JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Yong Feng,Po-Heng Lee,Deli Wu,Zhengyuan Zhou,Hangkong Li,Kaimin Shih
Copper ions (Cu 2+ and Cu + ) have shown potential as Fenton-like activators for the circumneutral removal of organic contaminants from aqueous solutions. However, the major active species (cupryl species (Cu 3+ ) versus hydroxyl radical ( OH)) produced during the activation of hydrogen peroxide by Cu + remain unclear. In this study, Cu + -O 2 oxidation, in which hydrogen peroxide is produced via the activated decomposition of dissolved molecular oxygen, was used to degrade sulfadiazine, methylene blue, and benzoic acid. The results showed that both sulfadiazine and methylene blue could be efficiently degraded by Cu + -O 2 oxidation in a wide effective pH range from 2.0 to 10.0. Quenching experiments with different alcohols and the effect of Br − suggested that Cu 3+ rather than OH was the major active species. Electron paramagnetic resonance detected 5,5-dimethyl-2-hydroxypyrrolidine-N-oxyl (DMPO-OH), which was probably produced by the oxidation of DMPO by Cu 3+ or OH formed as a product of Cu 3+ decomposition. 4-hydroxybenzoic acid was produced during the degradation of benzoic acid by Cu 3+ . The findings of this study may help to explain the inconsistency regarding the dominant active species produced by the interaction of Cu + and hydrogen peroxide.
研究领域:
环境科学
·
化学
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DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Lin Wang,Feng Li,Sufang Wang,Jinsong Wu,Wenhui Zhang,Yan Zhang,Wentao Liu
The application of enzyme-inorganic hybrid nanoflowers in time-temperature indicators (TTIs) was studied for the first time. Lipase@Cu 3 (PO 4 ) 2 hybrid nanoflowers were prepared by the interaction between lipase and copper ions. Compared with free lipase, the activity of lipase in the nanoflowers was increased by 137%, and the storage stability was also improved significantly. Based on the enzymatic reaction between lipase and glycerol triacetate, six TTI prototypes with different concentrations of lipase@Cu 3 (PO 4 ) 2 hybrid nanoflowers were investigated. The color of the six TTIs changed from purple to yellow, and finally to green, and the activation energies were 46.86 kJ/mol, 51.17 kJ/mol, 54.99 kJ/mol, 60.00 kJ/mol, 62.17 kJ/mol, and 65.63 kJ/mol, respectively. The shelf life of TTIs can be determined by changing the ratio of lipase@Cu 3 (PO 4 ) 2 hybrid nanoflowers to glycerol triacetate, therefore the TTIs can be easily applied to real-time safety evaluation of many perishable foods.
研究领域:
食品科学
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生物化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaoping Liu,Yunbo Zhai,Zhixiang Xu,Liming Liu,Wanying Ren,Yu Xie,Caiting Li,Yun Zhu,Min Xu
The high water content of sewage sludge increases the processing costs and hampers its further disposal. Fenton technology has proven to be efficient and been widely used to enhance sludge dewaterability, but it usually needs acidification and subsequent neutralization, thus consuming a lot of chemicals. It’s well documented that hydroxyl radicals produced in various Fenton or Fenton-like reactions play a crucial role in sludge dewatering. Based on the latest study, Cu + and Cu + /H 2 O 2 pretreatments for the enhanced dewaterability of sludge without extra pH adjustment were proposed. Results showed that Cu + with and without H 2 O 2 can significantly improve the dewatering performance of sludge, which was ascertained by a capillary suction time (CST) reduction rate of about 80 %. The proteins and polysaccharides in tightly-bound extracellular polymeric substance (TB-EPS) were decreased, while increased in soluble extracellular polymeric substance (S-EPS). In addition, a hydrophobic and porous surface was formed, and zeta potential increased after conditioned. These changes may release bound water and thus improve sludge dewaterability. The results of electron spin resonance and scavenging tests signaled that the Cu 3+ was mainly accountable for the dissolution of EPS, rather than the hydroxyl radicals ( OH). Our results substantiate and untangle a distinct reinforcement mechanisms for sludge dewatering by high valent copper (Cu 3+ ). This study demonstrates for the first time that Cu 3+ plays an important role in sludge dewatering, which has long been credited to hydroxyl radicals. It also urges re-evaluation of the Fenton(-like) system for sludge dewatering, given that Cu 3+ could also cause potential oxidative destruction of EPS compared with reactive oxygen species.
