Materials
·
2023
·Vol. 16
·期 7
·2650
·
IF 3.4
Yaohui Xu,Liangjuan Gao,Jinyuan Yang,Qingxiu Yang,Wanxin Peng,Zhao Ding
A porous CeO2was synthesized following the addition of guanidine carbonate to a Ce3+aqueous solution, the subsequent addition of hydrogen peroxide and a final hydrothermal treatment. The optimal experimental parameters for the synthesis of porous CeO2, including the amounts of guanidine carbonate and hydrogen peroxide and the hydrothermal conditions, were determined by taking the adsorption efficiency of acid orange 7 (AO7) dye as the evaluation. A template−free hydrothermal strategy could avoid the use of soft or hard templates and the subsequent tedious procedures of eliminating templates, which aligned with the goals of energy conservation and emission reduction. Moreover, both the guanidine carbonate and hydrogen peroxide used in this work were accessible and eco−friendly raw materials. The porous CeO2possessed rapid adsorption capacities for AO7 dye. When the initial concentration of AO7 was less than 130 mg/L, removal efficiencies greater than 90.0% were obtained, achieving a maximum value of 97.5% at [AO7] = 100 mg/L and [CeO2] = 2.0 g/L in the first 10 min of contact. Moreover, the adsorption–desorption equilibrium between the porous CeO2adsorbent and the AO7 molecule was basically established within the first 30 min. The saturated adsorption amount of AO7 dye was 90.3 mg/g based on a Langmuir linear fitting of the experimental data. Moreover, the porous CeO2could be recycled using a NaOH aqueous solution, and the adsorption efficiency of AO7 dye still remained above 92.5% after five cycles. This study provided an alternative porous adsorbent for the purification of dye wastewater, and a template−free hydrothermal strategy was developed to enable the design of CeO2−based catalysts or catalyst carriers.Keywords:porous CeO2;template−free;adsorption;adsorption efficiency;acid orange 7
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
CRYSTENGCOMM
·
2022
·Vol. 24
·期 22
·4013-4020
·
IF 3.756
Lang Sun,Xintong Xu,Dalin Sun,Shaowen Chu,Jiaqi Chen,Wentao Shi,Juan Lu,Shuangchen Ruan
Analcime (ANA) crystals have wide applications in the field of selective adsorption, nanoelectronics, light gas/hydrocarbon mixture separation, and radioactive element adsorbents. However, many organic templates were necessary to synthesize ANA crystals in previous work, causing significant environmental pollution and high cost. Thus, it is crucial to synthesize single ANA crystals under a simple system without the organic template. Herein, we explore the synthesis of large single ANA crystals (size up to 210 μm) in the template-free system of SiO2 : 0.274Al2O3 : 1.79Na2O : 190H2O at 180 °C for 40 h. The absence of expensive organic templates and hydrofluoric acid (HF) dramatically reduces the costs and pollution. This makes the method more conducive to mass production. Meanwhile, we report a series of growth conditions for ANA crystals with different sizes, which is more conducive for the preparation of the required ANA single crystals for different application scenarios.
研究领域:
材料科学
·
无机化学
·
纳米电子学
·
吸附分离技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Shichao Han,Pan Liu,Ye Ma,Qinming Wu,Xiangju Meng,Feng-Shou Xiao
Calcination-free fabrication of highly b-oriented silicalite-1 (S-1) zeolite films in the absence of organic structure-directing agents (OSDAs) is attractive but still challenging. Herein, for the first time, we show a novel route for calcination-free synthesis of a b-oriented S-1 zeolite film in the absence of OSDAs. The key to this success is a rational secondary growth of zeolite crystals on the surface of supports by avoidance of the formation of zeolite nuclei in the system due to the absence of OSDAs. Because of OSDA-free synthesis of S-1, it not only reduces the cost of zeolite films but also avoids the calcination of OSDAs in the synthesis, thus avoiding the formation of cracks in the zeolite films. In addition, the calcination-free fabrication is favorable for reduction of zeolite film defects such as a terminal OH group. As a result, the zeolite films obtained from this work exhibit higher hydrophobicity than the conventional one. Furthermore, the current polarization curve of this S-1 zeolite film shows excellent corrosion resistance. The aforementioned features would be potentially important for industrial application of zeolite films in the near future.
