IRANIAN POLYMER JOURNAL
·
2023
·
IF 3.1
Zou Yilong
Heavy metal pollution is a global environmental threat that jeopardizes both human health and ecosystems. To combat this issue, the adsorption method has emerged as a cost-effective, efficient, and environmentally friendly solution. Hydrogels, three-dimensional hydrophilic polymer networks, display remarkable swelling and adsorption capabilities, making them superior to other adsorbents. They facilitate easier adsorbate transfer, resulting in enhanced adsorption efficiency. This study introduces a novel, energy-efficient approach for crafting metal-ion hydrogel adsorbents. The process involved grafting catechol groups onto chitosan (CS-CH) and then forming a hydrogel through a Schiff base reaction between CS-CH and oxidized carboxymethyl cellulose (OCMC). Successful hydrogel formation was confirmed using FTIR and UV–Vis spectroscopies. The hydrogel’s dual interaction mechanism, facilitated by catechol and amine groups, enhanced its pollutant-binding capacity. Under optimal conditions (pH = 7) and a 180-min adsorption period, the OCMC/CS-CH hydrogels exhibited significant practical adsorption efficiencies: 89.6% for Cu 2+ , 80.5% for Cd 2+ , and 91.8% for Pb 2+ ions. Subsequent experiments reaffirmed its exceptional adsorption performance for these ions. Notably, the hydrogel maintained its efficacy even after five cycles of adsorption and desorption in 0.1 mol/L HCl, showcasing its impressive regeneration potential. Collectively, the straightforward fabrication process, consistent performance, and negligible secondary pollution make this hydrogel a promising candidate for a wide array of applications in addressing heavy metal contamination. Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Rui Chen,Jinjie You,Yuge Chen,Zeming Zhang,Aili Sun,Hua Liu,Xizhi Shi
A highly selective and sensitive fluorescence sensor, using the decision tree (DT) machine learning, was successfully fabricated for the quantitative detection of Cu 2+ , which is based on near-infrared carbonized polymer dots (r-CPDs). Using o-phenylenediamine and 1,3,5-benzene tricarboxylic acid as raw materials first to synthesize the r-CPDs (quantum yield of 32.9%), which pyrrole NH ring can specifically form metal chelates with Cu 2+ hiding the electron leap result in the fluorescence burst, by a one-step hydrothermal synthesis method. Furthermore, the fluorescence sensor based on the r-CPDs was fabricated for ultra-sensitively detect Cu 2+ in the range of 0.5–80.0 nM (R 2 =0.9986) in aqueous environments and aquatic products with relative standard deviation (RSD) below 4.4% and a limit of detection (LOD) of 0.24 nM. Combined with the machine learning algorithm model, the r-CPDs fluorescence color changes accompanied by different Cu 2+ concentrations were classified. A self-developed smartphone application equipped with 3D printing technology to prepare portable cartridges successfully applied to rapid real-time detection of trace Cu 2+ in various practical samples. The experimental results show that the method has not only convenient for calculating but also accurate. Generally, this study displayed a perfect fusion of r-CPDs fluorescence sensors with machine learning which applied to the determination of Cu 2+ in environmental and aquatic products.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhentao Li,Xiuhong Huang,Licheng Lin,Yanpeng Jiao,Changren Zhou,Zonghua Liu
Bacterial overgrowth and high oxidative stress often lead to burn wound infection, hyper-inflammation, and slowed wound healing, eventually causing scar formation. Wound dressings synergized with antibacterial, antioxidant, and pro-vascularization activities can effectively promote wound healing and inhibit scars formation. Herein, chitin sponge consisted of chitin fibers was modified by the coating of proanthocyanidins (PAs) – Cu 2+ for effective scarless skin regeneration in a burn injury. The physicochemical characteristics indicated that PAs and Cu 2+ successfully modified chitin sponges by the coordination between PAs and Cu 2+ . For one thing, PAs improved the antioxidant performance of sponges, and for another, with the help of PAs, Cu 2+ effectively catalyzed S-nitrosothiols (RSNOs) to continuously generate nitric oxide (NO) in vitro/vivo for improving the inhibition of microorganisms and pro-vascularization activities. Also, Ch/PAs-Cu promoted proliferation of human umbilical vein endothelial cells (HUVECs) and rat fibroblasts (NIH-3T3), and the expression of angiogenic-related cytokines VEGF, eNOS, FGF, and MMP9. In animal experiments, Ch/PAs-Cu inhibited the accumulation of macrophages and neutrophils to regulate wound inflammation while up-regulating the expression of CD31 and α-SMA cytokines to promote angiogenesis. Ultimately, it promoted wound healing and inhibited scar formation. Therefore, Ch/PAs-Cu may be a promising dressing for the scarless repair of burned skin.
