SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Gaocan Qi,Kaiyue Guo,Jie Yang,Yuhang Wang,Ziyu Wang,Zhihao Yuan
The practical application of filter membranes for oil–water separation requires high efficient, large flux and excellent stability. Hydrogel membrane with superhydrophilicity and underwater superoleophobicity has been considered as an ideal material for efficient separation of oil–water mixture. However, hydrogel materials are generally fragile and easy to dehydrate. In this work, inorganic CuO oriented-rods framework was used to support water-adsorbent polyacrylic acid (PAA) resin for constructing superhydrophilic-superoleophobic composite hydrogel membrane. The as-prepared composite membrane displayed stable underwater superoleophobicity during swelling-drying cycles and abrasion test. In “bottom-injection” filter apparatus, the CuO@PAA membrane exhibited high separation efficiencies, above 99.90%, for kerosene-water, hexadecane-water, soybean oil–water and rapeseed oil–water mixtures with water penetration fluxes larger than 5700 L•m −2 •h −1 . The excellent separation efficiency and flux were capable of maintaining for 200 separation processes. This work paved the way for designing and constructing economical and practical oil–water separation equipment for industrial application.
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CHEMOSPHERE
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2022
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IF 8.943
Yue Lu,Xingxin Hu,Lin Tang,Bo Peng,Jin Tang,Taotao Zeng,XunkuoZhang,Qian Liu
The development of sustainable, low-cost and responsive technology for heavy metals detection in wastewater is crucial. In this study, by combining CuO/ZnO photocathode with microbial anode, a novel photo-microbial fuel cell (PMFC) sensor was developed. The self-powered PMFC was performed under light and dark condition for heavy metals detection. Compared with MFC sensor, PMFC sensor showed a wider detection range (0.1–4 mg L −1 of Cd 2+ and 10–80 mg L −1 of Cu 2+ ). The improved performance in sensing limit and sensitivity was mainly attributed to the intimate P–N heterojunctions formed in CuO/ZnO, which accelerated the electron transport between the photocathode and the microbial anode. Besides, the toxicity of five heavy metals tested in PMFC was shown as Cd 2+ >Cr 6+ >Zn 2+ >Hg 2+ >Cu 2+ . This study has taken advantage of the characteristics of PMFC and facilitated its application in heavy metals detection, which provides a new approach for the development of biosensors .
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Journal of Nanomaterials
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2022
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IF 3.791
Yuping Fu,Peng Deng,Xiaoxia Li
In this study, the effect of copper oxide (CuO) with different sizes on the heat-induced catalysis decomposition of typical molecular perovskite-based energetic material DAP-4 was studied. Pure CuO with different sizes and DAP-4 are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Heat-induced catalysis decomposition performances of DAP-4 with adding CuO were investigated by differential scanning calorimeter (DSC). Results demonstrated that with a lower-addition CuO at the nanoscale added (1 wt%), DAP-4 had decreased at least by 36°C with the heating rate of 10°C/min, compared with pure DAP-4. With the CuO particle size of 50 nm, the of DAP-4 heat-induced decomposition in DAP-4/CuO-50 had reduced from 159.8 kJ/mol to 120.2 kJ/mol, which is lower than DAP-4/CuO-150. The heat-induced catalysis decomposition mechanism of DAP-4 by using CuO as a nanoadditive was proposed.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Wenjie Li,Lifen Li,Qineng Xia,Song Hong,Lijun Wang,Zhibo Yao,Tai-Sing Wu,Yun-Liang Soo,Hao Zhang,Tsz Woon Benedict Lo,Alex W. Robertson,Qingya Liu,Leiduan Hao,Zhenyu Sun
Electrochemical CO 2 reduction (ECR) to commodity chemicals offers a promising way for mitigating the greenhouse effect and driving the transition from fossil-fuel dependence to a sustainable economy. To this end, the design and development of active and robust electrocatalysts is key. Here we report for the first time that incorporation of bismuth (Bi) single atoms on defective CuO could significantly enhance the ECR reaction to C 2 H 4 by decreasing C–C coupling barriers. The overpotential for C 2 H 4 production is lowered by at least 50 mV, along with a two-fold improvement in the faradaic efficiency, reaching 60% at 400 mA cm −2 . The high performance is maintained even after 20 h of consecutive electrolysis. Control experiments along with density functional theory calculations suggest that the joint incorporation of Bi and oxygen vacancies greatly promotes CO 2 adsorption and lowers C–C coupling energy barriers, thereby improving the C 2 H 4 selectivity.
