Various Morphology of Hierarchical Pore-Structured Compound: MCM-41/Diatomite and its Adsorption Behavior for Methylene Blue

2013 ◽  
Vol 690-693 ◽  
pp. 3533-3540
Author(s):  
Fang Fei Li ◽  
Mao Sheng Xia ◽  
Yin Shan Jiang
Keyword(s):  
Hierarchical Structure ◽  
Catalyst Support ◽  
Nitrogen Adsorption ◽  
High Specific Surface Area ◽  
Sem Analysis ◽  
Structure And Morphology ◽  
Hierarchical Porous ◽  
Hierarchical Pore ◽  
Adsorption Desorption ◽  
Mcm 41

Hierarchical porous materials attract considerable attentions due to their interesting structures and superior adsorption capabilities. In this work, a novel macro- and meso-porous hierarchical material, MCM-41/diatomite, has successfully been synthesized from natural diatomite and tetraethoxysilane by basic hydrothermal method. Nitrogen adsorption/desorption isotherms, low angle XRD and SEM analysis were carried out to character the multiple porous structure and morphology of MCM-41/diatomite. The resultant compound displayed high specific surface area (862~1041 m2/g) and macro-meso-porous hierarchical structure. The morphology of MCM-41/diatomite could be various, such as worm-like, grape-like, flocky, and acaleph-like, due to different ratio between TEOS, PEG, and NaOH. Moreover, the results of adsorption experiments show that some of the resultant MCM-41/diatomite display stronger adsorption capabilities than simply mesoporous MCM-41, due to the macro-meso-porous hierarchical structure, which would further extend the application of MCM-41/diatomite as adsorbent and catalyst support.

Rapid Synthesis of MCM-41 from Rice Husk Using Ultrasonic Wave: Optimation of Sonication Time

2019 ◽  
Vol 948 ◽  
pp. 198-205
Author(s):  
Suyanta Suyanta ◽  
Eko Sri Kunarti ◽  
Bambang Rusdiarso ◽  
Dritta Anies Cahaya ◽  
Efa Radnawati ◽  
...  
Keyword(s):  
Optimum Condition ◽  
Ultrasonic Wave ◽  
Rice Husk ◽  
Nitrogen Adsorption ◽  
Sonication Time ◽  
Ultrasound Waves ◽  
Comb Structure ◽  
Silica Source ◽  
Adsorption Desorption ◽  
Mcm 41

Ultrasound waves with 48 KHz of frequency were applied for the synthesis of MCM-41 using rice husk as the silica source. The effect of sonication time (30, 60, 90, 120, 150, 180, and 210 min) on the crystallinity of calcined MCM-41 was investigated. Characterization using XRD and FTIR indicated that the ordered structure of MCM-41 could be synthesized by ultrasonic wave. Sonication time at 150 min was found to be the optimum condition. The nitrogen adsorption-desorption isotherms informed that the mesoporous material produced at the optimum condition has 794.73 m2·g-1of surface area, 3.02 nm of BJH pore diameter, 1.17 nm of wall thickness, and 0.68 ml·g-1 of pore volume. While based on the TEM image, the material has hexagonal or a honey-comb structure.

Catalytic Activity of Argentum-loaded MCM-41 for Ozonation of p- Chlorobenzoic Acid (p-CBA) in Aqueous Solution

2015 ◽  
Vol 18 (1) ◽  
Author(s):  
Zhaoqi Pan ◽  
Junyu Zeng ◽  
Bingyan Lan ◽  
Laisheng Li
Keyword(s):  
Aqueous Solution ◽  
Nitrogen Adsorption ◽  
Hexagonal Structure ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Chlorobenzoic Acid ◽  
Transmission Electron ◽  
Initial Ph ◽  
Adsorption Desorption ◽  
Mcm 41

AbstractArgentum-loaded MCM-41 (Ag/MCM-41) was synthesized successfully by a hydrothermal method and used as a catalyst for the ozonation of p-chlorobenzoic acid (p-CBA) in aqueous solution. Ag/MCM-41 was characterized by low angle X-ray diffraction (XRD), nitrogen adsorption-desorption and transmission electron microscopy (TEM). Characterizations suggest that the prepared samples retained a highly regulated mesopores of hexagonal structure and a high BET surface area. The influences of argentum content, initial pH, reaction temperature on the catalytic ozonation were also evaluated. Ag/MCM-41/O

Synthesis and Characterization of Mesoporous Molecular Sieve Al-MCM-41 Using Kaolin as Raw Material

2013 ◽  
Vol 779-780 ◽  
pp. 201-204
Author(s):  
Miao Li ◽  
Hong Wang ◽  
Xian Qing Li ◽  
Jin Rong Liu
Keyword(s):  
Molecular Sieve ◽  
Nitrogen Adsorption ◽  
Mesoporous Molecular Sieve ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Adsorption Desorption ◽  
Calcined Kaolin ◽  
Mcm 41

