查找使用阿拉丁产品的科研文献

Potential of montmorillonite and humus-like substances modified montmorillonite for remediation of Pb and Zn-contaminated soils

Kun Jiang,Aihua Xiang,Kun Liu,Qian Peng

Pb and Zn pollution for soil are becoming more and more serious, strengthening the treatment of contaminated soils is conducive to the sustainable development of soil. In this study, the humus-like substances modified montmorillonite (HLS-MMT) were synthesized to remediate the Pb and Zn-contaminated soils. The application of HLS-MMT in simulated and actual contaminated soil were carried, and the long-term stability of HLS-MMT was evaluated. The results showed that the mobility, bioavailability and leachability of heavy metals (HMs) significantly decreased after remediating by HLS-MMT. Compared with MMT, the TCLP leaching ratio ( TLr ) of Pb and Zn reduced by 9.27–13.96% and 10.3–13.18%, while the DTPA effectiveness ( DEr ) Pb and Zn reduced by 9.11% and 8.76% in simulated soil, respectively. Moreover, the aging experiments proved that HLS-MMT possessed a stability to resistance the freeze-thaw cycles, wet and dry alternation, and acid rain leaching. This article provides some theoretical basis for the soil remediation .

Modulating acid site spatial location of Zn/ZSM-5 catalyst to boost the stable aromatization of hexane

Hao Yan,Delun Ren,Zhiqiang Li,Junshu Chen,Xinyang Zhang,Yanhao Wang,Gongzheng Duan,Xiang Feng,Xin Zhou,Yibin Liu,Xiaobo Chen,Chaohe Yang

Engineering acid site spatial location of zeolite catalyst harbors tremendous potential to boost catalytic performance but still remains a grand challenge for aromatization reaction. Herein, we successfully manipulate acid site spatial location inside the ZSM-5 channels to promote the hexane aromatization via the simple SiO 2 coating treatment. Multi-techniques demonstrated that the medium strong L acid in the channel originated from the Si(Al)  O  Zn structure is mainly retained in the Zn/ZSM-5-Si catalyst by covering the acid sites outside the channel. Surprisingly, there is a good linear relationship between BTEX yield and this medium strong L acid content. Based on the reaction kinetics, in situ FT-IR and theoretical calculations, it is found that the L acid with confinement effect served as the main active site could prominently enhance the cyclization of propene intermediate and the dehydrogenation of cycloalkane due to the strong affinity between the C/H and ZnOx, and control the desorption of BTEX (mainly benzene, toluene, ethylbenzene, and p-xylene) by weakening the binding of hydrogen proton to π electrons. Compared with the ordinary Zn/ZSM-5 catalyst, the yield of BTEX is increased by nearly 10%, and the Zn/ZSM-5-Si catalyst exhibits excellent anti coking deactivation ability. This strategy together with mechanistic results may pave the rational design of efficient Zn/ZSM-5 catalysts for aromatization reaction.

Water-activation-facilitated photocatalytic CO2 reduction by a heterogeneous synergetic single-atomic Zn sites and Pd nanocrystals

Mingna Chu,Kai Cui,Yan Zhou,Xiuzhi Yuan,Wei Qin,Yang Li,Xiaohong Wu

Enhancing the photoreduction of carbon dioxide (CO 2 ) to produce valuable chemicals, such as carbon monoxide (CO), is of significant importance. The bottleneck in developing advanced catalysts lies in the rational design of catalytic centers with efficient CO 2 activation and hydrogen proton production. In this work, palladium nanoparticles (Pd NPs) were successfully modified on UiO-66-NH 2 -Zn SAs (UN-Zn SAs) by a photo-deposition method. The optimized photocatalyst , 4 Pd NPs-UN-0.7Zn SAs, demonstrated exceptional performance in converting CO 2 to CO, exhibiting approximately 1.4-fold and 7.8-fold enhancements compared to UN-0.7Zn SAs and UN, respectively. A combination of time-resolved photoluminescence spectroscopy and electron paramagnetic resonance results unveiled that the introduction of Pd NPs effectively promoted the photogenerated charge separation and facilitated water activation to produce more hydrogen protons. The generated hydrogen protons were subsequently coupled with nearby CO 2 that was activated by Zn SAs, thus achieving the facile water-activation-induced CO 2 reduction process. Theoretical calculations further confirmed that the heterogeneous synergistic effects between Zn SAs and Pd NPs lowered the energy barrier for the rate-limiting step of CO 2 conversion to COOH* , thereby achieving efficient photocatalytic CO 2 reduction reactions. This work provides a new perspective on the development of efficient catalysts for the effective conversion of CO 2 .

