MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Jia Luo,Ao Zhou,Lesen Ma,Xiangfei Kong,Zhenguang Hu,Fuxin Zhong,Peipei Zhang,Haijun Tan
The uncontrolled release of gaseous iodine species (I 2 , organic iodides) under nuclear accident conditions is increasingly causing severe regional ecological disasters, creating an urgent need for the development of highly efficient iodine adsorbents for nuclear waste treatment. In this study, we designed and synthesized an anthracene-scaffolded triazine-based porous organic polymer (POP-W) via Friedel-Crafts alkylation reaction. This polymer exhibits a straightforward synthesis, outstanding environmental stability, and distinctive pore structure characteristics. Nitrogen sorption characterization revealed that POP-W possesses mesoporous characteristics, exhibiting a Brunauer-Emmett-Teller (BET) specific surface area of 307.96 m 2 g −1 , a total pore volume of 0.174 cm 3 g −1 , and a Barrett-Joyner-Halenda (BJH) adsorption average pore diameter of 2.95 nm. In iodine vapor adsorption tests at 75 °C, POP-W achieved a maximum uptake capacity of 4.29 g g −1 . Furthermore, Langmuir model fitting indicated a Theoretical maximum adsorption capacity of 509.47 mg g −1 for iodine in n-hexane solution. The outstanding performance of POP-W demonstrates significant potential for application in the immobilizati0on and recovery of radioactive iodine isotopes (e.g., 129 I, 131 I) from nuclear waste streams.
研究领域:
核化学
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环境科学
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高分子化学
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吸附技术
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材料科学
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产品关联
DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2018
·Vol. 96
·期 12
·2586-2592
·
IF 1.265
Renjie Deng,Kuiyi You,Fangfang Zhao,Pingle Liu,He'an Luo
In this work, a simple method for the highly selective preparation of valuable dinitronaphthalene from 1-nitronaphthalene employing NO 2 as a nitrating agent has been developed. The results demonstrated that HY zeolite as an eco-friendly and stable catalyst exhibits good catalytic performances. The total selectivity to valuable dinitronaphthalene compounds including 1,5-, 1,4-, and 1,3-dinitronaphthalene can reach 87.6 % in our present nitration reaction. Meanwhile, the physico-chemical properties of catalysts were characterized by XRD, FTIR, TG/DTG, BET, and NH 3 -TPD, and the probable nitration reaction mechanism was also suggested in this paper. The present nitration process seems to be a mild, eco-friendly, and economical route for the preparation of valuable dinitronaphthalene compounds.
研究领域:
化学工程
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催化
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环境化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wen-Xuan Liang,Yan Wei,Meng Qiao,Ji-Wen Fu,Jie-Xin Wang
Algal bloom caused by excessive phosphate is toxic to the ecosystem and human health, and lanthanum carbonate (LC) as an adsorbent is efficient for phosphate removal. Herein, we propose an efficient high-gravity-assisted precipitation method to synthesize LC with polymorphs and various morphologies including amorphous LC (ALC), flower, layer, and rod in a rotating packed bed (RPB) by adjusting reaction temperature, time, and solvent. Compared to traditional stirred tank reactor, the RPB can prepare smaller LC particles with narrower size distribution in a shorter reaction time. Remarkably, the 35 nm ALC with the highest BET surface area (106 m 2 /g) can remain steady among 6 months of storage and exhibits superior adsorption performances with a high adsorption rate (reaching equilibrium within 1 h) and adsorption capacity (162 mg P/g). Especially, its adsorption capacity per unit time is currently at the leading level reported in the literature. The possible adsorption mechanism reveals that the amorphous state, nanonization and high BET surface area of LC accelerate the dissolution procedure to allow more complete exposure of the intrinsic active sites for ligand exchange and maximize La utilization, resulting in the remarkable improvement of adsorption performance. These findings suggest that amorphous nanoparticles serve as a novel state-of-art candidate toward greatly improved efficiency of ions removal in wastewater.
