Journal of Materials Chemistry A
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2018
·Vol. 6
·期 42
·21110-21119
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IF 9.931
Qiaoqiao Mu,Wei Zhu,Gangbin Yan,Yuebin Lian,Yuanzhou Yao,Qin Li,Yuyu Tian,Peng Zhang,Zhao Deng,Yang Peng
The development of efficient and economical catalysts for photocatalytic reduction of CO2 into chemical feedstocks is highly desirable for addressing both the global energy crisis and carbon emission problem. Herein, a series of carbonized cobalt composites derived from bimetallic Zn/Co zeolitic imidazolate frameworks (C-BMZIFs) are synthesized and used as the co-catalysts for [Ru(bpy)3]2+ mediated photocatalytic CO2 reduction under visible light irradiation. Varying the Zn/Co ratio allows regulation of the size of Co active sites, which further differentiates their catalytic activity towards CO2 reduction and H2 evolution, resulting in tunable CO/H2 ratio in the produced syngas. Among all investigated configurations, the C-BMZIF with a Zn/Co ratio of 3 : 1 demonstrates the highest CO yield of 1.1 × 104 μmol g−1 h−1, owing to the optimal balance between the quantity of active sites and the activity of each individual site. Consequently, this work provides insight into the design of stable MOF-derived co-catalysts for efficient photo-reduction of CO2, and offers an alternative solution for photocatalytic syngas production with tunable CO/H2 ratio.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nano Today
·
2024
·
IF 13.2
Zhihao Lin,Guangyang Liu,Bin Sheng,Yiming Zhao,Dan Xu,Zhijian Wu,Jie Zhou,Meng Zhang,Ge Chen,Jing Wang,Jun Lv,Huan Lin,Donghui Xu
Nanoplastics, as a novel pollutant, are widely found in the environment and water, which also can be migrated to vegetables and fruits through irrigation water and the growing process, posing threat to the human health. In this study, post-modification strategy was implemented to synthesize a series of fine-tuning hierarchically porous ZIF-derived nanoframework (Zn-Co-Ni-ZIF, Zn-Co-TA-ZIF and ZIF67-Ni-ZIF) with various morphologies and structures to investigate the relationship between the polystyrene nanoplastics (PS-NPs) adsorption performance and structure property. The correlation degree between PS-NPs adsorption property and structure parameter followed the order of the intensity of Co2p > the intensity of M-N > the number of linker deficiencies > crystal defect > zeta potential. The gray models (GM) (1,1) between adsorption capacity and evaluation items were successfully established (C < 0.342; RSD < 18.108 %) but zeta potential. A highly linked association (R 2 = 0.9561) between the PV meso /PV micro and equilibrium constants k t 2 may be discovered. The combined findings from experimental analysis and Density Functional Theory calculations demonstrated that the adsorption capacity of adsorbents for PS-NPs was greatly enhanced by the introduction of additional defects and the reinforcement of adsorbent-adsorbate interactions, including electrostatic and coordination interactions. Among the selected materials, Zn-Co-ZIF and Zn-Co-Ni-(60 mg)-ZIF exhibited better resistance to acid, alkali, and salt. Moreover, the PS-NPs removal efficiency of Zn-Co-ZIF and Zn-Co-Ni(60 mg)-ZIF were > 83.55 % and > 87.80 %, respectively, in irrigation water, watermelon, strawberry, and carrot, meeting the environmental and food safety. Therefore, this work provides valuable insights into the modification of MOFs to improve the elimination of micropollutants in water, fruit, vegetable, as well as a comprehensive comprehension of the correlations between structure and performance.
研究领域:
环境科学
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材料科学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Tianyu Wu,Xianhua Huan,Xiaolong Jia,Gang Sui,Lingyun Wu,Qing Cai,Xiaoping Yang
Through in-situ synthesis and thermal annealing, ZIF-derived nanoarrays were introduced to the surface of carbon fibers. The resulting modified carbon fibers (CoNC@CF) with the hierarchical nanostructure showed excellent electromagnetic wave (EMW) absorption capabilities, and were applied to 3D printing technology with polylactic acid (PLA) as the matrix. The CoNC@CF-PLA composites exhibited favorable 3D printability in comprehensive analysis, permitting the nanocomposite to be formed into complex structure as model designed. With the conduction loss , interface and dipole polarization and magnetic loss provided by CoNC@CF, the nanocomposites containing 10 wt% CoNC@CF displayed superior electromagnetic wave absorption capability. The minimum reflection loss value reached −45.5 dB at 11.5 GHz with a thickness of 2.9 mm. The introduction of CoNC@CF enhanced the mechanical properties of 3D printing PLA parts. After 30 s of microwave processing, the tensile strength of 3D printing PLA nanocomposites can be further enhanced. The CoNC@CF simultaneously improved the microwave absorption and mechanical properties of 3D printing nanocomposites parts. Thus, it provided a new efficient approach for preparation of structure-designable nanocomposites with integration of desired mechanical and electromagnetic wave absorption properties through 3D printing technology.
研究领域:
材料科学
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电磁学
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制造工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 10
·4437-4445
·
IF 2.7
Ran Zhang,Shaohong Zhang,Junhao Lu,Ying Wu,Jinjin Zhao,Zhijuan Wang
Nanozymes have attracted much attention as a new type of artificial enzyme with great development potential in recent years. Here, a cubic Co and N co-doped porous carbon material (Co-HPNC@NC) was synthesized through the calcination of PDA-modified bimetallic Co–Zn ZIFs. Co-HPNC@NC exhibits exceptionally high oxidase-mimicking activity and effectively oxidizes the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue-colored oxidized TMB (oxTMB) without H2O2. However, the formation of oxTMB was inhibited by the addition of L-cysteine (L-Cys). Therefore, the blue color faded to colorless, causing a notable decrease in absorbance. Furthermore, Co-HPNC@NC showed good selectivity and anti-interference ability toward the detection of L-Cys. As a result, a sensitive and efficient colorimetric method has been developed to determine L-Cys with a low detection limit of 0.17 μM (3σ). It is believed that this colorimetric method for the detection of L-Cys based on Co-HPNC@NC will show potential applications in biosensors and medical diagnosis.
研究领域:
材料科学
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纳米技术
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分析化学
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生物传感
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医学诊断
✓ 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）