A multichromatic colorimetric detection method for Vibrio parahaemolyticus based on Fe3O4-Zn-Mn nanoenzyme and dual substrates

Wenteng Qiao,Luliang Wang,Kun Yang,Yushen Liu,Quanwen Liu,Feng Yin

Nitrogen-doped Zn/Fe@PCN derived from metal–organic frameworks activating persulfate to efficiently degrade rhodamine B

Zhong Dengjie,Liu Peng,Liu Yi,Xu Yunlan

The Zn/Fe@N-doped porous graphitic carbon catalyst (Zn/Fe@PCN) was successfully produced through one-step pyrolysis of g-C 3 N 4 and Zn/Fe-MOF and was used for the activation of persulfate (PS) for the degradation of RhB. The Zn/Fe@PCN/PS system was able to degrade 95.92% of RhB in 30 min at a rate of 0.6453 min −1 when RhB was concentrated at 50 mg L −1 . The efficient degradation of RhB is primarily realized through the synergistic activation of PS by Zn, Fe, and N to produce reactive oxygen species 1 O 2 , \(\cdot{\mathrm{O}}_2^-\) , \(\cdot \mathrm{SO}_4^-\) , and ·OH. Zn 0 /Fe 0 in Zn/Fe@PCN forms a galvanic cell with carbon to release electrons to join in the activation of PS. The doping of Zn not only provides sufficient electrons for the activation of PS but also promotes the effective reduction of Fe 2+ and thus the Fe 2+ /Fe 3+ cycle. The N doping accelerates the electron transfer during the reaction progress.

Facilitating photogenerated carrier transfer and water oxidation kinetics of BiVO4 photoanode via novel Zn@Co3C functional layer

Weibing Li,Liming Wang,Jie Zhou,Ning Wang,Xinyang Fu,Yibo Wang,Yuyu Bu,Yaping Zhang,Lei Wang

Currently, the sluggish charge transfer kinetics and water oxidation kinetics are still the bottlenecks faced by BiVO 4 photoanodes at present. Herein, an excellent Zn@Co 3 C functional layer is reported for the first time to tackle these problems of BiVO 4 photoanode. Zn@Co 3 C was prepared using a facile electrochemical method with 1,2-dimethylimidazole as a carbon source. In the BiVO 4 /Zn@Co 3 C photoanode, Co 3 C acts as a novel oxygen evolution co-catalyst to significantly enhance water oxidation kinetics. An electron depletion layer formed around Zn species provides a strong driving force for the migration of photogenerated holes from BiVO 4 to Co 3 C catalytic sites. Furthermore, the alternating distribution of Co 3 C and Zn species on the surface of BiVO 4 photoanodes increases the utilization efficiency of Co 3 C co-catalyst. The BiVO 4 /Zn@Co 3 C system constructed in this work not only demonstrates good photoelectrochemical performance in electrolytes (4.6 mA cm −2 at 1.23 V vs. RHE without any hole scavengers), but also enables water splitting in natural seawater. This work demonstrates a novel functional layer that simultaneously facilitates photogenerated carrier transfer and water oxidation kinetics, which holds great promise for constructing high-performance water oxidation systems in various photoanodes.

Enhanced polymerization interface of Ni12P5 nanowires toward high-rate and durable cathode for alkaline Ni–Zn batteries

Ze Wang,Pei Shi,Qin Liu,Jingying Li,Yi Gan,Jia Yao,Jinghong Xia,Xin Liu,Xin Chen,Ke Qian,Xiang Liu,Lin Lv,Guokun Ma,Li Tao,Jun Zhang,Hanbin Wang,Houzhao Wan,Hao Wang

Alkaline nickel-zinc batteries have attracted more attention due to their inherent safety and high specific energy. However, the cycling stability of Ni–Zn batteries is still an urgent problem. Herein, we fabricate the Ni 12 P 5 @PANI core-shell structure by polyaniline cladding on the Ni 12 P 5 nanowires . The polyaniline not only effectively improves the specific capacity of Ni 12 P 5 , but also greatly enhances the cyclic stability. The optimized Ni 12 P 5 @PANI nanowires provide a specific capacity of 272.8 mAh g −1 at 1 A g −1 (189.2 mAh g −1 at 10 A g −1 , 69.4% retention rate) and long-life cycling (93% capacity retention after 1000 cycles at 10 A g −1 ). Moreover, the theoretical calculations indicate that the polyaniline is easy to polymerize on the surface of Ni 12 P 5 , and the lower formation energy verifies that the polyaniline shell layer can effectively promote the structural stability of Ni 12 P 5 , thus enhancing the cycle life. In addition, the assembled Ni 12 P 5 @PANI//Zn battery retains 112.3% capacity retention after 500 cycles at 3 A g −1 , and provides a high energy density of 287.9 Wh kg −1 and power density of 49.1 kW kg −1 (based on the mass of active substance). This work provides a feasible high-rate and durable cathode material for alkaline Ni–Zn batteries.