研究领域:
环境科学
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化学工程
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水处理
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产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 98
·期 2
·310-318
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IF 2.326
Sun Yangyi,Mao Yijing,Zhang Chengyu,Di Ningyu,Qi Dongming,Shentu Baoqing
In this work, organic–inorganic hybrid hollow mesoporous silica spheres (HMSs) have been synthesized by a core-template-free microemulsion method, and the thermodynamic and kinetic of the adsorption process of Cu 2+ on the HMSs are detailly investigated. Thermodynamic results showed that the adsorption process obeyed the Langmuir model with a maximum adsorption capacity of 52.0 mg/g. Kinetic studies fitted well with the pseudo-second-order model, and the intraparticle diffusion model showed that the interparticle diffusion is not the sole adsorption rate-limiting step, the adsorption process was jointly controlled by both the external surface attraction interaction and interparticle diffusion interaction between the HMSs and Cu 2+ . The adsorption capacity of different HMSs is highly depended on the surface charge and their BET surface area. These experimental results provide some theoretical guidance for the metal ions adsorption on the HMSs.
Organic–inorganic hybrid hollow mesoporous silica spheres are synthesized by a core-template-free microemulsion method, and thermodynamic and kinetic of the adsorption process of Cu 2+ are detailly investigated.
研究领域:
材料科学
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环境科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lanlan Guo,Wei Zhao,Linlin Dong,Xin Shi,Guodong Wang,Rui Li,Jianliang Cao,Xueli Yang,Xiaolian Liu,Yan Wang
The construction of high-performance sensitive materials is a basis for excellent sensors. Among prior SnS 2 -based sensors, high sensing performance often accompanies high operating temperatures or expensive costs, which limits their practical use. Herein, we employed Sr doping and NaBH 4 treatment strategies to increase the S-vacancies content in the SnS 2 microflowers. Particularly, this composite sensitive material shows large specific surface area, low crystallinity and rich S-vacancies content, which enables this sensor excellent sensing properties toward NO 2 , with a response of 4.7 toward 5 ppm NO 2 at 100 °C. In addition, this sensor has a low detection limit for NO 2 as low as 0.2 ppm, which is a lower value compared to many SnS 2 -based NO 2 sensors as reported. XRD, SEM, TEM, EPR and BET characterization combined with density functional theory (DFT) calculations are adopted to illustrate the enhancement mechanism toward NO 2 of the composite sensitive materials fabricated in this work. This study provides new ideas and scientific basis for the construction of metal sulfide based NO 2 sensors, which has important theoretical significance and application value.
研究领域:
材料科学
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传感器技术
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计算化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Qun Li,Tareque Odoom-Wubah,Yaping Zhou,Rafal Mulka,Yanmei Zheng,Jiale Huang,Daohua Sun,Qingbiao Li
The search for efficient and durable catalysts for volatile organic compounds oxidation is essential for environmental remediation. Herein, porous coral-like cobalt–manganese oxide (CoMnOx) catalyst was synthesized through annealing Co–Mn–1,3-propanediol precursors at 300 °C in air and applied for the catalytic oxidation of benzene. The as-prepared CoMnOx exhibited uniform porous coral-like structure, with an improved benzene catalytic abatement performance as compared to those of Mn3O4 and Co3O4 samples prepared by the same method, respectively. According to BET, H2-TPR, O2-TPD, and XPS analysis, the as-obtained CoMnOx catalyst showed the highest BET surface area, better low-reducibility temperature, and high content of absorbed oxygen groups when compared to Mn3O4 and Co3O4, which makes significant contribution to its catalytic benzene oxidation activity. Moreover, a plausible surface reaction mechanism for benzene oxidation over CoMnOx catalyst was also proposed through the in situ DRIFTS study.
