ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Yong Liu,Lungang Chen,Tiejun Wang,Qi Zhang,Chenguang Wang,Jinyue Yan,Longlong Ma
Lignocellulosic biomass is a renewable feedstock that has the potential to replace the diminishing fossil fuels. Herein, we reported the simultaneous conversion of cellulose, hemicellulose and lignin from raw biomass into gasoline alkanes (hexanes and pentanes) and monophenols and related hydrocarbons over layered LiTaMoO6 and Ru/C in aqueous phosphoric acid medium. Specifically, gasoline alkanes were directly yielded from the carbohydrate components, based on hemicellulose and cellulose, and the total yield could be up to 82.4%. Notably, the lignin fraction could also be transformed into monophenols, related alcohols and hydrocarbons by the one-pot reaction. It suggested that the hydrocracking of monophenol fraction could be performed in this catalytic system. The total yield of volatile products was 53% based on the lignin fraction. In this paper, the influences of phosphoric acid concentration, substrate ash and the amino acids derived from the biogenic impurities were investigated and different raw biomass substrates were tested. Furthermore, the catalysts could be reused for several runs to convert raw biomass without pretreatment.
研究领域:
能源生物学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 27
·1-12
·
IF 2.8
Zeng Shifan,Zhang Cong,Tian Haiming,Yao Guizhi,Shi Huan,Zhu Yong,Chi Shangpeng,Kan Xucai,Liu Xiansong
The magnetic powder Sm 2 Fe 17 N x has recently garnered considerable interest due to its competitive pricing. In this study, the preparation of Sm 2 Fe 17 N x magnetic powder by melt quenching and nitriding process was successfully completed. In order to obtain a higher coercivity, the particle size of the magnetic powder was reduced to a diameter of less than 2 μm through ball milling. It was observed that as the ball milling time was extended, the coercivity of the magnetic powder exhibited a decline that was premature in comparison to the expected results. Additionally, the presence of minute particles of magnetic powder may appear spontaneous combustion phenomenon. Accordingly, Sm 2 Fe 17 N x magnetic powder with high coercivity ( H cj = 842.8 kA/m) was prepared by phosphoric acid passivation process. Through XRD patterns, it was found that the phosphoric acid passivation process markedly enhanced the antioxidant capacity of the magnetic powder. Through SEM images, it is found that the fine magnetic powder exhibits a sheet structure and has strong shape anisotropy. The research indicate that the phosphoric acid passivation process is effective in enhancing the stability of Sm 2 Fe 17 N x magnetic powder and inhibiting the oxidation reaction of magnetic powder during use. This has a beneficial impact on the service life of permanent magnet devices in industrial production.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Lu Lv,Min Zhao,Yanan Liu,Yufei He,Dianqing Li
Alumina (Al 2 O 3 ) is widely used in the chemical industry as the catalyst and support due to its high specific surface area, abundant pore size distribution and chemical stability. However, the occurrence of hydration in water environment, result in outstanding decrease in specific surface area and collapse of pore structure. In this work, dodecyl phosphoric acid (PA) is used to modify the surface of Al 2 O 3 to obtain a series of hydrophobic material (Al 2 O 3 -PA). Based on XPS and NMR analysis, PA is chemically bonded on Al 2 O 3 to form P O Al bond. Furthermore, BET and WCA results display that Al 2 O 3 -1PA exhibits excellent the hydrophobicity and hydrothermal stability while maintains the pore structure. Take it as the substrate to support the Pd nanoparticles , the as-prepared Pd/Al 2 O 3 -PA shows the superior catalytic performance in the hydrogenation of phenol and anthraquinone relative to Pd/Al 2 O 3 , indicating the accessibility of Pd sites after PA modification. Especially, the significantly enhanced stability is also obtained in four cycles for aqueous phenol hydrogenation. This can be ascribed that the PA modification inhibits the aggregation of Pd nanoparticles and the products adhesion in the reaction process. The extension of PA coatings to monolithic catalysts could expand their current capabilities in industrial applications and warrants ongoing investigation.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Gang Cheng,Xin Zhou,Chongyu Du,Guotao Hu,Qian Lin,Hongyan Pan
