Frontiers in Nutrition
·
2022
·
IF 6.59
Leng Xin,She Mengyao,Jin Xilang,Chen Jiao,Ma Xuehao,Chen Fulin,Li Jianli,Yang Bingqin
Copper is a vital trace metal in human body, which plays the significant roles in amounts of physiological and pathological processes. The application of copper-selective probe has attracted great interests from environmental tests to life process research, yet a few of sensitive Cu2+ tests based on on-site analysis have been reported. In this paper, a novel fluorescein-based fluorescent probe N4 was designed, synthesized, and characterized, which exhibited high selectivity and sensitivity to Cu2+ comparing with other metal ions in ethanol–water (1/1, v/v) solution. The probe N4 bonded with Cu2+ to facilitate the ring-opening, and an obvious new band at 525 nm in the fluorescence spectroscopy appeared, which could be used for naked-eye detection of Cu2+ within a broad pH range of 6–9. Meanwhile, a good linearity between the fluorescence intensity and the concentrations of Cu2+ ranged 0.1–1.5 eq. was observed, and the limit of detection of N4 to Cu2+ was calculated to be as low as 1.20 μm. In addition, the interaction mode between N4 and Cu2+ was found to be 1:1 by the Job's plot and mass experiment. Biological experiments showed that the probe N4 exhibited low biological toxicity and could be applied for Cu2+ imaging in living cells. The significant color shift associated with the production of the N4-Cu2+ complex at low micromolar concentrations under UV light endows N4 with a promising probe for field testing of trace Cu2+ ions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Kai-Ning Zhang,Cheng-Zhen Wang,Qiu-Feng Lü,Ming-Hui Chen
Functionalized two-dimensional Ti 3 C 2 T x (TN-EHL) was prepared as an effective adsorbent for removal of methylene blue dye (MB) and copper ions (Cu 2+ ). Enzymatic hydrolysis lignin (EHL), a reproducible natural resource, was used to functionalize the Ti 3 C 2 T x nanosheets. EHL can not only introduce active functional groups into TN-EHL but also prevent the oxidation of Ti 3 C 2 T x , thus promoting the adsorption performance of TN-EHL. The maximum adsorption capacities of TN-EHL50 (in which the EHL content is 50 wt%) for MB and Cu 2+ were 293.7 mg g −1 and 49.96 mg g −1 , respectively. The higher correlation coefficients ( R 2 ) of MB (0.9996) and Cu 2+ (0.9995) indicating that their adsorption processes can be described by the pseudo-second-order kinetic model. The MB adsorption data fit the Freundlich isotherm with R 2 of 0.9953, whereas the Cu 2+ ions adsorption data fit the Langmuir isotherm with R 2 of 0.9998. The thermodynamic analysis indicates that the adsorption process of MB and Cu 2+ on TN-EHL50 is spontaneous and endothermic. Significantly, the Cu 2+ ions were reduced to Cu 2 O and CuO particles during the adsorption process. Therefore, TN-EHL has a great potential as an environmentally friendly adsorbent for MB removal and recovery of Cu 2+ ions from wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2022
·Vol. 48
·期 7
·8387-8399
·
IF 2.807
Jiang Xiaodong,Wang Jiankun,Guo Jing,Liu Meiling,Fang Ying
