MICROCHIMICA ACTA
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2015
·Vol. 182
·期 9
·1733-1738
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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.
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ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Xiaosheng Zhang,Hong Xu,Zhijun Zuo,Zhi Lin,Stanislav Ferdov,Jinxiang Dong
Copper zirconium phosphate hydrate (Cu(OH)2Zr(HPO4)2·2H2O, hereafter referred to as Cu-α-ZrP) with high crystallinity was directly synthesized in a NaF-CuO-ZrO-P2O5-H2O system under hydrothermal conditions. The copper ion was confirmed to be an exchangeable cation in the Cu-α-ZrP through elemental analysis and a proton ion exchange process. The crystal structure of the Cu-α-ZrP was determined ab initio by using X-ray powder diffraction data. In the structure, the CuO6 octahedron would be located in an exchangeable atom position. Moreover, Cu-α-ZrP was evaluated as an additive in grease in a four ball test. The maximum nonseizure load (PB, representing the load-carrying capacity) of the base grease containing Cu-α-ZrP was increased from 353 to 1235 N. The excellent load-carrying capacity may be explained by the easier adherence of the material to the worn surface forming a tight protective film.
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PubMed
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Analytical Methods
·
2016
·Vol. 9
·期 2
·338-344
·
IF 1.915
Huijuan Wang,Jianhang Qu,Yong Wang,Shufang Li,Jianying Qu
Here, gold/Ni(OH)2 nanocomposites supported on reduced graphene oxide (Au/Ni(OH)2/rGO) were synthesized by a one-step wet-chemical method, which were characterized by TEM, IR, SEM, XPS and XRD techniques. The experiments demonstrated that the as-prepared nanocomposites showed a collection of unique characteristics, for example, high loading and homogeneous distribution. The nanocomposite modified electrode was prepared based on a glassy carbon substrate, which possessed excellent electrocatalytic activity to the redox reaction of catechol (CC). Under optimal conditions, the concentration of CC showed a linear relationship with its response current from 0.4 μM to 33.8 μM with a detection limit (S/N = 3) of 0.13 μM. The proposed sensor was successfully applied to detect CC in water with satisfactory results, which exhibited excellent selectivity and sensitivity, with potential applications.
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JOURNAL OF MOLECULAR STRUCTURE
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2024
·
IF 4
Qi An,Lixin Liu,Yujiao Li,Jingwen Shi,Yunan Zhang,Yingli Liu,Haiting Zhang,Yuning Wang,Xuan Zhang
In the present work, the effect of the number of hydroxyl groups in the hydroxybenzoic acid on the cocrystallization of enrofloxacin , including the conformation of enrofloxacin in the crystals, packing and physicochemical properties, has been investigated in an attempt to explore the possible general relationship between the number of coformers hydroxyl groups and the changes in the properties of the active pharmaceutical molecule. With this purpose, two new enrofloxacin pharmaceutical salt crystals, enrofloxacin 3-hydroxybenzoic acid hydrate (ENR-3HBA-HYD) and enrofloxacin 3, 5 dihydroxybenzoic acid hydrate (ENR-3, 5HBA-HYD) have been synthesised and their crystal structures have been determined by infrared spectroscopy, differential scanning calorimetry, powder X-ray diffraction, and single-crystal X-ray diffraction. The conformational differences between the enrofloxacin molecules in the two hydrated salts were found to be very small and both have the same packing mode. Interestingly, the presence of one water molecule in the ENR-3HBA-HYD lattice stabilizes chain formation. Whereas the ENR-3, 5HBA-HYD lattice contains two water molecules that act as bridges between chains to build a 2D layered structure. The hydrogen bonding interactions of the two salts were further investigated with frontier molecular orbitals and molecular surface electrostatic potential. Additionally, Solubility and hygroscopicity experiments showed that ENR-3HBA-HYD has higher solubility and, conversely, ENR-3, 5HBA-HYD is more advantageous in anti-hygroscopicity. These differences in properties can be well explained by thermal analysis, Hirshfeld surface and energy framework analysis.
