APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Yuqi Li,Yue Zhang,Zhiyuan Wang,Chengxu Zhang,Fanming Meng,Jianqiang Zhao,Xinpei Li,Jue Hu
Metal-Organic Frameworks (MOFs) materials with unique properties have attracted much attention in various fields. However, the limited number of active sites and the time-consuming synthesis process hinder their widespread application. Herein, this work demonstrates the first preparation of highly efficient and stable MOF (Fe-MOF-U) catalysts with enhanced specific surface area , morphology and active sites, through ultrasonic-assisted solvothermal method for oxygen evolution reaction (OER) electrocatalysis . The results show that the crystal size of Fe-MOF-U decreases significantly, and the specific surface area and pore size increase. In addition, many oxygen vacancies are produced in the crystal, making the reaction intermediates easier to form and thus improving the catalyst's oxygen evolution performance. The overpotential of Fe-MOF-U catalyst at 10 mA cm −2 is 221 mV, which is lower than that of the conventional solvothermal synthesized Fe-MOF-S (237 mV). Furthermore, the turnover frequency of the Fe-MOF-U catalyst is 3.32 s −1 at the overpotential of 300 mV, which is 5 times higher than that of Fe-MOF-S (0.70 s −1 ). In situ Raman and methanol molecular probe tests indicate a weakened adsorption of *OH on the Fe-MOF-U surface. DFT calculations are consistent with the characterization results, both proving that the ultrasonic-assisted solvothermal method can generate specific oxygen vacancy (μ 3 -O defect) in Fe-MOF-U which improved OER performance. This study provides a new idea for the morphology controlling and defect introduction of MOF and a new approach for its application.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Yuanchao Liu,Yanwu Chu,Zhenlin Hu,Siyu Zhang,Shixiang Ma,Muhammad Shehzad Khan,Feng Chen,Deng Zhang,Lianbo Guo,Condon Lau
Cleaner cosmetic production is crucial to our health. The detection of heavy metals in cosmetics is a hotspot in the past several years. Apart from the conventional analytical methods, laser-induced breakdown spectroscopy (LIBS) was recently applied as a rapid technique for trace heavy elements determination. However, the sensitivity obtained from the reported works do not, or marginally reach, the heavy metals standards in cosmetics required by regulatory bodies. Therefore, the sensitivity of LIBS still needs improvement to meet the standards. For this purpose, we developed an ultrasound-assisted extraction sample pretreatment method (UAE) for LIBS to detect the trace heavy metals lead (Pb) and cadmium (Cd) in low-quality cosmetics. A standard addition method was employed for elemental quantification by adding known amounts of analytes into the extracted solutions. Then, the calibration curves of Pb and Cd were established with good linearity. The limit of detections (LOD), ranging from 0.028 mg/kg (Pb) to 0.016 mg/kg (Cd), demonstrated the high-sensitivity of our work. Moreover, compared with the results by inductively coupled plasma mass spectrometry (ICP-MS), the LIBS indicated promising accuracy as the relative errors (RE) of Pb and Cd were 3.5% and 4.8%, respectively. The results indicated that the LIBS with UAE method is a sensitive and accurate technique for trace heavy metals determination in cosmetics.
