JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Jingwen Pan,Baoyu Gao,Pijun Duan,Kangying Guo,Xing Xu,Qinyan Yue
Herein, we attempted to apply an exhausted magnetic biochar with adsorbed Cu 2+ (Cu-Fe@BRC) directly as a PMS activator and explored the feasibility of this attempt. Density functional theory (DFT) and electrochemical analysis illuminated the adsorbed Cu 2+ in Cu-Fe@BRC improved PMS activation and NOR degradation efficiency by elevating the adsorption capacity of PMS and performance of electron transfer . About 91.47% of norfloxacin (NOR) was rapidly degraded in Cu-Fe@BRC/PMS system with low Fe and Cu leaching. An in-depth mechanistic study was conducted with radical scavenging, radical capturing and solvent exchange, which demonstrated that the adsorbed Cu 2+ could facilitate the formation of both different radicals and non-radical. Importantly, Cu-Fe@BRC can maintain a long-term stable operation and excellent catalytic performance in surface water treatment . The potential toxicity of by-product generated in the NOR degradation process was also predicated, and results suggested that most identified by-products were less toxic than NOR itself. Notably, the preparation cost of exhausted adsorbent-based catalysts could be negligible, so the expenditure of the corresponding oxidation process is reduced accordingly. Based on above, this work provides not only a low-cost exhausted biochar-based catalyst for water purification but also the insight into the PMS activation by adsorbed transition metal ions .
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Jun Wan,You Shen,Liqiang Xu,Ruixue Xu,Jinfan Zhang,Haodi Sun,Chongyu Zhang,Chuanxia Yin,Xinxing Wang
The development of selective electrochemical response materials and new detection strategies are the research focus in the field of heavy metal ion (HMI) electroanalysis. Herein, a Ni(II)-based metal-organic framework (NH 2 -Ni-MOF) was synthesized and functionalized by electrochemically active molecule of ferrocene (Fc) via post-synthesis modification. Based on the Fc-functionalized NH 2 -Ni-MOF (Fc-NH 2 -Ni-MOF), a novel electrochemical ratiometric sensing platform was developed and applied for the simultaneous determination of various HMIs. The prepared NH 2 -Ni-MOF exhibits nanoplate structure, which is conducive to increase accessible electrode area and expose more active sites, thus promoting the adsorption and pre-concentration of HMIs. The modification of Fc on MOF not only enhances the electrical conductivity of the MOF material, but also provides an internal reference signal for the ratiometric analysis. Due to the excellent characteristics of the Fc-NH 2 -Ni-MOF, the as-prepared ratiometric electrochemical sensing platform exhibits wide linear ranges (0.001 μM to 2.0 μM for lead ions (Pb 2+ ), and 0.01 μM to 2.0 μM for copper ions (Cu 2+ ) as well as cadmium ions (Cd 2+ )) and high sensitivity (the detection limit toward Cu 2+ , Pb 2+ and Cd 2+ is 6.3 nM, 0.2 nM and 7.1 nM, respectively). In addition, compared with the non-ratiometric strategy, the reproducibility of ratiometric analysis is significantly improved. The developed electrochemical method with high sensitivity, selectivity and reliability exhibits bright application prospects in the detection of real samples. Moreover, the electrochemical application of MOF materials has been effectively expanded.
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Guichen Gong,Jie Liu,Yuexin Han,Yimin Zhu
Cu 2+ was found to have intensive and selective depressing effects on fluorite in the flotation separation of cassiterite from fluorite using 2-carboxyethylphenylphosphinic acid (CEPPA) as a collector at pH 4.0. The depressing mechanism was investigated by flotation tests, zeta potential measurements, X-ray photoelectron spectroscopy (XPS) analyses and density functional theory (DFT) calculations. Flotation test results demonstrated that Cu 2+ selectively depressed the fluorite in an artificially mixed cassiterite-fluorite ore. Zeta potential measurement and XPS analysis results indicated that Cu 2+ could be anchored on cassiterite surface by adsorption or substitution but not on fluorite surface, and the adsorption of CEPPA on fluorite surface was cut off by Cu 2+ . DFT calculation results demonstrated that CEPPA had stronger affinity for Cu 2+ than for fluorite, and the adsorption or substitution of Cu 2+ on cassiterite (110) surface showed no negative effects on the adsorption of CEPPA monoanion on cassiterite (110) surface. Based on these results, the depressing mechanism of Cu 2+ on fluorite was that Cu 2+ consumed the collector CEPPA in solution, and little free CEPPA was left to be adsorbed on fluorite surface while the adsorption of CEPPA on cassiterite was normal. Thus, the floatation of fluorite was selectively and intensively weakened.
