NANO LETTERS
·
2018
·
IF 12.08
Meiying Leng,Ying Yang,Zhengwu Chen,Wanru Gao,Jian Zhang,Guangda Niu,Dengbing Li,Haisheng Song,Jianbing Zhang,Song Jin,Jiang Tang
Metal halide perovskite quantum dots (QDs) recently have attracted great research attentions. However, blue-emitting perovskite QDs generally suffer from low photoluminescence quantum yield (PLQY) because of easily formed defects and insufficient surface passivation. Replacement of lead with low toxicity elements is also preferred toward potential commercial applications. Here, we apply Cl-passivation to boost the PLQY of MA3Bi2Br9 QDs to 54.1% at the wavelength of 422 nm, a new PLQY record for blue emissive, lead-free perovskite QDs. Because of the incompatible crystal structures between MA3Bi2Br9 and MA3Bi2Cl9 and the careful kinetic control during the synthesis, Cl– anions are engineered to mainly locate on the surface of QDs acting as passivating ligands, which effectively suppress surface defects and enhance the PLQY. Our results highlight the potential of MA3Bi2Br9 QDs for applications of phosphors, scintillators, and light-emitting diodes.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 9
·1900454
·
IF 3.163
Xue Li,Yujie Zhang,Jingwei Shen,Shun-an Cao,Ting Li,Fei Xu
Rechargeable Mg batteries are attractive candidates for large-scale energy storage batteries with high safety due to the low-cost and non-dendritic metallic Mg anode. However, exploring high-performance cathode materials is blocking their development. Herein, a high-rate rechargeable Mg battery is established with a AgCl cathode, delivering a high reversible capacity of 70.3 mAh g −1 at 100 mA g −1 , an outstanding rate capability of 32.6 mAh g −1 at 1000 mA g −1 , and a superior long-term cyclability over 500 cycles. Further investigation of the mechanism demonstrates that a conversion reaction takes place between AgCl and metallic Ag 0 for the cathode. The solid-state Mg 2+ diffusion coefficient is as high as 8.1 × 10 −11 cm 2 s −1 , which would be the reason for the high rate capability. The current study reveals significant insights to select promising Mg-storage conversion cathodes by a combination of soft anions and soft transition-metal cations.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yisheng Zhang,Qian Li,Huayi Li,Li Wang,Youliang Hu
Here we report a facile method to prepare nitrogen-doped porous carbon with controllable specific surface area and nitrogen content through pretreated chlorinated polypropylene with nitrogen-containing compounds(NCCs). The microstructure and porous textures of the obtained carbons are characterized by BET, SEM, TEM, XRD and Raman, respectively. SEM shows that pore structure can be found in carbon matrix. And with the increase of nitrogen content, more amorphous carbon are observed in Raman spectral. The results show that the specific surface areas are effectively increased from 1000 m 2 /g to 3269 m 2 /g when the structure of NCCs have a nitrogen-contained hexatomic ring, and nitrogen content are apparently raised from 1.3 at% to 27.73 at% when the NCCs contain guanidyl structure. Besides, XPS shows that when the nitrogen content is relatively low, nitrogen emerge at carbon matrix mainly in form of pyrrolic-N, and with the increase of nitrogen content, the pyridinic-N become the main structure of nitrogen in carbon.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Cheng Yuan,Deng-Jing Chen,Qiu-Xiang Ye,Kai Xiao,Li-Sheng Hao,Yan-Qing Nan
