RSC Advances
·
2012
·Vol. 2
·期 8
·3309-3314
·
IF 0
Yanghe Fu,Dengrong Sun,Meng Qin,Renkun Huang,Zhaohui Li
Aerobic oxidation of cyclohexene over [Cu2(OH)(BTC)(H2O)]n·2nH2O (Cu-MOF, BTC = 1,3,5-benzenetricarboxylic acid) and [M2(DOBDC)(H2O)2]·8H2O (Co-and Ni-MOF, DOBDC = 2,5-dihydroxyterephthalic acid) in the absence of solvent under mild conditions was studied. It is observed that both Cu-MOF and Co-MOF can selectively oxidize cyclohexene to give 2-cyclohexen-1-ol and 2-cyclohexen-1-one as the main products, while Ni-MOF is totally inactive for cyclohexene oxidation. The mechanism of the catalytic oxidation of cyclohexene over Cu-MOF and Co-MOF has been proposed. These MOF-based catalysts are stable and recyclable under current reaction conditions. This study highlights the great potential of developing MOFs as highly stable, molecularly tunable, recyclable and reusable heterogeneous catalysts for alkenes oxidation.
研究领域:
无机化学
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催化化学
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材料化学
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绿色化学
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有机合成
✓ 已验证
DOI
MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Ting Xu,Jing Hu,Hanjiao Chen
Herein, a sensitive method for the determination of trace thallium (Tl) in water samples was established using photochemical vapor generation (PVG) for gaseous sample introduction into an inductively coupled plasma mass spectrometer (ICP-MS) for quantitation. Various transition metal ions were spiked and studied as enhancement reagents to assist the photochemical generation of volatile thallium species in the medium of formic acid . An impressive limit of detection (LOD) of 11 ng L −1 was obtained with 20% formic acid solution containing 5 mg L −1 of cobalt ions , 210 s for UV irradiation and 50 mL min −1 carrier gas flow rate . The accuracy and reliability of the present method was validated by analysis of a water certified reference material, BWB2198-2016, as well as two types of real water samples (tap water and bottled drinking water), with spike recoveries between 102% and 109% achieved.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2012
·
IF 3.898
Lili Zhao,Shuhua Zhu,Jie Zhou
A novel amperometric nitric oxide (NO) sensor was prepared by modifying an imprinted functional polymer P-l[Co II (salen)] (salen: bis(2-hydroxy-benzaldehyde)ethylenediimine) on the surface of a glassy carbon electrode (GCE) in the presence of multi-wall carbon nanotubes (MWCNTs) and chitosan (CS). Here P-l[Co II (salen)] functionalized as an artificial recognition receptor for NO instead of a traditional molecularly imprinted polymer in which the template molecule was usually adopted to generate specific binding sites for itself. The analytical performances of the NO sensor were evaluated by differential pulse voltammetry (DPV) and amperometric measurements ( i – t ). The experimental results indicate that the developed sensor exhibits an outstanding anti-interference ability and has linear relationship with NO concentration in the range of 7.2 × 10 −9 –9.0 × 10 −5 M with the detection limit of 2.99 × 10 −9 M (S/N = 3). Finally, the sensor was successfully applied to the detection of NO release from peach fruits.
研究领域:
电化学
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分析化学
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材料科学
·
生物传感器
✓ 已验证
产品关联
DOI
高影响因子
Inorganic and Nano-Metal Chemistry
·
2017
·
IF 0
Jiaxing Li,Meng Ni,Chaoyi Fan,Yan Li,Xiuqing Zhang
A new cobalt complex [Co3(SIP)2(4-PP)8(H2O)6]·4H2O·2(4-PP) (1) with 5-sulfoisophthalic acid sodium (NaH2SIP) and 4-phenyl pyridine (4-PP) as ligands has been synthesized in the mixed solvents of ethanol and water. It crystallized in monoclinic, space group P21/c, with a = 20.9642(9) Å, b = 15.6091(5) Å, c = 20.0126(8) Å, α = 90.00°, β = 115.493(6)°, γ = 90.00°, V = 5911.2(4) Å3, Z = 2, Dc = 1.346 g/cm−3, F(000) = 2494, the final GOOF = 1.038, Rint = 0.0258 and wR2 = 0.1793. The complex (1) was characterized by single-crystal X-ray diffraction, magnetic susceptibility and IR spectroscopy analyses. Single-crystal X-ray diffraction shows that complex (1) is trinuclear based on cobalt units. Magnetic susceptibility measurement indicates that complex (1) shows an antiferromagnetic coupling between the Co(II) ions.