Modulation of reaction pathway of Prussian blue analogues derived Zn-Fe double oxides towards organic pollutants oxidation

Liang Zhang,Bofan Zhang,Yunxia Liu,Zinan Wang,Jafar Hussain Shah,Rile Ge,Wenhui Zhou,Shiro Kubuki,Junhu Wang

The radical-based Fenton-like reaction quenching by various inorganic anions or high concentration of organic matters restrict the practical value in future industrial application. Contrarily, the nonradical-dominated system could efficiently overcome above limitations and achieve excellent catalytic capacity under a wide category of water matrixes. Herein, a series of Zn-Fe double oxides were successfully fabricated via calcination of Zn 1-x Fe x -Fe Prussian blue analogues under ambient atmosphere. Under the coexistence of visible light and peroxymonosulfate (PMS), Zn-Fe double oxides manifested excellent catalytic performance towards various organic pollutants oxidation with trace amount of iron leaching, and even showed superior contaminant decomposition efficiency under high concentration of organic matter and practical aqueous system. Confirmed by radical trapping experiment and electron paramagnetic resonance spectroscopy, the photo-induced electrons and holes can act as triggers to PMS activation and thereby transform reaction routes from radicals to singlet oxygen ( 1 O 2 )-dominated nonradical pathway over the prepared Zn-Fe double oxides. This work provided new insights and comprehension into modulating radical and nonradical pathways of PMS-based advanced oxidation process for refractory contaminant oxidation via utilizing solar energy.

Facile Synthesis of NixCo3−xS4 Microspheres for High-Performance Supercapacitors and Alkaline Aqueous Rechargeable NiCo-Zn Batteries

Daojun Zhang,Bei Jiang,Chengxiang Li,Hao Bian,Yang Liu,Yingping Bu,Renchun Zhang,Jingchao Zhang

Electrochemical energy storage devices (EESDs) have caused widespread concern, ascribed to the increasing depletion of traditional fossil energy and environmental pollution. In recent years, nickel cobalt bimetallic sulfides have been regarded as the most attractive electrode materials for super-performance EESDs due to their relatively low cost and multiple electrochemical reaction sites. In this work, NiCo-bimetallic sulfide NixCo3−xS4particles were synthesized in a mixed solvent system with different proportion of Ni and Co salts added. In order to improve the electrochemical performance of optimized Ni2.5Co0.5S4electrode, the Ni2.5Co0.5S4particles were annealed at 350 °C for 60 min (denoted as Ni2.5Co0.5S4-350), and the capacity and rate performance of Ni2.5Co0.5S4-350 was greatly improved. An aqueous NiCo-Zn battery was assembled by utilizing Ni2.5Co0.5S4-350 pressed onto Ni form as cathode and commercial Zn sheet as anode. The NiCo-Zn battery based on Ni2.5Co0.5S4-350 cathode electrode delivers a high specific capacity of 232 mAh g−1at 1 A g−1and satisfactory cycling performance (65% capacity retention after 1000 repeated cycles at 8 A g−1). The as-assembled NiCo-Zn battery deliver a high specific energy of 394.6 Wh kg−1and long-term cycling ability. The results suggest that Ni2.5Co0.5S4-350 electrode has possible applications in the field of alkaline aqueous rechargeable electrochemical energy storage devices for supercapacitor and NiCo-Zn battery.Keywords:NixCo3−xS4structures;micro/nanostructures;supercapacitors;Ni-Zn batteries

Enhancing Zn–CO2 battery with a facile Pd doped perovskite cathode for efficient CO2 to CO conversion

Heping Xie,Hailong Liao,Shuo Zhai,Tao Liu,Yifan Wu,Fuhuan Wang,Junbiao Li,Yuan Zhang,Bin Chen