The CO 2 /N 2 -triggered switchable sol–gel transition based on sodium deoxycholate (NaDC) and sodium chloride (NaCl) aqueous solutions has been investigated using both experiments and molecular dynamics (MD) simulations. The effects of CO 2 on the phase behavior, viscosity, pH, electrical conductivity, and microstructure of the NaDC/NaCl mixed system were explored. The mixed system exhibits a recycled CO 2 /N 2 response, and switching between solution state and gel state with six orders of magnitude variation in shear viscosity was achieved within a narrow pH range of 7.82–7.20. The FT-IR and 1 H NMR spectra of the mixed system before and after CO 2 bubbling were measured. The experimental results indicate that NaDC is not directly protonated to deoxycholic acid by the small amount of CO 2 present; instead, an acid salt structure with a strong hydrogen bond , that is, [RCOOH⋯OOCR] − , is formed. MD simulation results reveal that, in the aqueous mixed NaDC/NaCl/CO 2 system, three types of bridging hydrogen bonds between two deoxycholate (DC − ) anions and one H 3 O + or HCO 3 − ion are key factors for the formation of hydrogels. These bridging hydrogen bonds promote the formation of DC − pairs bridged by H 3 O + or HCO 3 − ions (including the acid salt structure) and are beneficial to the growth of micelles and formation of hydrogels. It is worth noting that the bridging hydrogen bond connected by HCO 3 − ions is an aspect of CO 2 -induced hydrogels that distinguishes them from acid-induced hydrogels. In addition, the results indicate that CO 2 and NaCl have a synergistic effect when inducing hydrogel formation. Based on experiments and MD simulations, a CO 2 /N 2 -switchable sol–gel transition mechanism for an aqueous mixed NaDC/NaCl system has been proposed.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 7
·499
·
IF 3.504
Guangyang Liu,Ruonan Zhang,Lingyun Li,Xiaodong Huang,Tengfei Li,Meng Lu,Donghui Xu,Jing Wang
Monitoring of low levels of chlorsulfuron in environmental water samples is important. Although several detection methods have been developed, they all have some drawbacks, such as being time-consuming, requiring expensive instruments and experienced operators, and consuming large volumes of organic solvents. There is an urgent need for a simple, rapid, and inexpensive detection method for chlorsulfuron. Herein, such a method was developed using anti-aggregation of gold nanoparticles (AuNPs) in the presence of acetamiprid in agricultural irrigation water samples. Aggregation of the AuNPs was induced by acetamiprid, and this produced a distinct color change from Bordeaux red to blue. However, the strong hydrogen bonding interaction between chlorsulfuron and acetamiprid could inhibit AuNP aggregation. The effect of chlorsulfuron on the anti-agglomeration behavior of AuNPs was monitored by ultraviolet–visiblespectroscopy (UV-Vis) and the naked eye over a concentration range 0.1–100 mg/L. The detection limit for chlorsulfuron was 0.025 mg/L (signal-to-noise ratio of three). This colorimetric method was successfully applied to the determination of chlorsulfuron in spiked tap water and agricultural irrigation water with satisfactory recoveries (76.3%–94.2%).
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Bai-ren Yang,Zhu-qiu Sun,Li-ping Wang,Zhao-xia Li,Cheng Ding
A strain, Brevibacillus agri DH-1, isolated from dry lands was used to remove m -dichlorobenzene. After 48 h culturing, the concentrations of m -dichlorobenzene decreased from 26–130 to 7.87–28.87 mg/L and dry cell weight for bacterial growth reached 52.43–75.05 mg/L. The growth and degradation kinetics were analyzed by the fitting of Haldane-Andrews model and pseudo first-order model. A degradation pathway was proposed according to major intermediates (phenol), chloride ion variation, ring-opening enzyme activity, and high mineralization (0.47 g Cl- /g m -dichlorobenzene , 0.65 g co2 /g m -dichlorobenzene , 0.15 g DCW /g m -dichlorobenzene ). In addition, the performance in a biotrickling filter (BTF) was evaluated through removal efficiency and pressure drop values with increasing inlet loading rate from 4.10 to 122.57 g/m 3 /h at three empty bed residence time points (30 s, 60 s, and 90 s). The results demonstrated that strain DH-1 possessed high removal efficiency and stable operation in a BTF.
