Synthesis of mesoporous silica with different pore sizes for cellulase immobilization: pure physical adsorption

2017 ◽  
Vol 41 (17) ◽  
pp. 9338-9345 ◽  
Author(s):  
Baiyi Chen ◽  
Jianhui Qiu ◽  
Haodao Mo ◽  
Yanling Yu ◽  
Kazushi Ito ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Adsorption Mechanism ◽  
Physical Adsorption ◽  
Pore Sizes

The microstructure of mesoporous silica and their adsorbing cellulase process have been analyzed to investigating the physical adsorption mechanism.

scholarly journals Research on Organic Nanopore Adsorption Mechanism and Influencing Factors of Shale Oil Reservoirs

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Yanfeng He ◽  
Guodong Qi ◽  
Xiangji Dou ◽  
Run Duan ◽  
Nan Pan ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Pore Size ◽  
Adsorption Mechanism ◽  
Molecular Model ◽  
Physical Adsorption ◽  
Heat Of Adsorption ◽  
Competitive Sorption ◽  
Shale Oil ◽  
Pore Sizes ◽  
Adsorption Quantity

The adsorption properties of shale oil are of great significance to the development of shale oil resources. This study is aimed at understanding the microscopic adsorption mechanism of shale oil in organic nanopores. Thus, a molecular model of organic micropore walls and multicomponent fluids of CO2, C4H10, C8H18, and C12H26 is constructed to investigate the adsorption pattern of multicomponent fluids in organic nanopores under different temperature and pore size conditions. The quantity and heat of adsorption are simulated with the Monte Carlo method, which has been used in previous studies for single-or two-component fluids. The results demonstrate that the ability of CO2 to displace various alkanes is different. Specifically, medium-chain n-alkanes are slightly weaker than light alkanes in competitive sorption, and long-chain n-alkanes are less conducive to competitive sorption. The higher the CO2 sorption ratio, the more the sorption sites occupied by CO2. Thus, it is the best replacement for shale oil. The adsorption quantity of carbon dioxide, n-butane, and n-octane in organic nanopores first increases and then decreases as temperature rises. Meanwhile, the adsorption quantity of n-dodecane decreases firstly and then increases. With the increase in the pore size, the adsorption quantity of carbon dioxide, n-butane, and n-octane in organic nanopores increases while the adsorption quantity of n-dodecane first increases and then decreases. Besides, the model with larger pore sizes is more sensitive to pressure changes in the adsorption of carbon dioxide and n-butane than the model with smaller pore sizes. The heat of adsorption is CO2, C12H26, C8H18, and C4H10 in descending order. All are physical adsorption. Moreover, the adsorption quantity of all four components mixed fluid in the organic matter nanopores is positively correlated with the heat of adsorption.

Immobilization of lipase into mesoporous silica particles by physical adsorption

2009 ◽  
Vol 27 (4) ◽  
pp. 254-262 ◽  
Author(s):  
Milan Nikolić ◽  
Vladimir Srdić ◽  
Mirjana Antov
Keyword(s):  
Mesoporous Silica ◽  
Physical Adsorption ◽  
Silica Particles

The effect of blob size in polymer networks on nanoparticle-mediated adhesion of hydrogels

Soft Matter ◽  
2019 ◽  
Vol 15 (48) ◽  
pp. 9942-9948
Author(s):  
Sohyun Kim ◽  
Tae Hui Kang ◽  
Gi-Ra Yi
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Pore Diameter ◽  
Physical Adsorption ◽  
Mesoporous Silica Nanoparticles ◽  
Polymer Networks ◽  
Mesh Size ◽  
Adhesion Energy ◽  
Polymer Chains

Mesoporous silica nanoparticles can be used as an adhesive for hydrogels due to their physical adsorption to polymer chains, in which adhesion energy can be affected by the ratio of mesh size and pore diameter.

Comparison of Co(ii) adsorption by a crosslinked carboxymethyl chitosan hydrogel and resin: behaviour and mechanism

2017 ◽  
Vol 41 (9) ◽  
pp. 3487-3497 ◽  
Author(s):  
Wenqiang Luo ◽  
Zhishan Bai ◽  
Yong Zhu
Keyword(s):  
Adsorption Mechanism ◽  
Physical Adsorption ◽  
Carboxymethyl Chitosan ◽  
Chitosan Hydrogel

This article studies the possible chemical and physical adsorption mechanism for Co(ii) onto the crosslinked carboxymethyl chitosan hydrogel and resin.