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Yi Yang,Pei Chen,Yuqing Liu,Zheng Cai,Xiyao Wang,Yang Me,Xiongyu Ding,Lan Lin,Huijun Jiang,Zhenqin Zhang,Yichun Ju
Determination of PPi levels in urine represents a measurable factor for diagnostic, treatment, and monitoring of urolithiasis. Owing to the quenching ability of Cu 2+ on fluorescent carbon dots (CDs) and strong binding affinity between Cu 2+ and PPi, we develop a new off–on assay for PPi detection using newly BPHA CDs (BPHA: N,N-bis(pyridin-2-ylmethyl)hexan-1-amine). The fluorescence intensity of BPHA CDs was significantly quenched by Cu 2+ (“off”) through forming BPHA CDs/Cu 2+ complexes and the fluorescence intensity of BPHA CDs /Cu 2+ system was completely resumed by PPi (“on”) owing to the release of free Cu 2+ . The fluorescence turn-off/on approach showed a highly selective response to PPi over the large family of other anions. The detection limits were 0.094 μM for Cu 2+ and 0.025 μM for PPi, respectively. A wide linear range for PPi was up to 4400 μM. The indicator displacement assay (IDAs) using pyrocatechol violet (PV) as a colorimetric indicator was carried out to detect PPi with the naked eyes. The “off–on” fluorescent sensor based on BPHA CDs shows many merits, including convenient operation, cost-saving, high sensitivity, selectivity, stability and wide detecting range, which is applied to PPi detection in human urine sample.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Riyue Ge,Wenxian Li,Juanjuan Huo,Ting Liao,Ningyan Cheng,Yi Du,Mingyuan Zhu,Ying Li,Jiujun Zhang
Efficient photo-electrocatalysts for hydrogen evolution reaction (HER) are synthesized using a facile one-step hydrothermal method. With metal-ion bridges, highly dispersed molybdenum disulfide (MoS 2 ) nanolayers are vertically grown on the reduced graphene oxide (RGO) to form RGO-M-MoS 2 photocatalysts for HER, where M = Fe 3+ , Co 2+ , Ni 2+ , Cu 2+ and Zn 2+ . The results show that the cross-bridging ions can modulate the MoS 2 growth priority and act as efficient charge transfer channels between RGO and MoS 2 , and combine the advantages of the high conductivity of graphene with the photo-electrochemical activity of MoS 2 . The metal-ion bridged MoS 2 -M-RGO heterostructures demonstrate superior catalytic activity toward hydrogen evolution reaction in acid medium, evidenced by the remarkable higher catalytic current density at low overpotential compared with that of MoS 2 -RGO without metal-ion bridge. This study provides a novel and facile route for establishing efficient composite photo-electrocatalysts for water splitting to generate hydrogen.