研究领域:
分析化学
·
环境科学
·
健康与安全
✓ 已验证
DOI
高影响因子
FOOD AND BIOPRODUCTS PROCESSING
·
2019
·
IF 3.324
Liling Wang,Yifeng Zhou,Yanbin Wang,Yuchuan Qin,Bentong Liu,Minge Bai
Dihydromyricetin (DMY) is the main flavonoid present in vine tea and is also known to possess various beneficial health effects. Extractions of DMY from vine tea were investigated by ultrasonic-assisted extraction (UAE) with β-Cyclodextrin (β-CD) and ionic liquid (IL), which were the two green extraction methods attracting more attentions in recent years. Single factor and response surface methodology (RSM) were used in order to optimize the extraction conditions for obtaining maximum amount of DMY in the two approaches. The results of HPLC analysis showed that the addition of β-CD or 1-hexyl-3-methylimidazolium bromide ([HMim] Br) to the water solution had excellent effects on the extraction of DMY. In β-CD-UAE, the optimum conditions were 3.6% β-CD, ultrasonic time 8 min, liquid–solid ratio of 33 (mL/g), and ultrasonic power 360 W. Molecular docking results indicated that the ‘host-guest’ effect between β-CD and the molecule of DMY in water solution, which utilized molecular recognition and interactions through non-covalent bonding and hydrogen bonding is the main driver of the binding. And for IL-UAE, the optimal conditions were 1.25 mol/L [HMim] Br, ultrasonic time 5.5 min, liquid–solid ratio of 45 (mL/g), and ultrasonic power 240 W. Under above suitable conditions, the extraction yield of DMY can reach to about 40%; moreover, β-CD-UAE and IL-UAE can be easily applied for experimental or industrial scale in food or functional food use.
研究领域:
食品科学
·
植物化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Renhui Zhang,Xue Yang,Jibin Pu,Zhongyi He,Liping Xiong
We first fabricate MoS 2 nano-ball in isopropanol using sonication-assisted method. We systematically probe the lubrication mechanism of MoS 2 nano-ball in isopropanol. Hydroxylated MoS 2 nano-ball could effectively reduce the contact area for GCr15 steel balls and possess superior load-capacity and make the tribosystem achieve ultra-low friction and wear under 98 or 196 N and 600 rpm. For comparison, the lubricity of tribosystem sliding in isopropanol is conducted. Interestingly, graphene layers are formed sliding under 196 N and 600 rpm, the graphene-based transfer film on GCr15 steel ball makes the lubrication condition fast transfer from mixed lubrication condition to full film lubrication condition, which results in high friction and wear. The formation mechanism of graphene is discussed and proposed in details.
研究领域:
材料科学
·
摩擦学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Applied Research on Medicinal and Aromatic Plants
·
2021
·
IF 3.4
Weizhuo Tang,Bin Wang,Miaomiao Wang,Mengmeng Wang
In this work, optimization of ultrasound-assisted extraction (UAE) of Osmanthus fragrans (OF) fruit oils from four representative species of OF groups was firstly performed. A Box-Behnken design was applied to investigate and optimize the process variables. Among them, the specie of OF var. latifolius Makino (OFL) had the highest oil yield (18.53 %) by UAE under the optimal conditions with an ultrasound extraction time of 33 min, ultrasound temperature of 52 ℃ and liquid-to-solid ratio of 12 mL/g. Furthermore, the fatty acid composition, physicochemical characteristics, and antioxidant activity of OFL fruit oil extracts obtained through UAE and Soxhelet extraction (SE) were determined and compared. The results demonstrated that the oil yield and fatty acid composition between UAE and SE were similar, while the oil obtained by UAE displayed superior physicochemical properties and antioxidant activity . These findings suggest that UAE represents an effective method for OF fruit oil extraction.
