JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Xiaoqiang Cui,Jianwei Zhang,Minghui Pan,Qiang Lin,Muhammad Bilal Khan,Xiaoe Yang,Zhenli He,Beibei Yan,Guanyi Chen
Pyrolysis is a promising technique to achieve the sustainable utilization of heavy metal hyperaccumulator derived from phytoremediation of contaminated soils. To investigate the feasibility of synergistic treatment of hyperaccumulator and plastic waste (i.e. polyvinyl chloride , PVC), co-pyrolysis of Sedum alfredii and different mass percentages of PVC (5–25 wt%) was conducted at 300–900 °C in the present study. High pyrolysis temperature and low PVC addition amount (5 wt%) effectively promoted the volatilization of Cd and Zn from S. alfredii , while high PVC addition amount (15 wt% and 25 wt%) caused a significant suppression effect at insufficient pyrolysis temperatures. After PVC addition, the yields of biochar increased by 5.18–37.19% as compared with the theoretical values. However, the concentrations of Cd and Zn leached from biochar significantly elevated with increasing PVC addition amount, indicating that the addition of PVC improved the mobility of Cd and Zn in biochar. Moreover, S. alfredii derived biochars showed considerable sorption capacity for Cd (87.6–198.3 mg/g). These results imply that the addition of PVC has double-edged effects on heavy metal separation and biochar production during pyrolysis of Cd/Zn hyperaccumulator, and low PVC addition amount and sufficient pyrolysis temperature are beneficial for the further utilization of biochar.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Guohao Xu,Xuedong Zhu
A core-shell structured Zn/SiO 2 @ZSM-5 catalyst was prepared by a hydrothermal coating method, and its physicochemical properties and catalytic performance in methane co-aromatization with propane were studied using a conventional solid catalyst (Zn/ZSM-5) as the comparison. Results revealed that methane was activated on Zn sites to form a large number of Zn methyl species and then incorporated during the aromatic formation process to promote the formation of aromatics. At a space velocity of 3600 mL g −1 h −1 and the reaction temperature of 550 ℃, the methane, propane conversion and the aromatics selectivity of Zn/SiO 2 @ZSM-5 catalyst were 7.9 %, 95.9 % and 88.1 %, respectively, which were higher than those of Zn/ZSM-5 catalyst by 2.8 %, 6.7 % and 6.8 %, respectively. The unique reaction pathway of core (Zn/SiO 2 , Zn sites)-shell (ZSM-5, acid sites) was mainly responsible for the superior performance in methane co-aromatization with propane. Meanwhile, the core-shell structured Zn/SiO 2 @ZSM-5 catalyst aroused the formation of distinct micro-macroporous system, which facilitated quick diffusion of desired products out of the intraframework channels and inhibited the formation of carbon deposits. These features of Zn/SiO 2 @ZSM-5 catalyst granted it superb diffusion ability and unique core-shell structure, which greatly enhanced the methane, propane conversion and aromatic selectivity together with a preeminent catalytic stability.
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Nanotechnology Reviews
·
2021
·Vol. 10
·期 1
·870-882
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IF 7.848
Qiuyang Zhang,Li Zhang,Minhui Yang,Qingxiang Hong,Zhongmei Yang,Sen Liu,Qingping Xiong,Changjiang Pan
As biodegradable orthopedic implant materials, magnesium alloys have been attracted enough attentions recently. However, too fast degradation in vivo , limited biocompatibilities, and insufficient antibacterial properties are three main challenges at present. In order to solve these problems, a multifunctional composite coating of Chi(Zn/BMP2)/HA was constructed on AZ31B magnesium alloy surface, successively by the alkali heating treatment, self-assembly of 16-phosphonyl-hexadecanoic acid, in situ immobilization of Chi(Zn/BMP2) (chitosan, zinc ions, and bone morphogenetic protein 2), and the deposition of HA (hydroxyapatite). The results of ATR-FTIR (attenuated total reflection Fourier transform infrared spectrum) spectra and elemental compositions confirmed that 16-phosphonyl-hexadecanoic acid, Chi(Zn/BMP2), and HA were successfully immobilized on the surface. Compared with Mg, Mg-OH, Mg-16, and Mg-Chi(Zn/BMP2), Mg-Chi(Zn/BMP2)/HA with the concave–convex structure surface significantly enhanced the hydrophilicity and corrosion resistance. On the other hand, Mg-Chi(Zn/BMP2)/HA coating also showed excellent biocompatibilities, which not only significantly promoted the osteoblast adhesion and proliferation, but also upregulated ALP and OCN expression of osteoblasts. Furthermore, due to the synergistic antibacterial effect of zinc ions and chitosan, Mg-Chi(Zn/BMP2)/HA showed a good antibacterial property against Escherichia coli ( E. coli ). Therefore, it can be said that the method used in this work has a good application prospect in improving the corrosion resistance, biocompatibility of magnesium alloys, and inhibiting infections against E. coli .