Ordered hexagonally mesoporous molecular sieve Al-MCM-41 with Si/Al (atom) ratio=9 was prepared by hydrothermal synthesis using raw kaolin. X-ray diffraction (XRD), Nitrogen adsorption desorption, Transmission Electron Microscope (TEM) and Energy Dispersive X-ray Detector (EDX) were employed to characterise raw kaolin, calcined kaolin, as-synthesized and calcined Al-MCM-41. The results indicated that characteristic reflections of raw kaolin disappeared after calcination, both of as-synthesized and calcined Al-MCM-41 exhibited well ordered hexagonally mesoporous molecular sieve structure.

scholarly journals Synthesis and Properties of Magnetic Carbon Nanocages Particles for Dye Removal

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Hengfei Qin ◽  
Yongkui Huang ◽  
Siyu Liu ◽  
Yao Fang ◽  
Xi Li ◽  
...  
Keyword(s):  
Raman Spectrum ◽  
Textile Wastewater ◽  
Nitrogen Adsorption ◽  
Cage Structure ◽  
X Ray ◽  
Transmission Electron ◽  
Magnetic Carbon ◽  
Hierarchical Pore ◽  
Adsorption Desorption ◽  
High Degree

Magnetic carbon nanocages (MCNCs) with multiform pore structure have been synthesized by a simple low temperature carbonization process. Biorenewable lignin was used as a cheap and carbon-rich precursor for the first time. The products were characterized by X-ray diffraction (XRD), nitrogen adsorption-desorption, energy dispersive X-ray spectroscopy (EDS), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), and Raman spectrum. XRD pattern and Raman spectrum showed that the product has a high degree of graphitization crystallinity. TEM micrograph indicated that the synthesized MCNCs have the hierarchical pore and cage structure. Due to these characteristics, the obtained magnetic carbon nanocages can be used as efficient and recycled adsorbents in the removal of dye staff from textile wastewater.

scholarly journals One-step synthesis of zinc-encapsulated MCM-41 as H2S adsorbent and optimization of adsorption parameters

2020 ◽  
Vol 3 (02) ◽  
pp. 74-81
Author(s):  
Nastaran Hazrati ◽  
Ali Akbar Miran Beigi ◽  
Majid Abdouss ◽  
Amir Vahid
Keyword(s):  
Pore Diameter ◽  
High Specific Surface Area ◽  
Adsorption Parameters ◽  
N2 Adsorption ◽  
Structure Directing Agent ◽  
Functionalized Mesoporous Silica ◽  
One Step ◽  
Ammonia Aqueous Solution ◽  
Adsorption Desorption ◽  
Mcm 41

The nano-sized structure of well-ordered Zn@MCM-41 adsorbent was synthesized through a direct hydrothermal method using CTAB as a structure-directing agent in an ammonia aqueous solution with different amounts of zinc acetylacetonate which were inserted into the structure-directing agent's loop during the synthesis. The XRD, HRTEM, and N2 adsorption-desorption isotherms were used to characterize the prepared ZnO functionalized mesoporous silica samples. As a result, the presence of ZnO in highly-ordered MCM-41's pore was proved as well as maintenance of the ordered mesostructure of MCM-41. The materials were possessed with a high specific surface area (1114-509 m2.g-1) and a large pore diameter (4.03-3.27 nm). Based on the obtained results from the adsorption of H2S gas in a lab-made setup, the Znx@MCM-41 showed the superior ability to increase of ZnO amount up to 7 hours as a breakthrough point. 

scholarly journals Glycerol Acetylation with Propionic Acid Using Iron and Cobalt Oxides in Al-MCM-41 Catalysts

2020 ◽  
Vol 15 (3) ◽  
pp. 829-844
Author(s):  
Fabio Ribeiro Tentor ◽  
Diego Borelli Dias ◽  
Mateus Rosolen Gomes ◽  
João Guilherme Pereira Vicente ◽  
Lúcio Cardozo-Filho ◽  
...  
Keyword(s):  
Propionic Acid ◽  
Molecular Sieves ◽  
Sem Analysis ◽  
Cobalt Oxides ◽  
Glycerol Conversion ◽  
X Ray ◽  
Acid Ratio ◽  
Acidic Sites ◽  
Adsorption Desorption ◽  
Mcm 41

In this work, Al-MCM-41 molecular sieves were synthesized, containing iron and/or cobalt oxides, impregnated by incipient wetness method, characterized and applied as catalysts in the acetylation reaction of glycerol with propionic acid to produce green glyceryl propionate molecules of high commercial value. According to this, X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Fourier Transform Infra Red (FT-IR), adsorption/desorption N2 isotherms, textural analysis, and Scanning Electron Microscope (SEM) analysis were recorded to evaluate the main characteristics of materials. The presence of Lewis and Brønsted acidic sites and catalysts surface area were observed as important key points to functionalize acetylation reaction. Thus, time reaction, temperature, and glycerol / propionic acid ratio varied to improve the most suitable reaction conditions and behaviors. As a result, glycerol conversion was above 96%, followed by 68% of selectivity to glyceryl monopropionate as well as the formation of glyceryl di- and tri- propionate and a small amount of ethylene glycol dipropionate as an undesired product.  Copyright © 2020 BCREC Group. All rights reserved 