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CARBON
·
2022
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IF 11.307
Jianqiao Liu,Kai Yan,Jingdong Zhang
As an advanced oxidation technology, photoelectrocatalysis (PEC) has been widely explored to degrade refractory contaminants in the environment. Meanwhile, enzymatic biodegradation provides an effective approach to removal of organic pollutants under mild conditions. Herein, we developed a biophotoelectrocatalytic system to remove bisphenol A (BPA) based on the combination of PEC and enzymatic biodegradation. We utilized carbon fiber cloth (CFC) as substrate to construct a dual-photoelectrode biophotoelectrocatalytic system based on three dimensional (3D) nanostructured TiO 2 photoanode with oxygen vacancy defects (Ov-TiO 2 /CFC) and enzyme-coupled CuO/g-C 3 N 4 /CFC photocathode. The excellent PEC performance of Ov-TiO 2 /CFC photoanode significantly promoted the formation of reactive radicals for the degradation reaction, ascribed to efficient separation and migration of photogenerated carriers. The proposed system displayed good synergistic effect between PEC and enzymatic catalysis for BPA removal, with more than 99% degradation efficiency after 90-min treatment. This work demonstrates CFC as a useful substrate material for constructing highly efficient biophotoelectrocatalytic degradation system for organic pollutant removal.
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Nano Materials Science
·
2021
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IF 0
Tianqi Liang,Jie Liu,Zhaoyang Wei,Dean Shi
In this study, CuO nanoparticles are pre-modified with styrene-maleic anhydride copolymers (SMAs) of different molecular weights and MAH contents. Then the pre-modified CuO nanoparticles (CuO-SMAs) are added to the PA6/SEBS (Styrene Ethylene Butylene Styrene copolymer) (40/60 wt/wt) polymer blends with a co-continuous morphology. When SMA3 (MAH = 8 wt%, M n = 250000 g/mol) is used to modify CuO nanoparticles, and the grafting degree of SMA3 on the surface of CuO reaches 2.74 wt%, 90.71% of the added mCuO-SMA3 nanoparticles can be located at the interface of PA6 and SEBS. A porous PA6 membrane with CuO nanoparticles located at the pore walls can be obtained after the SEBS phase is etched with xylene. The catalytic reaction velocity constant (k) for the reduction of p-nitrophenol in NaBH 4 solutions with the PA6/mCuO-SMA3 porous membrane can reach 1.0040 min -1 . This work provides a feasible and straightforward method for the preparation of porous polymer membranes with functional nanoparticles located at the wall of the pores.
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CERAMICS INTERNATIONAL
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2020
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IF 3.83
Yuli Zhou,Jian Wang,Xinkang Li
Flexible chemiresistor-type sensor based on chemically sensitive oxide semiconductors is of great potential for wearable sensing field. It is still challenging in designing sensing materials with high electron mobility for the enhancement of sensitivity and developing flexible chemical sensors with high durability for commercial applications. Herein, we introduce that poly (para-phenylene terephthalamide) fibers, which are currently employed as substrate to support the composite NiO@CuO metal oxide semiconductors. The poly (para-phenylene terephthalamide)-NiO@CuO gas sensor exhibits excellent thermostability, with rarely changing in mass observed up to 450 °C of high temperature testing. Furthermore, a relatively low limit of detection of 46.5 ppb for NH 3 is achieved at room temperature. The gas sensing mechanism of the sensing materials is interpreted via the electron-mobility-dominating gas sensing mode, in which the hole density is directly influenced via the electrons transferring between gas molecules and sensing materials. These results of the chemical gas sensor provide great promising for developing sensing materials with highly sensitivity and unlock the potential for newly-designed flexible chemiresistor-type sensor in the field of wearable sensing applications.