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Polymer Chemistry
·
2020
·Vol. 11
·期 41
·6688-6700
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IF 5.342
Na Li,Xiaosai Qu,Lifeng Wang,Qingquan Tian,Yu Chen,Xianping Yao,Shusen Chen,Shaohua Jin
Aiming at solving the uncontrollability in the properties of chitosan caused by its uncontrollable structure, we synthesized two chitosan-mimetic polymers, the homopolymer mimic PHNI and the copolymer mimic PHNI-PHNIA, by ring-opening metathesis polymerization (ROMP) and characterized their structures and performances by FTIR, 1H-NMR, 13C-NMR, XRD and DTG. The reaction feature of ROMP demonstrated by size exclusion chromatography (SEC) signifies that the structure and number average molecular weight of ROMP products can be controlled by tuning the ratio of the monomer to the catalyst, and thus the mimics exhibit structure-controllable and mimicking properties. The relationship between the chemical structure and performance of the mimics is more explicit. The application exploration suggests that the Cu2+ adsorption performance of the PHNI-PHNIA hydrogel prepared with glutaraldehyde as the crosslinking agent is superior to that of the chitosan hydrogel. The catalytic activity of the PHNI-PHNIA-Cu2+ complex for the decomposition of H2O2 is much higher than that of the chitosan-Cu2+ complex. Our work has provided a new strategy for the synthesis of controllable chitosan mimics that can function as a substitute of basic polysaccharides for preparing the derivatives with controllable properties and expand the application scope of chitosan.
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ANALYST
·
2020
·Vol. 145
·期 8
·2995-3001
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IF 3.978
Yu Ma,Maotian Xu,Yongxiang Wang,Zi Liu,Baoxian Ye
This work reports the first example of a colorimetric H2S sensor constructed through G-quadruplex-Cu2+ (G4-Cu2+) peroxidase mimetics employing Cu2+ ions and G-rich DNA with signal amplification. In the hydrogen peroxide (H2O2)-mediated oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB), the catalytic capacity of Cu2+ can be greatly improved in the presence of 22AG DNA, where 22AG DNA acts as a signal amplifier. However, G4-Cu2+ peroxidase mimetics lose their catalytic abilities after reacting with H2S. This is employed to develop a colorimetric assay of H2S without complex synthesis and instrumentation, with a linear range from 0.01 μM to 150 μM and a detection limit of 7.5 nM. The sensitivity of the sensor can also be adjusted by changing the concentration of Cu2+. Moreover, the developed sensor is successfully applied for the quantitative determination of H2S in human serum samples.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Can Chen,Guotong Ruan,Yujie Sun,Lili Wang,Chengwu Zhang,Jinhua Liu
As inorganic pyrophosphatase (PPase) gets involved in the regulation of various pathophysiological procedures, rapid and effective detection of its activity is of great value for monitoring and managing PPase-related diseases. Herein, an in situ Cu 2+ -triggered wavelength-tunable fluorescent sensor for high sensitivity monitoring of PPase activity is constructed. The proposed sensor is based on the principle of Cu 2+ -triggered polymerization of dopamine (DA) and m-phenylenediamine (MPD), the stronger coupling effect of pyrophosphate ion (PPi) and Cu 2+ , and the effective hydrolysis of PPase to PPi. With the change of substituents of MPD, the wavelength of fluorescence polymer nanoparticles (FPNPs) exhibits tunable capacity from 535 nm to 565 nm. Compared with the traditional detection method, as developed sensor shows high sensitivity to PPase with a low detection limit of 0.333 mU/mL in green channel and 0.033 mU/mL in orange channel. Additionally, the sensor realizes PPase sensing in the diluted human serum with excellent recovery in both green and orange models. Furthermore, this sensor is also applicable for inhibition assay of PPase (NaF: IC 50 of 134.7 μM) and logic gates construction. Summarily, as prepared sensor provides one better way for monitoring PPase in diagnostic as well as drug screening.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Haochen Qi,Xiaofan Huang,Jayne Wu,Jian Zhang,Fei Wang,Hao Qu,Lei Zheng
