JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.042
Qingxuan Zhang,Yingjie Liu,Zengmin Lun,Jinhe Liu,Yuhui Zhang,Pujiang Yang
Asphaltene stabilizers are the main means to inhibit the flocculation and sedimentation of asphaltenes in crude oil exploitation, transportation, and refining operations. In this work, the interactions between asphaltenes and 2-dodecyl benzene sulfonic acid, 4-dodecyl benzene sulfonic acid, 4-dodecyl aniline, 4-dodecyl phenol, polyisobutylene succinic imide benzene boric acid and polyisobutylene succinic imide benzene sulfonic acid were studied by XPS, XRD, DLS, TEM and SEM methods. The aggregation behavior of asphaltenes in the absence and presence of stabilizers was characterized by analyzing asphaltene’s particle size, surface composition, and aggregate microstructure. It was observed that the interactions between asphaltene and stabilizers decreased asphaltene aggregate size in solution, and that the polymeric stabilizer with an acidic group was superior to the small-molecule stabilizer with an acidic group, but both better than chemicals with basic groups. It was found that stabilizer adsorption on asphaltenes affected the O, N, S contents of asphaltene surface and prompted formation of protonated pyridinic N+ and nitrogen-oxide -R-N+-O-, which further revealed that an acid-base reaction was the most effective at stabilizing asphaltene-stabilizer complexes, followed by π-π interactions and hydrogen bonds. We also found that the synergistic effects of π-π and acid-base reactions stimulated the transformation of 2-dodecyl benzene sulfonic acid adsorbed on asphaltene from the vertical state at low concentrations to the tiled arrangement at high concentrations. XRD results showed that adsorption of stabilizers on asphaltene increased the distance of asphaltene aromatic sheets and decreased the aggregation number of asphaltene to below the critical aggregation number of asphaltene tactoids.
研究领域:
石油化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Xianhua Zhong,Danqun Huo,Huanbao Fa,Xiaogang Luo,You Wang,Yanan Zhao,Changjun Hou
Biogenic amine (BA) is an appropriate indicator of food spoilage. Thus, it is important to develop simple, portable and highly sensitive amine sensors for food safety. Here, detection of biogenic amines was investigated using a colorimetric sensor array fabricated from complexes of pH-sensitive dyes and nanomaterials. The Brønsted-Lowry acid-base reaction between the complex and BAs forms different amine salts. Variation in the alkalinity of these amines causes significant and distinct color changes in the pH-sensitive dyes. Eight common BAs can be differentiated from visual observation of difference maps alone. In conjunction with pattern recognition, the sensor array clearly differentiates eight gaseous amines with ≥92.6% accuracy and allows rapid quantification of trimethylamine (TMA) vapors with an impressive limit of detection (LOD) of 1.3 ppb. It also shows excellent chemical stability against changes in temperature and humidity. This sensor array for amines can be used as an alternative and promising tool for food monitoring.
研究领域:
食品安全
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化学传感
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2022
·
IF 6.212
Qian Wu,Feng Jiang,Guo Feng,Sanhai Wang,Lifeng Miao,Weihui Jiang,Jian Liang,Jianmin Liu
MgAl 2 O 4 /C composite was prepared via a facile low-temperature non-hydrolytic sol-gel (NHSG) route, using Mg powder, Al wire and isopropanol as raw materials. The influence of types of magnesium source and heat treatment temperature on the synthesis and adsorption properties were investigated, and the adsorption mechanism was also studied. The results showed that the amorphous MgAl 2 O 4 formed at < 600 °C, and it crystallized at 700 °C. No impurity phase appeared in the samples calcined at 700–1300 °C, which was attributed to MgAl 2 O 4 crystallized directly from Mg(Al(O i Pr) 4 ) 2 . The uniform-doped carbon in MgAl 2 O 4 /C composites came in-situ from the organic groups in Mg(Al(O i Pr) 4 ) 2 . MgAl 2 O 4 /C showed a superior adsorption capacity for Congo red (CR). The bimetallic alkoxides structure was favorable for high adsorption property, and the adsorption property of amorphous MgAl 2 O 4 /C was significantly superior to that of its crystalline counterpart. The adsorption kinetics data was fitted with the pseudo-second-order model, while the Langmuir isotherm model could well descript the adsorption isotherm behavior, and the maximum adsorption capacity for CR was 5690 mg/g. The high adsorption capacity was attributed to the Lewis acid-base reaction and the electrostatic interactions between the anionic dye CR and MgAl 2 O 4 /C surface as well as the in-situ carbon, and amorphous state.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2019
