MOLECULES
·
2024
·Vol. 29
·期 8
·1809
·
IF 4.2
Yuhong Zhao,Qi Zhang,Zhuhua Gong,Wenlin Zhang,Yun Ren,Qiang Li,Hongjia Lu,Qinhong Liao,Zexiong Chen,Jianmin Tang
In this study, we prepared high-nitrogen self-doped porous carbons (NPC1 and NPC2) derived from the pruned branches and seeds ofZanthoxylum bungeanumusing a simple one-step method. NPC1 and NPC2 exhibited elevated nitrogen contents of 3.56% and 4.22%, respectively, along with rich porous structures, high specific surface areas of 1492.9 and 1712.7 m2g−1and abundant surface groups. Notably, both NPC1 and NPC2 demonstrated remarkable adsorption abilities for the pollutant methylene blue (MB), with maximum monolayer adsorption capacities of 568.18 and 581.40 mg g−1, respectively. The adsorption kinetics followed the pseudo-second-order kinetics and the adsorption isotherms conformed to the Langmuir isotherm model. The adsorption mechanism primarily relied on the hierarchical pore structures of NPC1 and NPC2 and their diverse strong interactions with MB molecules. This study offers a new approach for the cost-effective design of nitrogen self-doped porous carbons, facilitating the efficient removal of MB from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ENERGY
·
2024
·
IF 9
Tao Lu,Zhiwen Ma,Yali Pan,Zhenyu Wu,Yupeng Yuan,Yingqiang Sun
Hydrothermal liquefaction (HTL) of microalgae for bio-oil production is a promising strategy to avoid extensive fossil fuel utilization, while tandem amidation and Maillard reactions during hydrolysis of cellular compounds unavoidably result in formation of nitrogen containing (N-containing) compounds, reducing quality of bio-oil. Accordingly, VO 4 3− intercalated Cu–Fe layered double oxides named as Cu 2 Fe-VO 4 -LDO is firstly synthesized to both catalyze hydrolysis of cellular compounds and block N-containing compounds formation. The results indicate Cu 2 Fe-VO 4 -LDO can improve bio-oil yield from 19.32 to 20.32 wt%, with decrease of N/C ratio from 0.70 of control to 0.67 of experimental group, and increase of H/C ratio from 0.129 to 0.132. The insert of VO 4 3− provides more strong-acid sites, which are beneficial to hydrolysis of cellular compounds. Meanwhile, more strong-base sites of Cu 2 Fe-VO 4 -LDO promote decarboxylation of fatty acids and removing amino-group of amino acids, subsequently improve production of alkanes. Furthermore, the reversible oxidation of VO 4 3− promotes oxidation of reducing sugars, blocking tandem amidation and Maillard reaction between intermedia of hydrolyzed lipids, carbohydrates, and proteins. This work reports a methodology for synthesis of Cu 2 Fe-VO 4 -LDO with strong acid-base sites and reversible oxidize interlayer sites, providing a strategy to simultaneously improve bio-oil yield and reduce its N/C ratio.
研究领域:
能源生物学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Qiulian Liu,Weihua Li,Xiaolong Qiao,Haiguang Zhao
Colloidal carbon dots (C-dots) have excellent optical properties and they have been widely used for various types of applications. Compared to the C-dots prepared using chemicals, the Biomass-derived C-dots have attracted a great of attention because of their environmental friendliness and biocompatibility. However, currently obtained C-dots using biomass have low quantum yield. In this work, we demonstrated an efficient precursor of Magnolia flower for synthesizing high-quantum yield C-dots via hydrothermal approach. High performance liquid chromatography and Bradford assay were used to analyze the compositions of the Magnolia flower, which determine the quality of the C-dots. The typical emission bands of the as-prepared C-dots cover from 400 to 550 nm at different excitation wavelengths. The C-dots synthesized using violet Magnolia flower have the QY as high as 11.9%, which is higher than that of 10.4% (white Magnolia flower), because the violet color gives the higher content of the N. The as-obtained C-dots have excitation-dependent color and high quantum yield, showing a great potential for the use of the anti-counterfeiting system.