The purpose of this study was to prepare a novel and efficient adsorbent for the removal of trace Pb(II) from phosphoric acid. Manganese oxide/sulfur-oxygen doped carbon nanotube composites (CNTs-S-O-Mn) were prepared from multi-walled carbon nanotubes modified with nitric acid, mercaptoacetic acid, acetic anhydride, concentrated sulfuric acid and potassium permanganate. Characterisation revealed that CNTs-S-O-Mn contained hydroxyl, sulphonate groups, MnO and Mn 3 O 4 . At 298 K, 15.362 mg·L -1 initial concentration of lead ions, and 18.4 % phosphoric acid concentration, the adsorption capacity of the composites for lead ions was 38.65 mg·g −1 , which was higher than that of the unmodified CNTs , 8.04 mg·g −1 . The adsorption kinetic data at 298 K conformed to the quasi-second-order kinetic equation, R 2 = 0.997; 298, adsorption isotherms at 308 and 318 K conformed to the Langmuir equation, R 2 = 0.990–––0.991. The adsorption capacity increased with decreasing phosphoric acid concentration. In this system, the adsorption is affected by a certain concentration of lead ions. Adsorption occurs via chemisorption and is exothermic. Sulfonic acid groups and hydroxyl groups on manganese oxides play an important role in the adsorption of Pb (II) through surface complexation with Pb (II). These results indicate that the removal of trace Pb (II) from phosphoric acid by modified carbon nanotubes is feasible, revealing a new use of carbon nanotubes for phosphoric acid purification.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Gang Zhang,Wenxia Ma,Yuqin Feng,Ming Yang,Zheng Fang,Yongsheng Yang,Weiyan Yin,Zehao Li
The development of rare earth adsorbents with high adsorption capacity, outstanding selectivity, and excellent reusability is important for the enrichment and recovery of rare earth elements. The adsorption of the rare earth ion Gd(III) by a phosphorylated polyacrylonitrile fiber was investigated. In this work, the adsorbent was synthesized by a simple and cost-effective grafting method using polyacrylonitrile (PAN) fibers as the substrates. The FTIR analysis, SEM, XPS, and TGA indicated the successful synthesis of polyacrylonitrile-phosphite (PAN-Phos) fibers. To evaluate the feasibility of PAN-Phos fibers as the potential adsorbents for Gd(III) removal, a series of adsorption experiments were conducted. The pseudo-second-order kinetic model better illustrated the adsorption of Gd(III) on PAN-Phos fibers, and equilibrium adsorption was achieved within 50 min; the maximum adsorption capacity was 120.9 mg·g–1. The PAN-Phos fibers also exhibited excellent reproducibility after four adsorption cycles. In addition, the results of various analyses indicated that the adsorption mechanism of Gd(III) on PAN-Phos fibers was mainly through the synergistic complexation of secondary amine and phosphoric acid groups. It provided a practicable way for the synthesis and preparation of rare earth adsorbent materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Ning Pan,Yongdong Jin,Xiaoqiang Wang,Xiaoping Hu,Fangting Chi,Hao Zou,Chuanqin Xia
Herein, we report a convenient method for the preparation of a self-assembled supramolecular material containing phosphoric acid (PM) choosing phytic acid and melamine as the two organic building blocks. The PM was chosen as an adsorbent for the first time for the fast adsorption and recovery of U(VI) from acidic aqueous media. The batch adsorption experiments showed that PM-9 possesses a very fast adsorption kinetic with the adsorption process for U(VI) from acidic water reaching equilibrium within 2 min. A considerable adsorption capacity of 1034.9 mg/g and an excellent selectivity 58.6% toward U(VI) in acidic aqueous solution were obtained. The adsorption capacity in dynamic column experiment was determined to be 251.0 mg g–1, with the recovery efficiency as high as 99.4% when using Na2CO3 as a stripping agent. The adsorption mechanism was probed by FT–IR, XRD, SEM, XRF, and XPS, implying the double bond oxygen atom of phosphoric acid and the nitrogen atom of amino group complexes with uranyl ions in the acidic media.