研究领域:
环境生物学
·
微生物学
·
污染控制技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ping Lv,Ronghao Liu,Yangyang Wang,Xiaoxia Liu,Yang Wu,Wenfeng Xue,Yanzhao Yang
In this study, a novel gemini-type benzimidazole ionic liquid [C 6 BIM 2 ][NTf 2 ] 2 was synthesized for efficient extract gold(III) from hydrochloric acid medium. Firstly, a series of parameters (e.g., vibrating time, the extractant concentration, acidity and salinity) were optimized and obtained the optimal extraction condition. Under this condition, the extraction efficiency can reach 98.42%, along with the distribution ratio of 186.87. Through the response surface methodology (RSM) model optimization, the amount of [C 6 BIM 2 ][NTf 2 ] 2 corresponding to different HCl concentration was determined for gold(III) extraction during actual operation. Then, verified the anion exchange mechanism with the aid of Job’s method, UV–vis, FT-IR and 13 C NMR. Thermodynamic parameters were calculated and implied that the extraction reaction was an exothermic and spontaneous process. Furthermore, organic phase loaded with gold(III) was easy to be completely stripped by CS(NH 2 ) 2 / HCl solution and its extraction ability was kept constant after 5 cycles extraction experiments. Meanwhile, [C 6 BIM 2 ][NTf 2 ] 2 has a superb ability to select gold(III) in the multi-metal solution. In general, [C 6 BIM 2 ][NTf 2 ] 2 showed distinguished selectivity and extraction ability for gold(III) from secondary resources, which was claimed to be a promising new style extractant.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 16
·期 1
·110-115
·
IF 3.879
Zhenglin Zhang,Haiyan Song,Shishu Zhang,Junyan Zhang,Wenya Bao,Quanqin Zhao,Xiang Wu
Epichlorohydrin (ECH) is mainly an industrial raw material, while it is toxic and dangerous for human health, so finding a simple and effective method for detecting ECH gas is challenging work. Porous SnO2 structures are successfully obtained through a hydrothermal method using SnCl4·5H2O as the tin source and water as the solvent. Ag nanoparticle (NPs) decorated porous SnO2 structures have also been prepared by the impregnation method. The morphology and structure of the as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and the nitrogen adsorption–desorption technique. The as-synthesized nanostructures, with diameters ranging from 4–5 μm, are composed of porous nanosheets with an average thickness of 60 nm. The gas sensing properties of the Ag NPs decorated porous SnO2 structures for ECH gas were investigated in detail, and the results showed that the 10% Ag NPs decorated porous SnO2 structures gas sensor was the optimum sensor, demonstrating a response (S = 50) for 100 ppm of ECH gas, while the working temperature was decreased by about 180 °C. In addition, it showed a low detection level (0.5 ppm) for ECH gas, good reproducibility and repeatability, and long-term stability, implying a promising application in detecting ECH gas.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 4
·2971-2978
·
IF 1.354
Yang Yuxiang,Zhao Min,Yao Pingping,Huang Yan,Dai Zuocheng,Yuan Hongming,Ni Chaoying
In the present work, three differently shaped mesoporous silica nanoparticles, spherical nano-SiO2, tubular mesoporous SiO2 and vesicle-like mesoporous SiO2 (VSL), were prepared and used to immobilize Horse radish peroxidase (HRP), and their enzyme’s
activity was also evaluated. It was found that the VSL immobilized HRP displayed higher specific activity than free enzyme and other two differently shaped silica immobilized HRP. After immobilization, the thermal stability, pH tolerance resistance and storage stability on vesicle-like SiO2
were studied as well. In addition, the kinetic constants K
m and V
max for HRP were significantly altered by immobilization. The affinity for HRP towards its substrate increased (with decreasing K
m), leading to enhanced catalytic efficiency
(with increased V
max). Moreover, the reusability for degradation of methoxychlor (MXC) by VSL immobilized enzyme was studied and its degradation products were detected by GC-MS and NMR analysis.