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RSC Advances
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2020
·Vol. 10
·期 5
·2767-2785
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IF 3.119
Songfa Qiu,Hongjun Zhou,Zhichuan Shen,Li Hao,Huayao Chen,Xinhua Zhou
Silanized iminodiacetic acid (GLYMO–IDA) modified mesoporous silica (G-SBA) was prepared following a co-condensation method. G-SBA/Cu2+, G–SBA/Zn2+ and G-SBA/Cu2+–Zn2+ were obtained through the impregnation method with coordination by GLYMO–IDA. SBA/CuO, SBA/ZnO, and SBA/CuZnO were generated after calcination of G-SBA/Cu2+, G-SBA/Zn2+ and G-SBA/Cu2+–Zn2+. After modification, the amount of metal ion was 6 to 70 times higher than that of the blank mesoporous silica. The diameter of nano-copper oxide particles in mesoporous silica was 4.8 nm. The bacteriostatic rates of SBA/CuO at a copper oxide concentration of 250 ppm against E. coli and S. aureus were 85.87% and 100%, respectively. SBA/CuO and SBA/CuZnO with {111} lattice planes exhibited better antibacterial effects compared to the commercial-grade nano-zinc oxide and nano-copper oxide. When exposed to ultraviolet light, SBA/CuZnO displayed the highest photocatalytic activity and optimal antimicrobial effect. Therefore, SBA/CuZnO can be an alternative to antibiotics because of its non-toxic nature and good antibacterial properties.
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ChemistrySelect
·
2023
·Vol. 8
·期 28
·e202301088
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IF 2.1
Hui Zhou,Xiaoliang Sun,Wenming Guo,Tingting Bao,Yi Zhang,Chenxu Guo,Hanning Xiao,Hang Qin,Pengzhao Gao
Graphical [+] These authors contributed equally to this articleDurable CuO/ZnO/CeO 2 /ZrO 2 catalyst on SiC support for methanol steam reforming was prepared by the combination of inverse microemulsion method and precipitation method. The methanol conversion of the catalyst was still reached 98.8 % after 150 h, considerably higher than that of solution combustion method (70 %), without carbon deposition and pronounced sintering after the reaction. Durable CuO/ZnO/CeO 2 /ZrO 2 catalyst on SiC support for methanol steam reforming (MSR) was prepared by the combination of inverse microemulsion method and precipitation method which is termed as inverse microemulsion/precipitation method. The presence of Ce−O−Zr solid solution facilitated the production of oxygen vacancies and Ce 3+ species in the prepared CuO/ZnO/CeO 2 /ZrO 2 catalyst. Owing to the unique tiny reaction pool and the addition of precipitant for inverse microemulsion/precipitation method, the particle size of the prepared catalyst was principally between 2 and 6 nm, with an average size of 3.66 nm. Besides, the small particle size and the highly dispersed of Cu species boosted the reduction performance of the catalyst, enabling the reduction temperature to be only 201 °C. The methanol conversion of the reduced catalyst was still reached 98.8 % after 150 h, considerably higher than that of solution combustion method (70 %), without carbon deposition and pronounced sintering after MSR reaction.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
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IF 14.229
Songxue Wang,Jiayu Tian,Qiao Wang,Feng Xiao,Shanshan Gao,Wenxin Shi,Fuyi Cui
A CuO coated ceramic hollow fiber membrane with dual functionalities of membrane filtration and peroxymonosulfate (PMS) activation was successfully constructed by applying phase-inversion and dip-coating technologies. The CuO coating condition was investigated, and the optimized CuO coated ceramic hollow fiber membranes (CuO@CHFMs) exhibited excellent catalytic activity for PMS activation to depredate bisphenol A (BPA) in the presence of humic acid (HA), chloride ions (Cl − ) and bicarbonate (HCO 3 − ). Based on the scavenger experiments and electron paramagnetic resonance (EPR) analyses, the non-radical reactive oxygen