研究领域:
化学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 25
·15288-15301
·
IF 10.733
Xiaoxiao Zhang,Xudong Fu,Shoukun Yang,Yuanfang Zhang,Rong Zhang,Shengfei Hu,Xujin Bao,Feng Zhao,Xiao Li,Qingting Liu
For the application of proton exchange membrane fuel cells (PEMFCs) in a wide temperature range, an ionogel incorporated into poly(2,5-benzimidazole) (ABPBI) membranes with low phosphoric acid doping levels was designed. The natural sepiolite was first acid-treated to obtain one-dimensional silicon nanorods (SNRs) with a large specific surface area and a hierarchical porous structure. The SNRs were then filled with imidazolium ionic liquid (IL) to prepare IL@SNR ionogels. Analysis of related spectra and thermal behavior verified that the IL molecules were confined in the inner channels of SNRs. The as-prepared IL@SNRs were embedded in the ABPBI to form composite membranes (ABPBI/IL@SNRs) via in situ synthesis. By immobilizing proton conductors, the ABPBI/IL@SNR composite membranes markedly improved proton conductivity with low phosphoric acid doping levels in a wide temperature range. A single-cell based on 5 wt% IL@SNRs embedded in a composite membrane achieved a maximum power density of 0.15 and 0.28 W cm−2 at 80 °C and 180 °C, respectively, with 0% RH. The proton conductivities were comparable to those of Nafion-based PEMFCs under the same temperature and humidity conditions and competed with those of reported polybenzimidazole–inorganic composite membrane-based PEMFCs at high temperatures. By using a facile method to prepare nanostructured fillers, the strategy of avoiding proton carrier wastage can be potentially used in the production of high-performance membranes for PEMFCs.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 48
·2411012
·
IF 27.4
Yong-Hui Song,Xiao-Lin Tai,Guan-Jie Ding,Zhen-Yu Ma,Jing-Ming Hao,Kuang-Hui Song,Ya-Lan Hu,Shikuo Li,Yue Lin,Hong-Bin Yao
Mixed halide 3D perovskites are promising for bright, efficient, and wide-color gamut light-emitting diodes (LEDs) due to their excellent carrier transport, high luminescence, and easily tunable bandgaps. However, serious halide ion migration inside mixed halide 3D perovskite results in poor operational and spectral stability of the as-fabricated LEDs. Here, a hetero-nucleation crystallization strategy is reported to grow [111]-orientation preferred mixed halide 3D perovskite CsPbI 3-x Br x thin films for stable pure red LEDs. This hetero-nucleation crystallization is enabled by the addition of phosphoric acid (H 3 PO 4 ) complexation, which promotes the growth of small perovskite grains into large grains with uniform [111]-orientation. The obtained [111]-orientation preferred film exhibits excellent stability under light or electric field stimulus as revealed by model analysis and experimental results compared to that of [001]-orientation preferred film. Thus, based on the [111]-orientation preferred film, the fabricated LED exhibits an external quantum efficiency of 22.8%, a maximum brightness of 12 000 cd m −2 , and a half-life time of 4080 min under 1.5 mA cm −2 . More importantly, the electroluminescence spectrum of the device remains stable during the continuous operation of 4080 min, showcasing the significant spectral stability improvement enabled by the hetero-nucleation induced [111]-orientation strategy.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Yongchao Sun,Zeyuan Gao,Lu Bai,Tianyou Li,Fangxu Fan,Fake Sun,Yijun Liu,Jianyu Guan,Gaohong He,Canghai Ma
Membrane technology holds the potential to significantly improve energy-efficient industrial processes, fostering a more sustainable green economy. However, overcoming the challenges of gas permeability-selectivity tradeoffs and CO 2 induced plasticization in gas separation materials remains a critical focus. This study presents a functionalization method for Trӧger's base (TB) based polymers by modifying them with phosphoric acid to create hydrogen bonds within the membrane structure. This approach enables ultra-high gas selectivity for multiple gas pairs, including H 2 /CH 4 , H 2 /N 2 , and O 2 /N 2 . The crosslinked membranes display H 2 and O 2 permeability of 248.0 and 27.9 Barrer, respectively, with H 2 /CH 4 , H 2 /N 2 , and O 2 /N 2 selectivity of 202.1, 115.7 and 10.0, respectively, exceeding the 2008 Robeson upper bounds for these gas pairs. Moreover, the crosslinked membranes demonstrate excellent anti-plasticization properties, withstanding pressures up to 600 psi in high-pressure CO 2 feed tests. These results suggest that the hydrogen bonds formed between the TB polymer and phosphoric acid in the membranes effectively mitigate polymer chain swelling. This design approach presents a promising pathway to developing membrane materials with enhanced performance for energy-efficient gas separation processes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 47
