JOURNAL OF ORGANIC CHEMISTRY
·
2022
·
IF 4.198
Jun Xu,Chao Peng,Bolin Yao,Hua-Jian Xu,Qiang Xie
This report describes a method for the deoxyfluorination of alcohols with KF as the fluorine source via in situ generation of highly active CF3SO2F. Diverse functionalities, including halogen, nitro, ketone, ester, alkene, and alkyne, are well tolerated. Mild conditions, a short reaction time, and a wide substrate scope make this method an excellent choice for the construction of C–F bonds.
研究领域:
有机化学
·
合成化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Bin Li,Ting Zhang,Zhaoguang Yang
Response surface methodology was employed to investigate the effects of nitrogen ( X 1 ), phosphorus ( X 2 ), and glucose ( X 3 ) on arsenic removal by fungal-algal pellets. X 1 , X 3 , and X 1 X 3 had significant effects. Arsenic accumulation and transformation were compared among Chlorella vulgaris , Aspergillus oryzae , and fungal-algal pellets under different arsenate and phosphorus concentrations. Fungal-algal pellets had the highest removal rate and was best able to accumulate arsenate in all treatments. The reduction of arsenate to arsenite was found in all tested organisms, while arsenic methylation was only identified in C . vulgaris . The biomass of fungal-algal pellets was not inhibited by arsenate. SEM micrographs showed that arsenic led to a change in mycelial structure from compact to loose pellets. FT-IR spectra showed that four functional groups might be involved in arsenate adsorption. Arsenic tolerance and accumulation in fungal-algal pellets opens the way to its potential application in the remediation of arsenic from contaminated water.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Zheng Wei,Zhang Peigen,Tian Wubian,Qin Xia,Zhang Yamei,Sun ZhengMing
To modify the adsorption performance of Ti 3 C 2 T x MXene , we report a facile approach to expand the interlayer spacing of Ti 3 C 2 T x and to tune its surface functional groups by hot alkaline solution treatment. In the treatment, the interlayer spacing of Ti 3 C 2 T x MXene is increased by up to 29% by LiOH, and the surface functional groups are tuned by converting -F to -OH. Among the MXenes, LiOH-Ti 3 C 2 T x and NaOH-Ti 3 C 2 T x can faster adsorb methylene blue (MB) than other MXene adsorbents; NaOH-Ti 3 C 2 T x possesses the highest adsorption capacity (189 mg/g) for MB, which can be ascribed to the cooperation of surface adsorption and intercalation adsorption. The experimental data suggest that the enhanced adsorption toward cationic dyes can be best described by a Langmuir isotherm.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Qin Zhang,Zhongsheng Chen,Jiangang Li,Xiancai He,Wei Peng,Chunpei Yan,Guolin Huang
Nuclear energy is considered to be a clean, low-carbon, efficient and sustainable source of energy, which is used in a great variety of fields. However, the generation of a large quantity of wastewater containing uranium has posed a potential threat to our human well-being and ecological environment. Efficient separation of radioactive U(VI) from uranium-bearing wastewater is of great importance for humanity. Herein, a novel adsorbent UiO-66-NH 2 @phos-PDA(abbr. U6N@phos-PDA) was prepared by using phosphate and UiO-66-NH 2 encapsulated by PDA. The effects of various conditions such as solution pH, contact time and U(VI) concentration on the U(VI) adsorption process were explored by batch experiments. The kinetic study revealed that the adsorption equilibrium time of U(VI) by U6N@phos-PDA was 150 min, and the adsorption process adhered to the pseudo-second-order kinetic model, with chemisorption being the dominant mechanism. At 298 K, U6N@phos-PDA was able to adsorb U(VI) up to 423.23 mg/g. The Langmuir isotherm model describes the adsorption behavior, which was dominated by adsorption on the surface monolayer. Thermodynamic analysis indicated that U(VI) adsorption by U6N@phos-PDA is a spontaneous endothermic process. Additionally, U6N@phos-PDA exhibited excellent selectivity for U(VI) adsorption in the presence of other metal ions and can be reused effectively for at least five cycles. The FT-IR and XPS characterization analyses demonstrate that the phosphate and amino functional groups of U6N@phos-PDA are crucial for ion exchange and complexation with U(VI). Therefore, U6N@phos-PDA shows promising potential for the separation of U(VI).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhaorui Zhang,Jiahao Liu,Haiying Du,Xufei Zhao,Haoming Sun,Minghui Yang,Jinkui Chu