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Journal of Materials Chemistry A
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2021
·Vol. 9
·期 30
·16565-16574
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IF 12.732
Hanfang Zhang,Zhensheng Chen,Yihe Zhang,Zequn Ma,Yingge Zhang,Liqi Bai,Li Sun
Zinc-ion hybrid capacitors (ZHC) are promising new types of energy storage devices that combine many advantages of supercapacitors and batteries. However, the bottlenecks of low energy density and inferior cyclic stability urgently need to be addressed, and constructing advanced cathode materials is a feasible and effective strategy to overcome this barrier. Herein, we report a ZHC with enhanced performance obtained by incorporating N and P heteroatoms into cross-linked porous carbon nanosheets (CNPK) for promoting the Zn-ion adsorption. The ex situ XPS results during the charging and discharging processes proved the existence of –OH and Zn2+ chemical adsorption. Theoretical simulations revealed that the doping of N and P atoms can weaken the energy barrier of the reaction between the cathode and Zn2+; graphitic nitrogen and graphitic phosphorus are particularly significant for the reduction of the reaction energy barrier. Consequently, CNPK exhibited a high capacitance of 233 F g−1 at 0.5 A g−1 and low equivalent series resistance. The assembled aqueous ZHC demonstrated a capacity of 103.2 mA h g−1 (232.2 F g−1) at 0.1 A g−1, energy density of 81.1 W h kg−1, power density of 13.366 kW kg−1, and an excellent cyclic stability of 101.8% capacitance retention after 10 000 cycles in ZnSO4 electrolyte. A quasi-solid-state ZHC was assembled to verify the practical application, which delivered a high capacity of 141.0 mA h g−1 at 0.1 A g−1 and a remarkable energy density of 89.3 W h kg−1. This work opens the door to the study of porous carbon materials for high-performance ZHCs.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Qiang Cao,Long-Long Zhang,Chang Zhou,Jing-Hui He,Antonio Marcomini,Jian-Mei Lu
Transformation of CO 2 into value-added chemicals with efficient and recyclable catalyst is an effective way to reduce carbon emissions. It is valuable to develop an efficient catalyst that can promote the N-formylation reaction under mild conditions with a high activity and excellent recyclability. Single atom catalysts (SACs) possess ultimate atom utilization efficiency and outstanding catalytic performance. Herein, we synthesize Zn SACs (Zn-TpPa) anchored on a COF (TpPa-1) using a facile solution method. Catalyzed by Zn-TpPa, CO 2 and N-methylamine are transformed into N-methylformanilide under mild reaction conditions with a TOF of 17,155 h −1 , which is the highest among all reported recyclable Zn-based catalysts. Zn-TpPa can also catalyze N-formylation of many other amines with excellent yields. The higher reactivity was attributable to the well-dispersed Zn active sites on COF and outstanding adsorption of CO 2 owing to high surface area of COF. Our research provides a facile method for constructing SACs as well as an effective pathway for CO 2 transformation and environmental protection.
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MICROCHEMICAL JOURNAL
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2021
·
IF 4.821
Hui Li,Jie Zhao,Shifan Zhao,Guofeng Cui
Developing a reliable, sensitive and portable electrochemical sensor for precise determination of trace heavy metal ions in water is an attractive challenge. In this work, an integrated three-electrode sensor based on screen–printed gold working electrode (SPAuE) ex-situ electroplated bismuth film was developed via a facile and simple process for the determination of trace Pb(II), Cd(II), and Zn(II) by square wave anodic stripping voltammetry (SWASV). The bismuth film was deposited on SPAuE at a potential of −0.08 V (Bi/SPAuE −0.08V ). The results exhibited the sensor with a wide linear range (from 1 to 120 μg L -1 ) for the simultaneous detection of these three heavy metal ions. Besides, the detection limits of Pb(II), Cd(II), and Zn(II) for the sensor were respectively found to be 0.04 μg L −1 , 0.02 μg L −1 , and 0.05 μg L −1 (S/N = 3). The proposed sensor revealed good anti-interference ability, satisfactory repeatability with RSDs of less than 2.5% (n = 12), excellent reproducibility with RSDs of less than 2.5% (n = 6), and considerable stability. The detection accuracy of the Bi/SPAuE −0.08V based sensor was further evaluated via atomic absorption spectroscopy (AAS). Due to its simplicity in process, high detection performance and excellent reliability, such sensors are expected to find utility in portable heavy metal detection applications.