研究领域:
环境科学
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污水处理
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化学工程
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DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Chunyun Ma,Yan Zhang,Chuankai Yang,Miaorong Zhang,Jianguo Tang
Lipase was immobilized with Cu 3 (PO 4 ) 2 ⋅3H 2 O to synthesize lipase-Cu 3 (PO 4 ) 2 ⋅3H 2 O hybrid microflowers (Lip-MFs). Surfactants (Tween 80, Triton X-100 and CTAB) were added to study their effect on the morphology and activity of Lip-MFs. SEM images revealed that surfactants can increase the size of Lip-MFs and make the hierarchical structure more compact. Further, compared with other surfactants, the activity of CTAB-Lip-MFs was 1.45 times of that of free lipase, demonstrating CTAB is conducive to improve the activity of lipase.
研究领域:
生物化学
·
材料科学
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DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Sijin Cai,Xingpeng Huang,Manyu Luo,Deshou Xiong,Wei Pang,Meiling Wang,Li Wang,Shuang Li,Peng Luo,Zhixian Gao
Sensitive detection of ammonia in the environment is crucial due to its potential danger to human ecology and health. In gas detection technology, resistive sensors utilizing golden cross finger electrodes combined with gas-sensitive materials are commonly employed. In this study, we demonstrated a room-temperature sensor for ambient ammonia detection. The sensor is composed of two-dimensional layer-stacked metal-organic framework (MOF) Cu 3 (HITP) 2 nanomaterials drop-coated onto gold-forked finger electrodes. Density-functional theory simulation (DFT) and sensor gas-sensitive performance testing were conducted for characterization. The sensor exhibited high sensitivity, selectivity, low detection limit, excellent reproducibility, and stability. This can be attributed to the abundant Cu active sites exposed in the hexagonal ring and layer-stacked framework structure of Cu 3 (HITP) 2 nanomaterials. Ammonia adsorption leads to electron transfer into the Cu 3 (HITP) 2 framework, resulting in decreased sensor resistance. Real-time monitoring of sensor resistance changes enabled quantitative analysis. Results showed a 91.4 % response of the Cu 3 (HITP) 2 sensor to 100 ppm NH 3 , with response and recovery times of 26 s and 20 s, respectively. The sensor's limit of detection (LOD) was approximately 15 ppb. The sensor exhibited a relatively high response to NH 3 at 25 °C, as demonstrated by dynamic gradient test curves. These findings suggest that constituting a room-temperature ammonia sensor by uniformly drop-coating Cu 3 (HITP) 2 onto a gold-forked finger electrode is a feasible strategy.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ruiui Hao,Kaijia Zhang,Guohong Wang
Developing a low-cost, stable but efficient heterojunction photocatalyst is very crucial and challenging. A multivalent TiO 2 @Cu 3 (BTC) 2 heterojunction photocatalyst with active copper center has been prepared by a simple solvothermal method. In the photocatalytic process, photogenerated electrons produced by TiO 2 are transferred to the copper center in Cu 3 (BTC) 2 , partially reducing Cu 2+ and forming a highly active Cu 2+ /Cu + mixed center. This electron transfer path effectively increases the carrier density and prolongs the lifetime of the photogenerated charge. Under the optimal composite ratio, the hydrogen production activity of the TiO 2 @Cu 3 (BTC) 2 heterojunction photocatalyst was significantly enhanced, exceeding that of TiO 2 (8.39 μmol·g −1 ·h −1 ) by a factor of 72.2 times, and overcoming the barrier of no hydrogen production activity in pure Cu 3 (BTC) 2 . Additionally, the heterojunction photocatalyst demonstrated excellent chemical and photocatalytic stability over a period of at least 200 days. The enhanced photocatalytic activity is attributed to the improved visible light absorption efficiency, the effective heterojunction interfaces, particularly the highly active Cu 2+ /Cu + mixed center formed. Importantly, noble metal was not used in the photocatalytic hydrogen production process. Instead, Cu 2+ /Cu + were employed as active centers, making it possible to synthesize low-cost photocatalysts. This work provides conceptual guidance for the development of highly efficient multivalent TiO 2 -based heterojunction photocatalysts.
