JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Naseeb Ullah,Aymeric Ramiere,Waseem Raza,Pengfei Ye,Wei Liu,Xingke Cai,Zhengchun Peng,Ki-Hyun Kim
Chemical fixation of CO 2 with epoxides is an effective option to achieve sustainable synthesis of cyclic organic carbonates. Although metal–organic frameworks (MOFs) are promising catalysts for this reaction, their low stability in aqueous solutions makes this application infeasible. In an effort to overcome this limitation, cobalt-based metal–organic framework (Co(II)MOF) nanoribbons have been prepared by coordinating the Co(II) ions with a new ligand (C 16 H 12 N 4 O 4 ) full of oxygen and nitrogen moieties. Strong chemical interactions occur between the adsorbed CO 2 and oxygen/nitrogen atoms in this porous MOF structure. Co(II)-MOF nanoribbons with tetra- n -butylammonium bromide acted as cocatalysts with ∼97% yield of cyclic carbonate (reaction kinetic rate of 14.7 × 10 6 µmol g -1 h −1 ) upon the cycloaddition of epichlorohydrin (ECH) to CO 2 (>99% reaction selectivity under solvent-free reaction condition at 80 °C, 3 h and 1 MPa CO 2 pressure). This work may open a new avenue for chemical fixation of CO 2 by rational design of the components and morphology of MOF-based catalysts.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Jianzhang Gao,Jiadong Wang,Jiaqi Chen,Shitao Liao,Meng Cao,Fuqiu Ma,Yun Xue,Yongde Yan
Electrochemical techniques are considered promising applications to immobilize uranium in alkaline wastewater in order to prevent its migration into groundwater and soil. In this work, the results of electrochemical and Atomic Force Microscope (AFM) demonstrate a successful immobilization of uranyl in the carbonate system by U(VI)-U(V), U(V)-U(IV) reduction, and U(V) disproportionation reactions. The results indicated that the electrochemical fixation rate in alkaline system could reach more than 99%. The valence state of uranium is the key factor affecting its migration in the working system. Where, the analysis of the immobilized samples by X-ray photoelectron spectroscopy (XPS) revealed that pHs, current density, and the presence of foreign cations significantly affect the valence state of uranium in the immobilized samples. Under same conditions, the reduction reactions of U(VI)-U(V) and U(V)-U(IV) occurred easily. Where, at pH higher than 3.4 or the current density in the range of 0.5–20 mA/cm 2 , high content of U(V) and U(IV) in the immobilized products was obtained. Other conditions favored the occurrence of the electrolytic water reaction, and the immobilized samples were dominated by U(VI). It was found that the temperature showed the greatest effect on the electrochemical immobilization rate. Where, the electrochemical immobilization rate increased by about 1.8 times when the ambient temperature increased from 293.15 to 328.15 K. This study provides a new idea for the immobilization of uranium in alkaline wastewater and demonstrates the feasibility of electrochemical immobilization of uranium in alkaline systems.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2022
·
IF 6.556
Wei Lu,Wei Wang,Song Zhang,Wei Li
A rapid on-site determination of hydrogensulfite in food is of great importance for our health. Herein, a novel benzoindole-based fluorescent probe tethered with hydroxyl groups was synthesized. The probe displayed a good selectivity, fast response time (<68 s), and low determination limit (0.72 μM) in solution. In order to prepare high performance test strips, various immobilization methods of probes onto paper substrates were investigated, including physical absorption of probe onto filter paper (test strip-1) and chemical immobilization of probe onto BP-PAA-attached paper (test strip-2) or probe-attached BP-PAA onto paper (test strip-3). Results showed that the determination limit of test strip-2 was 9 μM, which was lower than that of test strip-1 (55 μM) and test strip-3 (104 μM). This phenomenon could be due to the deposition of most probes on the paper surfaces in the test strip-2 instead of the whole 3D paper structure (test strip-1) or the upper half of paper (test strip-3), which facilitated their reaction with hydrogensulfite . In particular, the test strip-2 could rapidly determine the amount of bisulfide in white-rot fungus, shiitake mushroom, and dried shrimp with good recoveries (91.8–104.1%), indicating the great application prospect of our proposed fluorescent test strip.