The Adsorption Behavior of Modified Peanut Shells for Cr (VI)

2013 ◽  
Vol 781-784 ◽  
pp. 2189-2194
Author(s):  
Yi Hua Jiang ◽  
Xin Long Jiang
Keyword(s):  
Adsorption Mechanism ◽  
Physical Adsorption ◽  
Peanut Shell ◽  
Chemical Adsorption ◽  
Chemical Methods ◽  
Ir Spectrometry ◽  
Freundlich Isotherms ◽  
Reduction Processes ◽  
Peanut Shells ◽  
Adsorption Activation Energy

The adsorption of Cr(VI) by modified peanut shell has been investigated using chemical methods and IR spectrometry. The optimal condition for the adsorption of Cr(VI) by modified peanut shell is at 308 K and pH = 1.0, which gives a static saturated adsorption capacity of 14.15 mg·g-1, an apparent adsorption rate constant of k298 = 2.43 × 10-4 s-1, and an apparent adsorption activation energy of 10.58 kJ·mol-1. The adsorption follows the Langmuir and Freundlich isotherms and the liquid film diffusion is the controlling process of the adsorption. The adsorption thermodynamic parameters are ΔH = 125.58 kJ·mol-1, ΔS = 0.473 9 kJ·mol-1·K-1, ΔG = -17.81– -27.27 kJ·mol-1. Small amount of desorption is observed only at pH > 11. Adsorption mechanism of modified peanut shells for Cr(VI) was both physical adsorption and chemical adsorption of adsorbent "adsorption-oxidation and reduction processes".

Surface and Electrochemical Studies of Thin Film Diamond

2006 ◽  
Vol 956 ◽  
Author(s):  
John Foord ◽  
David Opperman
Keyword(s):  
Adsorption Mechanism ◽  
Physical Adsorption ◽  
Aqueous Media ◽  
Electrochemical Studies ◽  
Power Ultrasound ◽  
Diamond Electrode ◽  
Adsorption Processes ◽  
Electrode Interface ◽  
Protein Bovine Serum Albumin ◽  
Positively Charged

ABSTRACTThe behavior of diamond electrodes for electrochemical applications in aqueous media containing the protein bovine serum albumin has been explored, to examine the degree of electrode poisoning which occurs. Although the diamond electrode retains good activity in such solutions, electrode fouling is found at long contact times due to protein adsorption. Two adsorption processes are observed. The first is a simple physical adsorption mechanism, and can be simply reversed by washing the electrode in water. The second mechanism is only observed when negative potentials are applied to the diamond electrode and is attributed to the attraction and reaction of the positively charged protein at the electrode interface. Electrode poisoning is also observed in the presence of power ultrasound, although the electrochemical signals are usefully enhanced under these conditions due to enhanced mass transport to the electrode surface.

scholarly journals A Comparison Study of Mechanism: Cu2+Adsorption on Different Adsorbents and Their Surface-Modified Adsorbents

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Yaqin Yu ◽  
Xinrui Li ◽  
Jiemin Cheng
Keyword(s):  
Carbon Black ◽  
Adsorption Mechanism ◽  
Environmental Fate ◽  
Physical Adsorption ◽  
Hexadecyltrimethylammonium Bromide ◽  
Significant Implication ◽  
Isothermal Adsorption ◽  
Oxidized Carbon ◽  
Modified Adsorbents ◽  
Organic Bentonite

The isothermal adsorption kinetics of Cu2+onto Carbon Black (CB) and Oxidized Carbon Black (OCB) were studied under different solution conditions and compared with bentonite and organic bentonite with the hexadecyltrimethylammonium bromide (HDTMA). The adsorption capacities followed the order of OCB > CB > organic bentonite > bentonite, which was consistent with the orders of their surface roughness and specific surface area. The Fourier transmission infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscope (TEM) were used to explore the adsorption mechanism at molecular level. The adsorption process onto CB was physical adsorption. However, with the increase of oxygen-containing functional groups (C=O, C-O, and CNO), the chelation adsorption onto OCB became gradually dominant except physical adsorption. The ion exchange adsorption was the major adsorption mechanism of bentonite. The compounds were introduced into clay interlayer by complexing reaction with Cu2+, which improved the adsorption capacity of organic bentonite. The results present a significant implication for the environmental fate assessment of heavy metal pollution.

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