In this study, reduced graphene oxide (RGO) with good water dispersibility and excellent adsorption performance was successfully prepared using sodium borohydride (NaBH 4 ) as reductant, and their characterization and adsorption performance for Basic Red13 (BR13) and Cu 2+ were analyzed. The results showed that RGO had an obvious graphene-like structure with the C/O ratio of 3.19, while the C/O ratio of graphene oxide (GO) was only 1.81. The reason for the good water dispersibility of RGO was the retention of partial oxygen-containing groups, especially carboxyl groups. The adsorption of RGO for BR13 and Cu 2+ was typical monolayer physisorption, which could be well-described by pseudo-first-order and Langmuir isotherm models. The maximum adsorption capacities of RGO were 1674.01 mg/g for BR13 at pH = 13 and 164.72 mg/g for Cu 2+ at pH = 6, which much higher than the corresponding values of 1258.65 mg/g and 123.14 mg/g for GO. In particular, the adsorption capacity of RGO for BR13 was the highest value reported so far. Moreover, no significant loss of adsorption performance was observed even after five cycles. This work suggested that reduced graphene oxide was an efficient adsorbent for the removal of organic dyes and heavy metal ions from water, which had great potential in pollution control applications.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 1
·160
·
IF 5.719
Rongrong Si,Yehong Chen,Daiqi Wang,Dongmei Yu,Qijun Ding,Ronggang Li,Chaojun Wu
In the present study, carboxymethyl cellulose nanofibrils (CMCNFs) with different carboxyl content (0.99–2.01 mmol/g) were prepared via controlling the ratio of monochloroacetic acid (MCA) and sodium hydroxide to Eucalyptus bleached pulp (EBP). CMCFs-PEI aerogels were obtained using the crosslinking reaction of polyethyleneimine (PEI) and CMCNFs with the aid of glutaraldehyde (GA). The effects of pH, contact time, temperature, and initial Cu2+concentration on the Cu2+removal performance of CMCNFs-PEI aerogels was highlighted. Experimental data showed that the maximum adsorption capacity of CMCNF30-PEI for Cu2+was 380.03 ± 23 mg/g, and the adsorption results were consistent with Langmuir isotherm (R2> 0.99). The theoretical maximum adsorption capacity was 616.48 mg/g. After being treated with 0.05 M EDTA solution, the aerogel retained an 85% removal performance after three adsorption–desorption cycles. X-ray photoelectron spectroscopy (XPS) results demonstrated that complexation was the main Cu2+adsorption mechanism. The excellent Cu2+adsorption capacity of CMCNFs-PEI aerogels provided another avenue for the utilization of cellulose nanofibrils in the wastewater treatment field.Keywords:carboxymethylation;cellulose nanofibrils;aerogel;adsorption
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Congming Ding,Meini Yuan,Xiaochen Cao,Xuebin Tang,Yufeng Zhao,Wenqian Hao,Jiamiao Xie
Copper salt metal compounds are widely used in the field of supercapacitor electrode material due to their rich ionic groups. In this paper, NiCo(OH) 4 /Cu 2 (OH) 3 NO 3 electrode material is prepared by the solvothermal method by doping NiCo-based hydroxide with copper salt metal compounds (Cu 2 (OH) 3 NO 3 ). NiCo(OH) 4 /Cu 2 (OH) 3 NO 3 electrode material with different morphologies and sizes is prepared by adjusting the concentration of metal salts. When the metal salt concentration is 2 M, the prepared circular sheet NiCo(OH) 4 /Cu 2 (OH) 3 NO 3 electrode material with a diameter of 3 μm and a thickness of 150 nm exhibits excellent specific capacitance (1335 C g −1 at 1 A g −1 ) and capacitance retention (after 5000 cycles, the capacitance retention rate is 71.7 %). Furthermore, the NiCo(OH) 4 /Cu 2 (OH) 3 NO 3 //AC asymmetric supercapacitor is prepared, which exhibited an energy density is 83.78 Wh kg −1 at a power density of 800 W kg −1 . The capacitance retention rate of the asymmetric supercapacitor is 65.2 % (after 5000 cycles at 10 A g −1 ). We used copper salt metal compounds (Cu 2 (OH) 3 NO 3 ) to improve the electrochemical performance of NiCo-based hydroxide electrode material. This idea has certain reference significance for improving the performance of NiCo-based hydroxide electrode material.
