SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Tiantian Nie,Pulin Hao,Zhendong Zhao,Wenjun Zhou,Lizhong Zhu
The bamboo biochars pyrolyzed at 400 °C and 600 °C (BC400 and BC600) were modified by hydrogen peroxide (H 2 O 2 ) to obtain the oxidized biochars. Biochar stability and the effect of oxidation treatment on the adsorption and co-adsorption of tetracycline (TC) and Cu 2+ onto biochars were investigated. The calculated carbon loss of biochars after oxidation treatment indicated that BC600 presented higher carbon stability than BC400 due to the condensed aromatic structure of biochar. Moreover, oxidation treatment introduced O-containing functional groups on biochar surface, but destructed the aromatic structures of oxidized biochars, which in turn affected the adsorption capacity of biochars for TC and Cu 2+ . Oxidation treatment obviously enhanced the adsorption of TC and Cu 2+ onto BC400 owing to the increase of O-containing functional groups, but significantly decreased TC and Cu 2+ adsorption onto BC600 because of the decreased π - π dispersive forces between biochar and adsorbate. The promotion effect of Cu 2+ on TC adsorption onto BC400 changed into inhibition effect after chemical oxidation owing to the pore blockage. However, the promotion degree of Cu 2+ for TC adsorption onto BC600 was enhanced through oxidation treatment due to electrostatic attraction and complexation. Meanwhile, oxidation treatment reduced the inhibition degrees of TC for Cu 2+ adsorption onto biochars, which was attributed to the increased amount of electron-rich groups. The results are helpful for the application of biochars in the soils remediation .
研究领域:
环境科学
·
土壤修复
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DOI
高影响因子
Journal of Nanophotonics
·
2024
·
IF 1.1
YingTe Wang,SiRong Cheng,RongRong Wu,YuanYuan Zhang,BoHan Wang
Nitrogen and sulfur co-doped green fluorescent carbon dots (G-CDs) with quantum yield (QY) of 28.26% were synthesized by hydrothermal method with p-phenylenediamine and thiosemicarbazone as precursors. The synthesized G-CDs exhibit good sensitivity and anti-interference ability for detecting copper ion (Cu2+) by fluorescence quenching (λex=390 nm, λem=535 nm) with a linear range of 20 to 200 μM and the limit of detection of 4.8 μM. This analytical method has been applied to detect Cu2+ of the local lake with good accuracy and recovery.
研究领域:
分析化学
·
材料科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Licai Hao,Yang Shen,Xuanhu Chen,Xiaodong Yang,Qianqian Du,Yue Bian,Liang Chen,Kun Tang,Rong Zhang,Youdou Zheng,Shulin Gu
We report the interaction between different sizes of CdTe quantum dots (CdTe QDs) and copper (II) ion (Cu 2+ ) via experimental and theoretical aspects. Different sizes of CdTe QDs are synthesized and size effects on the selectivity in the detection of Cu 2+ ions are studied. Experimental results indicate that with the size of CdTe QDs from 1.8 nm to 2.7 nm and to 3.2 nm increases, the linear range gets wider. For the smallest size of QD (QD 524 , 1.8 nm), the linear range is 1.0–5.0 × 10 −5 M with a limited detection of 2.8 × 10 −5 M. The Stern–Volmer plots at different temperatures demonstrate that the fluorescence of CdTe QDs is quenched by Cu 2+ ion through a dynamic quenching mechanism, and the physiological mechanism is analyzed. Electrons are transferred from CdTe QDs to Cu 2+ ion, and Cu 2+ ion acquire electrons and are reduced to Cu + ion, leading to fluorescence quenching . Meanwhile, with the increase in the number of transferred electrons, the phenomenon of fluorescence quenching is more obvious. In order to validate the process of electron transfer , the amount of transferred charge between Cu 2+ and CdTe QDs are calculated by using first principles density functional theory (DFT). Calculation results show that the smaller the QDs are, the more electrons they transfer. The linear range of the smaller size QDs (QD 524 ) is the narrowest, indicating fluorescence quenching is indeed the most obvious of all three sizes.