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2018
·Vol. 144
·期 2
·716-721
·
IF 3.864
Qing Juan Guo,Zi Yu Pan,Chen Men,Wen Yi Lv,Hong Yan Zou,Cheng Zhi Huang
A simple protocol for in situ growth of Cu2−xSe nanoparticles on graphene oxide hybrids (Cu2−xSe/rGO) acting as an efficient nanozyme is developed and thus a sensitive visual detection method of cancer cells is proposed. The Cu2−xSe/rGO heterogeneous nanomaterials have been proven to exhibit high peroxidase-like activity to catalyze the reaction of the peroxidase substrate in the presence of hydrogen peroxide. Herein, we used Cu2−xSe/rGO as a signal transducer to develop a colorimetric assay for the direct detection of cancer cells and a total of 63 cancer cells (MCF-7) can be distinguished by naked-eye observation. The results showed that the Cu2−xSe/rGO hybrids could be the promising nanozyme mimetics for potential applications in bioanalytical fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 9
·1733-1738
·
IF 3.741
Wang Nan,Sun Jianchao,Chen Lijian,Fan Hai,Ai Shiyun
A nanomaterial of the chemical composition Cu 2 (OH) 3 Cl-CeO 2 and with a large surface area is shown to be a viable peroxidase mimetic. It was synthesized by co-precipitation of an aqueous solution containing Ce(III) chloride, Cu(II) chloride and hexamethylenetetramine by adding an ionic liquid. The material was characterized by scanning electron microscopy and X-ray powder diffractometry. The composite possesses peroxidase-like activity and catalyzes the oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine by H 2 O 2 to produce a blue product. Based on this finding, a simple, rapid and selective colorimetric method was worked out for the determination of glucose and cholesterol by using the respective oxidases and by quantifying the H 2 O 2 formed. Both glucose and cholesterol can be determined by this method at levels as low as 50 µM.
We found that the newly synthesized Cu 2 (OH) 3 Cl-CeO 2 composite material possesses intrinsic peroxidase-like activity, and this finding was applied to design a rapid and selective colorimetric assay for H 2 O 2 , glucose and cholesterol.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 97
·94976-94988
·
IF 3.289
Longfei Liao,Ying Liu,Zengyong Li,Junping Zhuang,Yanbin Zhou,Size Chen
Amino modified Fe3O4@SiO2 (Fe3O4@SiO2–NH2) was used to immobilize Cu2+ and VO2+ for preparing Fe3O4@SiO2–NH2–Cu2+ and Fe3O4@SiO2–NH2–VO2+ catalysts. Various technologies had been used for the characteristics of catalysts, such as XRD, XPS, FT-IR, SEM, TEM and VSM. The catalytic performance of Fe3O4@SiO2–NH2–VO2+ in HMF oxidation could be significantly enhanced by the use of Fe3O4@SiO2–NH2–Cu2+ as the co-catalysts. The type of reaction solvents showed a great influence on the oxidation of HMF. The highest HMF conversion reached up to 98.7% at 110 °C in toluene with an optimal 2,5-diformylfuran yield of 85.5%. Moreover, the Fe3O4@SiO2–NH2–Cu2+ and Fe3O4@SiO2–NH2–VO2+ catalyst exhibited great stability and could be readily applied in the next recycle after magnetic separation.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Jingyu Pang,Linan Zhou,Zhuang Liang,Tingting Li,Rui Yan,Fang Chai
The determination of heavy metal ions is critical to both human health, ecosystems, and the environment because it is a prerequisite for separating heavy metal pollutants. Herein, a ratiometric fluorescent strategy based on bimetallic AuAg nanoclusters and Si nanoparticles (AuAg-SiNPs) was constructed and achieved multivariate detection of Ag + , Cu 2+ , and Hg 2+ , simultaneously. The AuAg-SiNPs exhibited dual emission centered at 456 nm and 631 nm, with quantum yield of 23.48 %, and presented visual distinguishable signal for different ions. Notably, a smartphone visual platform was created to identify Ag + , Cu 2+ , and Hg 2+ with portable and accurate capturing and recognizing changing RGB values. The quantitative evaluation can be confirmed by various noticeable ratiometric evolution responses to three ions, the limits of detection were 1.61 nM, 49.94 nM, and 1.44 nM for Ag + , Cu 2+ , and Hg 2+ , respectively. Excellent environmental tolerance as well as reliability and practicability of AuAg-SiNPs enabled their test in real water samples. The synergistic effect of aggregation-caused quenching, static quenching effect, internal filtration effect, and fluorescence resonance energy transfer were revealed in process of detection. Ratiometric fluorescent probes offer great advantages in multiple identification of heavy metals in real sample. Smartphone-assisted detection greatly improves the effectiveness of visual on-site detection and has a promising application in real samples.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Zheng Yan,Qinghua Gu,Xin Ke,Jianchao Gu,Huiping Shao
