Water
·
2024
·Vol. 16
·期 14
·2026
·
IF 3
Yang Gu,Chengjun Qiu,Wei Qu,Wei Tao,Zizi Zhao,Huili Hao
Cadmium (Cd) and zinc (Zn) in seawater enter the human body through the food chain. Combined toxicity tests indicated that high concentrations of Cd(II) and low concentrations of Zn(II) had a synergistic effect on humans. Thus, there is an urgent need to prepare a sensor for rapid and simultaneous detection of Cd(II) and Zn(II) in seawater. Herein, a reduced graphene oxide/carboxylated multi-walled carbon nanotube (rGO/MWCNT-COOH)-modified glassy carbon electrode was prepared in the experiments using the dropping method. The synthesis of various materials achieved the purpose of expanding the surface area, and scanning electron microscopy was used to observe the structure of the composite membrane. Moreover, the large number of functional groups on the surface of the composite membrane can also increase the adsorption of ions. For the determination of trace cadmium (II) and zinc (II) in seawater, the method used was differential pulse voltammetry (DPV). The results show that the peak current, which was obtained in the range of 5–400 μg/L for Cd(II) and Zn(II), has a linear relationship with concentration, corresponding to the detection limits of 0.8 μg/L for Cd(II) and 0.98 μg/L for Zn(II). The modified electrode was used to determine the Cd(II) and Zn(II) content in the coastal seawater of the Maowei Sea, and the recovery rate was between 95.8 and 98.2% for Cd(II) and 96.7~99.4% for Zn(II), which provided a novel approach of detection to define trace Cd(II) and Zn(II) in seawater.
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 35
·e03319
·
IF 2
Simombela Mikunga,Chanez Maouche,Peter Phiri,Shuang Wang,Chao Cheng,Juan Yang
The development of cost-effective, high-performance oxygen reduction reaction (ORR) electrocatalysts is pivotal for advancing energy conversion technologies such as metal–air batteries and fuel cells. Herein, we report a facile and efficient strategy to synthesize Mn nanoparticles loaded on N-doped hierarchically porous carbon framework (Mn/N-C) through utilizing ZIF-8 as a carbon/nitrogen precursor and MnCl 2 ·4H 2 O as the Mn source. The synthesis integrates mechanical grinding with an NaCl-assisted pyrolysis process, where molten NaCl acts as a dynamic template and intercalation agent to prevent structural collapse during carbonization, thereby creating a 3D porous architecture with coexisting micro-, meso-, and macropores. Physicochemical characterization reveals that the Mn/N-C-2 sample exhibits a high specific surface area (1770 m 2 /g), abundant defects, and uniform dispersion of Mn nanoparticles within the N-doped carbon matrix. Electrochemical evaluations demonstrate that Mn/N-C-2 catalyst possesses a higher half-wave potential ( E 1/2 ) of 0.836 V and a larger limiting current density ( J L ) of 5.54 mA/cm 2 , surpassing other control samples and most reported Mn-based catalysts and comparable to that of commercial Pt/C. When integrated into Zn–air batteries (ZABs), Mn/N-C-2-based ZABs deliver an open-circuit voltage of 1.49 V and a peak power density of 150.51 mW/cm 2 , outperforming benchmark Pt/C-based counterparts. This work offers a cost-effective electrocatalyst for ORR and can be used instead of noble metals in ZABs. Graphical Mn/N-C electrocatalysts are fabricated by a NaCl-assisted pyrolysis strategy. The optimized Mn/N-C-2 catalyst exhibits a large specific surface area, hierarchically porous architecture and high content of active N, presenting an E 1/2 of 0.836 V for ORR. When integrated into ZABs, it delivers an open-circuit voltage of 1.49 V and a peak power density of 150.5 mW/cm 2 .