研究领域:
纳米材料
·
分析化学
·
量子点
·
环境传感
·
理论化学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 22
·4880-4888
·
IF 5.066
Dongxu Zhu,Aiwei Tang,Lan Peng,Zhenyang Liu,Chunhe Yang,Feng Teng
A simple low-cost and phosphine-free colloidal method was developed to prepare disk-shaped Cu2−xS nanocrystals (NCs) with different crystal structures and basal planes, which could be manipulated effectively by varying the Cu : S feed molar ratios and the amount of surfactants. The near-infrared (NIR) localized surface plasmon resonance (LSPR) wavelength could be tuned from 1133 to 1512 nm with the crystal phase changing from CuS (covellite) to monoclinic Cu7S4 (roxbyite) and Cu31S16 (djurleite). Phase transformation had more important effects on tuning the plasmonic resonance than the surface interaction of the deprotonated carboxyl functional group of oleic acid. Moreover, the crystal phase could transform from covellite to djurleite and the morphology underwent a transition from nanodisks to nanospheres when the post-treatment temperature of CuS nanodisks by dodecanethiol (DDT) was increased to 120 °C, but only a size decrease took place at room temperature. As a result, a slight red-shift of the LSPR wavelength was observed at room temperature, but an obvious red-shift from 1140 to 1910 nm with the change in crystal structure and morphology. The post-treatment temperature played an important role in tuning the plasmonic resonance of the products, which was closely associated with the variation of the crystal structure, morphology and surface properties.
研究领域:
纳米材料
·
等离激元学
·
胶体化学
·
材料科学
·
光学性质
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Lu-Qing Xie,Sui Peng,Ya-Nan Xin,Bo Liu,Xin-Yu Jiang,Jin-Gang Yu
A novel 3-dimensional graphene oxide/2-mercaptothiazoline (3D GO-MT) aerogel was prepared by using GO and MT which contains heteroatoms (nitrogen-, sulfur-) through a facile hydrothermal assembly process and a following freeze-drying technology . The effects of hydrothermal reaction temperature and GO-to-MT mass ratio on the physicochemical properties of the composites were investigated. The removal of Cu 2+ from aqueous solution by 3D GO-MT aerogels was evaluated. The results showed that the composite (GO-MT 1:3/100 °C ) with GO-to-MT mass ratio of 1:3 prepared at 100 °C had the highest adsorption capacity for Cu 2+ (0.5299 mmol g −1 ). In a bicomponent system of Cu 2+ /Pb 2+ , GO-MT 1:3/100 °C exhibited higher adsorption selectivity for Cu 2+ . And the distribution coefficients K of GO-MT 1:3/100 ° C for Cu 2+ /Y 3+ , Cu 2+ /Nd 3+ in the bicomponent systems were 0.6224 and 0.1253, respectively. The morphology and composition of GO-MT 1:3/100 °C , as well as the adsorption mechanism for Cu 2+ were investigated by scanning electron microscopy, Brunauer-Emmett-Teller, elemental analysis, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The presence of nitrogen and sulfur on MT heterocycle promoted the possible assembly of MT with GO through π-π stacking and hydrogen bonding interactions. Additionally, the existence of these heteroatoms in MT dominated the metal-chelate affinity of 3D GO-MT aerogel for selective adsorption of Cu 2+ . The fitted data of kinetics and thermodynamics showed that the adsorption process followed linear pseudo-second-order kinetics and linear Langmuir isotherm model. The adsorption process is non spontaneous and endothermic. The adsorption mechanism of GO-MT 1:3/100 °C for Cu 2+ involves coordination, cation-π electron interaction, electrostatic attraction and other intermolecular interactions. 3D GO-MT 1:3/100 °C can be used as an adsorbent material for selective adsorption/enrichment of Cu 2+ in aqueous solution.
