SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Miao An,Hui Li,Ming Su,Shu Gao,Ming Chen Wang,Shi Gang Shen,Zhong Feng Gao,Jiang Xue Dong
In this work, the water-soluble fluorescent Ag nanoclusters (DPA @ Ag NCs) were first prepared based on D-Penicillamine (DPA) as a stabilizer, however, the fluorescence quantum yield (QY) of DPA @ Ag NCs was very low, then Cu 2+ was employed to improve the fluorescence QY and the doped Ag nanoclusters with Cu 2+ (DPA @ Ag/Cu NCs) were obtained. The study showed that the QY increased fourfold and the emission of nanoclusters changed from red to yellow after addition of Cu 2+ . The reason for change of fluorescent properties was attributed to the change of self-assembly structures caused by adding Cu 2+ into reaction system, leading to the aggregation-induced emission enhancement (AIEE) effect and enhancing the band gap (Eg) between the HOMO and LUMO in nanoclusters. Subsequently, a fluorescent Ag + sensor with high sensitivity and selectivity was established based on the DPA @ Ag/Cu NCs as probes in aqueous solution. Experiments showed that the Ag + could significantly quench the fluorescence of DPA @ Ag/Cu NCs under experimental conditions, and there was a good linear relationship between the fluorescent intensity quenching value and Ag + concentration in the range of 0.05–800 μM, and the limit of detection (LOD) was 0.03 μM (3σ/k). Meanwhile, most of common ions had no effect on the experimental results under the same conditions. In addition, the sensor was successfully applied on the detection of Ag + in real water samples, and the recovery rate was 80.3–99.0%.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2020
·Vol. 68
·期 1
·106-113
·
IF 1.554
Peipei Xu,Xiaonan Liu,Li Liu,Weiju Zhu,Cun Li,Min Fang
A new carbazole functionalized Schiff base CBM was synthesized and characterized. CBM can selectively recognize Cu 2+ via UV–vis and fluorescence signal among common biologically relevant metal ions. When Cu 2+ was added to CBM, there was a significant enhancement at the maximum absorption wavelength of 393 nm and with a distinct blue shift. The maximum emission peak was significantly attenuated by a factor of about 15 times at 535 nm and the blue shift of emission wavelength was observed. When other metal ions were added, there was no remarkable change at the maximum absorption and emission peak. Under the illumination of 365 nm ultraviolet lamp, the color of the CBM solution changed from light blue to dark blue after the addition of Cu 2+ . The combination mechanism of CBM with Cu 2+ was nicely explored by density functional theory studies. The probe CBM has good cell permeability, fluorescence electron microscopy experiments show that CBM can be used as a fluorescent probe to detect the presence or absence of Cu 2+ in Hela cells. Furthermore, the probe CBM can also be used for the detection of copper ions in actual water samples.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Songlin Fan,Zhihan Liu,Yixiao Wu,Yanjuan Zhang,Huayu Hu,Zuqiang Huang,Yuben Qin,Jing Liang
Herein, an effective adsorbent, 3D porous tubular network-structured citric acid-chitosan/Fe/polyethyleneimine beads (CCFPB) with multifunctional active groups and strong selectivity, was prepared for the selective removal of Cu 2+ from simulated wastewater. Compared with pure chitosan beads (CB), the adsorption capacity of CCFPB for Cu 2+ was increased by 127 mg g −1 (238%), and the adsorption equilibrium time was shortened by 480 min. The CCFPB showed porous surface and a novel 3D porous tubular network structure in interior, which were benefit to the diffusion of Cu 2+ from surface to interior of the CCFPB and the shortening of adsorption equilibrium time. The common coexisting ions in the simulated wastewater had almost no effect on the adsorption of Cu 2+ by CCFPB, and the adsorption was fast and reached equilibrium within 10 h. The adsorption process followed pseudo-second-order kinetics and the Langmuir isotherm model ( q m = 240.9 mg g −1 for Cu 2+ ). The adsorption mechanism of CCFPB for Cu 2+ was mainly the synergistic interaction with amino, carboxyl, and hydroxyl groups. This strategy shows great potential for developing a variety of novel, highly active, and reusable immobilized functional beads materials for effective separation of Cu 2+ from multi-ion wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Haojing Zhang,Taotao Lu,Mengjie Wang,Ruixia Jin,Yumeng Song,Yanmei Zhou,Zhichong Qi,Weifeng Chen