A surface functional group modulation method was used to regulate the NO 2 sensing performance of the Ti 3 C 2 T x sensor. The monolayer Ti 3 C 2 T x MXene was synthesized from Ti 3 AlC 2 (MAX phase) by hydrofluoric acid (HF) etching. Ar/O 2 hybrid plasma treatment was used to regulate the ratio of hydroxyl and fluorine functional groups (OH/ F) in the Ti 3 C 2 T x surface structure. Room-temperature (RH) NO 2 sensor based on modified Ti 3 C 2 T x was fabricated by the dip coating method. The modified Ti 3 C 2 T x sensor has a higher gas response (45.31 %) to 50 ppm NO 2 compared with the untreated Ti 3 C 2 T x sensor which shows more excellent sensitivity and linearity with the NO 2 concentration of 5–50 ppm. It is due to that the presence of the hydroxyl potential on the Ti 3 C 2 T x surface well amplifies the electronic surface activity of Ti 3 C 2 T x . Concurrently, the modified electronic structure augments the adsorption propensity of Ti 3 C 2 T x for O 2 (2.26 |eV|) and NO 2 (3.24 |eV|), thereby improving the NO 2 sensing capability of the Ti 3 C 2 T x sensor. These results demonstrate that Ti 3 C 2 T x with a high ratio of OH/ F functional groups has great potential in developing high-performance room temperature NO 2 sensors.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Binliang Wang,Yingying Li,Junli Zheng,Yiwei Hu,Xiaojun Wang,Baowei Hu
The utilization of Microcystis biomass is an urgent issue in the mitigation of cyanobacterial bloom. In this study, Microcystis -derived biochar (MB) and Fe 3 O 4 -modified biochar (Fe 3 O 4 /MB) were fabricated for the U(VI) elimination. The results showed that U(VI) sorption process by either MB or Fe 3 O 4 /MB was pH-dependent and ionic strength-independent. The maximum sorption capacity of MB was higher than that of Fe 3 O 4 /MB. According to the analysis of X-ray photoelectron spectroscopy, U(VI) sorption on both MB and Fe 3 O 4 /MB was mainly ascribed to the surface complexation between U(VI) and oxygen-containing functional groups on the surface of MB. Fe 3 O 4 particles on the surface of MB didn’t provide extra active sites for the sorption of U(VI), but it enabled the adsorbent to be magnetically separated. Five consecutive sorption/desorption cycles verified the good reusability of Fe 3 O 4 /MB in this study. Therefore, the investigation is not only meaningful for the utilization of nuisance biomass from cyanobacterial blooms, but also provides novel adsorbents for the U(VI) removal from aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
FUEL
·
2018
·
IF 4.908
Jingai Shao,Junjie Zhang,Xiong Zhang,Ye Feng,Han Zhang,Shihong Zhang,Hanping Chen
To enhance the SO 2 adsorption of biochar, CO 2 activation and impregnation with methyldiethanolamine (MDEA) was simultaneously employed to improve its physicochemical characteristics. Furthermore, the effects of the pore structure and nitrogen functionality on SO 2 adsorption were also explored. The results show that after CO 2 activation, the specific surface area of biochar increased from 56.91 m 2 /g to 755.35 m 2 /g, while this figure dropped to 25.54 m 2 /g or even lower after impregnation with MDEA. Although the pore structure of activated biochar was destroyed, the surface nitrogen content of the nitrogen-enriched biochar (with 10% MDEA impregnation) increased from 1.46% to its highest level (7.20%); moreover, as indicated by Fourier Transform Infrared (FTIR) spectroscopy, the nitrogen functional groups introduced on the surface of the nitrogen-enriched biochar were mainly C-N. After 10% MDEA impregnation, the maximum SO 2 adsorption capacity increased from 57.8 mg/g to 156.2 mg/g. Changes to physical and chemical properties in the nitrogen-enriched biochar indicate that the nitrogen functional groups on the surface are more important than the pore structure for SO 2 adsorption at 393 K, and that the dominant nitrogen species are quaternary nitrogen.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2022
·
IF 4.198
Lei Xu,Zheng Dong,Qi Zhang,Ning Deng,Shi-Yu Li,Hua-Jian Xu
The versions of Miyaura borylation and protoboration of alkynes catalyzed by low loadings of palladium (400 mol ppm = 0.04 mol %) have been developed. These transformations have a broad substrate scope, good functional-group compatibility, and gram-scale synthetic ability.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Xiangyu Wang,Zhengjian Hou,Mingwei Zhao,Xuhao Wang,Peng Liu,Xufeng Lin,Zizhao Wang,Zhenfeng Ma,Caili Dai
Clean fracturing fluids (CFFs) hold great potential for the development of unconventional reservoirs due to their characteristics (e.g., fracturing-oil expulsion integration and low formation damage). Organic salts, as adjuvants, play a significant role in regulating the performance of CFFs. In this work, four CFFs containing different organic salts were prepared to investigate the impact of functional groups in organic salts on the CFF performance. Results show that the functional groups markedly influence the rheological properties, temperature resistance and drag reduction performances of CFFs through inducing the micelle formation and thus enhancing the micelle network strength. Sodium 4-vinylbenzenesulfonate (SV) with vinyl endowed the CFF with the stronger micelle network. Furthermore, the functional groups were found to impact the adsorption of surfactants at interface, which affects the oil–water interfacial tensions and regulates the spontaneous imbibition performance of CFFs. SV enables a higher imbibition efficiency of 25.6 % after 90 h. Density functional theory (DFT) calculation results confirmed that the functional groups of salts are capable of manipulating the interactions between salt anions and surfactant, ultimately determining the CFF performance. This work provides guidance for the selection of salt additives to improve the CFF performance.
