The Comparative Study of Pure Mesoporous Silica SBA-15 and CPTMS-SBA-15 Adsorption of Pb Heavy Metal

Mesoporous silica SBA-15 has been successfully synthesized and its surface has been modified/functionalized with CPTMS. The making of pure SBA-15 was operated at an optimized concentration of Pluronic 123 surfactant at 60 mM which yields surface area of 831.996 m2/g determined by BET. The modified SBA-15, SBA-15+CPTMS have a lower surface area in comparison with neat SBA-15. In this study, SBA-15+CPTMS have a surface area of about 711.061 m2/g. This very high surface area was utilized to remove the Pb in industrial wastewater using laboratory made water samples. Despite lower surface area and pore diameter of SBA-15+CPTMS in comparison with pure SBA-15, the effectivity of SBA-15+CPTMS in lead adsorption much higher than mesoporous silica SBA-15 especially at a lower concentration of adsorbents. In this paper, we compared the percentage of Pb removal using mesoporous silica SBA-15 and CPTMS-SBA-15 systems. It was found at a low concentration of adsorbent, CPTMS-SBA-15 yields three times percentage of Pb removal than pure SBA-15. However, at high concentration of adsorbent, CPTMS-SBA-15 percentage of Pb removal is just slightly higher than the pure SBA-15 percentage of Pb removal.

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Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

10.26434/chemrxiv.7770338.v1 ◽

2019 ◽

Cited By ~ 1

Author(s):

Kailun Yang ◽

Recep Kas ◽

Wilson A. Smith

Keyword(s):

Surface Area ◽

High Surface ◽

High Surface Area ◽

Catalyst Layer ◽

Active Surface ◽

Active Surface Area ◽

High Concentration ◽

Copper Electrodes ◽

Surface Enhanced ◽

Local Current

This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO2 electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO2 electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO2 electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer.

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Triple Surfactant Assisted Synthesis of Novel Core-shell Mesoporous Silica Nanoparticles with High Surface Area for Drug Delivery for the Prostate Cancer

Bulletin of the Chemical Society of Japan ◽

10.1246/bcsj.20210428 ◽

2022 ◽

Author(s):

Steffi Tiburcius ◽

Kannan Krishnan ◽

Vaishwik Patel ◽

Jacob Netherton ◽

C.I. Sathish ◽

...

Keyword(s):

Prostate Cancer ◽

Drug Delivery ◽

Mesoporous Silica ◽

Silica Nanoparticles ◽

Surface Area ◽

Mesoporous Silica Nanoparticles ◽

High Surface ◽

High Surface Area ◽

Core Shell ◽

Surfactant Assisted

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Recovery of high surface area mesoporous silica from waste hexafluorosilicic acid (H2SiF6) of fertilizer industry

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2009.08.125 ◽

2010 ◽

Vol 173 (1-3) ◽

pp. 576-580 ◽

Cited By ~ 25

Author(s):

Pradip B. Sarawade ◽

Jong-Kil Kim ◽

Askwar Hilonga ◽

Hee Taik Kim

Keyword(s):

Mesoporous Silica ◽

Surface Area ◽

High Surface ◽

High Surface Area ◽

Fertilizer Industry

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Synthesis and CO Oxidation Catalytic Character of High Surface Area Ruthenium Dioxide Replicated by Cubic Mesoporous Silica

Chemistry Letters ◽

10.1246/cl.2005.390 ◽

2005 ◽

Vol 34 (3) ◽

pp. 390-391 ◽

Cited By ~ 21

Author(s):

Weihua Shen ◽

Jianlin Shi ◽

Hangrong Chen ◽

Jinlou Gu ◽

Yufang Zhu ◽

...

Keyword(s):

Mesoporous Silica ◽

Co Oxidation ◽

Surface Area ◽

High Surface ◽

High Surface Area ◽

Ruthenium Dioxide ◽

Cubic Mesoporous

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HSA-Cercanam®: A New Material with a Continuous Nanopore Network

MRS Proceedings ◽

10.1557/proc-788-l4.2 ◽

2003 ◽

Vol 788 ◽

Author(s):

A. Akash ◽

B. Nair ◽

K. Minnick ◽

M. Wilson ◽

J. Hartvigsen

Keyword(s):

Surface Area ◽

High Surface ◽

High Surface Area ◽

Unique Nature ◽

Catalyst Type ◽

Reaction Chambers ◽

New Material ◽

One Step ◽

Very High ◽

Functional Ceramic

ABSTRACTA novel nano-ceramic material, called HSA-CERCANAM®, which has a very high surface area with a nanopore network has been developed. HSA-CERCANAM® can be casted in various shapes and forms resulting in a monolithic piece that has surface area as high as 80–100 m2/g. The surface area and the nanopore network of HSA-CERCANAM® remains stable at temperatures as high as 1000°C. Furthermore, the unique nature of HSA-CERCANAM® allows it to be casted on and around features, either sacrificial or permanent. Using sacrificial features, microchannels can be incorporated internally into the monolithic HSA-CERCANAM® piece in a simple, one-step process. Further, this monolithic ceramic component, which has an intrinsically high surface area and a nanopore network, can be infiltrated with a desired catalyst. This could offer clear technological advantages over currently available microreactors. The surface area, porosity, catalyst type and infiltration levels are some of the ways in which tailored microstructures can be realized in components such as mixers, heat exchangers, extractors, filters or reaction chambers thereby leading to highly efficient, multi-functional ceramic micro-devices.

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Photoreforming of Glucose over CuO/TiO2

Catalysts ◽

10.3390/catal10050477 ◽

2020 ◽

Vol 10 (5) ◽

pp. 477 ◽

Cited By ~ 2

Author(s):

Elnaz Bahadori ◽

Gianguido Ramis ◽

Danny Zanardo ◽

Federica Menegazzo ◽

Michela Signoretto ◽

...

Keyword(s):

Hydrogen Production ◽

Economic Analysis ◽

Surface Area ◽

High Surface ◽

High Surface Area ◽

Lower Surface ◽

Flame Synthesis ◽

Biomass Hydrolysis ◽

Model Molecule

Hydrogen production has been investigated through the photoreforming of glucose, as model molecule representative for biomass hydrolysis. Different copper- or nickel-loaded titania photocatalysts have been compared. The samples were prepared starting from three titania samples, prepared by precipitation and characterized by pure Anatase with high surface area, or prepared through flame synthesis, i.e., flame pyrolysis and the commercial P25, leading to mixed Rutile and Anatase phases with lower surface area. The metal was added in different loading up to 1 wt % following three procedures that induced different dispersion and reducibility to the catalyst. The highest activity among the bare semiconductors was exhibited by the commercial P25 titania, while the addition of 1 wt % CuO through precipitation with complexes led to the best hydrogen productivity, i.e., 9.7 mol H2/h kgcat. Finally, a basic economic analysis considering only the costs of the catalyst and testing was performed, suggesting CuO promoted samples as promising and almost feasible for this application.

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