研究领域:
分析化学
·
食品安全
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 17
·2416
·
IF 5.3
Jun Chen,Yuanjiang Yang,Sheng Yu,Yi Zhang,Jiwei Hou,Nengfei Yu,Baizeng Fang
Nanocomposites that combine porous materials and a continuous conductive skeleton as a sulfur host can improve the performance of lithium–sulfur (Li-S) batteries. Herein, carbon nanotubes (CNTs) anchoring small-size (~40 nm) N-doped porous carbon polyhedrons (S-NCPs/CNTs) are designed and synthesized via annealing the precursor of zeolitic imidazolate framework-8 grown in situ on CNTs (ZIF-8/CNTs). In the nanocomposite, the S-NCPs serve as an efficient host for immobilizing polysulfides through physical adsorption and chemical bonding, while the interleaved CNT networks offer an efficient charge transport environment. Moreover, the S-NCP/CNT composite with great features of a large specific surface area, high pore volume, and short electronic/ion diffusion depth not only demonstrates a high trapping capacity for soluble lithium polysulfides but also offers an efficient charge/mass transport environment, and an effective buffering of volume changes during charge and discharge. As a result, the Li-S batteries based on a S/S-NCP/CNT cathode deliver a high initial capacity of 1213.8 mAh g−1at a current rate of 0.2 C and a substantial capacity of 1114.2 mAh g−1after 100 cycles, corresponding to a high-capacity retention of 91.7%. This approach provides a practical research direction for the design of MOF-derived carbon materials in the application of high-performance Li–S batteries.Keywords:lithium–sulfur batteries;carbon nanotubes;metal–organic framework;shuttling effect;chemical immobilization
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Chandra Bhanu Gupt,Sanandam Bordoloi,Sreedeep Sekharan,Ajit K. Sarmah
Low hydraulic conductivity and high chemical immobilization are the two characteristics that make bentonite a mandatory construction material for hazardous waste containment applications. We performed a comprehensive batch sorption study on Barmer bentonite (BB), an exclusive construction clay mined in India, using lead (Pb 2+ ) as a model contaminant. The maximum adsorption capacity of BB was obtained as 55 mg g −1 at pH 5 and 27 ± 2℃. Adsorption was extremely rapid, with equilibrium attained <5 min for the BB. Increased adsorbent dosage resulted in higher Pb 2+ percentage removal, while adsorption capacity decreased. Ionic strength, salt concentration, valency and ionic radius played a critical role in suppressing the adsorption of Pb 2+ . Clay fabric change was observed to be dispersed at low ionic strength and gradually attained aggregated face-to-face structures at high ionic strength. The simultaneous presence of other metals/salts strongly influenced Pb 2+ removal by BB, while divalent salt exhibited high suppression of adsorptive reaction at low concentrations. Sorption isotherm and kinetic modeling results indicated the possibility of chemisorption of Pb 2+ on BB. Based on the thermodynamic analysis, it was noted that Pb 2+ adsorption on BB is exothermic, spontaneous and adsorption reaction is less favorable at a higher temperature.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Miaomiao Han,Xiaosa Jin,Han Yang,Xiao Liu,Yadong Liu,Shengxiang Ji
Traditional cellulose-based chiral stationary phases (CSPs) are prepared by physically coating cellulose derivatives onto substrates and only compatible with a very limited range of solvents as the mobile phase. Therefore, chemical immobilization of cellulose derivatives onto silica gel has been efficiently applied to improve the solvent compatibility of cellulose-based CSPs. Here we developed a novel approach to homogeneously modifying cellulose tris(3,5-dimethylphenylcarbamate) (CDMPC). A series of carboxylic acid functionalized CDMPCs (CC-Xs) with controlled amounts and randomly distributed carboxylic acid groups was synthesized. CC-Xs were effectively immobilized onto amine-modified silica gel to afford immobilized CSPs. Compared to coated-type CSPs, immobilized CSPs significantly improved the solvent compatibility while maintaining similar chiral recognition abilities, but the introduction of excessive functional groups led to a deteriorated performance for columns. Moreover, a commercial drug, atenolol, was also sufficiently separated on the immobilized CSPs.
研究领域:
分析化学
·
有机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Man He,Hui Zhu,Guoren Li,Tao Duan,Jiehong Lei
Radioactive iodine (I₂) and methyl iodine (CH₃I), as common and dangerous volatile fission products in nuclear waste streams, pose a serious threat to the environment and human health due to their long-term radioactivity. Here, we aim to achieve effective co-capture of I₂ and CH₃I through the synthesis of a nitrogen-rich porous organic polymer (CTP-BPA) based on triazine through the Schiff base reaction. Various characterizations have confirmed that the material has a rich mesoporous structure and nitrogen active sites. The material exhibits excellent performance under both static and dynamic conditions: it can achieve a high equilibrium capacity (4996.5 mg/g for I₂ and 621.5 mg/g for CH₃I gas), and more importantly, in dynamic penetration experiments, it has significant absorption capacity (1052.3 mg/g for I₂ and 377.8 mg/g for CH₃I) at low concentrations (3.83 ppm for I₂ and 3.39 ppm for CH₃I). Crucially, CTP-BPA can still maintain its capturing effect in simulated harsh environments, resisting strong acids (1 M HNO₃), high temperatures (up to 500°C), and high humidity (80 % relative humidity). Comprehensive experiments and DFT theoretical analysis indicate that the high-density nitrogen active sites effectively activate and fix iodine through strong charge transfer interactions, thereby achieving the chemical sequestration of harmful iodine substances. This research provides a promising strategy and advanced materials for the safe and long-term management of radioactive iodine in environmental remediation.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Biao Wu,Meng Yan,Fen Luo,Xiaoyan Shu,Yi Liu,Guilin Wei,Zhentao Zhang,Yi Xie,Xirui Lu
Spent nuclear fuel contains 129 I, which has deleterious effects on human health. This study focused on the immobilization of iodine waste forms via a novel preparation method with B 2 O 3 –Bi 2 O 3 –ZnO–SiO 2 glass at 500–600 °C. The XRD results manifest that the sample with 30 wt % iodine sintered at 550 °C exhibits an obvious amorphous phase. The density of the samples with different iodine contents increases with the temperature increasing, so does the amorphous fraction except for 25 wt %. The FT-IR results reveal the matrix is mainly composed of [BO 3 ], [BO 4 ], [SiO 4 ], and [BiO 6 ]. TGA analysis shows high water content in the prepared samples. SEM-EDS results present that at 550 °C one part of the iodine is chemically immobilized into the glass matrix, and meanwhile, the other physically packed by the vitrified bulk. Our findings demonstrate the potential of the new preparation method for the disposal of iodine waste forms.