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Advanced Science
·
2024
·
IF 14.3
Yanghai Gui,Jintao Wu,Di Zhao,Kuan Tian,Shuaishuai Zhao,Huishi Guo,Xiaoyun Qin,Xiaomei Qin,Dongjie Guo,Yun Wang
H 2 S gas sensors with facile preparation, low detection limits, and high selectivity are crucial for environmental and human health monitoring. However, it is difficult to maintain a high response of H 2 S gas sensors under high humidity in practical applications. To face this dilemma, a layer-by-layer growth method is applied to in situ prepare a nanostructured Co(CO 3 ) 0.5 (OH)·0.11H 2 O/WO 3 coated by a hydrophobic hierarchical ZIF-67 as the H 2 S sensor. This novel composite exhibits excellent humidity immunity without sacrificing the excellent sensitivity and selectivity of H 2 S. At a low operating temperature of 90 °C, a remarkable response value of 1052.3 to 100 ppm H 2 S has been achieved, which is 779 and 9.36 times higher than that of pure WO 3 and Co(CO 3 ) 0.5 (OH)·0.11H 2 O/WO 3 , respectively. More importantly, an 82.2% relative response value remains at a high humidity of 75%RH. The sensing mechanisms are investigated using gas chromatography-mass spectrometry (GC-MS), which revealed that the reaction products are H 2 O and SO 2 . The high humidity immunity and fast response of the Co(CO 3 ) 0.5 (OH)·0.11H 2 O@ZIF-67/WO 3 demonstrate the layer-by-layer in situ synthesis method holds the potential application for the development of high-performance WO 3 -based H 2 S sensors.
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Nanoscale
·
2025
·
IF 5.1
Weiji Dai,Bing Wu,Fan Zhang,Yuxi Huang,Cuijiao Zhao,Yudong Zhang,Can Cui,Jing Guo,Saifang Huang
Due to the ease of synthesis and large specific surface area, Ni(OH)2 nanosheets have emerged as promising electrochemical sensing materials, attracting significant attentions in recent years. Herein, a series of oxy-hydroxides based on Ni(OH)2 nanosheets, including NiOx/Ni(OH)2@NF and (MNi)Ox/Ni(OH)2@NF (M = Co, Fe, or Cr), are successfully synthesized via the electrochemical oxidation and incorporation strategies. Electrochemical tests demonstrate that these Ni(OH)2-based oxy-hydroxides exhibit excellent electrochemical oxidation activity for glucose in alkaline electrolyte. Among these, (CoNi)Ox/Ni(OH)2@NF displays higher sensitivity of 3590.3 μA mM-1 cm-2 across a broad linear range of 10 μM to 1.14 mM, with a rapid current response time of less than 4 s. The superior sensing performances of (CoNi)Ox/Ni(OH)2@NF are attributed to the formation of abundant Ni3+ species and reactive-O atoms due to the electrochemical oxidation, and the synergistic effects of Co/Ni active sites resulted from the electrochemical incorporation process. In addition, the (CoNi)Ox/Ni(OH)2@NF demonstrates good stability and reproducibility for glucose sensing. This work fully leverages the significance of surface reconstruction of Ni(OH)2, providing new insights for the application of transition metal-based oxy-hydroxides materials in bio-sensing.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Xue Chen,Chunyan Hu,Feng Hong,Yanfen Fang,Xi Yuan,Hailin Tian,Yingping Huang
Hydrodynamic cavitation (HC) is a promising technology for the removal of organic pollutants because the collapse of cavitation bubbles can generate reactive oxygen species (ROS) from the water molecular. However, the controlled reactive oxygen species (ROS) in the HC process remains a challenge. This study has regulated the dominant radical species in HC-activated persulfate (PDS) systems by adjusting experimental conditions, such as PDS dosage and pH. Atrazine (ATZ) degradation of 95 % was achieved after 180 min in HC-activated PDS of 0.37 mM at pH = 6.8. The mineralization rate of ATZ was 44.9 % due to the synergistic effect of sulfate radical ( SO 4 − ) and hydroxyl radical ( OH). The main degradation pathways of ATZ were dealkylation products and ring-opening products. Increasing the PDS dosage to 3.7 mM, the degradation of ATZ was 94.0 % after 60 min with the dominant radical of SO 4 − , while the mineralization rate of ATZ was only 8.8 %. Correspondingly, when OH was the dominant radical in HC-activated PDS at pH = 3.5, the removal rate and mineralization rate of ATZ reached 97.5 % and 77.4 %, respectively. It is demonstrated that the contribution of ROS was difference in HC-activated PDS systems for the ATZ degradation and mineralization. The controlled strategy of ROS in HC-activated PDS systems offers a promising approach for effectively eliminating various organic pollutants in the wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhenglin Chen,Jiaqi Yang,Zhicheng Du,Jiansong Ji,Likun Zhang,Haifei Guan,Zhengyang Lei,Xiaopeng Zhang,Canhui Yang,Ying Zhu,Qianhui Sun,Lulu Xu,Ke Lin,Yuchen Wang,Chuhui Wang,Chong Zhang,Dongmei Yu,Peiwu Qin,Can Yang Zhang