species - singlet oxygen ( 1 O 2 ), rather than sulfate radicals (SO 4 •- ) or hydroxyl radicals ( • OH), was elucidated as the primary reactive species responsible for the oxidation of BPA in the system. The redox circles of Cu(II)/Cu(I) on the CuO surface of the CuO@CHFMs are mainly responsible for PMS activation and a possible degradation pathway of BPA was proposed. Moreover, the CuO@CHFMs exhibited excellent stability and reusability without tedious catalyst separation/recovery processes. This study is meaningful for the development of novel catalytic membrane with PMS activation functionality in water treatment.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 37
·16475-16480
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IF 2.7
Xiaoxu Zhang,Xiangyu Cai,Yanqun Fei,Yuying Jia,Hongyan Shan,Yanfu Huan
In this article, a CRET-based chemiluminescent sensor was developed for ascorbic acid detection. Au/Pt@Cu2O/CuO NPs with peroxidase activity were prepared to catalyse the decomposition of H2O2 to produce free radicals, which led to the enhancement of the chemiluminescence (CL) signal, and the CRET between luminol and MnO2 NSs was able to take place and the CL signal was reduced; the presence of ascorbic acid would reduce MnO2 NSs, which was able to weaken the energy transfer between luminol and MnO2 NSs and restored the CL signal. Under the optimal experimental conditions, the detection range of ascorbic acid was 1–1000 μM, and the LOD was 0.35 μM. The method is sensitive and has a wide linear range, and is expected to be applied to the detection of ascorbic acid in more complex environments.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Jialin Liang,Fang Yuan,Ting Liu,Chenguang Qian,Zhangshuo Song,Lijuan Wei,Chunquan Li,Zhiming Sun
Photothermal catalytic oxidation is a promising and sustainable method for the degradation of indoor formaldehyde (HCHO). However, the excessively high surface temperature of existing photothermal catalysts during catalysis hinders the effective adsorption and degradation of formaldehyde under static conditions. Catalyst loading and oxygen vacancies (OVs) modulation are commonly employed strategies to reduce the photothermal catalytic temperature and enhance the efficiency of photothermal catalytic oxidation. In this work, a p-n type CuO/TiO 2 heterojunction is successfully loaded onto diatomite using a wet precipitation method. Under the irradiation of a 300W xenon lamp, the prepared composite material achieved a 100% removal rate of HCHO within 2 h, with a 98% conversion rate to CO 2 , surpassing the performance of both individual photocatalysts and thermocatalysts. Additionally, by adjusting conditions such as light irradiation and temperature, we have demonstrated that this material exhibits synergistic photothermal catalytic properties. Based on HRTEM, XPS, Raman, and EPR analyses, the introduction of diatomite as a catalyst support was shown to effectively increase the number of OVs. Experimental results, along with O 2 -TPD, photoelectrochemical characterization, and radical detection, demonstrate that the presence of OVs enhances the oxidative efficiency of both photocatalysis and thermocatalysis, as well as the UV–Vis-IR photothermal catalytic performance. The ternary composite material generates weak hydroxyl ( • OH) and superoxide ( • O 2 − ) radical under high-temperature with dark conditions, indicating its catalytic oxidation activity under this condition. The increase in temperature and the expansion of the spectral range both enhance the generation of these radicals. In summary, this work demonstrates that the use of diatomite as a support increases the material's specific surface area and OVs content, thereby enhancing adsorption and photothermal catalysis. It elucidates the enhanced catalytic degradation mechanism of this mineral-based photothermal catalyst.
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