研究领域:
材料科学
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能源化学
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光催化技术
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DOI
高影响因子
Small
·
2019
·Vol. 15
·期 17
·1805478
·
IF 10.856
Kai Jia,Jiahua Ye,Guoxin Zhuang,Zanyong Zhuang,Yan Yu
Fabrication of low-dimensional nano-MOFs as well as nanoparticles/metal-organic frameworks (MOFs) hybrids has sparked new scientific interests but remains a challenging task. Taking Cu 3 (BTC) 2 as a proof of concept, it is demonstrated thats NH 3 ⋅H 2 O solution of a confined pH value can readily shape the bulk Cu 3 (BTC) 2 into nanoscale Cu 3 (BTC) 2 , beyond the need to control the crystal growth kinetics of MOFs. Adjusting the pH of NH 3 ⋅H 2 O within a much small range (10–11) allows fine tuning over the size and shape of nanoscale Cu 3 (BTC) 2 . Particularly at pH = 11, NH 3 ⋅H 2 O exhibits weak reducibility that triggers a reduction of part of Cu 3 (BTC) 2 into Cu 2 O, while shaping the other into Cu 3 (BTC) 2 nanowires. Benefiting from the coincidence of reduction and etching effects, the newly generated Cu 2 O dots can in situ anchor onto adjacent Cu 3 (BTC) 2 nanowires at highly dispersive state, forming a well-defined sponge-like architecture built of Cu 2 O dots and nano-Cu 3 (BTC) 2 . The CuO x derived from annealing of the Cu 2 O dots/nano-Cu 3 (BTC) 2 hybrid preserves the sophisticated sponge architecture and high porosity, and exhibits promising applications in phenol scavenging, with efficiency outperforming its counterparts and many other Cu-based catalysts reported in literature. It is anticipated that the findings here pave the way for the rational design of intricate nano-MOFs in a more efficient way.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 9
·e5783
·
IF 3.14
Wenpeng Gong,Li Zhang,Ying Yu,Bixia Lin,Yumin Wang,Yujuan Cao,Manli Guo
In this paper, cobalt ion was employed to modify Cu 3 (BTC) 2 to improve the adsorption property for formaldehyde gas. The cobalt ion was doped during the synthesis of Cu 3 (BTC) 2 to form a product of CuCo-BTC. As the optimization assay indicated, when the molar ratio of the Co 2+ /Cu 2+ was 3/17, the adsorption amount for formaldehyde gas achieved the maximum, which is 1.6-fold to that of Cu 3 (BTC) 2 . ICP-MS, XPS, XRD, FT-IR, SEM and N 2 adsorption–desorption were used to investigate the structure and property of the CuCo-BTC. Subsequently, the adsorption kinetic process of the CuCo-BTC was assessed, the result suggests it coinciding to the pseudo first-order kinetic model which belongs to the physical adsorption process. The further assays indicated the CuCo-BTC possessing higher and faster colorimetric response to formaldehyde with indicator than other metal organic framework materials or common indicators. Therefore, it was utilized to fabricate a functional paper chip to perform the visualized detection of formaldehyde gas. The result displayed a sensitive response to formaldehyde gas in the concentration range of 0.02 ~ 0.08 mg/m 3 . Besides, the whole colorimetric assay merely takes 150 s, suggesting a favorable application prospect in the on-site test of detrimental gas.
研究领域:
材料科学
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环境科学
·
化学
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Runhao Yuan,Xiaolong Zhong,Weiming Sun,Jian Wang,Chuanhui Huang,Zhenyu Lin,Jianping Zheng
Background Bulk-type conductive metal-organic frameworks (c-MOFs) had been applied to modify the electrode and used in electrochemical sensing because of the high conductive properties. But which still suffer from low mass permeability, restricted active site exposure, and poor accessibility due to the coordination saturation at metal sites in the bulk-type c-MOF. Recent studies have demonstrated that transforming bulk-type MOFs into MOFs nanosheets (NSs) can maximize the exposure of active sites and mass transfer. However, c-MOF NSs have rarely been applied in electrochemical sensing. Results This study presents NSs type c-MOF Cu 3 (benzenehexathiol) (CuBHT), synthesized using a simple sacrificial template method. CuBHT NSs were modified onto a glassy carbon electrode (GCE) to prepare CuBHT NSs/GCE, which was then applied to sense the model target ascorbic acid (AA), the system exhibits high sensitivity of 1.521 mA mM −1 cm −2 and a wide linear range of 1–789 μM, low detection limit of 0.46 μM. The sensitivity is 1.90 times higher than that of bulk-type CuBHT nanoparticles (NPs) modified GCE, which can be attributed to the CuBHT NSs having more exposed Cu sites on their surfaces. CuBHT NSs/GCE was then used to monitor AA levels in human sweat during daily activities or exercise, and the results indicated high reliability compared to the vitamin C ASA kit method. Significance The design of c-MOF CuBHT NSs/GCE lead to better performance in terms of sensitivity and low detection limit in AA sensing compared to bulk-type nanoparticles. The AA sensing mechanism based on CuBHT was investigated, and the sensing system was demonstrated by detecting AA in sweat. This work advances both the fundamental understanding and practical applications of c-MOF NSs in AA sensing.