研究领域:
环境科学
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催化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Tongmou Geng,Can Zhang,Guofeng Chen,Lanzhen Ma,Weiyong Zhang,Hongyu Xia
Two tetraphenylethylene-based fluorescent conjugated microporous polymers were obtained by the polymerization of a CH 3 SO 3 H catalyzed Friedel−Crafts polymerization reaction. The resulting CMPs show high thermal stability with a decomposition temperature above 575 and 487 °C, and have the porosity with BET surface area of 564.8 and 44.1 m 2 g −1 , respectively. Due to the introduction of tetraphenylethylene units, the CMPs have excellent fluorescence sensing performance for I 2 with high Ksv of 1.53 × 10 5 and 9.07 × 10 4 L mol −1 . Taking advantage of such porosity, effective sorption sites, and charge-transfer interactions, which display excellent I 2 adsorption capacity in vapor with the uptake of up to 3.41 and 2.91 g g −1 .
研究领域:
材料科学
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化学
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 43
·24276-24285
·
IF 2.936
Karim Khan,Ayesha Khan Tareen,Sayed Elshahat,Naseer Muhammad,Jia Li,Israa Aboodd,Luigi Bibbò,Ashish Yadav,Rizwan Ur Rehman Sagar,Usman Khan,Zhengbiao Ouyang
In the present study we synthesized conductive nanoscale [Ca24Al28O64]4+(4e−) (hereafter denoted as C12A7:e−) material, and reduced graphene oxide (rGO) was produced, which was unexpected; graphene oxide was removed after melting the sample. The conductivity of C12A7:e− composites synthesized at 1550 °C was 1.25 S cm−1, and the electron concentration was 5.5 × 1019 cm−3. The estimated BET specific surface area of the highly conductive sample was 20 m2 g−1. Pristine C12A7:e− electride was obtained by melting the composite powder, but the nano size of C12A7:e− particles could not be preserved; the value of conductivity was ∼28 S cm−1, electron concentration was ∼1.9 × 1021 cm−3, and mass density was 93%. For C12A7−xVx:e−, where x = 0.25 to 1, the conductivity improved to a maximum value of 40 S cm−1, and the electron density improved to ∼2.2 × 1021 cm−3; this enhancement in conductivity was also proposed by a theoretical study but lacked any associated experimental support.
研究领域:
材料科学
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电气工程
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Chengzhi Wang,Fengyu Gao,Songjin Ko,Hengheng Liu,Honghong Yi,Xiaolong Tang
The presence of SO 2 in industrial flue gases will cause permanent deactivation of the catalyst active centre. Therefore, an effective method to improve the SO 2 resistance of manganese-based catalysts at low temperatures is urgently needed. In this work, a hierarchical porous nanowire structure catalyst was designed by the in situ self-assembly method to inhibit SO 2 adsorption. This hierarchical porous nanowire aerogel catalyst with great BET surface area and surface acidity exhibited NOx conversion above 90% at 100–400 °C. Notably, the NOx conversion of the MnCe-N catalyst was almost not inhibited by SO 2 (250 ppm) compared to the 33% decrease of the MnCe-P catalyst. On the MnCe-P catalyst, SO 2 has strong competitive adsorption with NH 3 and NO, and the stronger adsorption capacity of SO 2 inhibits the adsorption activation of the reaction gas and hinders the reaction proceeding through the L-H mechanism. Meanwhile, a large quantity of sulfate is formed on the catalyst surface, which prevents the active centre to participate in the redox reaction. The structure of nanowires enhances the number of acid sites, facilitates the adsorption and activation of NH 3 , and effectively inhibits the adsorption of SO 2 on the MnCe-N catalyst. Fewer sulfate species are generated and difficult to deposit and aggregate on the catalyst surface, as a result, the active centre is less affected by sulfate species. The stable adsorption of NH 3 -related species ensures reliable reaction on MnCe-N through the E-R mechanism. This work emphasizes the importance of hierarchically porous structures in improving the NH 3 -SCR performance and SO 2 resistance of monolithic catalysts, and provides new insights into the design of highly efficient and stable catalytic materials.