研究领域:
材料科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Xiaokai Xu,Lifeng Cai,Guangqi Hu,Luoqi Mo,Yihao Zheng,Chaofan Hu,Bingfu Lei,Xuejie Zhang,Yingliang Liu,Jianle Zhuang
As a new type of carbon nanomaterial , carbon dots (CDs) have attracted more and more attention due to their excellent properties. Here, we developed a simple, green and environmentally friendly method for preparing red-emissive CDs from spinach. The emission color of the CDs under UV light changed from red luminescence to green luminescence after one to four weeks. This was due to the change of the aggregated molecules on the surface of CDs. It was demonstrated that the nitrogen content of the CDs gradually decreased with the increase of time, since CDs combined with oxygen to form aggregates to eliminate excess nitrogen. It was further found that CDs showed the increase intensity of the emission in 500 nm wavelength and decrease intensity of the emission in 665 nm wavelength, which could be attributed to their respective emission from different molecular structures. Compared with the CDs stored for one week, the agglomeration of the CDs particles after four weeks was obvious, indicating that its light stability depended on the agglomeration structure of CDs. Due to their special properties, the CDs could be used for visual detection of time.
研究领域:
材料科学
·
环境科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Chuxuan Zhang,Jianhui Zeng,Luqiu Lin,Yang Peng,Xiaomin Li,Xun Gong
As the representative of the 3rd generation feedstock of biodiesel , microalgae show extraordinary advantages for energy demands. Magnetic separation is a proven and effective method for microalgae harvesting. This study aims to investigate the effect of unrecovered magnetite-based nanoparticles (Fe 3 O 4 NPs) after microalgae harvesting on the bio-oil quality, especially nitrogen content in the subsequent production. Co-liquefaction of Chlorella Vulgaris mixed with three residual amounts (1 wt%, 5 wt%, and 10 wt% of microalgae addition) Fe 3 O 4 NPs in ethanol at 220 and 260 °C were performed. Ethanol can provide hydrogen in situ during liquefaction , and the catalytic activity of Fe 3 O 4 to hydrogenation reaction enhances the yield and quality of bio-oil. At 260 °C and 5 wt% NPs dosage, the bio-oil yield can reach up to 79.71%. The addition of NPs reduces the relative N content of bio-oil by more than 16.90%. GC/MS analysis shows that the nitrogen heterocyclic compounds are significantly reduced about 60%; instead, hydrocarbons are increased in the bio-oil. It implies that Fe 3 O 4 NPs are beneficial to the denitrogenation of bio-oil during microalgae liquefaction in ethanol.
研究领域:
能源生物学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2023
·
IF 3.2
Faqir Yahya,Chai Yunlong,Jakhar Ali Murad,Wu Sanmei,Luo Tong,Liao Shiyu,Kalhoro Mohammad Talib,Li Linqiu,Kaleri Abdul Rasheed,Tan Chengjia,Ma Jiahua,Zhang Qiling,Cao Shidong,Adeel Mohammad
The present study was undertaken with the aim of evaluating the ginger essential oil potential and its urea-loading efficacy in the preparation of control-releasing chitosan microspheres. The ginger oil for hydro-distillation was extracted by applying Clevenger apparatus, chemical composition was characterized by FTIR, and the GC-MS was used to identify the oil compounds. Urea-loaded chitosan microsphere formulations were formulated through modified emulsification and cross-linking procedure. The various factors and levels related to preparation of urea-loaded chitosan microspheres were evaluated using response surface test. The present study was also an effort to observe the yield and content of nitrogen. Additionally, FTIR and SEM were applied to characterize the microspheres. The results show the yield of ginger oil as 6.0%. Main compounds identified by GC-MS were gingerol, decanal, isoshogaol, octanal, and others. FTIR also showed that some typical bands appeared in ginger oil. The nitrogen content % in urea-loaded microspheres showed a significantly higher value in proportion to higher oil volume and cross-linking. However, by decreasing the amount of urea and enhancing acetic acid, nitrogen content was decreased. The lower oil concentrations improved the microsphere surface structure and morphology. Response surface analysis showed that the optimum preparation conditions are as follows: 2.094% of Span 80, 2.302% of acetic acid, and cross-linking agent ratio of formaldehyde to glutaraldehyde 1:8.15. Under these conditions, the theoretical value of nitrogen content of urea-loaded chitosan microspheres was 4.683%. According to release test, the urea diffused uniformly in the microspheres after 48 h. It is concluded that the use of ginger oil in control release of fertilizers is the right option in the formulations of control-releasing micro-fertilizers.