In the realm of flexible wearable electronics and interactive technologies, the adhesive and touch-sensing properties of materials play a crucial role, especially soft ionic conductors. However, these materials face several challenges in practical application, including structural damage, loss of functionality, and device stratification, particularly in extreme environments. To address this, a novel multifunctional organic hydrogel, termed PC-OH, was designed and prepared to enhance its performance. The hydrogel exhibits self-adhesion, self-healing, anti-freezing, anti-drying, and conductive capabilities. It demonstrates outstanding self-adhesive properties on skin surfaces under air (approximately 967 J/m2) or underwater (approximately 428 J/m 2 ) conditions, with high transparency (visible light transmittance of 87 %), anti-freezing capability (−60 °C), anti-drying capability (60 °C), rapid self-healing in air or water (within 4 s), long-term stability over a wide temperature range (−20 °C to 60 °C for up to 7 days), high extensibility (up to ∼1700 % at 60 °C and ∼1200 % at −20 °C), and conductivity over a broad temperature range (ionic conductivity of 1.93 S m −1 at 60 °C and 3.13 × 10 -3 S m −1 at −30 °C). Based on these properties of PC-OH hydrogel, we constructed a capacitive touch system to demonstrate its practical application. The touch panel features high stretchability, transparency, anti-freezing, anti-dehydration, self-healing, and self-adhesive human–machine interface capabilities, enabling integration with the skin under abnormal temperature and humidity conditions. Tasks such as writing text, drawing graphics, and playing electronic games validated the significant potential of the hydrogel in touch panels, providing a solution to long-standing issues of adhesion and tactile sensing.
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Inorganic Chemistry Frontiers
·
2017
·Vol. 5
·期 1
·172-182
·
IF 4.036
Bingrong Wang,Yang Cao,Yong Chen,Ruzhi Wang,Xiaohong Wang,Xiaoyong Lai,Chunhui Xiao,Jinchun Tu,Shujiang Ding
NiCo2O4 nanoflowers were synthesized through a microwave-assisted hydrothermal method and used as a type support for Ni(OH)2 nanoparticles. In the three-dimensional NiCo2O4 nanoflowers, two-dimensional ultrathin nanosheets supported the Ni(OH)2 nanoparticles by homogeneous precipitation. The materials were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The electrochemical oxidation of methanol was probed through the NiCo2O4/Ni(OH)2 modification on a glassy carbon electrode in an alkaline medium by employing cyclic voltammetry (CV) and chronoamperometry (CA). The current density of the NiCo2O4/Ni(OH)2 electrode in 1 M KOH with 0.5 M methanol ascends to 92.3 A g−1 and restores to 94.6% of the primitive value through the replacement with a new solution after a long-term CV cycling (500 cycles). Therefore, the compounds further corroborate their excellent electrocatalytic activity and superb perennial stability for methanol oxidation. This study demonstrates that NiCo2O4/Ni(OH)2 is a peculiar material with an outstanding performance in direct methanol fuel cells.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Shi Yong-juan,Pei Jia,Zhang Jian,Niu Jia-lin,Zhang Hua,Guo Sheng-rong,Li Zhong-hua,Yuan Guang-yin