研究领域:
食品科学
·
天然产物化学
·
油脂化学
·
抗氧化研究
·
提取工艺优化
✓ 已验证
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2023
·Vol. 15
·期 2
·2603-2617
·
IF 4
Yang Xiaojian,An Mengmeng,Han Nannan,Zhang Shu,Rong Qianqian,Lu Hui
The adsorption and removal of chlortetracycline (CTC) from water on peanut shells decorated with magnetic particles under ultrasonic were studied. The morphology, components, functional groups, magnetic properties and BET surface area of peanut shells before and after decorated with magnetic particles were characterized. Further, the effects of contact time, temperature and initial pH value on adsorption were investigated. Meanwhile, the adsorption kinetics and regeneration performance were studied. The CTC adsorption of magnetic peanut shells can reach 82.96%, and the adsorption behavior of CTC by magnetic peanut shells can be described using pseudo-second-order kinetics model. Finally, the adsorption capacity of CTC merely decreases by 9.52% after recycling five times, and solid-liquid separation can be easily achieved under magnetic field applied. Graphical
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理技术
✓ 已验证
DOI
高影响因子
Microstructures
·
2022
·Vol. 2
·期 3
·N
·
IF 0
Xueting Wang,Yunchuang Wang,Meichao Wu,Ruopian Fang,Xi Yang,Da-Wei Wang
This study introduces porous ZnO@C nanoplates to improve lithium-ion battery performance, and the addition of reduced graphene oxide (rGO) further enhances capacity at high current density.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能源存储
·
功能材料
✓ 已验证
DOI
CHROMATOGRAPHIA
·
2014
·Vol. 77
·期 23
·1653-1660
·
IF 1.37
Lv Tao,Zhao Xian-En,Zhu Shuyun,Ji Zhongyin,Chen Guang,Sun Zhiwei,Song Cuihua,You Jinmao,Suo Yourui
A novel hyphenated technique based on ultrasonic-assisted dispersive liquid–liquid microextraction (UA-DLLME) coupled with derivatization has been established for the determination of brassinolide (BL, a representative of brassinosteroids) by HPLC fluorescence detection. 9-Phenanthreneboronic acid is used as labeling reagent of BL. UA-DLLME parameters containing type and volume of extraction and disperser solvent, pH and ultrasonication time are optimized. Derivatization parameters are optimized included amount of 9-phenanthreneboronic acid, volume ratio of pyridine, derivatization time and temperature. Under optimal conditions, quantitative linear range of BL is 50–1,000 ng L −1 and excellent linear response is observed with correlation coefficient of 0.9996. Limit of detection and limit of quantification are calculated as 8.0 and 25.0 ng L −1 , respectively. RSDs of retention time and peak area are in the range of 0.68–0.97 % and 4.61–6.54 % for intra-day precision, 1.32–1.94 % and 7.28–9.75 % for inter-day precision, respectively. Accuracy is satisfactory in the range of 82.3–125.1 %. RSDs’ values of repeatability are in the range of 0.82–1.79 and 3.95–8.53 % for retention time and peak area, respectively. Enrichment factor for BL is 189. The results of recovery and matrix effect are in the range of 82.0–108.6 and 90.0–115.3 %, respectively. The proposed method has been applied for the determination of BL in Arabidopsis thaliana , Daucus carota and Brassica campestris L. leaves with much higher sensitivity than many other methods.
研究领域:
植物学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2016
·Vol. 26
·期 1
·51-60
·
IF 1.094
Hu Jiaoyu,Liu Jun,Wang Chunxia,Tang Xin
The core/shell nano-TiN-coated Al powders (TiN/Al) were prepared and added into A356 alloy by ultrasonic-assisted casting method in this work. The results show that TiN/Al has a better dispersion in A356 matrix and a stronger strengthening effect than TiN without the core/shell structure. With the addition of TiN/Al, most of the coarse primary α-Al dendrites of A356 turn into equiaxial. After T6 heat treatment, it is found that eutectic silicon in A356 with TiN/Al becomes columnar or globular in shape and smaller in size, which causes a greatly enhanced elongation of 11.7%. The results also suggest that the addition of nanoparticles can affect the precipitation behaviors and change the shapes and sizes of the precipitation.