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ACS Nano
·
2021
·
IF 15.881
Ying Liu,Ziwen Dai,Wang Zhang,Yue Jiang,Jian Peng,Dianlun Wu,Bin Chen,Wei Wei,Xian Chen,Zhenjie Liu,Zhigang Wang,Fei Han,Dahu Ding,Lei Wang,Lina Li,Yingguo Yang,Yang Huang
Polyaniline (PANI) is a promising cathode material for Zn-ion batteries (ZIBs) due to its intrinsic conductivity and redox activity; however, the achievements of PANI in high-performance ZIBs are largely hindered by its instability during the repeated charge/discharge. Taking advantage of the high conductivity, flexibility, and grafting ability together, a surface-engineered Ti3C2Tx MXene is designed as a silver bullet to fight against the deprotonation and swelling/shrinking issues occurring in the redox process of PANI, which are the origins of its instability. Specifically, the sulfonic-group-grafted Ti3C2Tx(S-Ti3C2Tx) continuously provides protons to improve the protonation degree of PANI and maintains the polymer backbone at a locally low pH, which effectively inhibits deprotonation and brings high redox activity along with good reversibility. Meanwhile, the conductive and flexible natures of S-Ti3C2Tx assist the fast redox reaction of PANI and concurrently buffer its corresponding swelling/shrinking. Therefore, the S-Ti3C2Tx-enhanced PANI cathode simultaneously achieves a high discharge capacity of 262 mAh g–1 at 0.5 A g–1, a superior rate capability of 160 mAh g–1 at 15 A g–1, and a good cyclability over 5000 cycles with 100% coulombic efficiency. This work enlightens the development of versatile MXene via surface engineering for advanced batteries.
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Nano Research
·
2020
·Vol. 13
·期 4
·1090-1099
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IF 8.183
Wang Yiyan,Kumar Anuj,Ma Mang,Jia Yin,Wang Yu,Zhang Ying,Zhang Guoxin,Sun Xiaoming,Yan Zifeng
Carbon materials featuring hierarchical pores and atomically dispersed metal sites are promising catalysts for energy storage and conversion applications. Herein, we developed a facile strategy to construct functional carbon materials with a fluffy peony-like structure and dense binary FeCo-N x active sites (termed as f-FeCo-CNT). By regulating the metal content in precursors, a three-dimensional (3D) interconnected conductive carbon nanotubes network was in-situ formed throughout the atomically dispersed FeCo-NC matrix during pyrolysis. Taking advantage of rich pore hierarchy and co-existence of highly active FeCo-N x sites and beneficial FeCo alloy nanoparticles, the f-FeCo-CNT material exhibited excellent bifunctional performance towards oxygen reduction reaction/oxygen evolution reactions (ORR/OER) with respect to the atomically dispersed FeCo-NC (SA-f-FeCo-NC) and commercial Pt/C+RuO 2 mixture, surpassing the SA-f-FeCo-NC with a 20 mV higher ORR half-wave potential and a 100 mV lower OER overpotential (at 10.0 mA/cm 2 ). Remarkably, the f-FeCo-CNT-assembled Zn-air battery (ZAB) possessed a maximum specific power of 195.8 mW/cm 2 , excellent rate capability, and very good cycling stability at large current density of 20.0 mA/cm 2 . This work provides a facile and feasible synthetic strategy of constructing low-cost cathode materials with excellent comprehensive ZAB performance.