·Vol. 42
·期 18
·2993-3001
·
IF 2.516
Jiaying Xue,Xianbin Zhu,Xiangwei Wu,Taozhong Shi,Dong Zhang,Rimao Hua
A novel dispersive liquid-liquid microextraction that combines self-induced acid-base effervescent reaction and manual shaking, coupled with ultra high performance liquid chromatography with tandem mass spectrometry was developed for simultaneous determination of ten neonicotinoid insecticides and metabolites in orange juice. An innovative aspect of this method was the utilization of the acidity of the juice for a self-reaction between acidic components contained in the juice sample and added sodium carbonate which generated carbon dioxide bubbles in situ, accelerating the analytes transfer to the extractant of 1-undecanol. The total acid content of juice sample was measured to produce the maximum amount of bubbles with minimum usage of carbonate. Manual shaking was subsequently adopted and was proven to enhance the extraction efficiency. The factors affecting the performance, including the type and the amount of the carbon dioxide source and extractant, and ionic strength were optimized. Compared with conventional methods, this approach exhibited low limits of detection (0.001–0.1 µg/L), good recoveries (86.2–103.6%), high enrichment factors (25–50), and negligible matrix effects (−12.3–13.7%). The proposed method was demonstrated to provide a rapid, practical, and environmentally friendly procedure due to no acid reagent, toxic solvent, or external energy requirement, giving rise to potential application on other high acid-content matrices.
研究领域:
分析化学
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食品科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2023
·
IF 13.2
Weiguang Lv,Jin Zhang,Yunpeng Liu,Jiao Lin,Xiaohong Zheng,Wenyi Yan,Hongbin Cao,Yi Zhang,Zhi Sun
Selective metal recovery from spent lithium-ion batteries has attracted wide attention since a high recovery rate and minimized environmental impact can be expected. However, either high temperature or high chemical consumption in order to realize effective lithium recovery is required, as the cathode inherent with high physiochemical stability, especially when the cobalt content is high (e.g. LiCoO 2 ). Herein, we discover that Lewis acids in cathode scraps induce phase transition from LiCoO 2 to Co(CoO 2 ) 2 and Li + , thus realizing fully selective recovery of lithium in a mild environment. Since Lewis acids are produced from scraps, the chemical consumption is reduced. Meanwhile, relying on the mild phase transition caused by Lewis acids, the morphology of the waste are maintained in the Co(CoO 2 ) 2 products, resulting in a comparable electrochemical performance with commercial Co 3 O 4 anode materials. Consequently, a closed-loop route for recycling cathode scrap is established at mild conditions with low cost and environmental impact.
研究领域:
材料科学
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环境科学
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化工工程
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yao Ji,Zhiyuan Pan,Tiangang Ma,Ke Wang,Xiaoxian Zhao,Quan Jin
Hierarchical porous spindle-shaped MIL-88B (HPS-MIL-88B) with core-shelled structure was prepared by citric acid-assisted. The material exhibits open channels on its outer surface and a hierarchical internal cavity structure with meso-/macro-pores. The samples were then pretreated at 200 °C to form an oxide film , aiming to improve the conductivity of material. The as-prepared HPS-MIL-88B-6 h@Fe 2 O 3 material with core-shelled structure exhibits superior selectivity and high sensitivity to trimethylamine (TMA) at 200 °C (detection limit as low as 1 ppm) with fast response and excellent repeatability. The outstanding sensing performance was owing to the open and hierarchical porous that enhances the reaction between the target gas and the active sites of the material. In addition, the metal unsaturated active sites of MIL-88B (Lewis’s acid) can selectively undergo acid-base reactions with TMA (Lewis’s base), enhancing the generation of oxygen species and improving the selective adsorption capacity towards the target gas. This work provides a new path route for the application of MOF materials in sensors.
研究领域:
材料科学
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化学传感器
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纳米材料
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气体传感
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）