Biochar, a cost-effective carbonaceous material , has shown great promise in many applications such as soil remediation and wastewater treatment . Citric acid in soil and water environments may affect interactions between biochar and organic contaminants (e.g., tetracycline). To evaluate the effect of citric acid on the adsorption of tetracycline onto biochars, this study investigated the adsorption behavior of tetracycline onto biochars of two different pyrolysis temperatures (300 and 450 °C, referred to as BC_300 and BC_450) in the present of citric acid, accompanying with the effects of solution pH and Cu 2+ . The results indicated that citric acid significantly inhibited the adsorption of tetracycline onto both biochars, that was mainly due to the multi-mechanisms including pore blocking effect, surface adsorption sites competition, and steric hindrance induced by citric acid. Moreover, citric acid more significantly suppressed the adsorption of tetracycline onto the two biochars at pH 9.0 than at pH 5.0 and 7.0. Because increasing pH could promote electrostatic repulsion between the negative tetracycline and the negatively charged surface of biochars. Cu 2+ had greater enhancing effect on the sorption of tetracycline onto BC_300 than BC_450 via cation-bridging effect. Meanwhile, citric acid inhibited the adsorption of tetracycline onto BC_300 to a larger extent than the adsorption onto BC_450 in the presence of Cu 2+ . That is possibly due to BC_300 has more surface oxygen-containing functional groups than BC_450. Thus, the effect of coexisting citric acid needs to be taken into account when biochar is increasingly used as an amendment in soil and water systems.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Fangming Yang,Peng Zhou,Chunying Duan
Red dual-emissive carbon dots (CDs) were prepared by a novel and facile solvent-free carbonization method using O-phenylenediamine (OPD) as precursor and Al(NO 3 ) 3 ·9H 2 O as assistant. The prepared CDs manifesting intriguing dual-emission behavior at 600 nm and 650 nm demonstrate good fluorescence quenching rate (99%) on Cu 2+ , in which the linear range was 6–33 μM and detection limit was 0.145 μM. In addition, the CDs-Cu 2+ system shows excellent glutathione (GSH) turn-on detection in the range of 19–52 μM, where a red-shift to 650 nm and 700 nm was observed and the maximum value of F/F 0 is 5.8. Reasonable quenching mechanism was speculated to be the combination of static and dynamic quenching. Cytotoxicity measurements displayed good biocompatibility of CDs and cell viability was higher than 83% even under the highest concentration of CDs.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 8
·1-8
·
IF 5.833
Hu Cong Yi,Jiang Zhong Wei,Huang Cheng Zhi,Li Yuan Fang
Based on the laccase-mimicking activity of Cu 2+ -modified University of Oslo (UiO) metal–organic framework (UiO-67-Cu 2+ ), we developed a colorimetric sensor array for distinguishing a series of phenols with different number and position of substituted hydroxyl group (-OH) and different substituent group on the benzene ring, including phenol, catechol, quinol, resorcinol, pyrogallol, phloroglucinol, o -chlorophenol, o -aminophenol, and o -nitrophenol. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of phenolic compounds were obtained by theoretical calculation. The results show that the lower the LUMO energy level, the easier the chromogenic reaction occurs. The UiO-67-Cu 2+ -catalyzed phenol chromogenic reaction showed a good linearity in the range from 0.1 to 200 μM with limit of detection approximately 61 nM. Through the detection of phenol in tap water and river water, the recovery rate and RSD ( n = 3) were calculated as 94.1~103% and 1.0~3.3, respectively, showing good recovery, reliable results, and outstanding stability. Therefore, the proposed colorimetric sensor array will have a great potential for the detection of phenols in the environment. Graphical abstract
Schematic presentation of a simple and sensitive colorimetric strategy based on the laccase-mimicking activity of Cu 2+ -modified UiO-type metal–organic framework (MOFs, Uio-67-Cu 2+ ) to distinguish phenols with analogous structures.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Processes
