SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Qiuting Xu,Jia Lei,Lixi Chen,Jiahui Xu,Guodong Li,Jun Wan,Linfeng He,Yufei Shen,Guangkuo Wei,Guoxun Ji,Duo Zhang,Liang Sun,Shuao Wang
Radon (Rn) is a radioactive noble gas and one of the primary culprits of lung cancer. Developing efficient adsorbents for Rn removal is of paramount importance, yet remains a daunting challenge due to the weak interaction between Rn and the adsorbent, particularly when low concentrations of Rn are present. Herein, a renewable biomass-derived carbon material consisting of rich ultramicropores was synthesized for record-high Rn adsorption under ambient condition. By meticulously selecting the carbonization precursor, chemical activator, and pyrolysis temperature, the optimized adsorbent, GC-700-2.4, exhibits a narrow pore distribution in the ultramicroporous range (<7 Å). The dynamic adsorption coefficient ( K d ) of GC-700-2.4 is determined to be 9.51 L/g based on radon breakthrough experiments, which is twice the value of the commercial Rn adsorbent, coconut shell activated carbon ( K d = 4.65 L/g), and outperforms all other reported Rn adsorbents under comparable conditions. The superior Rn adsorption performance of GC-700-2.4 is attributed to the narrow ultramicropores in GC-700-2.4 that show enhanced confinement effect toward Rn. Consequently, GC-700-2.4 shows promising potential for practical applications as an efficient and cost-effective Rn adsorbent.
研究领域:
材料科学
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环境科学
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核化学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
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2023
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IF 5.2
Duanlian Tang,Xiaoying Lyu,Zhixian Huang,Renwei Xu,Jie Chen,Ting Qiu
Nitrogen-doped microporous carbon, which features a uniquely tunable porosity, exhibits promisingly high adsorption prospects in the greenhouse gas capture and water treatment. Herein, we propose a series of novel N-doped microporous carbons (CMPA n -C1000), and precisely tune their porosities via a direct pyrolysis of rigid conjugated microporous poly(aniline)s (CMPA n , n = 1, 2, 3) with pore size difference in a molecular level, as achieved by simply tuning their linkers with varying sizes, planarity, and symmetry. The CMPA3-C1000, with a satisfactory amount of nitrogen heteroatoms , high S BET of ∼800 m 2 g −1 , and large ultra-micropore volume of 0.25 cm 3 g −1 , has excellent CO 2 capture ability ( i.e. , 5.1 mmol g −1 at 273 K, 1 atm) and Hg(II) adsorption performance ( i.e. , Q e = 571 mg g −1 ; k 2 = 0.0031 g mg −1 min −1 ), respectively. CMPA3-C1000 might perform chemisorption towards Hg(II), according to calculations using density functional theory and experimental data; nitrogen atoms in porous carbon contributed to this excellent Hg(II) adsorption.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2014
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IF 3.552
Jing-Chuan Song,Zhong-Yuan Lu,Zhao-Yan Sun
3-Aminophenol/formaldehyde (AF) resin colloidal spheres with narrow size distribution and high nitrogen content are synthesized in the presence of urea. The obtained particles that indicated by transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM) are spherical morphology and uniform. It can be further carbonized into carbon spheres preserving high nitrogen percent. The particle size is tunable from 300 nm to 850 nm by appropriately varying the concentration of precursor or water/ethanol volume ratio. Even using the water as an only solvent, we can also obtain spherical particles with different size. Typically, the nitrogen percent in the obtained polymer and carbon particles is as high as 10.39 wt% and 8.95 wt%, respectively. The typical surface area of resulted carbon particles obtained from nitrogen adsorption measurement is 459 m 2 g −1 . X-ray diffraction demonstrates the obtained carbon spheres are amorphous , which are expected to have practical application in the field of energy devices. The method can be considered as a low cost and facile method for mass production.
研究领域:
材料科学
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化学工程
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2014
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IF 3.209
Chiyao Bai,Juan Li,Songbai Liu,Xiaoyu Yang,Xiaodan Yang,Yin Tian,Kecheng Cao,Ying Huang,Lijian Ma,Shoujian Li
The present research developed a strategy for in situ synthesizing functionalized ultra-microporous carbons by “segregated” microwave irradiation using covalent organic frameworks as simultaneous C and N source. The products have high N-doping concentration (>30 wt%), narrow pore size distribution, and the surface area of 507 and 243 m 2 /g at the pore size of 0.4 and 0.6 nm, which are much larger than the specific area (2 and 117 m 2 /g) of samples prepared by conventional heating. They exhibit outstanding chemical, irradiation and thermal stabilities. Meanwhile, the carbonaceous COFs could retain the bulk morphology of the precursors and possess a unique functional group (cyano) which is helpful in material characters or in further modification. The findings support the potential use of “segregated” microwave irradiation in preparation of functional microporous carbons without any other additional process, and this method can also overcome the drawbacks of conventional heating and expand the range of microwave irradiation. The thus-prepared carbons were used as adsorbents for uranium recovery from a simulated nuclear effluent containing 12 co-existent cations with different pH value (4.5, 2.5 and 1.0). Results from batch experiments showed the amount of uranium adsorbed accounts for unreported 80% of the total adsorption amount at pH 1.0 with uranium sorption capacity of 50 mg/g. In addition, the carbonaceous COFs could be applicable to various fields, such as heavy metal removal, gas storage, and could be beneficial for exploration of the behaviors of ions in sub-nanometer pore (<1 nm) in the fields of carbon super-capacitors.