研究领域:
农业科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Xiancheng Ma,Liqing Li,Shaobin Wang,Mingming Lu,Hailong Li,Weiwu Ma,Tim C. Keener
A porous carbon (ZC) was prepared at 900 °C using zeolitic imidazolate framework-8 (ZIF-8) as a solid template for CO 2 adsorption. The ZC was further treated by ammonia functionalization to improve CO 2 uptake. The textural and surface characteristics of ZC samples were determined by X-ray diffraction (XRD), N 2 adsorption, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). It was revealed that ammonia treatment at 600 °C considerably enhanced the specific surface area and N-content of ZC. However, the pyrrolic-N group was decreased, yet the pyridinic-N group was increased with an increased temperature. The pyrrolic-N significantly enhanced CO 2 adsorption. The ammonia treatment, on the one hand, increases the alkalinity of ZC sample and the base–acid interaction between N-containing functional groups with CO 2 . On the other hand, the ammonia treatment increased pyrrolic-N group (NH) into carbon surface facilitating the hydrogen-bonding interactions between proton of pyrrolic-N and CO 2 molecules.
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuangang Xu,Lujia Ding,Feng Yang,Dongxue Li,Pengcheng Wang,Qiuhan Lin,Ming Lu
A high energy cyclo -pentazolate ( cyclo -N 5 − ) salt with 90.98 % nitrogen content, LiN 5 , was synthesized by a simple metathesis reaction of AgN 5 and LiCl in deionized water . It was characterized by 15 N nuclear magnetic resonance, infrared and Raman spectroscopy , elemental analysis, thermogravimetry-mass (TG-MS) spectrometry, and differential scanning calorimetry . Besides, its trihydrate (LiN 5 ·3H 2 O) and anhydrous zeolitic architecture (LPF, lithium-pentazolate framework) structures were confirmed by single-crystal X-ray diffraction. LiN 5 achieved stability in air and under ambient conditions. It starts to decompose when heated to 133 °C (onset) under Ar 2 flow. Its relatively high density (1.75 g cm −3 ), impact and friction sensitivity (IS = 3 J; FS = 20 N), and calculated high heat of formation (3.44 kJ g −1 ), combined with its theorical superior detonation velocity and pressure ( D = 11362 m s −1 , P = 40.9 GPa), endow LiN 5 with potential as an environmentally primary explosive.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
An Wei,Shunxiang Wang,Xulan Lu,Yongjin Zou,Cuili Xiang,Fen Xu,Lixian Sun,Yunhao Lu
As a commonly used material, wood's inherent flammability poses a significant fire safety hazard to people, and it is necessary to improve the flame-retardant performance of wood. This study prepared a novel lignin-based intumescent flame-retardant (PGL) using phosphorus-rich phytic acid, nitrogen-rich guanazole, and carbon-rich lignin as raw materials. Subsequently, PGL was infiltrated into the urea-formaldehyde resin as a flame-retardant component, and a series of PGL-modified urea-formaldehyde resin wood coatings (PGLUF) were prepared. The wood coated with PGLUF exhibited high flame retardancy and passed the UL-94 V-0 level test with a limit of oxygen index (LOI) of 36.5 %. The total heat release (THR) and peak heat release rate (PHRR) were reduced by 92.73 % and 93.58 %, respectively, compared to pure wood. Moreover, when the PGL content was 3 wt.%, the PGLUF could achieve comparable flame retardancy to the coating containing 5 wt.% commercial flame-retardant (triphenyl phosphate, TPP). PGL also exhibited a plasticizing effect on the coatings. The impact strength of PGLUF-coated wood increased with the increase of PGL content. PGL can simultaneously enhance the flame retardancy and mechanical properties of materials, and the preparation process is green and safe. Therefore, the PGL shows excellent potential in practical applications.