·
2021
·Vol. 9
·期 10
·1829
·
IF 2.847
Liwen Zheng,Yongchao Gao,Jianhua Du,Wen Zhang,Yujie Huang,Qingqing Zhao,Luchun Duan,Yanju Liu,Ravi Naidu,Xiangliang Pan
The chitosan–EDTA modified magnetic biochar (E–CMBC) was successfully used as a novel adsorbent to remove heavy metals. The adsorption behaviour and mechanisms of E–CMBC to Cd2+, Cu2+and Ni2+were performed in single and binary system in aqueous solutions. In single–metal system, the adsorption process of Cd2+, Cu2+and Ni2+on E–CMBC fitted well with the Avrami fractional–order kinetics model and the Langmuir isotherm model. The measured maximum adsorption capacities were 61.08 mg g−1, 48.36 mg g−1and 41.17 mg g−1for Cd2+, Cu2+and Ni2+, respectively. In binary–metal system, coexisting ions have obvious competitive adsorption behaviour on E–CMBC when the concentration of heavy meal beyond 20 mg L−1. The maximum adsorption capacities of the heavy metals were found to be lower than that in single–metal system. The order of the competitive adsorption ability was Cu2+> Ni2+> Cd2+. Interestingly, in Cd2+–Cu2+system the earlier adsorbed Cd2+could be completely replaced by Cu2+from the solution. Different competitive adsorption ability of those heavy metal were due to the characteristics of heavy metal and resultant affinity of the adsorption sites on E–CMBC. The adsorption mechanism indicated that chemical adsorption played a dominating role. Therefore, E–CMBC could be a potential adsorbent for wastewater treatment.Keywords:modified biochar;heavy metals;competitive adsorption;mechanisms
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Meiqing Chen,Pingxiao Wu,Nengwu Zhu,Zhi Dang,Yingzhi Bi,Feike Pei
MgMn-layered double hydroxide (MgMn-LDH) was fabricated by a homogeneous co-precipitation method. MgMn-LDH exhibited excellent Cu 2+ immobilization with the maximum removal capacities of 668 mg·g −1 . Based on the outstanding fixation ability, the feasibility of re-utilization of spent Cu-MgMn-LDH as catalyst for drug degradation was investigated. Calcination in muffle furnace at 300 °C strengthen the stability of spent Cu-MgMn-LDH and obtained CuO-MgMn-LDO-300. As-obtained CuO-MgMn-LDO-300 consisted of CuO, Mg 2 MnO 4 and MgO. CuO-MgMn-LDO-300 exhibited superior catalytic performance, almost 97% of sulfamethoxazole (SMX) was removed within 30 min. The TOC removal for CuO-MgMn-LDO-300 reached to 76%, while that of MgMn-LDO-300 was only 5%. These were profit from convenient electronics transfer due to oxygen vacancy and synergism between Cu and Mn. Therefore, CuO-MgMn-LDO-300 could effective activate persulfate (PS) to generate 1 O 2 and SO 4 – for SMX degradation. The performance showed good adaptability in a wide pH (from 3 to 9), low dissolution of Cu and Mn verified the security of re-utilization. Moreover, more than 95% of ciprofloxacin (CIP), tetracycline (TC) and sulfadiazine (SD) could also be degraded by the obtained materials. The catalysis system of CuO-MgMn-LDO-300 was also effective applied in lake and river water contaminated by SMX. Hence, the re-utilization strategy of spent Cu-MgMn-LDH was feasible and obtained an excellent catalytic material for antibiotics degradation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Yaru Chu,Feng Gao,Fei Gao,Qingxiang Wang
The zeolitic imidazolate framework ZIF-8 was synthesized and mixed with chitosan (CS) solution to obtain a homogeneous dispersion. Then the dispersion of ZIF-8 and CS (ZIF-8-CS) modified glassy carbon electrode is fabricated and utilized for stripping voltammetric analysis of Hg 2+ , Cu 2+ , Pb 2+ and Cd 2+ for the first time. The large surface area effect and strong enriching effect of the nanosized ZIF-8 to the four heavy metal ions contribute to significantly enhance analytical signals. Under the optimum conditions, the stripping peak current densities linearly increased with Hg 2+ concentration in the range from 1.0 μM to 80.0 μM, and with Cu 2+ , Pb 2+ and Cd 2+ concentrations in the range from 1.0 μM to 100.0 μM. The analytical sensitivity for the four ions are estimated to be 14.20 μA·μM −1 ·cm −2 (Hg 2+ ), 2.797 μA·μM −1 ·cm −2 (Cu 2+ ), 5.203 μA·μM −1 ·cm −2 (Pb 2+ ) and 1.390 μA·μM −1 ·cm −2 (Cd 2+ ), respectively. The limits of detection for the four ions were estimated to be 0.0293 μM (Hg 2+ ), 0.108 μM (Cu 2+ ), 0.0619 μM (Pb 2+ ) and 0.135 μM (Cd 2+ ), respectively. The ZIF-8 based modified electrode also presented excellent anti-interference ability, and good reliability for monitoring the four ions in real water samples.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2019