Copper ion (Cu 2+ ) is an important cofactor for many enzymes in human body. Either excessive or deficient Cu 2+ in the body may cause serious dysfunctions and diseases. So sensitive determination of Cu 2+ in environmental samples is of more significance for evaluation and control of Cu 2+ intake. Based on a low-cost gold-plated coplanar electrode array, a disposable aptasensor is developed with an ultra-sensitive indicator of interfacial capacitance. Modified with a specially isolated DNA aptamer for Cu 2+ , this sensor achieves a high selectivity of 1207: 1 against non-target ions. To realize real-time response, alternating-current electrothermal effect is integrated into the capacitance measuring process to efficiently enrich the trace Cu 2+ . This sensor reaches a limit of detection of 2.97 fM, with a linear range from 5.0 fM to 50 pM. The response time is only 15 s, which can meet the real-time detection requirement. On-site test of practical samples is also realized using the disposable sensor combined with a handheld inductance/capacitance/resistance meter. This sensor with its portable test system provides a cost-efficient solution for on-site, real-time and sensitive detection of Cu 2+ , showing great application value in environment monitoring.
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TALANTA
·
2021
·
IF 6.057
Xuemin Huang,Qingfeng Liu,Cuimin Wu,Zhenyu Lin,Aiwen Huang,Bin Qiu
As a popular controllable-released carrier, intelligent hydrogels are often used in drug delivery and disease therapeutics. Meanwhile, benefit from the mimic-enzyme activity performance, Fe–N–C nanozymes have been widely used in sensing and analysis. However, the combination of intelligent hydrogels with specific degradability and Fe–N–C nanozymes with enhanced activity in one system to achieve controllable and sensitive detection is rare. Herein, we combine intelligent hydrogel with mimic peroxidase activity enhanced Fe–N–C nanozymes to construct a ratiometric fluorescence probe for sensitive detection of hyaluronidase (HAase). The modification of copper ions has been proved to enhance the mimic enzyme activity of Fe–N–C nanozymes greatly. Cu 2+ modified Fe–N–C nanozymes were embedded in hyaluronic acid hydrogel. In the presence of HAase, the HA hydrogel structure was hydrolyzed and released Cu 2+ -Fe-N-C nanozymes gradually. The released Cu 2+ -Fe-N-C nanozymes are used to catalyze the hydrogen peroxide system so that o-phenylenediamine is oxidized to orange fluorescent 2, 3-diaminophenolazine (DAP). Due to the electrostatic interaction , the fluorescence resonance energy transfer can occur between the negatively charged copper nanoclusters emitted by 430 nm and the positively charged DAP emitted by 560 nm. The activity of HAase was monitored according to the ratio of fluorescence intensity at 560 nm and 430 nm (F560/F430). The linear range of this method is 0–10.0 U/ml and the detection limit is 0.43 U/mL (S/N = 3). This strategy has been further applied to biological samples successfully.
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RSC Advances
·
2021
·Vol. 11
·期 55
·34525-34532
·
IF 3.361
Chen-Fang Miao,Xian-Zhong Guo,Xin-Tian Zhang,Yin-Ning Lin,Wen-Di Han,Zheng-Jun Huang,Shao-Huang Weng
The monitoring of deferasirox (DEF) has important clinical roles in patients who need iron excretion. However, analytical methods with practicability and simplicity are limited. Moreover, ratiometric fluorescence strategies based on Förster resonance energy transfer (FRET) from carbon dots (CDs) as a donor are rarely reported as a drug monitor. In this work, CDs with an appropriate emitting wavelength at 480 nm and excitation around 370 nm were prepared by hydrothermal approach and HCl post-treatment. O-Phenylenediamine (OPD) can be oxidized by Cu2+ to produce yellow fluorescent 2,3-diaminophenazine (oxOPD) in the system of Cu2+ and OPD (Cu–OPD). Correspondingly, a remarkable FRET from CDs to oxOPD in the system of CDs, Cu2+ and OPD (CDs–Cu–OPD) was fabricated with the quenching illustration of CDs, but emitting property of oxOPD. Attributed to the chelation ability of DEF on Cu2+, the inhibitory effects of DEF on the Cu2+-triggered oxidative capability reduced the FRET system by the decreased oxOPD. Thus, the recovered CDs at F480 and decreased oxOPD at F560 were found through a ratiometric mode by the addition of DEF in CDs–Cu–OPD for the DEF assay. The FRET behavior of CDs and oxOPD in CDs–Cu–OPD was proved clearly through the calculation of the association constant, binding constant, number of binding sites, and the distance between the donor and acceptor. Furthermore, this ratiometric method exhibited promising analytical performance for DEF with the application in real samples. The implementation of this work expands the application field of CDs and OPD oxidation in drug monitoring, and even other biological analyses through ratiometric strategy.