研究领域:
材料科学
·
林业工程
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2020
·Vol. 10
·期 3
·356
·
IF 2.117
Yongjie Liu,Yue Wang,Zhixiong You,Xuewei Lv
The steel micro-alloyed with ferrovanadium nitride has extremely superior properties that make it widely utilized in structural components, construction and aircraft. The conventional methods for synthesizing ferrovanadium nitride include nitridation of pure ferrovanadium alloy or carbothermal nitridation of metallic oxides, using nitrogen or ammonia gas as nitrogen sources. In this study, ferrovanadium nitride (FeV45N) was prepared by direct reduction and nitridation of the corresponding metal oxides with ammonia as the reductant and nitrogen source. This method avoids the introduction of other impurity elements, except the negligible trace elements accompanied with the raw materials. The thermodynamics of the reduction and nitridation process were initially analyzed. During the subsequent ammonia reduction process, the FeV45N powders were successfully obtained at 1273 K for 6 h. The obtained powders were pressed into cylindrical briquettes by hot pressing (HP) at 1473 K for 1 h in vacuum. In the investigation, the X-ray diffraction and morphological analysis of the products was also carried out, and the reaction mechanisms were discussed in detail. The nitrogen content of the final product can reach 11.85 wt. %, and the residual oxygen content can be reduced to 0.25 wt. %. By sintering, the density of the alloy can reach 5.92 g/cm3.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Gui-Ying Zhuge,Wei-De Zhang
The photocatalytic activity of graphitic carbon nitride (CN) is mainly restricted by its high recombination rate of charge carriers and narrow visible light absorption. In the present work, nitrogen-deficient CN (NDCCN) nanosheets with high crystallinity were synthesized using molten salt (NaLiCO 3 ) as an etching agent and high-temperature solvent. The electronic structure and energy band levels of the obtained NDCCN are optimized to extend its optical absorption and enhance separation efficiency of photo-generated charge carriers. With these changes, NDCCN displays high photocatalytic activity for hydrogen evolution under visible light illumination (111 μmol h −1 ), which is 4.6 times of that over pristine CN. This finding opens up a new window to simultaneously decrease nitrogen composition and increase crystallinity of carbon nitride for higher solar-light-driven hydrogen production efficiency.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of CO2 Utilization
·
2021
·
IF 7.132
Jinsong Shi,Hongmin Cui,Jianguo Xu,Nanfu Yan,Chao Zhang,Shengyong You
Porous carbon with specifically designed structure as CO 2 adsorbent is a very attractive and interesting research topic. In this study, we presented the synthesis and CO 2 adsorption of flower shaped porous carbons. Flower-like hydrochar derived from the hydrothermal reaction of glucose, cobalt sulfate, and hexamethylenetetramine was used as the precursor, which was converted to carbon flower during CO 2 activation. The flowers had hierarchically macro-meso-microporous structure. Interspaces and voids were formed by assembly of the petals, and the petals were distributed with pores of different scales. The formation mechanism of, and influences of various synthesis parameters on the flower shape were studied and analyzed. The carbon flowers exhibited surface area of 422−691 m 2 /g, and very high nitrogen content of 9.31–11.91 wt%. CO 2 adsorption performances of the carbon flowers were also studied. Influences of the textural properties and doped nitrogen on the adsorption performances were investigated. The experiment results demonstrated that nitrogen doping showed positive effects on CO 2 uptake at 1 bar, and had strong influence on the CO 2 /N 2 selectivity.
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
危险品化学品经营许可证（带存储）