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 22
·5774-5782
·
IF 7.779
Yu Zhang,Ting Hu,Changwang Ke,Fengyan Han,Weiping Xiao,Xiaofei Yang
Rational regulation of the coordination environment of Ru active sites by employing layered transition metal hydroxides as the substrate could achieve high catalytic performance towards the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR). However, it is still challenging to clarify the interactions between the Ru catalysts and the layered transition metal hydroxides in different phases and also to unveil the mechanism responsible for the boosted performance. Herein, we report novel Ru nanocluster-decorated few-layer Co(OH)2 nanosheets, which are employed as a model to investigate the structure–property relationship between zero-dimensional (0D) noble metal catalysts and two-dimensional (2D) substrates toward electrochemical reactions. The obtained α-Co(OH)2-Ru catalyst exhibits a very low potential difference (ΔE) of 0.557 V between the half-wave potential towards the ORR and the potential at 10 mA cm−2 towards the OER, which is smaller than those of β-Co(OH)2-Ru (0.614 V), α-Co(OH)2 (0.774 V) and β-Co(OH)2 (0.897 V). Density functional theory (DFT) calculations further reveal that the reaction energy barrier of the rate-determining step of α-Co(OH)2-Ru is much smaller than those of β-Co(OH)2-Ru and Ru, implying that the strong electronic interactions between Ru nanoclusters and layered α-Co(OH)2 nanosheets contribute majorly to the enhanced catalytic performance. Furthermore, the optimized α-Co(OH)2-Ru nanohybrid is employed as the air electrode to assemble rechargeable Zn–air batteries, which possesses a power density of 187.8 mW cm−2 and a long-term durability of 400 cycles without obvious attenuation.
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Ruixue Li,Caixia Chen,Xiaoping Shen,Zhenyuan Ji,Shiping Zeng,Peng Song,Hu Zhou,Lirong Kong
Graphene films based flexible supercapacitors exhibit huge application foreground for wearable electronics, but up to now, their preparations are always time-consuming and intricate, and their electrochemical characteristics and mechanical flexibilities are still far from satisfactory. In this study, we report a very facile and sustainable Zn-assisted self-assembly method to synthesize Graphene/MWCNTs films, in which multi-walled carbon nanotubes (MWCNTs) with various dosages are uniformly embedded between graphene sheets. Results demonstrate that, when the mass ratio of MWCNTs to GO is 1:6, the resultant Graphene/MWCNTs-4 has an ultrahigh area specific capacitance of 269.3 mF cm −2 at 1 mA cm −2 , which is obviously higher than five other counterparts in present study as well as the graphene films in literatures. The Graphene/MWCNTs-4 based all-solid-state supercapacitor has a maximum energy density of 197.9 mWh m −2 at 4408.7 mW m −2 , and a superior power density of 45396.2 mW m −2 at 40.1 mWh m −2 . Additionally, great capacitive and mechanical stabilities with capacitance retentions of 76.2% over 50,000 cycles and 82% at bending angles from 0 to 120° are also exhibited. The remarkable properties endow Graphene/MWCNTs-4 with tremendous application potential in wearable energy storage.
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 16
·期 3
·384-396
·
IF 4.204
Liu Xiangyu,Pan Yanling,Zhang Peng,Wang Yilin,Xu Guohao,Su Zhaojie,Zhu Xuedong,Yang Fan
Alkylation of benzene to value-added, high octane number and low toxic toluene and xylenes provides a way to lower benzene content in gasoline pool, and is hence a method to promote fuel quality. On the other hand, CO 2 accumulation in the atmosphere causes global warming and requires effective route for its valorization. Utilization of CO 2 as a carbon source for benzene alkylation could achieve both goals. Herein, alkylation of benzene with CO 2 and H 2 was realized by a series of low-cost bifunctional catalysts containing zinc/titanium oxides (Zn/Ti oxides) and HZSM-5 molecular sieves in a fixed-bed reactor. By regulating and controlling oxygen vacancies of Zn/Ti oxides and the acidities of HZSM-5, benzene conversion and CO 2 conversion reached 28.7% and 29.9% respectively, along with a total selectivity of toluene and xylene higher than 90%. In this process, more than 25% CO 2 was effectively utilized and incorporated into the target products. Moreover, the mechanism of the reaction was analyzed and the course was simultaneously traced. CO 2 was transformed into methanol firstly, and then methanol reacted with benzene generating toluene and xylene. The innovation provides a new method for upgrading of fuels and upcycling the emissions of CO 2 , which is of great environmental and economic benefits.