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高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2022
·Vol. 70
·期 1
·68-75
·
IF 1.753
Yuanyuan Cui,Yaoyang Meng,Yun Hu,Yuqi Chen,Yixian Yang,Min Fang,Cun Li,Weiju Zhu
A novel fluorescent probe, LCH , based on dicyanisophorone and carbazole, was prepared for the visual detection of Cu 2+ . The probe LCH could recognize Cu 2+ by fluorescence quenching in EtOH/H 2 O (1/4, v/v) solution, which could be easily identified under the 365 nm UV lamp, and the detection limit was as low as 0.785 μM. The recognition mechanism of probe LCH with Cu 2+ was determined by combining 1 H NMR titration, MS, and theoretical calculations. Practical application experiments showed that probe LCH could be used to detect Cu 2+ in the test strip experiments. Cell imaging experiments showed that the probe LCH owned good cell permeability and could be applied to the imaging of Cu 2+ in HepG2 cells. In addition, fluorescence colocalization experiments showed that LCH could target lipid droplets. These results indicate that the probe LCH will have a good application prospect in environmental detection and clinical medicine.
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DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Jianping Guan,Qing He,Qi Liu,Xiaoqing Chen
Herein, by employing a novel synthesized ligand H 2 L, a flower-like luminescent metal–organic framework IRMOF-3-L was constructed for developing a triple-mode sensor for glyphosate (Glyp) detection. The ligand H 2 L was designed to contain three functional parts, which endowed the resulted IRMOF-3-L with peroxidase-like activity and unique fluorescence property, as well as specific combining capacity for Cu 2+ to quench its fluorescence. The quenched fluorescence of IRMOF-3-L/Cu 2+ could be recovered by Glyp to realize fluorescence detection of Glyp. Besides, the peroxidase activity of IRMOF-3-L/Cu 2+ could also be inhibited by Glyp, and result in the decrease of catalysate oxTMB, concurrently reducing the changes of colorimetric and SERS signal. Therefore, the fluorescent/colorimetric/SERS triple-mode based detection of Glyp was favorably realized, and the detection limits were calculated as low as 0.738, 2.26 and 0.186 nM, respectively. Furthermore, a portable test strips-smartphone sensing platform was constructed for point of care testing of Glyp in food samples.
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 4
·e53361
·
IF 3.057
Qianyong Liang,Ying Pan,Dong Zhang,Ting Lü,Hongting Zhao,Yan Zhang
Calcium cross-linked layered double hydroxide-bichar/alginate aerogel (LBCA) was synthesized by ultrasonic-assisted hydrothermal and freeze-drying method. The Mg-Al layered double hydroxide (LDH) was successfully loaded on the bichar (BC) and the LDH-BC was dispersed uniformly in the calcium alginate aerogel, which was confirmed by X-Ray Diffraction, scanning electron microscopy and BET tests. The obtained LBCA was applied to remove the Cu 2+ and Cd 2+ in the aqueous solution. As compared with LDH nanosheets, removal rates of LBCA aerogel on Cu 2+ and Cd 2+ were ranged from 59% to 94% and 45% to 86%, respectively. The adsorption kinetic data accorded with the pseudo second-order kinetic equation, and the isotherm data were in good agreement with the Langmuir model. Moreover, LBCA aerogel showed good regeneration ability, and raw materials for the fabrication of LBCA aerogel are abundant and low price.
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Qi Zhou,Deyuan Yang,Xiujuan Huang,Yuanyuan Chen,Yifeng Tu,Jilin Yan
Trypsin is a serine protease playing a key role in regulating pancreatic exocrine function and can be applied as a marker for the diagnosis of pancreatitis. In this work, a convenient and sensitive fluorescent assay was developed toward trypsin. Hydrogen peroxide slowly oxidized a non-fluorescent o-phenylenediamine (OPD) into a fluorescent product 2,3-diaminophenothiazine (DAP) under the catalytic from copper ions. After the introduction of bovine serum albumin (BSA), the combination of BSA with copper ions formed a peroxidase mimic and significantly accelerated the reaction rate. As an efficient protease, trypsin cleaved the lysine and arginine residues in BSA. This destroyed the binding between Cu 2+ and BSA, and brought in a reduction of the catalytic effect. The accompanying decrease in fluorescence provided a response to trypsin in the range of 0.01–600 ng/mL, with a detection limit of 0.007 ng/mL. The scheme had a good selectivity and was successfully applied to the detection of real samples.
