SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Chengyuan Duan,Meili Ding,Yi Feng,Mengjue Cao,Jianfeng Yao
Integration of Lewis acid and base sites and oxygen surface groups in one catalyst is favorable to promote CO 2 cycloaddition reaction. Here, Zn-ZIF-L was used as starting material to design one kind of catalyst with multiple active sites via pyrolysis and oxidization treatment. The well-dispersed ZnO nanoparticles and pyridinic nitrogen in nitrogen-doped carbon serve as Lewis acid and base sites to activate epoxide and CO 2 while oxygen surface groups help promote the ring-opening reaction of epoxides. Results show that Zn-ZIF-L derived catalyst displays high catalytic activities for CO 2 cycloaddition (6 h, 83% of yield) under mild conditions (70 °C and 0.1 MPa CO 2 ) and outperforms ZIF-8 derived catalyst. Moreover, the obtained catalyst also achieves a satisfactory photothermal catalysis of cycloaddition reaction under light irradiation (120 mW/cm 2 ), which makes our sample a promising catalyst for CO 2 conversion.
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CHEMICAL ENGINEERING SCIENCE
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2021
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IF 4.311
Cunyin Zhang,Leibin Guo,Chengwei Deng,Haili Huang,Yuanhui Cheng
Aqueous zinc-based flow battery has advantages of low cost, high safety and abundant reservoir, showing a good application prospect. However, zinc dendrites remain a big issue to their cycling stability. Herein, we construct a multi-structured semi-solid anode by packaging multi-layered graphite felt and zinc slurry based on microporous carbon wrapped nano-ZnO ( [email protected] ). [email protected] is prepared by polymerizing dopamine on nano-ZnO and followed calcination . Microporous carbon shells act as restriction spaces, forbidding either oxidized or reduced zinc species flow out, but also serve as the first electron network. Meanwhile, carbon black and graphite felt function as the second and third electron networks. Besides, trace alkaline solutions deliver hydroxyl ions. Thus, the redox of zinc species proceeds in microporous carbon shells without zinc dendrites. Resultantly, semi-solid anode has high electrochemical activity and stability in zinc-iron flow batteries. The average efficiency is 74.8％ with negligible fluctuations over 840 h (460 cycles).
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 13
·1-12
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IF 2.8
Liu Guoqiang,Xiong Xiaoyan,He Yuan,Gong Yunpeng,Li Siyi,Jin Tao,Chen Yufang
Triethylamine (TEA) sensors are an effective and powerful tool for real-time monitoring of TEA, and play an important role in early warning of production processes, environmental atmospheric monitoring and human health protection. In this paper, SnO 2 /ZnO complex oxide was prepared by calcining bimetallic organic frameworks (BMOFs) to improve both the selectivity, sensitivity and accuracy of TEA-sensing materials and devices. The results show that the obtained 5Sn5Zn complex oxide prepared by mol (Sn):mol (Zn) = 1:1 has excellent selective responsiveness, repeatability and longtime reliability stability to TEA gas at 270 °C Besides, the 5Sn5Zn complex oxide exhibits a rapid response/recovery performance to TEA at 100 ppm concentration ( T res / T rec = 4 s/60 s separately), especially at the high humidity of 40–90% relative humidity (RH), and the response degree of the 5Sn5Zn complex oxide to TEA only decreases by 17%. This may be the best TEA selective response stability achieved by SnO 2 /ZnO complex oxide material under high humidity conditions.
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Nanomaterials
·
2021
·Vol. 11
·期 11
·3098
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IF 5.076
Boyu Zhang,Sixiang Zhao,Yingying Yu,Ming Li,Liancheng Zhao,Liming Gao
Circularly polarized light (CPL) detection and polarization state recognition are required for a wide range of applications. Conventional polarization detection with optical components causes difficulties for miniaturization and integration. An effective design strategy is proposed for direct CPL detection with chiral material. Here, we realized direct CPL detection based on the combination of chiral photonic cellulose nanocrystal (CNC) and ultraviolet-sensitive ZnO photoconductive material. The CNC layer deposited by evaporation-induced self-assembly established the left-handed chiral nematic structure with a photonic bandgap (PBG) to recognize left-handed CPL (LCPL) and right-handed CPL (RCPL) at specific wavelengths. The PBG of CNC layer has been modulated by the adjustment of chiral nematic pitch to match the semiconductor bandgap of ZnO film in ultraviolet region. The photocurrents under RCPL and LCPL are 2.23 × 10−6A and 1.77 × 10−6A respectively and the anisotropy factor Δgpcof 0.23 is acquired for the CPL detection based on the chiral photonic CNC. This design provides a new approach to the detection of CPL polarization state with competitive performance.Keywords:circularly polarization light detection;cellulose nanocrystal;ZnO photoconduction
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高影响因子
CHEMOSPHERE
·
2021
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IF 7.086
Linfeng Zhang,Xianghui Wu,Jianding Li
To deal with the environmental pollution and energy crises, it is indispensable to find green and efficient means to overcome these challenges. Herein, the Sn-doped BiOI modified multi-shelled ZnO heterojunction composite with a high performance are designed and prepared. The results prove the formation of heterojunction structure in the composites and the morphology is shown as the multi-shelled microsphere. The performances of the composites are evaluated by different kinds of antibiotic degradation and H 2 -evolution under simulation sunlight irradiation. The measurements present that the Sn -BiOI/ZnO (SBZs) could completely remove ciprofloxacin (CIP) within 100 min, which is 4.18 times that of ZnO in kinetics. Typically, the degradation rate of CIP for SBZ6 is over 99.9%, which is more than 25% higher than that of pure ZnO microspheres. In addition, the rate of H 2 production could reach 3.08 mmol g −1 ∙ h −1 , which is 1.79 times of the pure ZnO microspheres. The boosted performance of the composites may originate from the enhanced electronic transmission efficiency and improved separation and recombination efficiency of electrons/holes. The charge transfer mode in the SBZs heterojunction composites is proposed and verified as the Z-scheme by the active species experimental and the possible electron transfer path analysis. Therefore, Sn -doped BiOI is introduced into multi-shelled ZnO microsphere to form contact heterojunction interfacial, which greatly improves the photocatalytic performances of the SBZs. Furthermore, this work supplies a strategy for designing and preparing highly active ZnO-based heterojunction composites, which could effectively address the challenges of environmental remediation and clean energy production.