研究领域:
材料科学
·
金属材料
·
凝固技术
·
复合材料
·
材料加工工程
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Teng Guo,Xin Hu,Guang Yang,Wei Long,Shengxian Yu,Jianwen Tian,Meiying Liu,Xiancai Li,Xiaoyong Zhang,Yen Wei
The fluorescent nanomaterials based on rare earth metal complexes have become one of the promising candidates for biomedical applications due to their unique optical properties . However, direct utilization of these rare earth complexes in biological systems is challengable for their poor water solubility. In this work, an ultrasonic treatment-assisted crosslinking reaction was developed for the first time to synthesize the fluorescent amphiphilic copolymers (named as Eu (TTA) 3 phen-HCCP-PEG), in which the hydrophobic europium complexes (Eu (TTA) 3 phen-NH 2 ) and hydrophilic polyethylene glycol were conjugated together using hexachlorocyclotriphosphazene (HCCP) as crosslinking agent. The reaction could be occurred uner room temperature , mild reaction conditions without using catalysts. Owing to the amphiphilicity of Eu (TTA) 3 phen-HCCP-PEG, fluorescent nanoparticles can be formed in aqueous solution. Thereinto, the uptake behavior of Eu (TTA) 3 phen-HCCP-PEG by cells and cell toxicity testing were also utilized to evaluate their potential applications in biomedical fields. Results demonstrated that these fluorescent nanoparticles are of small size, high water dispersibility and low toxicity. The above results implied that Eu (TTA) 3 phen-HCCP-PEG could be potentially for biological imaging and imaging-guided drug delivery etc.
研究领域:
材料科学
·
生物医学工程
·
化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2013
·
IF 2.206
Yan Wang,Chenghong Zhou,Wucong Wang,Yaping Zhao
A facile and general approach was developed to exfoliate layer materials to produce two-dimensional atomic crystals. A single and few layers of BN, MoS2, and WS2 were obtained via directly exfoliating their powder materials using supercritical CO2 assisted with ultrasound. The effects of supercritical CO2 coupled with ultrasound play a key role in the exfoliation process. The layer numbers and sizes of the BN, MoS2, and WS2 can be easily controlled by adjusting the power and the time of ultrasonication. The AFM images suggest single-layered BN, MoS2, and WS2 were produced, respectively. Their lateral sizes are about 0.5–2 μm, and almost 90% of the BN sheets are less than five layers. The electric diffraction patterns demonstrate that the crystallinities of the produced samples remained the same as that of the raw material during the exfoliating process. This novel technique is cost-effective and scalable, and can be widely used in the production of two-dimensional atomic crystals with high quality.
研究领域:
材料科学
·
纳米科技
·
物理化学
·
表面科学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2017
·
IF 3.981
Huazi Wang,Lu Hu,Xinya Liu,Shujun Yin,Runhua Lu,Sanbing Zhang,Wenfeng Zhou,Haixiang Gao
In the present study, a simple and rapid sample preparation method designated ultrasound-assisted dispersive liquid-liquid microextraction based on a deep eutectic solvent (DES) followed by high-performance liquid chromatography with ultraviolet (UV) detection (HPLC-UVD) was developed for the extraction and determination of UV filters from water samples. The model analytes were 2,4-dihydroxybenzophenone (BP-1), benzophenone (BP) and 2-hydroxy-4-methoxybenzophenone (BP-3). The hydrophobic DES was prepared by mixing trioctylmethylammonium chloride (TAC) and decanoic acid (DecA). Various influencing factors (selection of the extractant, amount of DES, ultrasound duration, salt addition, sample volume, sample pH, centrifuge rate and duration) on UV filter recovery were systematically investigated. Under optimal conditions, the proposed method provided good recoveries in the range of 90.2–103.5% and relative standard deviations (inter-day and intra-day precision, n = 5) below 5.9%. The enrichment factors for the analytes ranged from 67 to 76. The limits of detection varied from 0.15 to 0.30 ng mL −1 , depending on the analytes. The linearities were between 0.5 and 500 ng mL −1 for BP-1 and BP and between 1 and 500 ng mL −1 for BP-3, with coefficients of determination greater than 0.99. Finally, the proposed method was applied to the determination of UV filters in swimming pool and river water samples, and acceptable relative recoveries ranging from 82.1 to 106.5% were obtained.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）