研究领域:
材料科学
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环境科学
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化学工程
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核工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
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2023
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IF 17.6
Jiafeng He,Hu Hong,Sanlue Hu,Xiliang Zhao,Guangmeng Qu,Lin Zeng,Hongfei Li
Rechargeable Zn-I 2 batteries featuring intrinsic safety and high energy density demonstrate promising energy storage prospects. However, the poor interface stability of the Zn anode and the undesirable shuttle effect severely hinder the device stability due to the diffusive characteristics of the soluble polyiodides in aqueous media . Here, a synergetic physicochemical strategy that combines physical constraints and chemical absorption was proposed by developing a composite host matrix with a core/porous-sheath structure, which can effectively confine iodine species. Initial I − ions bind securely with carboxylated multi-walled carbon nanotubes (c-MCNTs) to form the C–I bonds through chemical interactions. Furthermore, the pore structure of microporous carbon (MPC) not only restricts the iodine species in the pores through physisorption (secondary adsorption) but also facilitates the diffusion of Zn 2+ . The as-prepared carbon nanotubes coated with microporous carbon (glucose as the carbon source, and its ratio to CNT is 12:1) can serve as a host material (CNT@MPC12), and adsorb iodide ions to derive CNT@MPC12-I − . As a result, the developed aqueous Zn battery with CNT@MPC12-I − cathode delivers superior reversible rate capacity (0.35 mA h cm –2 at 20 mA cm –2 ) and remarkable cycling performance (12,000 cycles at 10 mA cm –2 ). Notably, such cathode can also exhibit an impressive capacity retention of 97% after 8600 cycles, even at an ultrahigh loading mass of 16.05 mg cm –2 . As such, our strategy can be extended to design other metal I 2 batteries with high loading and long-life expectancy.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
Green Energy & Environment
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2020
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IF 6.395
Hongtai Li,Yanxiao Chen,Quan Jin,Wei Xiang,Benhe Zhong,Xiaodong Guo,Bao Wang
Serious shuttle effect and sluggish conversion kinetics of lithium polysulfides (LiPSs) have a massive impact on obstructing the practical application of lithium-sulfur (Li–S) batteries. To address such issues, Fe-Nx sites enriched microporous nanoflowers planted with tangled bamboo-like carbon nanotubes (Fe-Nx-C/Fe 3 C-CNTs NFs) are found to be effective catalytic mediators with strong anchoring capabilities for LiPSs. The bamboo-like carbon nanotubes catalyzed by Fe 3 C/Fe entangled each other to form a conductive network, which encloses a flower-like microporous carbon core with embedded well-dispersed Fe-Nx active sites. As expected, electrons smoothly transfer along the dense conductive bamboo-like carbon network while the flower-like carbon core consisting of micropores induces the homogeneous distribution of tiny sulfur and favors the lithium ions migration with all directions. Meanwhile, Fe-Nx sites strongly trap long-chain LiPSs with chemical anchoring, and catalyze the redox conversion of LiPSs. Due to the aforementioned synergistic effects, the [email protected] /Fe 3 C-CNTs NFs cathode exhibited a remarkable specific capacity (635 mAh g s −1 ) at 3 C and a favorable capacity decay with 0.04% per cycle even after 400 cycles at 1 C.
研究领域:
材料科学
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能源存储
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电化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Qinzhi Wang,Hui Zhangsun,Yijian Zhao,Yuting Zhuang,Zhihao Xu,Tong Bu,Ruixia Li,Li Wang
Electrochemical analysis enables pesticides monitoring become rapid and efficient. Herein, novel three dimensional nitrogen–doped macro–meso–microporous carbon composites (N/Cu–HPC) derived from polyvinylpyrrolidone (PVP) doped Cu–metal organic framework were successfully formed via one–pot solvothermal method followed by pyrolysis , which were further applied in high–performance electrochemical determination of neonicotinoid. The introduction of PVP endows the N/Cu–HPC good hydrophilicity preventing aggregation as well as more highly electronegative nitrogen species boosting electro–catalytic property dramatically. Interestingly, the macro–meso–microporous architecture improves mass and charge transports between neonicotinoid molecules and active sites such as Cu nanoparticles and carbon atoms possessing Lewis basicity next to pyridinic-N. Based on the N/Cu–HPC, imidacloprid (IDP), thiamethoxam (THA) and dinotefuran (DNF) were detected with wide linear detection ranges (0.5–60 μM for both IDP and DNF, 1–60 μM for THA) and low detection limits (0.026 μM for IDP, 0.062 μM for THA and 0.01 μM for DNF). Meanwhile, this sensor can be successfully used for determination of IDP, THA and DNF in oat, corn and rice with good recoveries (92.0–100.9%, RSD ≤ 4.8%), demonstrating that the N/Cu–HPC possesses a high potential to be an advanced sensing device for monitoring neonicotinoid in agricultural products.
研究领域:
材料科学
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分析化学
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环境科学
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农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）