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
Acta Biomaterialia
·
2023
·
IF 9.7
Qi Wu,Bin Chen,Xin Yu,Zhen Wang,Zhongyang Sun,Jiahua Duan,Hao Ding,Weiwei Wu,Nirong Bao,Jianning Zhao
Metal ions released during wear and corrosion of the artificial knee/hip joints are considered to contribute to aseptic implant failure. However, there are few convincing in vivo studies that demonstrate the effects of metal ions on bone and soft tissue. This study examined the in vivo effects of Co(II)/Cr(III) ions on mouse calvaria and the supra-calvaria soft tissue in an original mouse model. With the implantation of a helmet-like structure, we set up a subcutaneous cavity on the calvaria in which Co(II) Chloride or Cr(III) Chloride solutions were administered respectively. A layer of interface membrane formed on the calvaria along with the implantation of the helmet. The administered Cr(III) ions accumulated in the interface membranes while Co(II) disseminated into the circulation. Accumulated Cr(III) and related products induced local massive macrophage infiltration and skewed the bone metabolic balance . At last, we revealed that lymphocyte aggregates, which are the pathologic hallmark of human periprosthetic tissue, could be caused by either Co(II) or Cr(III) stimulation. These in vivo results may shed light on the effects and pathogenic mechanism of the Co(II)/Cr(III) ions released from the joint prosthesis. Statement of significance Macrophage infiltration and lymphocyte aggregates are hallmarks of human joint periprosthetic tissue. We chronically administered Co(II)/Cr(III) ions on mouse calvaria and reproduced these two histopathologic hallmarks on mouse tissue based on an implanted helmet-like structure. Our results reveal that Cr(III) ions are locally accumulated and are effective in inducing macrophage infiltration and they can be phagocytosed and stored. However, the lymphocytes aggregates could be induced by both Co(II), Cr(III) and other unspecific inflammatory stimuli.
研究领域:
骨科
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生物医学工程
·
病理学
✓ 已验证
DOI
PubMed
高影响因子
ACS Omega
·
2025
·
IF 4.3
Jianbing Lv,Jiachen Fan,Lei Zhang,Chen Liang,Zuru Chen,Boxuan Hu,Yujun Zou,Siyu Li
The issue of clogging in highway tunnel drainage systems primarily stems from the long-term accumulation of floc-like sediments formed by the chelation of natural organic matter with metal ions. This study employed an electric field-enhanced Co(II)-mediated peroxymonosulfate system (E/Co(II)/PMS) for the efficient treatment of humic acid. Compared with the E/Co(II), Co(II)/PMS, or E/PMS systems alone, the E/Co(II)/PMS system exhibited superior humic acid removal performance, with a degradation rate of 92.3% in 30 min, which significantly improved the oxidation efficiency. The study reveals the mechanism of Co(II) activation of PMS to generate sulfate radicals (SO4•–) and hydroxyl radicals (HO•), and maintains the reaction in a sustained and efficient manner by cathode-driven Co(III)/Co(II) cycling. The experimental results showed that pH = 7, 0.2 mM Co(II), and 17 mA/cm2 current density were the optimal parameter combinations, and the degradation was inhibited by the inorganic anion CO32–, PO43–, and Cl–, which increased with its concentration, with the strongest inhibitory effect being observed for Cl–. The present study not only provides an efficient technical solution to address the issue of organic clogging in tunnel drainage systems, but also provides a theoretical and applied basis for the electrochemical oxidative degradation of organic pollutants in complex water quality through the analysis of the mechanism and optimization of the parameters.