A strategy of suppressing the fast degradation behaviour of Mg-based biomaterials by the introduction of one of Mg degradation products Mg(OH) 2 was proposed according to the following degradation mechanism, Mg + 2H 2 O ⇋ Mg(OH) 2 + H 2 ↑. Specifically, Mg(OH) 2 submicron particles were mixed into poly (L-lactic acid) (PLLA) to synthesize a composite coating onto hydrofluoric acid-pretreated Mg-Nd-Zn-Zr alloy. The in vitro degradation investigations showed that the addition of Mg(OH) 2 particles not only slowed down the corrosion of Mg matrix, but also retarded the formation of gas pockets underneath the polymer coating. Correspondingly, cytocompatibility results exhibited significant improvement of proliferation of endothelial cells, and further insights was gained into the mechanisms how the introduction of Mg(OH) 2 particles into PLLA coating affected the magnesium alloy degradation and cytocompatibility. The present study provided a promising surface modification strategy to tailor the degradation behaviour of Mg-based biomaterials.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Hongwei Wang,Xianliang Ren,Fang Wu,Gaobin Liu,Shufang Zhang,Haijun Luo,Zhiqin Zheng,Liang Fang
MXenes have demonstrated exceptional potential in the adsorption of uranium (U(VI)) from wastewater. However, significant challenges remain in the investigation of its adsorption capacity and mechanism. To enhance the adsorption capacity of Ti 2 CT x , this study conducted alkalization experiments on Ti 2 CT x and subsequently prepared Ti 2 C(OH) 0.13 @SA aerogel spheres by combining alkalized Ti 2 C(OH) 0.13 with sodium alginate (SA). The results indicated that alkalization effectively increased the proportion of OH functional groups. After alkalization treatment, Ti 2 C(OH) 0.13 exhibits a significantly enhanced adsorption capacity, reaching up to 951 mg g −1 , which represents more than a twofold increase compared with untreated Ti 2 CT x . The adsorption follows pseudo-second-order kinetics and the Langmuir isotherm model, suggesting chemical and monolayer adsorption, respectively. Thermodynamic studies reveal an endothermic adsorption process. DFT calculations demonstrate that the OH functional group forms chemical bonds with U(VI), promoting reductive adsorption. Aside from electrostatic adsorption, XPS analysis confirms Ti(II) oxidation and U(VI) reduction. This study further investigates the adsorption capacity of Ti 2 C(OH) 0.13 @SA aerogel spheres in simulated seawater environments. It is found that even at an ultra-low concentration of U(VI) as low as 3.3 μg/L, these aerogel spheres still exhibit significant adsorption performance, with an adsorption capacity reaching up to 3.21 mg g −1 , highlighting their substantial potential for applications.
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Sustainable Materials and Technologies
·
2025
·
IF 9.2
Dan Xu,Yuwei Hua,Yanyan Huang,Yiming Zhao,Xin Chen,Jingyuan Zhang,Ge Chen,Guangyang Liu,Zhijian Wu,Xiaomin Xu,Donghui Xu
The rapid industrialization and extensive use of synthetic dyes have led to significant environmental pollution, particularly through dye wastewater, which poses severe ecological risks. Conventional single treatment methods often struggle to effectively remove complex and stable dye molecules. In this study, we developed COF-based chitosan hydrogel microspheres by combining COF-LZU1 and Co(OH)₂ via co-precipitation and self-assembly techniques. The synergistic effect between COF and Co(OH)₂ enabled simultaneous adsorption and degradation of neutral red, significantly enhancing the adsorption capacity. Under optimal conditions (15 mg of composite material, 20 min reaction time, pH = 7), the composite exhibited an adsorption capacity of 1325.48 mg/g and a degradation efficiency of 100 %, surpassing the performance of most conventional adsorbents. Furthermore, the incorporation of Co(OH)₂ into COF enhanced the stability of the composite material, as indicated by thermodynamic analysis and adsorption performance across different component ratios. Adsorption process modeling revealed that the adsorption kinetics fit well with the Elovich model, while isothermal adsorption followed the Langmuir model. Among common interfering substances, CH₃COO − was found to enhance the catalytic process, whereas humic acid inhibited it. Quenching experiments and EPR analysis confirmed that superoxide anion radicals (•O₂ − ) and singlet oxygen ( 1 O₂) were the primary active species in the catalytic process, with hydroxyl radicals (•OH) playing a relatively minor role. This study highlights the synergistic interaction of COF and Co(OH)₂ in improving adsorption performance, stability, and catalytic efficiency, providing a novel strategy for the preparation of advanced composite materials and new insights into pollutant removal mechanisms.
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