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RSC Advances
·
2019
·Vol. 9
·期 66
·38568-38575
·
IF 3.049
Jinping Song,Qi Ma,Yequn Liu,Yong Guo,Feng Feng,Shaomin Shuang
In this study, dual-emission carbon dots (D-CDs) are synthesized via a simple one-step solvothermal treatment of red tea. The obtained D-CDs are characterized by XPS, IR, TEM, XRD, fluorescence and UV-vis spectroscopy techniques. It is found that D-CDs present a strong red fluorescence emission peak at 671 nm and weak blue fluorescence emission peak at 478 nm under the excitation wavelength of 410 nm. The unique dual-emission properties of D-CDs provide great opportunities in ratiometric fluorescence sensing applications. The results show that Cu2+ ions can quench the fluorescence of the red emission band of D-CDs effectively, resulting in the disappearance of red fluorescence ultimately. Upon the addition of Al3+ ions, the fluorescence of blue emission band at 478 nm grows apparently, and the fluorescence color transforms gradually from red to orange, then to yellow-green. Based on these findings, a novel ratiometric fluorescence and colorimetric dual mode nanosensor is developed for simultaneous detection of Cu2+ and Al3+ ions. Regarding Cu2+ ions, the fluorescent detection linear range is 0.1–50 μM with detection limit of 0.1 μM, and the colorimetric detection limit is estimated as 25 μM. With regard to Al3+ ions, the fluorescent detection linear range is 0–20 μM and 25–100 μM with detection limit of 0.5 μM, and the colorimetric detection limit is 20 μM. Furthermore, the fluorescence response mechanisms of Cu2+ and Al3+ ions were discussed detailed. To the best of our current knowledge, this will be the first research work on the simultaneous determination of Cu2+ and Al3+ using D-CDs as fluorescent probes.
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Polymer-Plastics Technology and Materials
·
2019
·
IF 0
Ying Pan,Ke Ke,Lin Cheng,Hongting Zhao
In this study, flexible polyurethane foam (FPUF) was successfully coated with nano-Mg(OH)2 platelets. Due to the strong interaction between chitosan and nano-Mg(OH)2, it was possible to yield modified foam with a weight-gain of up to 15 wt% by depositing one chitosan layer and one nano-Mg(OH)2 layer. Meanwhile, the adsorption isotherms of Cu2+ on FPUF covered with 10 wt% coating (FPUF-10) shows the Langmuir behavior. It was found that for the FPUF-10, the removal % for Cu2+ after 30 min and 50 min treatment were 86% and 90%, respectively. Moreover, the maximum removal % could reach up to 95%.
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CRYSTENGCOMM
·
2018
·Vol. 20
·期 28
·4020-4024
·
IF 3.304
Xin Huang,Yu Zou,Jian Hao,Jiang Jiang
Uniform ZnSe hollow nanospheres with face-centered cubic structure were synthesized via a post-synthetic chemical transformation reaction from solid Cu2−xSe nanocrystals, with the help of tributylphosphine at room temperature under an ambient atmosphere. The formation of ZnSe hollow structure was based on the synergetic effect of isotropic cation exchange from Cu2−xSe to ZnSe and concurrent selective etching of Cu2−xSe templates through anion extraction. The degree of hollowness could be adjusted by changing the feed molar ratio of Zn/Cu and reaction temperature which determined the extent of cation exchange. These ZnSe hollow nanospheres exhibited excellent catalytic activity and stability for the photodegradation of dyes.
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