✓ 已验证
DOI
高影响因子
Nano Research
·
2014
·Vol. 7
·期 11
·1581-1591
·
IF 6.963
Guo Weisheng,Yang Weitao,Wang Yu,Sun Xiaolian,Liu Zhongyun,Zhang Bingbo,Chang Jin,Chen Xiaoyuan
Inorganic nanoparticles have been introduced into biological systems as useful probes for in vitro diagnosis and in vivo imaging, due to their relatively small size and exceptional physical and chemical properties. A new kind of colortunable Gd-Zn-Cu-In-S/ZnS (GZCIS/ZnS) quantum dots (QDs) with stable crystal structure has been successfully synthesized and utilized for magnetic resonance (MR) and fluorescence dual modality imaging. This strategy allows successful fabrication of GZCIS/ZnS QDs by incorporating Gd into ZCIS/ZnS QDs to achieve great MR enhancement without compromising the fluorescence properties of the initial ZCIS/ZnS QDs. The as-prepared GZCIS/ZnS QDs show high T
1 MR contrast as well as “color-tunable” photoluminescence (PL) in the range of 550–725 nm by adjusting the Zn/Cu feeding ratio with high PL quantum yield (QY). The GZCIS/ZnS QDs were transferred into water via a bovine serum albumin (BSA) coating strategy. The resulting Cd-free GZCIS/ZnS QDs reveal negligible cytotoxicity on both HeLa and A549 cells. Both fluorescence and MR imaging studies were successfully performed in vitro and in vivo . The results demonstrated that GZCIS/ZnS QDs could be a dual-modal contrast agent to simultaneously produce strong MR contrast enhancement as well as fluorescence emission for in vivo imaging.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Wen-bo Liu,Guan-ning Cui,Hu Wang,Dong-mei Zhang,Rui-xue Wu,Ling Li,Xia Zhang,Yu-hua Fan
Adsorption is considered as one of the eco-friendly methods to effectively remove pollutants from water environment. 1 , namely ([Zn 3 (dpcp) 2 (1,4′-bmib) 2 ] n , dpcp = 3-(3,5-dicarboxylphenoxy)-5-carboxylpyridine and 1,4′-bmib = 1,4-bis(2-methylimidazol-1-yl) butane), was synthesized under simple solvothermal method and characterized by XRD , PXRD , TGA , FTIR, BET and Zeta potential . The influence of temperature and pH of the solution and the dye initial concentration on the adsorption process of 1 was investigated using Congo red (CR) as the adsorption object. Pseudo second-order kinetics and Langmuir isotherms more accurately described the adsorption process of 1 . The maximum adsorption capacity measured in the adsorption experiment was about 262.2 mg g -1 . Thermodynamic studies showed that the entire adsorption process was spontaneous. In addition, 1 released the CR dye by a simple organic solvent (ethanol solution of NaOH) and exhibited stable and high adsorption performance over 5 cycles. The subtle hydrogen bond between 1 and the dye promotes its selective adsorption of CR.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Qi Zou,Qichi Le,Xingrui Chen,Yonghui Jia,Chunyan Ban,Tong Wang,Henan Wang,Ruizhen Guo,Liang Ren,Andrej Atrens
This paper investigates the microstructure, corrosion, electrochemical behavior, and the discharge performance of Gallium (Ga) alloyed Mg-Al-Zn alloys using the gravimetric method, electrochemical measurements, and battery test. The average grain size of AZ80–2.5Ga (Mg-8Al-0.5Zn-2.5Ga alloy) is 36% smaller than that of AZ80 (Mg-8Al-0.5 Zn alloy). The number and size of the Mg 17 Al 12 phase particles are smaller and more homogeneously distributed. Ga reduces the self-corrosion rate, increases the electrochemical activity and the discharge performance. The grain refinement generates many grain boundaries on the surface and promotes discharge performance. The decrease of the self-corrosion rate is attributed to the suppression of the protective film that inhibits the anode consumption. The AZ80–2.5Ga anode has the optimal discharge capacity of 1437 mAh g − 1 and anode efficiency of 61% at 50 mA cm −2 , which are 25% and 29% higher than for the AZ80 anode.