研究领域:
环境科学
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水处理技术
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电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Ping Zhang,Xinru Yang,Can Wang,Fuwei Sun,Haibo Liu,Tianhu Chen,Dong Chen,Ziyang Chu,Jin Zhang,Jian Huang,Fazhi Xie
The bimetallic synergistic effect plays a significant role in enhancing the efficiency of antibiotics degradation via hydrogen peroxide (H 2 O 2 ) activation. In this study, the degradation of sulfamethazine sodium (SMT) by H 2 O 2 was comprehensively explored in a system where Cu(II) and Co(II) ions synergistically activate H 2 O 2 in the presence of calcite. The Cu(II)/Co(II)/calcite/H 2 O 2 system using only 1.0 mg/L of Cu(II), exhibits excellent oxidation capacity, enabling complete removal of SMT within 1 h (0.085 min −1 ). This rate is 4.5 and 23.5 times higher than those observed in the Cu(II)/calcite/H 2 O 2 (0.019 min −1 ) and Co(II)/calcite/H 2 O 2 systems (0.0036 min −1 ), respectively. According to scavenger experiments, ESR captures test, and chemical probe experiments, it is determined that Cu(III) primarily contributes to SMT degradation, rather than hydroxyl radicals (·OH), singlet oxygen ( 1 O 2 ), and high valent cobalt-oxo species [e.g. Co(IV)]. The introduction of Co(II) promotes the formation of Cu(III) by accelerating the oxidation of Cu(II). Furthermore, the degradation pathways for SMT are elucidated through UPLC-ESI-MS/MS analysis, and variations in toxicity are rigorously assessed using the ECOSAR program. In summary, this study reveals the highly effective synergistic activation of H 2 O 2 by Cu(II) and Co(II) in the presence of calcite, offering new insights into the comprehensive utilization of calcite in environmental catalysis, particularly for addressing the pollution caused by coexisting heavy metals and antibiotics.
研究领域:
环境科学
·
化学工程
·
催化
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水污染控制
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高级氧化工艺
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Haili Yu,Faqin Dong,Bowen Li,Frank S. Riehle
Rapid, reliable, and highly selective detection of SO 2 and its derivatives has an especially important practical significance in terms of environmental monitoring and human health. In this study, we describe a novel Co 2+ triggered radical reaction pathway for visual colorimetric detection of SO 2 and SO 3 2− . The reaction between Co 2+ and SO 2 or SO 3 2− with the assistance of dissolved oxygen produces highly active sulfate radical, leading to the oxidation of o-phenylenediamine (OPD). The oxidation products containing 2,3-dinitro-phenazinemethane, OPD dimer, and OPD trimer show strong UV–vis absorption. Consequently, SO 2 and SO 3 2− are quantitatively determined using the Co 2+ -OPD colorimetric detection system. This colorimetric assay exhibits a 60–650 μM and 30–70 ppm linear ranges for detection of SO 3 2− and SO 2 , respectively. The corresponding limit of detection is calculated to be 4.07 μM and 1.26 ppm for SO 3 2− and SO 2 . What is more, a distinct color change can be found at a SO 3 2− concentration of 50 μM by the naked-eye observation. The specific radical detection guarantees that the present colorimetric assay has a good anti-interference ability over common inorganic ions and gases.