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
·
2021
·Vol. 36
·期 4
·951-957
·
IF 2.464
Meng Gao,Chenchen Xing,Xiaoping Jiang,Lijie Xu,Peihai Li,Chung-Der Hsiao
A novel copper ion sensing periodic mesoporous organosilica (SCN-PMO) was obtained by incorporating a Schiff base-based fluorescent receptor into the pore walls of mesoporous silica, which exhibited a well ordered mesoporous structure and excellent optical properties demonstrated by various characterization results. SCN-PMO possessed high selectivity and sensitivity towards Cu 2+ based on its specific fluorescence response. The detection limit of SCN-PMO could be as low as 6.7 × 10 −7 M. Due to protection of the silica network, SCN chromophores in PMOs exhibited higher photostability and the resulting material possessed great repeatability. Additionally, the fluorescence changes of SCN-PMO towards copper ions in vivo (zebrafish) showed that SCN-PMO has potential application as a nanoprobe in biological fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 98
·期 2
·310-318
·
IF 2.326
Sun Yangyi,Mao Yijing,Zhang Chengyu,Di Ningyu,Qi Dongming,Shentu Baoqing
In this work, organic–inorganic hybrid hollow mesoporous silica spheres (HMSs) have been synthesized by a core-template-free microemulsion method, and the thermodynamic and kinetic of the adsorption process of Cu 2+ on the HMSs are detailly investigated. Thermodynamic results showed that the adsorption process obeyed the Langmuir model with a maximum adsorption capacity of 52.0 mg/g. Kinetic studies fitted well with the pseudo-second-order model, and the intraparticle diffusion model showed that the interparticle diffusion is not the sole adsorption rate-limiting step, the adsorption process was jointly controlled by both the external surface attraction interaction and interparticle diffusion interaction between the HMSs and Cu 2+ . The adsorption capacity of different HMSs is highly depended on the surface charge and their BET surface area. These experimental results provide some theoretical guidance for the metal ions adsorption on the HMSs.
Organic–inorganic hybrid hollow mesoporous silica spheres are synthesized by a core-template-free microemulsion method, and thermodynamic and kinetic of the adsorption process of Cu 2+ are detailly investigated.
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2021
·
IF 8.207
Siyuan Sun,Weijie Bao,Fan Yang,Xingru Yan,Yang Sun,Ge Zhang,Wang Yang,Yongfeng Li
A novel strategy was developed to fabricate FeN x -doped carbon quantum dots (Fe-N-CQDs) to detect Cu 2+ ions selectively as a fluorescence probe. The Fe-N-CQDs were synthesized by an efficient electrolysis of a carbon cloth electrode, which was coated with monoatomic iron-anchored nitrogen-doped carbon (Fe-N-C). The obtained Fe-N-CQDs emitted blue fluorescence and possessed a quantum yield (QY) of 7.5%. An extremely wide linear relationship between the Cu 2+ concentration and the fluorescence intensity was obtained in the range from 100 nmol L −1 to 1000 nmol L −1 (R 2 = 0.997), and the detection limit was calculated as 59 nmol L −1 . Moreover, the Fe-N-CQDs demonstrated wide range pH compatibility between 2 and 13 due to the coordination between pyridine nitrogen and Fe 3+ , which dramatically reduced the affection of the protonation and deprotonation process between H + and Fe-N-CQDs. It is notable that the Fe-N-CQDs exhibited a rapid response in Cu 2+ detection, where stable quenching can be completed in 7 s. The mechanism of excellent selective detection of Cu 2+ was revealed by energy level simulation that the LUMO level of Fe-N-CQDs (−4.37 eV) was close to the redox potential of Cu 2+ , thus facilitating the electron transport from Fe-N-CQDs to Cu 2+ .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 23
·27576-27586
·
IF 2.478
Xue Manling,Liu Xingbin,Wu Hao,Yu Bo,Meng Fanming
Cu 2+ -doped CeO 2 @mSiO 2 (CDC@mSiO 2 ) samples with hollow structure were prepared by calcining Cu 2+ -doped cerium-based metal–organic framework (UiO-66 nanocrystals) precursor coated with mesoporous silica (mSiO 2 ). BET analysis shows that Cu 2+ -doped CeO 2 @mSiO 2 has a mesoporous structure and a large specific surface area (397.7 m 2 /g), which can provide more active sites for photocatalytic reactions. Ultraviolet absorption spectrum and PL spectrum show that the introduction of Cu 2+ makes the absorption edge of the sample red-shift and accelerate the electron–hole separation efficiency. Cu 2+ doping makes CeO 2 produce more oxygen vacancies, which promotes photocatalysis. The Cu 2+ -doped CeO 2 @mSiO 2 sample has the best photodegradation efficiency. Under simulated sunlight, the degradation rate of methyl orange within 2 h is 92.6%, and the photocatalytic rate constant is 0.0221/min. After 4 cycles of experiments, it still has excellent photocatalytic activity. Based on the characterization analysis and experimental results, the degradation mechanism of methyl orange is proposed.