In order to address the issue of protonation of functional groups and structural instability on the surface of aerogel due to strong acidic wastewater, a three-dimensional bis-pyridine N cellulose aerogel [PEIPD/carboxymethyl cellulose (CMC)] with protonation resistance was prepared in this paper by grafting pyridine onto polyethylenimine. The adsorption capacity for Cu2+ of the as-prepared aerogel is as high as 1.64 mmol/g (pH 5) and is maintained well in high-acidity solutions (1.15 mmol/g at pH = 2). It reveals high selectivity, splendid anti-interference ability, and also reliable on the recycle performance. Through the zeta potential tests, this adsorbent reveals a rather low zero charge point (pHpzc = 2.2). The adsorption of Cu2+ on the adsorbent is consistent with the pseudo-second-order kinetic model and the Langmuir model, suggesting that the adsorption process is dominated by chemisorption in a monolayer. The characterizations by Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy proved pyridine N as responsible binding sites, based on which two possible mechanisms are proposed, including chelation and cation–π interaction. Density functional theory calculations are further used to precisely investigate the pathway. By comparing the binding energies, molecular electrostatic potentials, electron densities, and differential charge densities, the bis-pyridine N functional group is finally determined to be of much higher affinity to Cu2+ following chelation reaction as designated. By integrating bis-pyridine N with the CMC and understanding their crucial roles, this will provide significant insights into the rational design of aerogel adsorbents to enhance the recovery of Cu from strongly acidic wastewaters.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Jiahua Zhang,Dong Xu,Dongsheng Lu,Hua Wang
Construction the electrocatalysts with multiple components is an effective strategy to enhance the activity for NH 3 generation in electrocatalytic nitrate reduction reaction (NITRR). Herein, we report a high performance electrocatalyst Co 3 O 4 -Cu 2+1 O/CF. The obtained Co 3 O 4 -Cu 2+1 O/CF nanosheets not only provide large active surface area but also construct the bimetal oxides interface for exerting Cu-Co tandem catalysis. Meanwhile, Co 3 O 4 -Cu 2+1 O/CF exhibits a maximum NH 3 -Faradaic efficiency of 96.5% and NH 3 yield of 0.26 mmol h −1 cm −2 in neutral solution with 10 mM NO 3 - . The control experiments and Tafel analysis clearly manifest the tandem catalysis mechanism on Co 3 O 4 -Cu 2+1 O/CF, where Cu 2+1 O favors the NO 3 - conversion to NO 2 - , while Co 3 O 4 selectively promotes NO 2 - conversion to NH 3 . The DFT calculations reveal that the strengthened NO 3 - adsorption and the enhanced adsorption of H* on Co 3 O 4 -Cu 2+1 O/CF jointly promote the selective formation of ammonia from NO 3 - reduction. This work provides the strategy of constructing the efficient transition metal composited electrocatalysts in NITRR.
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Wang Jing,Li Shuangbao,Ren Lu,Wang Zian,Liu Yanqi,Zhang Dawei
The compounds with an imidazole structure, DHH and DHM, were synthesized using benzoyl, ammonium acetate, 2-hydroxy-5-methylisophthalaldehyde, and 2-(3-aldehyde-4-hydroxyphenyl)- 4-methylthiazole-5-carboxylate as raw materials. The structures of probes DHH and DHM were characterized by FT-IR, 1 H NMR, 13 C NMR, and HR-MS. This study found that DHH and DHM can rapidly and highly selectively recognize Cu 2+ in EtOH-H 2 O (1:1 v/v). The spectral characteristics of DHH and DHM were studied using fluorescence spectroscopy and UV–vis spectroscopy. The results show that the combination of DHH and DHM with Cu 2+ produces a significant fluorescence quenching effect, and the influence of other metal ions can be neglected. Subsequently, through Job’s plot analysis, 1 H NMR titration, and DFT calculations, the binding mechanisms of probes DHH and DHM with Cu 2+ were explored, and it was found that they coordinate in a 2:1 ratio. The experimental study on standard addition recovery showed that probes DHH and DHM could be used for the quantitative detection of Cu 2+ in actual water samples. The probes were also successfully applied to the monitoring of Cu 2+ in living cells. Graphical abstract
The compounds containing imidazole structures in probes DHH and DHM were successfully synthesized and characterized. Test strips made of DHH and DHM were used for rapid “naked-eye” detection of Cu2 + in an aqueous medium. The probes were successfully used to monitor Cu2 + in living cells and real water samples.
✓ 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）