Using aqueous Zn–CO 2 batteries to store renewable energy and produce valuable chemicals using CO 2 as the source is a promising method for CO 2 mitigation, that is alternative to traditional energy-costing CO 2 capture/storage technologies. However, the lack of efficient CO 2 -reduction catalysts significantly hinders the efficiency of such batteries. In this study, an efficient perovskite cathode, Pd-doped La 2 CuO 4 , was successfully developed for the cathodic CO 2 reduction reaction (CO 2 RR), and the optimal doping ratio of La 2 Cu 1-x Pd x O 4 ( x  = 0.05) was determined. Compared with the pristine La 2 CuO 4 catalyst, the current density for the CO 2 RR in the H-cell and the Faraday efficiency of CO production are both increased by ∼50% when operated −1.0 V (vs RHE). As a result, the peak power density of a Zn–CO 2 battery using the Pd-doped La 2 CuO 4 catalyst reached 0.75 mW cm −2 at 2.23 mA cm −2  by an enhancement ratio of 25%. Density functional theory calculations revealed that the *CO desorption processes on the cathode were enhanced owing to Pd doping, which accounted for the enhanced CO 2 RR activity and selectivity. The findings of this study show the potential application of perovskite catalysts in the cathode of Zn–CO 2 batteries and provide an effective method for battery performance enhancement via the facile Pd doping.

Inhibiting dendrites on Zn anode by ZIF-8 as solid electrolyte additive for aqueous zinc ion battery

Xianjin Gong,Jie Wang,Ying Shi,Qiang Zhang,Weixing Liu,Shan Wang,Jinlei Tian,Guichang Wang

Aqueous zinc ion batteries (AZIBs) are considered as one of the most promising alternatives for lithium-ion battery because of its high theoretical capacity, mild reaction with water, high hydrogen evolution potential and abundant natural reserves. However, the growth of anode dendrite and the attenuation of cathode capacity limit the application of zinc ion battery. Here, we propose that ZIF-8 can be used as an electrolyte additive for AZIBs to promote dendrite-free zinc anodic plating/stripping process. The results show that under the action of uniform ionic flux of ZIF-8, the zinc anode achieves a lifetime of more than 550 h, and significantly inhibits the occurrence of positive side reactions (106.1 mAh g −1 after 500 cycles at a current density of 1 A g −1 ). Density functional theory was used to systematically calculate the binding energy of Zn 2+ to different pore sizes of ZIF-8 and the results reveal that the adsorption capacity of ZIF-8 can control the migration of Zn 2+ . This work expands the application of MOFs in AZIBs and opens up a new door for future research about AZIBs based on MOFs.

A Silk Protein-Based Eutectogel as a Freeze-Resistant and Flexible Electrolyte for Zn-Ion Hybrid Supercapacitors

Zhongxu Li,Xueer Xu,Zhao Jiang,Jiayi Chen,Jiangping Tu,Xiuli Wang,Changdong Gu

A eutectogel (ETG) based on immobilizing a zinc salt deep eutectic solvent (DES) in a silk protein backbone is prepared by a coagulating bath method as a solid electrolyte for Zn-ion hybrid supercapacitors (ZHSCs). The Zn salt DES is composed by ethylene glycol (EG), urea, choline chloride (ChCl), and zinc chloride (ZnCl2) with a molar ratio of 6:10:3:3. A strong bonding of the DES liquid to the silk protein backbone is formed between protein macromolecules and the DES due to plenty of hydrogen bonds in both materials. The as-prepared ETG membrane is dense and has no obvious void defects, which possesses a fracture strength of 7.58 MPa and environmental stability. As a solid electrolyte, the ETG membrane exhibits a higher Zn2+ transference number of about 0.60 and a high ionic conductivity (12.31 mS cm–1 at room temperature and 3.63 mS cm–1 at −20 °C). A ZHSC (Zn∥ETG∥C) with the silk protein-based ETG electrolyte is assembled by Zn and active carbon as the anode and the cathode, respectively, which delivers a specific capacitance of 342.8 F g–1 at a current density of 0.2 A g–1 and maintains excellent cycling stability with 80% capacitance retention after 20,000 cycles at a high current rate (5 A g–1) at room temperature. Moreover, the Zn∥ETG∥C device can safely work under a lower temperature of about −18 °C and damaging situations, such as folding states and even cutting tests. The interface evolutions between the Zn anode and the ETG electrolyte are explored, and it was found that a ZnCO3/Zn(CH2OCO2)2 solid electrolyte interphase is in situ formed on the Zn anode, which can inhibit the growth of Zn dendrites. This work provides a new way to fabricate advanced electrolytes for applications in Zn-ion hybrid supercapacitors.