Mask-painting symmetrical micro-supercapacitors based on scalable, pore size adjustable, N-doped hierarchical porous carbon

2021 ◽  
Author(s):  
Shijin Zhu ◽  
Michael Göbel ◽  
Petr Formanek ◽  
Frank Simon ◽  
Michael Sommer ◽  
...  
Keyword(s):  
Energy Storage ◽  
Rate Capability ◽  
High Specific Surface Area ◽  
High Rate ◽  
Hierarchical Porous Carbon ◽  
High Rate Capability ◽  
Hierarchical Pore Structure ◽  
Hierarchical Porous ◽  
Energy Storage Applications ◽  
Hierarchical Pore

High specific surface area carbons with hierarchical pore structure and outstanding conductivity have gained tremendous attention for energy storage applications due to their stable electrochemical properties and high rate capability....

scholarly journals CTAB-Assisted Hydrothermal Synthesis of WO3Hierarchical Porous Structures and Investigation of Their Sensing Properties

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Dan Meng ◽  
Guosheng Wang ◽  
Xiaoguang San ◽  
Yanbai Shen ◽  
Guodong Zhao ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Nitrogen Adsorption ◽  
Fast Response ◽  
Photoelectron Spectra ◽  
Porous Structures ◽  
X Ray ◽  
Transmission Electron ◽  
Hierarchical Porous ◽  
Adsorption Desorption ◽  
Higher Sensitivity

WO3hierarchical porous structures were successfully synthesized via cetyltrimethylammonium bromide- (CTAB-) assisted hydrothermal method. The structure and morphology were investigated using scanning electron microscope, X-ray diffractometer, transmission electron microscopy, X-ray photoelectron spectra, Brunauer-Emmett-Teller nitrogen adsorption-desorption, and thermogravimetry and differential thermal analysis. The result demonstrated that WO3hierarchical porous structures with an orthorhombic structure were constructed by a number of nanoparticles about 50–100 nm in diameters. The H2gas sensing measurements showed that well-defined WO3hierarchical porous structures with a large specific surface area exhibited the higher sensitivity compared with products without CTAB at all operating temperatures. Moreover, the reversible and fast response to H2gas and good selectivity were obtained. The results indicated that the WO3hierarchical porous structures are promising materials for gas sensors.

scholarly journals Influence of synthesis conditions on morphological features of the SBA-15 containing only elongated and rounded/spherical grains

2018 ◽  
Vol 50 (1) ◽  
pp. 111-121
Author(s):  
Maja Kokunesoski ◽  
Zvezdana Bascarevic ◽  
Zlatko Rakocevic ◽  
Aleksandra Saponjic ◽  
Djordje Saponjic ◽  
...  
Keyword(s):  
Spherical Shape ◽  
Nitrogen Adsorption ◽  
High Specific Surface Area ◽  
Sem Analysis ◽  
Morphological Features ◽  
Synthesis Conditions ◽  
Pluronic P123 ◽  
Afm Analysis ◽  
Lower Temperature ◽  
Time Of Reaction

Mesoporous silica SBA-15 materials of high specific surface area (~700 m2 g?1) were synthesized by using block copolymer Pluronic P123 as template and tetraethoxysilane as silica source. The obtained materials were characterized by XRD, nitrogen adsorption - desorption measurements, SEM, EDS and AFM analysis. It was found that small modifications of synthesis conditions influenced the morphological features of the synthesized SBA-15 samples. The SEM analysis had shown that the SBA-15 synthesized at lower temperature and longer time of reaction (80?C, 48 h) provided elongated rod-shaped grains about 1?m long. The other sample synthesized at higher temperature and shorter time of reaction (100 ?C, 24 h) had rounded grains and grains of regular spherical shape with diameters ranging from 0.5 to 2 ?m. The EDS analysis confirmed that the particles of both synthesized samples were of the SiO2 content. In addition, the AFM analysis had shown different surface morphologies of the materials synthesized under various conditions.

Microwave-assisted immobilization of metallophthalocyanines in mesoporous channels of MCM-41

2007 ◽  
Vol 11 (02) ◽  
pp. 118-124 ◽  
Author(s):  
Mahtab Pirouzmand ◽  
Mostafa M. Amini ◽  
Nasser Safari
Keyword(s):  
Microwave Irradiation ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Solvent Free Conditions ◽  
Short Period ◽  
Vis Spectroscopy ◽  
Adsorption Desorption ◽  
Mcm 41

Metallophthalocyanines have been assembled in MCM-41 channels by microwave irradiation of a mixture of ion-exchanged MCM-41, and 1,2-dicyanobenzene under solvent-free conditions in a considerably short period of time. The prepared materials have been characterized by diffuse reflectance UV-vis spectroscopy, X-ray powder diffraction XRD, differential scanning calorimetry DSC, and Brunauer-Emmett-Teller BET nitrogen adsorption desorption techniques. The X-ray diffraction and Brunauer-Emmett-Teller results showed that the textural properties of MCM-41 were preserved during microwave irradiation.

Sign in / Sign up

Export Citation Format

Share Document