研究领域:
分析化学
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材料科学
·
生物医学工程
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DOI
PubMed
高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Yan Zhang,Junzhe Wang,Liang Li,Honggang Zhang,Bei Li,Xiangxiang Zhang,Zeyan Wang,Yuanyuan Liu,Peng Wang,Hefeng Cheng,Ying Dai,Baibiao Huang,Zhaoke Zheng
The design of organic–inorganic heterojunctions can facilitate the separation of photoinduced charge carriers by modulating the electronic structure at the surface and interface states, showing promising applications in the field of photocatalytic CO2 cycloaddition. However, the details of the surface/interface effects between these two components are still poorly understood. Herein, Cu2O@Cu3(HHTP)2 (HHTP = 2, 3, 6, 7, 10, 11-hexahydroxytriphenylene) heterojunctions were synthesized, where Cu2O nanoparticles (NPs) featuring distinct crystal facets were utilized as substrates for the in situ growth of the copper-based metal–organic framework (Cu3(HHTP)2). Among them, t-Cu2O@Cu3(HHTP)2, centered on t-Cu2O with {111} and {100} facets, exhibits superior performance toward photocatalytic CO2 cycloaddition to chlorinated propylene carbonate, with a conversion efficiency of 372 mmol g–1 h–1 under light. Notably, single-particle spectroscopy reveals a more efficient photogenerated carrier transfer between t-Cu2O and Cu3(HHTP)2. The results confirm that crystalline facet dependence is a key factor in semiconductor photocatalysis and an important strategy for optimizing the reactivity of photocatalysts, which provides a way to improve the photocatalytic CO2 cycloaddition performance by modulating the interfacial states of organic–inorganic heterojunction structures.
研究领域:
材料科学
·
催化化学
·
物理化学
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DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Zhuojun Wei,Yangguang Li,Liguang Dou,Muhammad Ahmad,Hui Zhang
A series of bi-transition-metal hybrids Cu3–xNixAl-LDH/rGO (x = 2.5, 2.0, 1.5) were synthesized via a facile preadjusted pH citric-acid-assisted coprecipitation method. Systematic characterizations suggest that the hybrids show honeycomb-like nanosheets array morphology with ultrathin CuNiAl-LDH nanosheets (∼72.3 × 4.2 nm) staggered vertically grown on both sides of rGO substrate. The Cu3–xNixAl-LDH/rGO hybrids present a remarkably superior reduction performance for 4-nitrophenol (4-NP) than pure LDH samples. Particularly, Cu1Ni2Al-LDH/rGO shows the best activity with kapp = 3.4 × 10–2 s–1, ∼1.7-fold of Cu1Ni2Al-LDH. It is worth noting that the activity of this bitransition metals hybrid Cu1Ni2Al-LDH/rGO is 37% higher than our previously reported monotransition metal hybrid Cu1Mg2Al-LDH/rGO (kapp = 2.5× 10–2 s–1). These findings can be ascribed to (1) highly dispersed ultrasmall Cu2O nanoparticles (∼3.8 nm) instantaneously formed via in situ reduction of atomic-level dispersed Cu2+ ions in LDH layer lattices of the Cu3–xNixAl-LDH hybrids beneficial from clear isolation and stabilization effect of Ni–OH; (2) strong promotion of the doping of atomic-level dispersed Ni2+ ions in LDH and possible Cu2O–Ni–OH(CuNiAl-LDH)–rGO three-phase synergistic effect; and (3) enhanced adsorption capacity for reactants upon π–π stacking and the unique honeycomb-like nanosheet array morphology. The series of hybrids exhibit not only excellent reduction properties for varied aromatic nitro compounds but also good decolorization ability for anionic azo dyes. Further fixed bed experiments reveal that Cu1Ni2Al-LDH/rGO can efficiently decolorize the mixed solution of 4-NP and methyl orange at high flow rate (8 mL/min) with TOF of 1.68 × 10–3 s–1, suggesting great application potential of the as-obtained nanosheet array bi-transition-metal hybrids for water remediation.
研究领域:
材料科学
·
环境化学
·
催化
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DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 20
·18617-18625
·
IF 2.195
Meng Zuchao,Li Mao,Liu Xiang,Lei Zigang
A new hydrazine electrochemical sensor was fabricated based on in situ synthesis of Cu 3 (BTC) 2 /GO nanocomposite. Cu 3 (BTC) 2 /GO composite were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectrometry (FT-IR). Meanwhile, the electrochemical behaviors of hydrazine on the Cu 3 (BTC) 2 /GO/GCE were studied by cyclic voltammetry and linear sweep voltammetry. Under the optimized conditions, Cu 3 (BTC) 2 /GO/GCE had enhanced electrocatalytic activity toward hydrazine due to synergic catalytic effect between Cu 3 (BTC) 2 and GO. The electrochemical sensor exhibited a wider linear range (1.0 µM to 5000 µM) and a lower detection limit (0.5 μM) as well as good reproducibility and stability. The proposed sensor has also been used for the determination of hydrazine in tap water with satisfactory results.
研究领域:
分析化学
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材料科学
·
环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）