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CURRENT APPLIED PHYSICS
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2021
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IF 2.48
Weiyuan Gu,Hongyan Zhang,Chu Chen,Jun Zhang
ZnO/PANI composite humidity sensor was prepared by hydrothermal method . The first principles of density functional theory study the sensing mechanism. The calculation shows that the oxygen vacancy on ZnO surface is beneficial to the adsorption of water molecules. The {0 0 0‾1} crystal plane with the largest lattice oxygen number in ZnO has a strong adsorption capacity for water molecules, which is also conducive to improving the humidity sensitivity. PANI is easy to be combined on {0 1‾1 0} plane of ZnO, and it indirectly promotes the growth of {0 0 0‾1} plane, increasing the adsorption of water molecules and the proportion of H + and H 3 O + ions. In addition, the N–H group in ZnO/PANI enhances the H + conduction, which further improves the performance of the sensor. The results concluded that the proportion of lattice oxygen in humidity sensor is an important factor of humidity sensor sensitive detection.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Yubin Li,Yi He,Jia Zhuang,Heng Shi
Materials with superwettability have attracted much research interest over the last few decades in the field of water-oil separation. Distinct from other superwetting materials, dual superlyophobic materials that have superoleophobicity in water and superhydrophobicity in oil can perform on-demand oil/water separation without requiring extra energy. However, obtaining such a dual superlyophobic membrane with multifunctionality for application in a complicated wastewater environment remains a challenge. Taking advantage of both ZnO and polydopamine , a multifunctional PDA/SC/KFs@ZnO freestanding membrane was prepared in our study. This novel material displays dual superlyophobicity and has potential application for rapid and simultaneous separation of light and heavy oil-water mixtures, oil-in-water emulsions with soluble dye, and water-in-oil emulsions, as well as a good adsorption-catalysis performance for removing soluble dyes in water under visible light . Our work presents a facial and economic method that uses natural kapok fibers to fabricate a special multifunctional superwetting membrane that is promising for future applications.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Tao Li,Yuhua Li,Xike Zhang,Jiawei Yuan,Junkang Guo,Pan Wang,Gehong Wei,Chun Chen
The widespread application of metal-based nanoparticle (MNPs)/reduced graphene oxide (rGO) composites inevitably leads to their release into soils. However, we lack a detailed understanding of the bacterial community response to MNPs-rGO exposure in farmland soils. Here, we conducted a soil microcosm experiment to analyze the potential impact of MNPs-rGO on bacterial communities in two field soils via high-throughput sequencing. The change in alpha diversity of bacterial communities was more susceptible to Ag-rGO and ZnO-rGO treatments than CuO-rGO. In both soils, MNPs-rGO significantly changed the bacterial community structure even at a low dose (1 mg kg −1 ). The bacterial community structure was most strongly affected by Ag-rGO at 30 days, but the greatest changes occurred in ZnO-rGO at 60 days. The differences in soil properties could shape bacterial communities to MNPs-rGO exposure. Distance-based redundancy analysis and functional annotation of prokaryotic taxa showed that some bacterial species associated with nitrogen cycling were greatly influenced by Ag-rGO and ZnO-rGO exposure. In sum, Ag-rGO and ZnO-rGO may potentially affect bacterial communities and nitrogen turnover under long-term realistic field exposure. These findings present a perspective on the response of bacterial communities to MNPs-rGO and provide a fundamental basis for estimating the ecological behavior of MNPs-rGO.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2023
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IF 5.7
Jiawei Jiang,Yaru Wei,Junren Chen,Jianan Dai,Jing Ma,Liangsheng Qiang,Juanqin Xue,Weiwei Liu
