JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 10
·4387-4396
·
IF 1.754
Shao Yujie,Liu Yan,Jiang Chao,Wang Changfu,Ye Zhiwei,Xu Jianda,Liu Jinbiao
In this study, heteroatom-doped carbon materials (HDC) were prepared from polyphosphazene as raw materials. Then HDC was modified by nitro reduction method to obtain aminated porous carbon material (HDC-NH 2 ). The structure and morphology of HDC-NH 2 were characterized by Fourier Transform infrared spectroscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. The adsorption properties of HDC and HDC-NH 2 for uranyl ions in aqueous solution were studied under the conditions of pH, contact time, initial concentration and temperature. The results showed that the ideal adsorption pH for HDC and HDC-NH 2 was both 6, and the time to reach equilibrium was 80 and 20 min, while the maximum adsorption capacity can reach 227.68 and 1087.06 mg/g according to the Langmuir model, respectively. The comprehensive analysis of adsorption behavior and kinetics can prove that HDC-NH 2 has the potential to effectively remove U(VI) ions from solution.
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 ANALYTICAL AND APPLIED PYROLYSIS
·
2022
·
IF 6.437
Xin Jin,Lunjing Yan,Beibei Cui,Jiao Kong,Meijun Wang,Liping Chang,Frederik Ronsse,Weiren Bao
The carbon material prepared by co-pyrolysis of biochar and caking coal has been proved that it acts in catalytic conversion of volatiles and could be used in a granular bed duster as filter medium due to its high abrasive resistance in the coal pyrolysis technology. In this work, inactive carbon material loaded by nickel (Ni/ICM) was prepared by pyrolysis of the blend of biochar ion exchanged with nickel and caking coal, and then was steam activated obtaining activated carbon material loaded by nickel (Ni/ACM). The study investigated the in-situ catalytic conversion process of coal pyrolysis volatiles over Ni/ICM and Ni/ACM in a continuous pyrolysis downer-bed reactor. The physical and chemical properties of Ni/ICM and Ni/ACM, pyrolysis product distribution and the component of tar were analyzed, especially, the coke suspended in tar (Coke-S) was separated from tar and characterized in detail. Results show that the crystallite size of Ni and NiO in Ni/ICM is about 5–7 nm, and that is slightly larger in Ni/ACM. Compared to Ni/ICM, more nickel species, pores, acid sites, oxygen-containing functional groups and carbon defects are contained in Ni/ACM. The yields of tar and light tar (boiling point below 360 °C) are higher over Ni/ICM than over Ni/ACM. Ni/ICM further improves the tar quality compared to ICM, and the content of light oil in tar increases from 22.0 wt% over ICM to 30.6 wt% over Ni 3.2 /ICM. The highest light oil yield is obtained over Ni 1.9 /ICM as 3.6 wt% and the lowest pitch yield is obtained over Ni 3.2 /ICM as 3.5 wt%. The characterization of Coke-S shows that it is composed of large aromatic clusters crosslinked by oxygen and fine ash particles. The large aromatic clusters, as heavy component in tar, are found that its H/C molar ratio increases and condensation degree decreases over Ni/ICM and Ni/ACM in comparison with ICM and ACM, respectively, which also means that the quality of tar is improved. Besides, the oxygen in the tar may have been transferred to the coke.