·
IF 1.859
Lili Chang,Qiang Gao,Shu Liu,Dan Luo,Bo Han,Kaisheng Xia,Chenggang Zhou
Sensing detection of Hg 2+ and Cu 2+ with use of a single organic probe is of practical importance, but there still remains a great challenge to implement the detection in pure aqueous media while avoiding mutual interference. Herein, a novel polymer chemosensor, P(META-co-RhBH–HB–Ac), was fabricated by incorporating rhodamine hydrazone moieties into a quaternary ammonium-type poly(ionic liquid). With the positively charged character of polymeric backbone, the P(META-co-RhBH–HB–Ac) exhibited a high solubility in water, and possessed a potential advantage in minimizing nonspecific binding. More importantly, the P(META-co-RhBH–HB–Ac) could serve as a dual-analyte chemosensor for differential recognition of Hg 2+ and Cu 2+ in pure aqueous media based on unique UV irradiation-dependent response behaviors. Specifically, Hg 2+ was exclusively sensed through fluorescence enhancement in the absence of UV irradiation, while selective colorimetric response to Cu 2+ was achieved under UV irradiation. Particularly, benefitting from the electrostatic effect of META units on RhBH–HB–Ac receptors, the P(META-co-RhBH–HB–Ac) could discriminate Hg 2+ and Cu 2+ under their coexistence without occurrence of mutual interference. Consequently, selective and differential determination of Hg 2+ and Cu 2+ under pure aqueous conditions was achieved, which proved to be applicable for quantitative analysis of real water samples.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 7
·3408-3414
·
IF 10.733
Song Ma,Kai Chen,Yun-Hang Qiu,Li-Li Gong,Gui-Min Pan,Yong-Jie Lin,Zhong-Hua Hao,Li Zhou,Qu-Quan Wang
Substantial effort has been devoted to synthesizing plasmonic metal/semiconductor heteronanostructures with controlled morphology owing to their excellent performance ranging from photocatalysis to optical information processing. However, growing semiconductor heterojunctions with both counterparts in direct contact with the plasmonic metal nanostructures remains challenging. Herein, we report a three-step method to grow CdS–Cu2−xS lateral heteroshells on Au nanoparticles with all components directly connected with each other. Ag2S semi shells are initially grown on the Au nanoparticles as an interim layer, Cu2−xS semi shells are then grown on the uncovered surface of the Au nanoparticles, and CdS is generated by replacing Ag2S and the Au core complex with CdS–Cu2−xS lateral heteroshells Au/CdS–Cu2−xS is finally obtained. These complexes integrate the plasmon resonances of Au in the visible region and that of Cu2−xS in the near-infrared region, and therefore show improved photocatalytic activity and high photothermal efficiency. This study offers a synthetic approach to grow metal sulfides on Au nanostructures which have diverse applications in photocatalysis and photothermal therapy.
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Jingcheng Du,Cailong Zhou,Zhijie Yang,Jiang Cheng,Yuanyuan Shen,Xinjuan Zeng,Luxi Tan,Lichun Dong
The economic and green synthesis of metal-organic frameworks (MOFs) is of great significance. In this work, a facile method for preparing HKUST-1 MOFs at room temperature with insoluble Cu 2 (OH) 2 CO 3 particles and film as the precursors was developed. The as-prepared HKUST-1 MOFs were characterized by using the XRD , Raman spectrum , FTIR, XPS and N 2 adsorption-desorption analyses, and the wetting property of the HKUST-1 film was also evaluated. The results demonstrated that the MOF film decorated copper mesh possesses the promising underwater superoleophobicity and underoil superhydrophobicity, with the contact angles of non-wetting liquids larger than 150°. The on-demand oil/water separation was subsequently realized through a prewetting method, obtaining the high separation efficiency up to 97%. The facile route by using solid precursors developed in this work might provide a new strategy for preparing MOFs, and the special wetting properties of the as-prepared materials could enrich the applications of MOF films as well.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）