·29527-29536
·
IF 3.361
Lian Sun,Quanchao Gu,Honglei Wang,Jinshan Yu,Xingui Zhou
A high-temperature proton exchange membrane was fabricated based on polyvinylidene fluoride (PVDF) and polyvinylpyrrolidone (PVP) blend polymer nanofibers. Using electrospinning method, abundant small ionic clusters can be formed and agglomerated on membrane surface, which would facilitate the proton conductivity. To further enhance the conductivity, phosphoric acid (PA) retention as well as mechanical strength, sulfamic acid (SA)-doped metal–organic framework MIL-101 was incorporated into PVP-PVDF blend nanofiber membranes. As a result, the anhydrous proton conductivity of the composite SA/MIL101@PVP-PVDF membrane reached 0.237 S cm−1 at 160 °C at a moderate acid doping level (ADL) of 12.7. The construction of long-range conducting network by electrospinning method combined with hot-pressing and the synergistic effect between PVP-PVDF, SA/MIL-101 and PA all contribute to the proton conducting behaviors of this composite membrane.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yiming Yao,Yue Meng,Hongwen Sun
Polyfluoroalkyl phosphoric acid diesters (diPAPs) have been widely and increasingly detected in various environmental mediums. The degradation of diPAPs brings perfluoroalkyl carboxylic acids (PFCAs) concerned of adverse health effects. DiPAPs mainly occur in particulate matter in ambient air and their photo-degradation behaviors have not been investigated. In this study, heterogeneous photo-degradation of 6:2 diPAP was studied on four model mineral components in ambient dust. 6:2 diPAP was found to undergo a fast degradation on titanium dioxide (TiO 2 ) particles as well as on artificial mineral dust containing TiO 2 (2.67% in mass) to produce C5–C7 PFCAs and other intermediates. Based on monitored intermediates and further degradation tests on important intermediates, thermodynamic calculation of energy barrier and Gibbs Free Energy was used to explain the observed degradation patterns and accordingly the degradation pathways of diPAPs were proposed. The increase in relative humidity promotes the production of hydroxyl radicals , which enhances the hydrolysis of 6:2 mono- and di-PAPs and the yield of C5 and C7 PFCAs. Oxygen is critical for radical formation, which bypasses the production of fluorotelomer carboxylic acid . Results of this study for the first time demonstrate that diPAP may account for additional PFCA sources in both indoor and outdoor environments and the heterogeneous degradation pathways were different from those of volatile fluorotelomer alcohols.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yongdie Zhao,Xiaohao Liu,Rui Diao,Dongxu Yan,Fenglei Qi,Peiyong Ma
Selective hydrogenation of fatty acids is an important method for the preparation of long-chain alkanes and fatty alcohols. Herein, a series of bimetallic catalysts with different Fe/Co ratios were prepared by using phosphoric acid-activated biochar as a support. The anchoring effect of P-containing functional groups in the support greatly improves the sintering resistance of the metals. The conversion pathway of stearic acid (SA) can be regulated by controlling Fe doping and the reduction temperature. The reduction of Fe1Co3/PAC at 400 °C can selectively regulate the hydrodeoxygenation pathway of SA. At 250 °C and 4 MPa, SA was almost completely converted to long-chain alkanes. Mechanism study shows that Fe doping increases the hydrogenation site CoO and dehydration site Fe–O–P in catalysts. However, by further increasing the reduction temperature, the metal phosphides formed in the catalyst can significantly enhance the dehydrogenation of octadecanol and decarbonylation of octadecaldehyde.
研究领域:
催化化学
·
可再生能源
·
材料科学
✓ 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）