·1658
·
IF 4.9
Chenkun Yu,Ze Liang,Ruoyao Zhou,Tingting Gao,Zhaojiang Wang,Xiaoxia Cai,Qian Lu,Cong Li,Jinshui Yao,Qinze Liu
Chromium (III) ions are essential for biological functions, whereas chromium (VI) ions (Cr (VI)) pose toxicity risks to both humans and animals. Therefore, it is crucial to remove these ions from industrial sources. In this work, to remove hazardous Cr (VI) from wastewater or convert it to Cr (III), catechol-modified alkali lignin (CAL) was prepared using catechol, acetone, and alkali lignin, which is a byproduct in the paper-pulping process. The sample was characterized using a combination of techniques, including scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Various factors influencing the adsorption behavior of CAL were investigated. The adsorption behavior aligns with the pseudo-second-order kinetic model and adheres to the Langmuir isotherm model. CAL simultaneously achieves Cr (VI) adsorption (498.4 mg/g) and reduction (54.6% to Cr (III)), surpassing single-function lignin adsorbents by integrating catechol’s redox capacity with lignin’s structural stability, which is another way to efficiently utilize Cr (VI) solutions. The mechanism of adsorption and reduction is discussed, which is influenced by its functional groups. In brief, this method paves a new path for the utilization of alkali lignin and provides novel opportunities for the removal of Cr (VI) contamination.
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高影响因子
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