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
MATERIALS LETTERS
·
2020
·
IF 3.204
Yiming Lei,Jintang Zhou,Zhengjun Yao,Lin Li
Self-assembly porous polyaniline (PANI) microspheres were synthesized via template-free interfacial method at the interface of gallic acid aqueous solution and carbon tetrachloride. The morphology of PANI can be controlled by changing the content of gallic acid. The obtained porous PANI microspheres showed good electromagnetic (EM) wave absorption performance. The maximum reflection loss value of which is −26.5 dB and the effective absorption bandwidth (reflection loss <−10 dB) is about 4.1 GHz. This study is mainly focused on analyzing EM loss based on complex permittivity as the magnetic loss of PANI is neglectable. Further EM analysis indicated that porous PANI microspheres have better impedance matching and attenuation constant, which attributes to the good EM wave absorption. This work can act as a reference for designing PANI microspheres as EM wave absorber by the template-free process.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Zhichao Yu,Chonghe Xu,Kangkang Yuan,Xinzhu Gan,Haifeng Zhou,Xinqiang Wang,Luyi Zhu,Guanghui Zhang,Dong Xu
MgO mesoporous nanofibers were obtained by a template-free electrospinning method. The unique bumpy-structure was obtained on the surface of nanofibers that could enhance the surface area and provide more active sites for adsorption. The formation mechanism of the bumpy-structure has been investigated. The as-prepared MgO nanofibers with a high surface area of 194.17 m 2 g −1 exhibited excellent adsorption capacities for fluoride of 237.49 mg g −1 . Furthermore, the MgO nanofibers showed selective adsorption for different organic dyes and have superior adsorption capacity for Congo red (4802.27 mg g −1 ). The adsorption processes for both fluoride and Congo red were systematically investigated, which were found to follow the pseudo-second-order kinetic model. By comparison with the reported fabrication routes and adsorption capacities of mesoporous MgO, the synthesis process is simple, controllable and template-free, and the superior adsorption performance provided a potential adsorbent for the removal of fluoride and Congo red in wastewater treatment. The high surface area of the MgO mesoporous nanofibers might also promote its application in basic catalysis and other fields.
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 POROUS MATERIALS
·
2021
·Vol. 29
·期 2
·371-380
·
IF 2.496
Zhang Wei,Xue Haonan,Wang Min,Wu Zeying,Ding Linlin,Deng Yaoyao,Wang Wei,Wei Xuejiao,Zhang Zhenwei,Xiang Mei
Cu-containing Beta zeolites (Cu-Beta) are straightforwardly synthesized in a one-pot method without template, where the crucial step is the co-hydrolysis/condensation of silica source and copper salt at the moderate acidic condition. In the solvent-free oxidation of cyclohexane with molecular oxygen (O 2 ), the best cyclohexane conversion result (9.7%) with a KA-oil (cyclohexanone and cyclohexanol) selectivity of 94.1% is obtained over Cu-Beta(100). Structure—activity relationship analysis indicates that the isolated tetrahedral framework Cu 2+ species and chemisorption oxygen species in high concentration on the catalyst surface enhannce the catalic performance. In addition, the catalyst can be easily separated and still remain stable after recycling five times, providing new insights into catalysts design for the catalytic oxidation of cyclohexane to KA-oil.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 74
·46529-46535
·
IF 3.108
Hengfa Liu,Bentian Zhang,Wanping Li,Gao Cheng,Jiaxi Han,Bang Lan,Ming Sun,Lin Yu
Hierarchical pine tree-like α-MnO2 architectures are prepared by a facile one-step method without any template. The hierarchical α-MnO2 is composed of branched α-MnO2 short nanorods assembled onto the backbone of an α-MnO2 long nanowire. Time-dependent experiment shows that the growth process of the branched α-MnO2 nanostructures is the formation of β-MnOOH and then the transformation to a α-MnO2 branched structure in a step by step manner. Owing to its specific structure features, the hierarchical pine tree-like α-MnO2 exhibits superior catalytic performance in the catalytic combustion of dimethyl ether with a light-off temperature (T10) at 169 °C and a complete conversion temperature (T90) of 235 °C, which is far better than commercial MnO2.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 9
·1390
·
IF 5.719
Heng Wang,Guo-Min Li,Bing Li,Jing-Lin You
Aluminum nanowires with irregular morphologies were prepared by template-free electrodeposition from a room-temperature chloroaluminate ionic liquid. The effects of the diffusion condition and deposition potential on the morphologies of Al nanowires were investigated. The decrease of diffusion flux leads to the formation of particular segmented morphologies of Al nanowires. A dynamic equilibrium between the electrochemical reaction and the diffusion of Al2Cl7−results in the current fluctuation and the periodical variation of diameters in the Al nanowires growth period. Al nanowires with several kinds of morphologies can be controllably electrodeposited under a restricted diffusion condition, without using a template. Increasing the overpotential shows the similar influence on the morphology of Al nanowires as the decrease in diffusion flux under the restricted diffusion condition. Most of the segmented Al nanowires have a single crystalline structure and grow in the [100] orientation. This work also provides a new strategy for the fabrication of nanowires with highly controllable irregular morphologies.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 33
·5595-5600
·
IF 3.545
Ji Ping Zhu,Xue Feng Wu,Xiao Hua Yang,Peng Fei Liu,Sheng Dai,Hua Gui Yang
Mesoporous single crystals have attracted considerable attention owing to their wide applications in (photo)catalysis, photovoltaics, and numerous other electrical energy conversion and storage technologies. Here, by using low-valent Ti3+ precursors, we have successfully synthesized well-defined mesoporous single-crystal strontium titanate (MSC SrTiO3) without a template via a facile hydrothermal method. The BET surface area and average pore diameter of MSC SrTiO3 are 18.6 m2 g−1 and 22 nm, respectively. Moreover, the as-synthesized MSC SrTiO3 features abundant oxygen vacancies. By using time-dependent structural and morphological characterizations, a hypothetical crystal growth mechanism was proposed.