研究领域:
核废料管理
·
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Huimin Chen,Xin Li,Wenjiang Li,Aoao Lu,Chenguang Li,Qiang Li,Dabin Liu,Hongfei Ma,Binbin Wang
The safe long-term storage of nitrocellulose (NC) has become increasingly challenging under extreme environmental conditions due to accelerated NO x release, which promotes self-catalytic decomposition of NC. In this study, Tröger’s base (TB) was integrated into porous organic polymers (POPs) to achieve dual functionality: efficient physical adsorption and stable in-situ chemical fixation of NO x within confined pore spaces. Solid-state CP/MAS 13 C NMR spectroscopy and quantum chemical calculations were employed to confirm that NO x immobilization occurs preferentially at the ortho positions of tertiary amine moieties on aromatic rings. Among the synthesized materials, the polymer resulting from the Trögerization of the Tetrakis (4-aminophenyl) methane (TAPM-TB) was identified as the optimal adsorbent, characterized by accessible ortho-active sites, a microporous structure, and an exceptional NO x uptake capacity of 3.31 mmol/g under standard conditions. Furthermore, TAPM-TB was demonstrated to extend the stability time of NC by 3.23 times in methyl violet tests. These findings highlight a novel strategy for designing materials capable of simultaneous physical adsorption and stable chemical immobilization of NO x or other gases.
研究领域:
材料科学
·
环境化学
·
高分子化学
·
物理化学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·Vol. 17
·期 3
·1473-1481
·
IF 9.9
Ouyang Yue,Li Xiaoxiao,Zhu Jiexin,Zong Wei,Dai Yuhang,Gao Xuan,Zhang Wei,Yang Shengyuan,Bagherzadeh Roohollah,Lai Feili,Miao Yue-E.,Liu Tianxi
The shuttle effect induced by soluble lithium polysulfides (LiPSs) is known as one of the crucial issues that limit the practical applications of lithium-sulfur (Li-S) batteries. Herein, a titanium dioxide nanoparticle embedded in nitrogen-doped porous carbon nanofiber (TiO 2 @NCNF) composite is constructed via an interface-induced polymerization strategy to serve as an ideal sulfur host. Under the protection of the nanofiber walls, the uniformly dispersed TiO 2 nanocrystalline can act as capturing centers to constantly immobilize LiPSs towards durable sulfur chemistry. Besides, the mesoporous microstructure in the fibrous framework endows the TiO 2 @NCNF host with strong physical reservation for sulfur and LiPSs, sufficient pathways for electron/ion transfer, and excellent endurance for volume change. As expected, the sulfur-loaded TiO 2 @NCNF composite electrode presents a fabulous rate performance and long cycle lifespan (capacity fading rate of 0.062% per cycle over 500 cycles) at 2.0 C. Furthermore, the assembled Li-S batteries harvest superb areal capacity and cycling stability even under high sulfur loading and lean electrolyte conditions.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Ding Guo,Cheng Li,Juan Zhang,Genyan Liu,Xiaogang Luo,Fengshou Wu
The chemical fixation of carbon dioxide to afford value added chemicals under solvent free and ambient conditions has gained considerable attentions. In this work, we successfully synthesized the porphyrin-based porous organic framework (PPOPs) through Schiff base reaction using 5,10,15,20-tetra(4-aminbiphenyl) porphyrin (TAPP) and 4,4′-biphenyldicarbaldehyde (BDA) as starting materials, which was then coordinated with cobalt to yield related metal complex (Co-PPOPs). The chemical structure and morphology of Co-PPOPs were characterized by absorption spectrum , FT-IR, X-ray photoelectron spectra (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and nitrogen physisorption . Co-PPOPs showed excellent catalytic activity towards the conversion of carbon dioxide to cyclic carbonates under ambient conditions. Furthermore, Co-PPOPs was recovered easily and could be used repeatedly (more than five times) without losing any catalytic activity. Thus, the as-prepared Co-PPOPs was a promising heterogeneous catalyst for carbon dioxide conversion, providing high turnover number than the previously reported catalysts.
研究领域:
材料科学
·
催化
·
绿色化学
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）