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JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Xixi Wang,Lei Ge,Qian Lu,Jie Dai,Daqin Guan,Ran Ran,Shih-Chang Weng,Zhiwei Hu,Wei Zhou,Zongping Shao
Constructing catalysts with a low overpotential for the oxygen evolution reaction (OER) is critical for the increased application of rechargeable Zn-air batteries. Herein, an in-situ cobalt extraction and simultaneous coordination growth strategy is adopted to develop an active and robust interface between nanostructural Co-metal-organic framework (Co-MOF) pillars and perovskite LaCoO 3-δ (LC). Moreover, the multi-active cobalt sites, including Co 3+ in the LC and coordinatively unsaturated cobalt sites in the Co-MOF, could promote the deprotonation of oxygen adsorption intermediates and act as catalytic active centres. Therefore, the optimal sample exhibits excellent OER activity with a low overpotential of 330 mV. Notably, the Zn-air battery with Co-MOF/LC-0.5 as the OER catalyst exhibits a low charge potential of 2.03 V and excellent cycling stability. This work illustrates efficient electrochemical catalysts based on perovskites with low overpotentials that are prepared by an in-situ growth strategy, and have great potential in rechargeable Zn-air batteries.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 11
·5699-5708
·
IF 11.301
Xin Qian,Dongyang Wang,Yang Zhang,Haijun Wu,Stephen J. Pennycook,Lei Zheng,Pierre F. P. Poudeu,Li-Dong Zhao
The metallic elements with a small atomic radius can not only compensate for the intrinsic vacancies to improve the carrier mobility, but also can form interstitials to reduce lattice thermal conductivity. In this work, we investigate the contrasting roles of three different metallic elements with small atomic radius on the thermoelectric properties of n-type PbM0.01Se (M = Cu, Zn, Ni). We find that all the metallic elements can increase the carrier concentration as electron donors and improve the electrical transport properties. In addition, the lattice thermal conductivity of PbSe can be significantly decreased through the formation of interstitials by the incorporated extra metallic elements. We also find that the PbCu0.01Se sample exhibits a unique and complex behavior compared with the other samples due to the diffusion and the thermally activated oxidation of Cu+ ions. When the temperature increased to 673 K, the carrier concentration of PbCu0.01Se sample increases suddenly and continues to increase by nearly two folds, which we ascribe to the release of 3d orbital electrons in Cu+ ions. This results in a strong decoupling of the charge and heat transport in the material, which can be manifested by the overestimation of the electronic thermal conductivity when assuming strong electron–phonon coupling in Wiedemann–Franz law. A maximum ZT of ∼1.6 can be reached at 773 K and the average ZT of ∼0.96 can be achieved in PbCu0.01Se. Our results demonstrate the exceptional contrasting behavior of Cu in PbSe by comparing with Zn and Ni, and the thermoelectric performance of n-type PbSe can be enhanced through the introduction of extra metallic elements with small radius.
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Materials Today Energy
·
2021
·
IF 7.311
S. Zhai,Y. Luo,Z. Fan,M. Zhou,K. Hou,H. Zhao,M. Hu,Y. Xiao,K. Jin,Y. Zhao,X. Li,Z. Cai
A new strategy has been designed for enhancing the electrochemical performances of the supercapacitor and water-splitting electrodes. Hetero-structure composite electrode based on copper sulfide (CuS), zinc oxide (ZnO), and porous carbonized cotton (PCc) is prepared via vacuum thermal evaporation technology and successive ionic layer adsorption methods. Porous substrate provides plenty of active sites, which facilitates the exchange of ions/charges in the electrode processes. The composite electrode exhibits outstanding electrochemical energy storage and electrocatalytic performances. The symmetrical supercapacitor as assembled reaches a high energy density of 0.27 Wh cm −2 at the power density of 3.34 W cm −2 . By optimizing the composite structure, the energy barriers of the CuS/ZnO/PCc compound are reduced obviously in oxygen evolution reaction in comparison with pure PCc or CuS/PCc. The overpotential of the sample is decreased to 337 mV (10 mA cm −2 of the loop current) compared to that of PCc (492 mV) and CuS/PCc (415 mV). This work may inspire the rational design of composite electrode materials to achieve high performance in cross-field applications.
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CRYSTENGCOMM
·
2019
·Vol. 21
·期 42
·6414-6422
·
IF 3.382
Rui Zhang,Wanqing Song,Mingjing Wang,Huiming Ji
Metal–organic framework (MOF) materials with controlled microstructures have become popular in the last few decades. In this study, Zn-MOF precursors with diverse crystallinity and particle size (20–800 nm) were synthesized using an accelerating or retarding nucleation process by introducing various secondary ligands, which were employed as modulators in the coordination and ligand exchange equilibria according to their different acidity coefficients. Thus, the pore size of MOF-derived ZnO clusters was different, resulting in diverse gas sensing properties. Moreover, large precursor-derived ZnO-(2 and 3) assemblies with the micropore sizes of 1 nm and 0.75 nm showed size-selective sensing and better performance, which exhibited a higher and fast response (4 s) to butanone and n-butanol with the lengths of 0.664 nm and 0.499 nm, respectively, and a low limit of detection (0.1 ppm). This simple method of controlling the nucleation of MOFs and the pore size of ZnO assemblies paved a new way towards the design of the microstructure of MOF-based functional materials.
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危险品化学品经营许可证（带存储）