研究领域:
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Building Engineering
·
2024
·
IF 6.7
Dezhi Zhao,Hexiang Wang,Qingxin Zhao,Jinghui Zhang,Lili Yuan
Polypropylene (PP) fiber is widely used for reinforcing cement matrix to improve its cracking resistance , but the poor interaction between two materials caused localized cracks along the fiber thus adverse effect on the fiber reinforced composites . Thus, novel methods for strengthening the fiber-cement matrix interface were proposed in this study. Amidoxime and amine functional groups were successfully grafted onto PP fiber surface through a two-step chelating procedure. XPS , FTIR, iGC-SEA and TG were employed to characterize the modified fibers, and the results verified that the surface treatment significantly improved the surface roughness, specific surface area, hydrophily and thermostability of PP fiber. Moreover, single fiber pullout, uniaxial tensile and three-point bending were conducted to assess the efficiency of surface treatment in enhancing the bonding between fiber and cement matrix, as well as the tensile and flexural strength of composites incorporating PP fibers. The bonding strength was increased by 84.15%–90.08 % and the flexural strength at 28 days was increased by 23.7%–26.4 %. The change in PP fiber surface led to densified fiber-cement matrix ITZ, enhanced chemical bonding and mechanical interlocking thus stronger interaction between fiber and cement matrix. Overall, the proposed surface treatment method is of great potential to be used in producing high performance concrete due to its easy of application and high efficiency.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Rui Yang,Mengchao Han,Boran Hao,Kan Zhang
A novel fully biobased tri-furan functional bis-benzoxazine resin has been synthesized using guaiacol , furfural, furfurylamine and paraformaldehyde as raw materials via a two-step reaction approach. The detailed chemical structure of this newly obtained bis-benzoxazine monomer has been identified by NMR and FT-IR spectroscopies and elemental analysis. In addition, another bio-based benzoxazine monomer has also been synthesized based on the Mannich condensation of guaiacol, furfurylamine and paraformaldehyde for comparison. The polymerization behaviors of benzoxazines are investigated by DSC and in situ FT-IR, and the thermal and fire-related performances of resulting thermosets are investigated by TGA and micro-scale combustion calorimetry (MCC), respectively. Notably, the corresponding polybenzoxazine derived from the newly developed tri-furan functional bis-benzoxazine shows very excellent thermal stability with a T g of 290 °C and a T d10 (the temperature at a weight loss of 10%) of 375 °C in nitrogen atmosphere. Moreover, a non-ignitable polybenzoxazine has also been achieved as shown by the very low heat release capacity (30.4 J g −1 K −1 ) and total heat release value (5.8 kJ/g), making this bio-based thermosetting resin a promising material for high-performance applications.
研究领域:
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHESIS-STUTTGART
·
2013
·Vol. 45
·期 24
·3349-3354
·
IF 2.5
Haidong Wei,Tianbin Li,Yue Zhou,Lihong Zhou,Qingle Zeng
Alkyl halides, including heteroarylmethyl and arylmethyl halides, bromoacetate, and cinnamyl bromide, are readily prepared via halogenation from basic raw materials, even using green processes. It is essential to replace their downstream products with them to prepare medicinally important heterocycles quinazolin-4(3H)-ones. Copper(I) bromide catalyzed domino reaction of alkyl halides and anthranilamides under air affords 2-substituted quinazolin-4(3H)-ones in good to excellent yields and with wide functional group tolerance. A mechanism for a copper(I) bromide involved organometal-catalyzed reaction via a four-step domino reaction is proposed.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）