研究领域:
生物化学
·
环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Atian Xie,Jiangdong Dai,Xiang Chen,Ping Ma,Jinsong He,Chunxiang Li,Zhiping Zhou,Yongsheng Yan
In decade years, antibiotics residual has received considerable attention because of their detrimental effects on human health and the ecosystem, thereby resolution of this issue become a burning research project. Herein, we first prepared a novel sustainable hierarchical porous carbons (HPCs) (named LCTA) via the combination of halloysite nanotubes-template and in-situ KOH activation, using industrial by-product sodium lignin sulfonate (SLS) as biomass precursor. It was demonstrated that both HNTs template and KOH activation played a key role in the enhancements of the porosity and accessible surface. LTCA exhibited a high specific surface area of 2320 m 2 /g and large pore volume of 1.342 cm 3 /g. Moreover, LTCA showed an ultrahigh adsorption capacity for tetracycline (TC) of 1297.0 mg/g and chloramphenicol (CAP) of 1067.2 mg/g at 298 K, which are far higher than those adsorbents previously reported. Additionally, fast adsorption kinetics, excellent environmental adaptability and good regeneration ability make this novel HPC as a promising material for antibiotics wastewater treatment practices.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Nature Sustainability
·
2020
·Vol. 3
·期 5
·386-390
·
IF 12.08
Lang Jialiang,Jin Yang,Liu Kai,Long Yuanzheng,Zhang Haitian,Qi Longhao,Wu Hui,Cui Yi
Lithium (Li) is an important resource for the sustainability of socioeconomic systems given its wide use in various industrial applications. The industrial production of Li metals relies on the electrolysis of a mixture consisting of high-purity lithium chloride (LiCl) and potassium chloride. However, the purification of LiCl is expensive and unsustainable, requiring a substantial amount of energy and the use of noxious chemical reagents, so that producing high-purity Li efficiently and sustainably is a challenge. Herein we report a new method of producing high-purity electrolytic Li from low-purity LiCl using solid-state electrolyte. Taking advantage of the high Li-ion selectivity of the solid electrolyte, we directly obtained high-purity metallic Li through the electrolysis of low-purity LiCl. Our new method provides two important advantages over conventional methods: (1) the cost of producing high-purity Li is reduced by using low-purity LiCl from low-grade brine, and the simpler purification process reduces the use of energy and chemical reagents; and (2) the operating temperature of the electrolytic process decreases from 400 °C to 240 °C, leading to an additional reduction in energy use.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Feilong Dong,Cong Li,Guilin He,Xinbo Chen,Xinwei Mao
As a new type of environmental micro-organic pollutant, sulfonamides (SAs) have been shown to damage organisms if they are exposed to them over the long term. Moreover, an increasing number of SAs has been detected in natural water and urban water supply systems in recent years because they cannot be completely removed through conventional water treatment processes. Therefore, sulfamethazine (SMZ) in urban water systems was selected as a target to be investigated. The reaction kinetics of sulfamethazine chlorination were studied in a pilot-scale water distribution system (WDS) under the influence of different factors, including pH, temperature, flow rate and pipe materials, to determine the optimal factors for removing SMZ and to provide a reference for water quality in urban drinking water systems. According to the experimental results, the kinetics models of SMZ chlorination fitted a second-order reaction in pure water. The degradation of SMZ was not only affected by the water quality conditions but also the operating temperatures, flow rates and pipe materials. The rate constants of SMZ chlorination under different temperatures were related to the Arrhenius equation. Different flow rates had little effect on SMZ degradation. In different pipes, the degradation rates of SMZ followed the order stainless-steel pipe > polyethylene pipe (PE) > ductile iron pipe. Moreover, eight reaction intermediates during SMZ degradation were observed and identified, and a degradation pathway was proposed. The concentrations of trihalomethanes (THMs) and haloacetic acids (HAAs) during the degradation of SMZ in WDS were also determined.
研究领域:
环境科学
·
公共卫生
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）