研究领域:
材料科学
·
纳米技术
·
催化
·
光伏
·
电能转换与存储
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Cailang Lu,Qian Jia,Linlin Yu,Bin Zhang,Ruoyu Chen
Silica nanotubes have significant applications in various fields, including thermal insulation, self-cleaning, and catalysis. Currently, the synthesis methods of silica nanotubes are mostly limited to the template method. In this work, a template-free strategy and vapor-phase approach were used to prepare silica nanotubes. Poly(methylhydrosiloxane) (PMHS) was hydrolyzed and condensed in a high-temperature closed reactor by using ammonia as a catalyst. The resulting product was then subjected to template-free self-assembly to synthesize silica nanotubes incorporating methyl groups. The silica nanotubes were synthesized under varying conditions, resulting in lengths ranging from 50 nm to several micrometers, exterior diameters between 40 and 120 nm, and wall thicknesses varying from 7 to 30 nm. The synthesized products underwent morphology analysis using TEM and FESEM for morphology analysis, elemental composition analysis using XPS, and chemical structure identification using FTIR, and the possible formation mechanism of silica nanotubes formation was also speculated. Furthermore, the coatings formed by silica nanotubes exhibited remarkable superhydrophobic self-cleaning properties with a water contact angle of 162° and a rolling angle of less than 1°.
研究领域:
材料科学
·
化学工程
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Feng Ye,Shuanshi Fan,Yanhong Wang,Xuemei Lang,Yihui Lv,Weibo Chen,Gang Li
The facile synthesis of hierarchical ZSM-5 zeolites without mesoporogens is highly desirable for industrial applications. In this study, hierarchical ZSM-5 zeolites with abundant mesopores and a nearly single-crystalline structure were rapidly synthesized in a mesoporogen-free system. Under conventional heating, the synthesis time was significantly reduced to just 15 min, significantly improving production efficiency. The key to this ultrafast process was the use of a tubular reactor, combined with the strategic selection of silicon and aluminum sources.
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
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Qi Zhang,Bohan Cao,Mingxuan Fu,Yuexian Liu,Haiyang Wang,Xinyu Fan,Haijun Lu,Yufan Zhang,Huan Wang
In this work, spherical, flower and urchin–like platinum nanoparticles (PtNSs, PtNFs, PtNUs) decorated ordered mesoporous carbon (OMC) architecture were synthesized through a facile strategy without any template, surfactant and stabilizer. The different morphologies can be controlled by simple adjusting the proportion of precursor K 2 PtCl 4 , HCOOH and OMC at room temperature , this both simplifies the synthesis procedure and permits good mixing, with better interfacing between the two nanophases of K 2 PtCl 4 and OMC. The formation mechanism of PtNUs, PtNFs and PtNSs decorated OMC (OMC–PtNUs, OMC–PtNFs and OMC–PtNSs) was deeply researched. The novel structure has the potential to possess high Pt utilization, high Pt activity surface and high specific surface area of OMC, which enables the excellent electrochemical sensing performance. Paracetamol (AP), methanol and glucose were employed as redox probes to study the electrocatalytic performance, which shows favorable electron–transfer kinetics. The novel structure should be a good model for constructing a promising electrochemical sensing platform for further research in pharmaceutical preparations and in biological fluids.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）