研究领域:
能源化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2017
·
IF 2.865
Yingjie Li,Wenfeng Li,Qingnan Liu,Hong Meng,Yingzhou Lu,Chunxi Li
For the first time, a series of alkynyl carbon materials (ACMs) were prepared via the mechanochemical reaction of CaC 2 with six polyhalogenated precursors, namely CCl 4 , C 2 Cl 6 , C 2 Cl 4 , C 6 Cl 6 , C 6 Br 6 , and C 14 H 4 Br 10 (ACM-1, ACM-2, ACM-3, ACM-4, ACM-5, and ACM-6, respectively) and used for the adsorptive removal of mercury from aqueous solutions. Based on preliminary investigations, the adsorption of mercury on ACM-5 was studied in depth. Specifically, the effect of pH on mercury adsorptivity , adsorption kinetics, thermodynamics, isotherms, and recyclability was studied. The adsorptivity of mercury on ACMs was found to be closely related to the hydrocarbon precursor, specific surface area of sorbent , and the alkynyl content. ACM-5 showed the best performance and is among the best raw carbonaceous sorbents reported so far, with a Langmuir saturated adsorption capacity of 191.9 mg g − 1 . The promising mercury adsorption performance mainly arises from the strong Lewis soft acid–soft base interactions between the alkynyl groups and mercury ions. The adsorption isotherms could be satisfactorily correlated with the Langmuir equation. The results show that the ACMs can be used as efficient sorbents for the removal of mercury and may also be useful for the adsorption of other heavy metals.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jun Shi,Tao Huang,Ruoyu Wu,Jiani Wu,Yulong Li,Yongxi Kuang,Hongmei Xing,Wenli Zhang
Designing carbon materials with specific oxygen-containing functional groups is very attractive for the precise decoration of carbon electrode materials and the basic understanding of specific charge storage mechanisms, which contributes to the further development of high-performance carbon materials for energy storage and conversion applications. In this contribution, a hydroxyl-rich micropore-dominated porous carbon material was obtained by direct carbonization of cellulose. The content of oxygen atoms in hydroxyl form in the obtained carbon is nearly 6 at.%. With the pyrolysis temperature changed, the macroscopic morphology, the specific surface area, surface functional groups, and graphitization degree of the carbon materials were changed strongly. Besides, the carbon material obtained with a carbonization temperature of 900 °C (C9) showed enhanced specific capacitance in sulfuric acid, sodium hydroxide, and sodium sulfate aqueous electrolytes, which mainly originates from the contribution of pseudocapacitance. The pseudocapacitance mainly depends on the presence of surface hydroxyl functional groups. Besides, the pseudocapacitance value of C9 material in neutral electrolytes (151.34 F g −1 ) is about twice that in acidic (75.9 F g −1 ) and alkaline (75.78 F g −1 ) electrolytes.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Kejing Wu,Junbo Wang,Yingming Zhu,Xueting Wang,Chunyan Yang,Yingying Liu,Changjun Liu,Houfang Lu,Bin Liang,Yongdan Li
The β-Mo2C on different carbon supports was prepared conveniently via direct H2 reduction or self-reduction for catalytic conversion of Kraft lignin into aromatic hydrocarbons, aromatic alcohols, and aromatic aldehydes. The β-Mo2C on macroporous carbon (MC) with large pore size exhibits the highest activity with aromatic yield of 0.543 g/g Kraft lignin at 280 °C for 3 h, resulting from the accessibility of lignin fragments to β-Mo2C. Mo, MoO2, and MoO3 possess relatively low activity. Higher calcination temperature is required to obtain β-Mo2C over graphite (Gr) support than MC and activated carbon (AC), and small grain size of Gr-supported catalysts is beneficial for high activity. The β-Mo2C on AC exhibits the highest selectivity to aromatic hydrocarbons, which are attributed to highly dispersed β-Mo2C in micropores.