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
You Lei,Yuting Gao,Yi Xiao,Pengcheng Huang,Fang-Ying Wu
Developing a fluorescence sensor capable of precisely identifying highly toxic nerve agents has become a focus of research, given that they are easily available and can be used by terrorists to threaten the security of the world. In this work, we designed a ratiometric fluorescence sensing platform with Cu 2+ -modified UiO-66-NH 2 (Cu 2+ @UiO-66-NH 2 ) and o-phenenediamine (OPD) as signal indicators and successfully used for the liquid and gas detection of the nerve agent simulant diethyl chlorophosphate (DCP). UiO-66-NH 2 obtained oxidase activity by simple Cu 2+ modification, which catalyzed the oxidation of OPD to give a yellow fluorescent product 2, 3-diaminophenazine (DAP). In this detection system, the fluorescence of UiO-66-NH 2 was greatly enhanced by blocking the ligand metal charge transfer (LMCT) process inside the framework by DCP. At the same time, the amino group of DAP was phosphorylated by DCP, and the attenuation of DAP fluorescence was observed by the static quenching effect. In addition, the Cu 2+ @UiO-66-NH 2 /OPD loaded agarose hydrogel device can be used to detect DCP vapor with naked eyes and showed satisfactory detection result (LOD: 6.65 ppb).
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhiqiang Zhang,Ruijie Chen,Lei Wang,Xueru Chen,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Photocatalytic reduction of CO 2 to methanol over SrTiO 3 (ST) perovskite oxide is considered as a promising method to alleviate environment and energy problems at the same time. Meanwhile, the inducing of Cu plays an important role in photocatalytic activity and selectivity. Herein, a series of SrTi 1-x Cu x O 3 -H 2 (STCu x -H, x = 0.04, 0.06, 0.08, and 0.1) nanofiber catalysts were prepared by electrospinning combined with in-situ dissolution strategy. Cu x O dissolved in situ on a one-dimensional nanofiber structure could realize more active sites exposed and convenient directional movement of electrons, simultaneously. The unique structure facilitates the enhancement of photocatalytic activity and the improvement of selectivity. The methanol yield of STCu 0.08 -H nanofiber catalyst upped to 5.38 ± 0.19 μmol·g −1 ·h −1 , which was twice that of ST. Moreover, the photocatalytic activity did not decrease significantly after four times of reuse. The characterization further demonstrated that STCu 0.08 -H had stronger light response ability and faster electron transfer ability than ST under the synergistic action of Cu 2+ and Cu + . STCu 0.08 -H had superior CO 2 adsorption, activation ability, and electronic reduction capability by DFT calculation. This study provided a new idea about the design of perovskite oxide nanofiber for photocatalytic CO 2 reduction.
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高影响因子
ANALYTICAL SCIENCES
·
2022
·Vol. 38
·期 2
·323-330
·
IF 1.967
Yue Jinping,Wang Wan,Lv Qing,Wang Zhijuan,Liu Yahui,Zhang Qing
A bicomponent colorimetric probe based on carbon quantum dots (CQDs) and o -phenylenediamine (OPD) was established for the detection of Cu 2+ . Theoretically, light-generated electrons from CQDs were trapped by the dissolved oxygen, resulting in the production of superoxide radicals. The colorless OPD was oxidized by the superoxide radicals to its yellow oxidation product (OPD ox ). On the other hand, Cu 2+ can bind onto the surface of CQDs and change the band gap of the CQDs. This change induces an inhibition of the photo-oxidation of OPD, thus resulting in a decrease of the absorbance of OPD ox . The mechanism was demonstrated by a series of control experiments. The parameters influencing the sensing performance as well as potential interferences were investigated. Under the optimum conditions, a limit of detection of 30 nM was achieved. Moreover, this sensing system was applied to analyze Cu 2+ in seawater and tapwater samples, and achieved satisfying results. Graphical abstract
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PubMed
高影响因子
危险品化学品经营许可证（带存储）