Background Environmental pollution demands the fabrication of suitable nano-photocatalyst that works under visible-light irradiation. The effective interfacial engineering is required for better separation of charges. Semiconductor heterostructure promotes the practical separation of electron-hole pairs and enhances the carrier separation efficiency, which has broad application prospects in photocatalytic degradation of Antibiotics. However, it remains a significant challenge to construct high-quality directly heterostructure effectively. Methods In this work, a hierarchical ternary heterojunction (Li-C 3 N 4 /ZnO/BiOI) was facilely synthesized by employing an in-situ hydrothermal strategy with different ratios using Li-C 3 N 4 as an anchor, in which the interaction at heterointerfaces was enhanced to improve the photocatalytic performance. Significant findings The photocatalytic degradation experiment was carried out with Tetracycline (TC), and the effect of the molar ratio of Li-C 3 N 4 /ZnO to BiOI on the photocatalytic degradation performance was quantitatively investigated. Benefiting from the unique electronic structure of heterostructure, the results show that a degradation rate of 92.62% was achieved for 10 mg/L TC solution within 20 min. Moreover, Li-C 3 N 4 /ZnO/BiOI-5 offered high photocatalytic activity due to the type II and Z transport, resulting in a small forbidden band gap. The charge transport pathway improves the separation of photogenerated electron-hole pairs in Li-C 3 N 4 /ZnO/BiOI. This study provides a promising avenue for rational design and application of ternary composites.
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CATALYSIS COMMUNICATIONS
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2020
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IF 3.612
Haohua Jin,Jiasheng Wang,Wan-Hui Wang,Yang Li,Ming Bao
The utilization of CO 2 is nowadays important for alleviating energy and environmental crisis. Herein, amino-functionalization was used to improve the performance of SiO 2 -supported Ni-ZnO nanocatalyst for the hydrogenation of sodium bicarbonate to formic acid . The activity, stability and retainability were all improved upon the introduction of amino group. A formic acid yield of 30.4% was obtained from sodium bicarbonate when passing 5 vol% H 2 /N 2 at 70 °C for 4.5 h, which is considered among the best catalytic performances reported under ambient pressure. The simultaneous improvement of the three aspects through a simple operation is attractive in the field of catalysis.
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Journal of the Iranian Chemical Society
·
2023
·Vol. 20
·期 5
·1145-1154
·
IF 2.4
Liu Jun,Lan Lixin,Liu Xuanyan,Zhou Quan,Li Rong
In this paper, Cu x OAu–ZnO nano-catalysts with different morphologies were synthesized by one-step replacement method. The nano-catalysts are characterized by scanning electron microscopy, energy-dispersive X-ray analysis, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. These novel Cu x OAu–ZnO nano-catalysts exhibit exceptionally high stability and superior 4-nitrophenol to 4-aminophenol hydrogenation ability. The relationship between catalytic performances and changes of composition were investigated, and the catalytic activity decreased in the following order: Cu x O 30 Au 35 –ZnO > Cu x O 38 Au 35 –ZnO > Cu x O 21 Au 45 –ZnO. The influence of catalytic conditions for the performance of catalysts has also studied. For the Cu x O 30 Au 35 –ZnO catalysts, the rate constant k app could be up to 18.6 × 10 −3 s −1 , and the conversion of the 4-NP could still reach 98.66% after five cycles. The high activity of Cu x O 30 Au 35 –ZnO may be attributed to the synergistic effect between Au and Cu element. The unique structure and high catalytic performance make Cu x OAu–ZnO nano-catalysts for practical applications in 4-nitrophenol reduction.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Chun Zhang,Jing Zhou,Min Nie,Qi Wang,Fang Yang,Rui Han
Basalt fiber (BF) as a promising reinforcing material, is used widely to prepare polymer composite , but poor interfacial interaction with polymer matrix deteriorates the reinforcement effect. Here, a biomimetic “root-like” BF with laterally-grown zinc oxide (ZnO) nanowires was prepared via dopamine surface modification and two-step hydrothermal method . By virtue of the coordination of catechol groups with Zn 2+ ions, the polydopamine coating layer provided the strong affinity with the ZnO seeds layer and facilitated the direction growth of ZnO nanowires, with firm immobilization on the BF surface. Accordingly, the robust interlocking interface was successfully constructed in the root-like BF/polymer composite by penetrating laterally-grown ZnO nanowires into polymer matrix, greatly reinforcing the interfacial adhesion. Compared to conventional surface chemical treatment only suitable for a single specific system, the interfacial interlocking effect mainly depended on the formation of the laterally-grown ZnO nanowires, rather than intrinsic properties of polymer components, so as to be applied to a wide range of polymer composites. This can be exemplified by 265% and 197% increases in interfacial strength of the root-like BF-filled polypropylene (PP) and polydimethylsiloxane (PDMS) composite over that of the corresponding pristine BF ones.
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