研究领域:
环境化学
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分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Zhangxiang Lin,Pei Yuan,Yuanyuan Yue,Zhengshuai Bai,Haibo Zhu,Tinghai Wang,Xiaojun Bao
Selective separation and recovery of Co(II)/Mn(II) from purified terephthalic acid (PTA) production wastewater is very important to reduce the Co(II)/Mn(II) catalysts consumption and control the pollutant discharge. This work employed zeolites NaA, NaX, and HZSM-5 with different pore sizes and Na(I) contents to selectively separate and recover Co(II)/Mn(II) from PTA wastewater and to understand the adsorption mechanism. It is found that only NaA can exclusively adsorb Co(II)/Mn(II) through ion-exchange without adsorbing any aromatic organic compound (AOC); oppositely, HZSM-5 shows the highest adsorption capacity for AOCs but almost no adsorption for Co(II)/Mn(II); and NaX exhibits moderate adsorption capacities for both Co(II)/Mn(II) and AOCs. Moreover, pH can significantly impact the adsorption of both Co(II)/Mn(II) and AOCs due to the competitive adsorption between H(I) and Co(II)/Mn(II) and the electrostatic repulsion between AOCs and zeolites. The adsorption kinetics, isotherms, and thermodynamics were also investigated to lay a good basis for process development. Importantly, bench-scale experiments for simulating the industrial operation were carried out, and the results show that the adsorption capacity of the NaA particles for Co(II)/Mn(II) from the industrial PTA wastewater is 9.1/8.6 mg/g, respectively, without adsorbing any AOC. Therefore, an efficient strategy to selectively separate and recover Co(II)/Mn(II) from PTA wastewater was successfully developed.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jiangbo Huo,Guoce Yu,Jianlong Wang
In this study, a novel adsorbent, polyvinyl alcohol/graphene oxide/MnO 2 composite was prepared, characterized and used for efficient removal of Co 2+ and Sr 2+ from aqueous solution. Polyvinyl alcohol (PVA) and Mn 2+ played a synergistic role in the gelation of PVA/GO/Mn 2+ , while Mn 2+ can be further converted into oxide to achieve functionalized aerogel (PVA/GO/MnO 2 ). The spectroscopy analysis manifested that hydrogen bonds and electrostatic attraction were responsible for the formation of PVA/GO/MnO 2 . The functionalization of MnO 2 enhanced the adsorption capacity for Co 2+ (2.1 folds) and Sr 2+ (1.3 folds) by PVA/GO/MnO 2 . The composite showed high adsorption capacity at broad pH range of 4.0–9.0. For competitive adsorption test, Ni 2+ /Zn 2+ exerted the most interfering effect on Co 2+ adsorption, while Mg 2+ /Ca 2+ showed severe interfering effect on Sr 2+ adsorption. Both electrostatic attraction and oxygen-containing groups contributed to the adsorption mechanism. This study may provide a new adsorbent for separation of Co 2+ and Sr 2+ from aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Qing Sun,Yingjie Zhao,Jian Zhang,Jiawei Sheng
Developing efficient photocatalysts based on the peroxymonosulfate (PMS) activation for effective degradation of threatening antibiotic contamination under visible light is still a challenging subject. Herein, a Co-doped Bi 2 MoO 6 (CBMO) spherical crystals were synthesized via a facile hydrothermal method and used to degrade artificial antibiotic wastewater via PMS activation under visible light. The obtained 3 wt % Co-doped B 2 MoO 6 (3CBMO) can effectively remove 98.95% of norfloxacin (NOF) within 40 min, 100% of tetracycline (TC) and metronidazole (MNZ) within 30 min. Compared with the contrasting catalysts, the superior catalytic activity of 3CBMO was attributed to the synergistic effect of photocatalytic and Co(II) activated PMS degradations. Quenching tests in combination with EPR measurements revealed that the hole (h + ), sulfate (SO 4 − •) and hydroxyl (•OH) were the primary radicals all contributed to NOF degradation. The influences of initial concentration, catalyst dosage, PMS dosage and various interfering ions (NO 3 − , Cl − , SO 4 2− , and HCO 3 − ) on the degradation efficiency of NOF were systematically examined. Furthermore, possible degradation pathways of NOF were proposed by LC-MS. This novel 3CBMO catalyst might be a promising candidate for degradation of the main sources of antibiotic contamination in pharmaceutical wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2022
·
IF 11.211
Xiumin Zhang,Yongping Dong,Qingyi Wang,Hang Yu,Congjie Gao,Lixin Xue
Structures and NF performance of TFC-Co and TFC membranes activated with 50 % alcohol solutions were studied. Methanol and glycol solution activation increased water flux 2–4 times without trading off salt rejection while glycerin solution activation increased water flux 3–4 times with reduced salt rejection and increased dye/salt retention selectivity . The Stokes radius of TFC-Co membrane changed from 0.77 nm to 0.66, 0.78 and 0.92 nm while the TFC membrane changed from 0.54 nm to 0.55, 0.65 and 0.70 nm after activation with methanol, glycol and glycerin solutions, respectively. Capillary pore filling models were developed from pure alcohol absorption experiments including the stages of initial pore filling, pore expansion, pore relaxation and pore adjustment, while most Stokes radius after 50 % solutions activation were found to be close to the relaxed pore radius values (r rx ) or half of the expanded pore radius values (r ex ) from pure alcohol absorption experiments.
研究领域:
材料科学
·
环境工程
✓ 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）