研究领域:
催化化学
·
材料科学
·
生物质转化
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 3
·924
·
IF 3.748
Bixia Jiang,Lin Cao,Qinghua Yuan,Zhuwen Ma,Zhenrui Huang,Zhidan Lin,Peng Zhang
A large amount of biomass straw waste is generated every year in the world, which can cause serious environmental pollution and resource waste if disposed of improperly. At present, biomass-derived porous carbon materials prepared from biomass waste as a carbon source have garnered attention due to their renewability, huge reserves, low cost, and environmental benevolence. In this work, high-performance carbon materials were prepared via a one-step carbonization-activation method and ball milling, with waste tobacco straw as precursor and nano-ZnO as template and activator. The specific surface area and porous structure of biomass-derived carbon could be controlled by carbonization temperature, which is closely related to the electrochemical performances of the carbon material. It was found that, when the carbonization temperature was 800 °C, the biochar possesses maximum specific surface area (1293.2 m2·g−1) and exhibits high capacitance of 220.7 F·g−1, at 1 A·g−1current density in a three-electrode configuration with 6 M KOH aqueous solution. The capacitance retention maintained about 94.83% at 5 A·g−1after 3000 cycles. This work proves the porous biochar derived from tobacco straws has a great potential prospect in the field of supercapacitors.Keywords:porous carbon materials;supercapacitor;tobacco straws;biochar
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2020
·
IF 14.588
Qingping Wu,Zhenguo Yao,Xuejun Zhou,Jun Xu,Fahai Cao,Chilin Li
A cathode host with strong sulfur/polysulfide confinement and fast redox kinetics is a challenging demand for high-loading lithium–sulfur batteries. Recently, porous carbon hosts derived from metal–organic frameworks (MOFs) have attracted wide attention due to their unique spatial structure and customizable reaction sites. However, the loading and rate performance of Li–S cells are still restricted by the disordered pore distribution and surface catalysis in these hosts. Here, we propose a concept of built-in catalysis to accelerate lithium polysulfide (LiPSs) conversion in confined nanoreactors, i.e., laterally stacked ordered crevice pores encompassed by MoS2-decorated carbon thin layers. The functions of S-fixability and LiPS catalysis in these mesoporous cavity reactors benefit from the 2D interface contact between ultrathin catalytic MoS2 and conductive C pyrolyzed from Al-MOF. The integrated function of adsorption–catalysis–conversion endows the sulfur-infused C@MoS2 electrode with a high initial capacity of 1240 mAh g–1 at 0.2 C, long life cycle stability of at least 1000 cycles at 2 C, and high rate endurance up to 20 C. This electrode also exhibits commercial potential in view of considerable capacity release and reversibility under high sulfur loading (6 mg cm–2 and ∼80 wt %) and lean electrolyte (E/S ratio of 5 μL mg–1). This study provides a promising design solution of a catalysis–conduction 2D interface in a 3D skeleton for high-loading Li–S batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Min Yuan,Meizhen Gao,Qi Shi,Jinxiang Dong
Zeolitic imidazolate framework (ZIF)-derived porous carbons are a new subclass of N-doped porous carbon materials showing great potential for many applications. However, water vapor is present in various industrial applications, and previous studies have tended to neglect water adsorption on ZIF-derived porous carbons. In this study, ZIF-8-derived porous carbon materials exhibiting different surface chemistry and pore structure have been prepared, and used to characterize the behavior of water adsorption. Investigations suggest that water uptake at P / P 0 < 0.2 is positively correlated with the N content, and that pyridinic-N and pyrrolic-N species make the dominant contribution to this water uptake. Strong polarization of surface structure occurs in pyridinic-N and pyrrolic-N species, which provides strong electrostatic interactions between these species and water, leading to an increase in the low-pressure adsorption capacity. As the pressure is increased, the water adsorption process becomes highly dependent upon the porous structure, and there is a critical pore width above which pore-filling occurs. Our results indicate that water uptake at P / P 0 = 0.6, 0.8, and 0.9 is indeed directly proportional to cumulative pore volume with pore widths of the 12, 22 and 40 Å, respectively. Thus, the small micropores of <12 Å are filled first at P/P 0 < 0.6, followed by the larger micropores of 12–22 Å at 0.6 < P/P 0 < 0.8, and finally the mesopores of 22–40 Å at 0.8 < P/P 0 < 0.9. The results presented in this work should be useful for the selection and construction of ZIF-derived porous carbon materials for applications where water is involved.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2019
·
IF 2.87
Jingyi Zou,Xiaogang Sun,Rui Li,Qiang He