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 17
·10999-11011
·
IF 5.044
Si Rongrong,Wu Chaojun,Yu Dongmei,Ding Qijun,Li Ronggang
Abstract In this study, environmentally friendly TEMPO-oxidized cellulose nanofiber (TO-CNF)/polyvinyl alcohol (PVA)/polyethyleneimine (PEI) nanoparticles were obtained by assembling PEI into TO-CNF/PVA aerogel, which was prepared by freeze-drying method with the help of glutaraldehyde. FTIR results showed that PEI likely assembled into the TO-CNF/PVA aerogel due to appearances of bending vibration of the TO-CNF/PVA/PEI nanoparticles at 1615 cm −1 . BET results further demonstrated that PEI have successfully assembled into the aerogel since the specific surface area (22.93 m 2 /g) of TO-CNF/PVA /PEI nanoparticles was lower than that (56.37 m 2 /g) of TO-CNF/PVA aerogel. SEM results also showed that PEI could obviously regulate the morphology of TO-CNF/PVA aerogel. TGA indicated that TO-CNF/PVA/PEI nanoparticles were structurally stable at 216.4 °C. The adsorption kinetics of the TO-CNF/PVA/PEI nanoparticles for copper ion (Cu 2+ ) removal presented good correlations with the Pseudo-second-order kinetic and Langmuir model ( R 2 > 0.99). Its maximum adsorption capacity for Cu 2+ according to Langmuir model was 156.8 mg/g. The adsorption equilibrium could reach in near one hour, and the adsorption efficiency could still maintain more than 80% after 3 cycles. Graphic abstract
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 15
·3945-3953
·
IF 4.157
Yang Jin,Chen Weixing,Chen Xinyu,Zhang Xi,Zhou Hongwei,Du Haotian,Wang Mingcheng,Ma Yiting,Jin Xilang
Novel spherical polymer nanoparticles were synthesized by hyperbranched polyethylenimine (hPEI) and 6-hydroxy-2-naphthaldehyde (HNA) via Schiff base reaction (one-pot reaction), which had great advantages in water solubility and green synthesis. Meanwhile, probe PEI-HNA could quickly detect Cu 2+ in the range of 0–60 μM in 30 s with the detection limit of 243 nM. The fluorescence of PEI-HNA-Cu 2+ could be recovered by the addition of S 2− in 50 s with the detection limit of 227 nM. Based on the excellent optical properties, PEI-HNA has been used in the bioimaging of living cells with excellent cell penetrability and low toxicity. More importantly, PEI-HNA has been doped into filter paper, hydrogel, and nanofibrous film to prepare solid-phase sensors, displaying rapid response and excellent sensitivity. Moreover, the low-cost and simple preparation of these sensors offers great potential and possibilities for industrialization, which could help accelerate the development of sensors in environmental and biological fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Weiyan Xi,Jiali Zhai,Lei Tian,Shuangsheng Zhou,Zipin Zhang
Based on complexation interaction between Cu 2+ and curcumin and the π-π stacking interaction between curcumin and single-walled carbon nanotubes (SWNTs), we have described a facile approach to fabrication of curcumin-Cu 2+ complex (Cu 2+ /CM/SWNTs)-modified GC electrodes through simple immersion of the curcumin/SWMTs (CM/SWNTs)-modified GC electrodes into aqueous Cu 2+ . The Cu 2+ /CM/SWNTs-modified GC electrodes exhibit highly improved stability and superior electrocatalytic activity toward electrooxidation of hydroxylamine in physiological pH in comparison with the CM/SWNTs-modified GC electrodes. By taking advantage of the efficient electrocatalytic activity of curcumin-Cu 2+ complex for hydroxylamine electrooxidation, we have demonstrated the electrocatalytic application of curcumin-Cu 2+ complex through development of an electrochemical sensor for hydroxylamine based on the Cu 2+ /CM/SWNTs-modified GC electrodes. The current response of the electrochemical sensor toward hydroxylamine concentration shows a linear relationship in the dynamic ranges of 1.0–100 µM and 100–1000 µM with a detection limit of 0.019 µM based on 3σ. The electrochemical sensor is repeatable and reproducible with RSD ≤ 4.6% (n = 3) for intra-electrode repeatability and RSD ≤ 4.1% (n = 3 electrodes) for inter-electrode reproducibility. The sensor was successfully used for selective hydroxylamine assay in pharmaceuticals samples including hydroxyurea tables and pralidoxime iodide injections with satisfactory results.
✓ 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）