✓ 已验证
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 2
·162
·
IF 4.146
Huayin Li,Yuan Tan,Xingkun Chen,Wenshao Yang,Chuanqi Huang,Jie Li,Yunjie Ding
Methyl methacrylate (MMA) is an important monomer in fine chemicals. The synthesis of MMA by one-step oxidative esterification from methacrolein with methanol over a heterogeneous catalyst with high activity, selectivity and stability is highly desirable. Herein, Zn-Al-hydrotalcites (HTs)-supported atomically precise Au25nanoclusters with different molar ratios of Zn2+/Al3+were prepared and used as the precursors for this reaction. They exhibited good performances in comparison with the gold catalysts prepared by the deposition precipitation method. The structural and electronic properties were evaluated by various characterization technologies, including X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) of CO adsorption, X-ray photoelectron spectroscopy (XPS), and CO2temperature-programmed desorption (TPD). The combined characterization results suggested that the adsorption property of gold and the basicity of the catalyst contributes to their high activities. Substrates extended experiments and stability tests implied the potential application of Zn-Al-mixed oxides supported gold catalysts, which paves a new way for supported gold catalyst in the one-step oxidation esterification reaction.Keywords:gold cluster;hydrotalcite;methacrolein;methyl methacrylate;oxidative esterification
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2017
·Vol. 69
·期 11
·1500-1511
·
IF 1.258
Zhang Da-Wei,Lin Feng,Li Bo-Chao,Liu Hong-Wei,Zhao Tian-Qi,Zhang Yu-Min,Gu Qiang
An efficient method was developed for synthesising isoxazoles. A series of novel bis-isoxazole ether compounds VI, VII and VIII were synthesised starting from different substituted aldehydes ( I ) via a 1,3-dispolar cycloaddition using Zn/Zn 2+ as a catalyst; these were characterised by FT-IR, HRMS, 1 H NMR and 13 C NMR spectroscopy. In addition, the antimicrobial properties of the synthesised products were investigated. The synthesised compounds exhibited significant antifungal activities in comparison with the standard drugs, fluconazole and itraconazole. It was found that Candida albicans was sensitive to 2-substituted phenyl bis-isoxazole ethers bearing pyridyl.
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 29
·12850-12856
·
IF 3.288
Shice Wei,Fan Zhang,Zhenying Chen,Junjie Ding,Bai Xue,Chenbao Lu
The development of non-noble, efficient, and durable catalysts to replace expensive Pt-based catalysts for boosting the oxygen reduction reaction (ORR) is always an imperative and challenging topic. Herein, a triazine-linked covalent framework was prepared by using a cobalt-centered porphyrin derivative via a facile ionothermal approach, which was readily converted to a series of porous carbons (termed Co/N-PCs) with high surface areas upon controlled thermal treatment. The cobalt atoms coordinated with nitrogen were uniformly dispersed within the resulting porous structures. Accordingly, such as-prepared Co/N-PCs exhibited high activity for the ORR with a positive onset potential of 0.91 V (vs. RHE) and half-wave potential of 0.83 V, as well as good methanol tolerance and long-time durability. When used as air cathodes for Zn–air batteries, high power density (158.9 mW cm−2) and specific capacity (797 mA h g−1) were achieved, outperforming commercial Pt/C.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2013
·Vol. 1
·期 10
·2014-2020
·
IF 0
Wei-Dong Xiang,Hai-Long Yang,Xiao-Juan Liang,Jia-Song Zhong,Jing Wang,Le Luo,Cui-Ping Xie
We report the direct synthesis of highly luminescent Cu–Zn–In–S (CZIS) quaternary nanocrystals (NCs) in the non-coordinating solvent 1-octadecene (ODE) using chloride salts of Cu, In, and Zn as metal precursors in the presence of oleic acid and dodecanethiol. The resulting CZIS NCs had a narrow size distribution with an average diameter of 2.5 nm. The photoluminescence spectra can be tuned from 400 nm–850 nm by varying the Cu : Zn precursor ratio, and a relatively high photoluminescence quantum yield (PL QY) of 46% was obtained without any post-processing. The PL decay times of the as-prepared CZIS NCs were tunable via controlling the Cu : Zn precursor ratio and reaction time. The photoluminescence mechanism of the CZIS nanocrystals was discussed using the PL decay curves. EDS analysis revealed that the resulting CZIS NCs were Cu-deficient, and the internal defect-related emission process could be strongly promoted by the large Cu deficiency which is associated with the improvement of PL QY.
✓ 已验证
DOI
危险品化学品经营许可证（带存储）