Porous carbon materials are considered potential replacements for metal carriers in Li–SnO 2 batteries. Here, a 3D hierarchical porous carbon nanotube (CNT) scaffold was used as a collector to host SnO 2 . The novel collector comprised Co 2+ -doped porous carbon (PC) slices and a CNT network. The new Co–PC/CNT electrode demonstrated a high loading capacity of SnO 2 , accommodated the volume expansion of SnO 2 , and prevented its aggregation. Co played an important role in improving the initial discharge capacity and coulombic efficiency of the electrode. The SnO 2 –Co–PC/CNT electrodes exhibited outstanding electrochemical performance. The first-discharge specific capacity reached 2067 mAh·g −1 , and the utilization rate of active materials reached 82.92% at a current density of 100 mAh·g −1 . After 100 cycles, the specific discharge capacity remained greater than 698 mAh·g −1 , with a coulombic efficiency of 99.53%.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 19
·3512
·
IF 5.719
Zhaofeng Wu,Yidan Xia,Lixiang Liu,Qihua Sun,Jun Sun,Furu Zhong,Min Zhang,Haiming Duan
Waste human hair was carbonized into carbon sheets by a simple carbonization method, which was studied as gas sensing materials for the first time. The effect of carbonization temperature on the structure and gas sensing properties of hair-based carbon sheet was studied by scanning electron microscope, X-ray diffraction, infrared spectrum, Raman spectrum, and gas-sensitive tester. The results showed that the carbonization temperature had a significant effect on the structure and gas sensing performance of carbon sheets, which were doped with K, N, P, and S elements during carbonization. However, the sensor of the carbon sheet does not show good selectivity among six target gases. Fortunately, the carbon sheets prepared at different temperatures have different responses to the target gases. The sensor array constructed by the carbon sheets prepared at different temperatures can realize the discriminative detection of a variety of target gases. For the optimized carbon sheet, the theoretical limit of detection of hydrogen peroxide is 0.83 ppm. This work provides a reference for the resource utilization of waste protein and the development of gas sensors.Keywords:human hair;biomass carbon material;gas-sensitive properties;carbon sheets
研究领域:
材料科学
·
环境科学
·
传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Wenjie Liu,Chunyang Nie,Wenlang Li,Zhimin Ao,Shaobin Wang,Taicheng An
ABSTRACT In this work, low-cost carbon-based materials were developed via a facile one-pot pyrolysis of oily sludge (OS) and used as catalysts to activate peroxymonosulfate (PMS) for removing aqueous recalcitrant pollutants. By adjusting the pyrolysis temperature, the optimized OS-derived carbocatalyst manifested good performance for PMS activation to abate diverse organic pollutants in water treatment . Particularly, an average removal rate of 0.87 mol phenol per mol PMS per hour at a catalyst dosage of 0.2 g L −1 is attained by the OS-derived carbocatalyst, higher than many other documented catalysts. A series of experimental evidences consolidated that organic pollutants were oxidized mainly via electron-transfer mechanism albeit the detection of singlet oxygen ( 1 O 2 ) from PMS activation driven by the OS-derived carbocatalyst. Specifically, the proportion of carbonyl groups (C˭O) in the carbocatalyst adopted with selective modification treatments to tailor the surface chemistry was found to be linearly correlated with the catalytic activity and theoretical calculations demonstrated that the reactions between C˭O and PMS to form surface reactive complexes were more energetically favorable compared to 1 O 2 generation. Herein, this study not only offers a new strategy for reusing OS as value-added persulfate activators but also deepens the fundamental understanding on the nonradical regime.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 19
·9350-9357
·
IF 8.867
Jingjing Zhou,Jun Yang,Zhixin Xu,Tao Zhang,Zhenying Chen,Jiulin Wang
Rechargeable lithium–selenium (Li–Se) batteries are promising electrochemical systems with higher energy density than traditional Li ion batteries. Nevertheless, the dissolution of high-order lithium selenides and the shuttle effect in electrolytes lead to low Se utilization, inferior capacity and poor cycling performance. This study proposes a combination of nanostructured Se cathode materials and compatible carbonate electrolytes for promoting the performance of Li–Se batteries. Se/MC composite nanoparticles (∼35 nm) with a moderate Se content (≈51.4 wt%) were prepared by embedding Se into a metal–organic framework derived microporous carbon. The resulting Se/MC cathode exhibits significantly high rate capability and cycling stability in LiDFOB/EC-DMC-FEC electrolyte. It delivers a capacity of 511 mA h gSe−1 after 1000 cycles at 5C, with an inappreciable capacity decay of 0.012% per cycle. Even at a very high rate of 20C, a large capacity of 569 mA h gSe−1 can be obtained, corresponding to a decrease of only 5.6% compared to that at 0.5C. The impressive high rate performance is attributed to the co-effect of selenium confined in ultra-small microporous carbon particles and excellent compatibility of the electrolyte with both the Li anode and selenium composite cathode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）