研究领域:
催化
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wei Zhou,Wenwei Zhang,Xueqin Ma,Haichen Lai,Xingguang Zhang
Metal-zeolites catalysts are of great importance in selective organic conversions. Zeolites possess features of highly-ordered porous network, adjustable acidic properties (Brønsted/Lewis), spatial nanoconfinement effects, unique shape selectivity and the strong (hydrothermal-) stability. The role of zeolite hydroxyl (z-OH) groups, such as bridging ones in Si-O(H)-Al (B acids) and terminal ones in Al-OH and Si-OH (silanols), in catalysis is an interesting topic, particularly when they are not catalytic active sites, while they affect the catalytic performances. This study comprehensively investigated series of Au/USY catalysts in the selective oxidation of benzyl alcohol to benzaldehyde and clarified the dominating contributions of Al-associated z-OH groups to affecting catalytic conversions and selectivity via altering the Si/Al ratio and reducing z-OH groups by amorphous silica species derived from diethoxydimethylsilane under high-temperature calcination. The catalysts were characterized by XRD, BET, TEM, XPS, UV/Vis, FT-IR and in-situ DRIFT to investigate crystal structures, textural properties, morphologies, size distribution, chemical state of gold, acidity, and adsorptive properties. The experimental results proved that zeolites with a higher amount of z-OH groups tuned by Si/Al ratios or by diethoxydimethylsilane silylation exhibited higher catalytic activity because of the adsorption effect. Finally, a possible mechanism was discussed based on the experimental results and literature.
研究领域:
催化
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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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Tianjiao Wang,Hongyan Yao,Ningning Song,Yanchao Yang,Kaixiang Shi,Shaowei Guan
In recent years, linear polyimides of intrinsic microporosity have been widely used in the field of gas adsorption and separation because of their high BET surface area and microporous structures. Most of the microporous structures come from the twisted main-chain structures in the linear polyimides of intrinsic microporosity. Therefore, most linear polyimides (PI) without twisted structure have no porosity. Herein, to construct the linear polyimide with microporous structure, a sequence of microporous polyimides (PIs-CL) were constructed from the flexible linear polyimide precursors through the thermal crosslinking reaction. The polyimide precursors without twisted structure were synthesized from a well-designed diamine TFVBPA with cross-linkable ethynyl groups and several commercial dianhydrides (ODPA, BPDA, PMDA and 6FDA) by polycondensation to research the influence of the main-chain structure on the porous characters. The introduction of crosslinked structures gives the linear crosslinked polyimides (PIs-CL) with porous structures. The PIs-CL show obviously improved porosity (0.52–1.71 nm) and higher BET surface area (337–618 m 2 g −1 ) than those of the uncrosslinked polyimides (PIs). Moreover, PIs-CL have favorable CO 2 adsorption (5.7–9.3 wt%) as well as good CO 2 /N 2 selectivity (34.4–58.5) at 273 K, which are better than other polyimides materials. The introduction of crosslinked structures is an effective way to improve microporous porosity and gas sorption performance.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2017
·
IF 3.684
Hongyan Yao,Na Zhang,Kunzhi Shen,Ningning Song,Kaixiang Shi,Shiyang Zhu,Yunhe Zhang,Shaowei Guan
A dianhydride monomer 2, 5-bis(3, 4-dicarboxyphenoxy)-4′-phenylethynyl biphenyl (PEPHQDA) containing a chain extendable phenylethynyl pendant group has been successfully synthesized via successive nucleophilic substitution , Sonogashira cross-coupling, hydrolysis and dehydration reactions. A flexible microporous polyimide network has been prepared based on the use of triamine (TAPOB), affording hyperbranched polyimide, followed by the curing of phenylethynyl groups to give network structure. Specifically microporous features such as a well-defined surface morphology , microporous structure and nanometer-sized pore channels have been introduced to the flexible polyimide networks through this two-step pathway. This network exhibit a BET surface area (322 m 2 g −1 ) as well as a comparable CO 2 uptake (1.25 mmol g −1 at 273 K and 1 bar) and enthalpy of adsorption (30.3 kJ mol −1 ) to that of other microporous polyimides derived from rigid tridimensional monomers.
研究领域:
高分子科学
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材料科学
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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）