Synergistic Effect between Defect Sites and Functional Groups on the Hydrolysis of Cellulose over Activated Carbon

ChemSusChem ◽  
2014 ◽  
Vol 8 (3) ◽  
pp. 534-543 ◽  
Author(s):  
Guo Shiou Foo ◽  
Carsten Sievers
Keyword(s):  
Activated Carbon ◽  
Synergistic Effect ◽  
Functional Groups ◽  
Defect Sites ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

scholarly journals Conditions of hydrolysis with a specific pair of endo- and exo-cellulases

2021 ◽  
Author(s):  
Yoshiki Kitano
Keyword(s):  
Synergistic Effect ◽  
Crystalline Cellulose ◽  
Carbohydrate Binding ◽  
Amorphous Cellulose ◽  
Potential Synergy ◽  
Hydrolysis Of Cellulose ◽  
Potential Alternative ◽  
Specific Pair ◽  
Hydrolysis Of ◽  
Increased Activity

Enzymatic hydrolysis of cellulose is a technology involved in the production of bioethanol, a potential alternative renewable energy. Many cellulases with endo- and exo- type of activity are known to hydrolyze cellulose synergistically. In this thesis, potential synergy between an endo-cellulase, Cel5B, with and without a carbohydrate- binding module (CBM6), and a new exo-cellulase, CBH1, from Trichoderma harzianum FP108 were examined during the hydrolysis of semi- crystalline cellulose (Avicel). Since CBM6 is recognized as having a high affinity for amorphous cellulose, it was hypothesized that this affinity could enhance the synergistic effect between the endo- and exo-cellulases by focusing the action to Cel5B+CBM6 on the amorphous regions of the Avicel substrate. The increased activity of Cel5B+CBM6 over Cel5B alone was confirmed. However, in contrast to our expectations, a synergistic effect was not observed between either endo- and exo-cellulase pairs. From the obtained hydrolysis yield, it was inferred that Cel5B+CBM6 may have exo-type activity that caused a competitive interaction with the exo-cellulase, which resulted in no synergy.

scholarly journals Enhancing the sugars production yieldby supporting H3PW12O40 heteropoly acid on activated carbon for use as catalyst in hydrolysis of cellulose

2018 ◽  
Vol 23 (4) ◽  
Author(s):  
Saulo do Amaral Carminati ◽  
Ana Carolina Cunha Arantes ◽  
Anna Cláudia Santos de Oliveira ◽  
Maria Lucia Bianchi
Keyword(s):  
Activated Carbon ◽  
Heteropoly Acid ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

scholarly journals Quantitative evaluation of ball-milling effects on the hydrolysis of cellulose catalysed by activated carbon

2014 ◽  
Vol 4 (8) ◽  
pp. 2312-2317 ◽  
Author(s):  
Mizuho Yabushita ◽  
Hirokazu Kobayashi ◽  
Kenji Hara ◽  
Atsushi Fukuoka
Keyword(s):  
Activated Carbon ◽  
Ball Milling ◽  
Quantitative Evaluation ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

Synergistic Effect of Nitric Acid Modified and Cu(II)-Loaded Activated Carbon on Catalytic Ozonation

2014 ◽  
Vol 1073-1076 ◽  
pp. 708-711
Author(s):  
Jing Zhang ◽  
Ya Wei Du ◽  
Xiao Jing Liu ◽  
Yu Wen Zhou ◽  
Chun Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Nitric Acid ◽  
Synergistic Effect ◽  
Functional Groups ◽  
Catalytic Ozonation ◽  
Reusable Catalyst ◽  
Surface Functional Groups ◽  
Acid Modification ◽  
Toc Removal

The surface properties and performance of activated carbon (AC) used for catalytic ozonation were investigated after nitric acid modification (N-AC) and Cu (II)-loaded (N-Cu-AC). The results showed that the nitric acid modification could increase the amount of surface functional groups of AC. As a result, the adsorption capacity and catalytic activity of AC could be improved. The surface functional groups and Cu (II)-loaded of N-Cu-AC showed a synergistic effect on catalytic ozonation, where the catalytic activity of Cu (II)-loaded was more stable. N-Cu-AC was an effective and reusable catalyst for catalytic ozonation. The highest TOC removal efficiency of 58.0% could be achieved when N-Cu-AC was used for 60 min-catalytic ozonation treatment of acid red 3R.

scholarly journals Conditions of hydrolysis with a specific pair of endo- and exo-cellulases

2021 ◽  
Author(s):  
Yoshiki Kitano
Keyword(s):  
Synergistic Effect ◽  
Crystalline Cellulose ◽  
Carbohydrate Binding ◽  
Amorphous Cellulose ◽  
Potential Synergy ◽  
Hydrolysis Of Cellulose ◽  
Potential Alternative ◽  
Specific Pair ◽  
Hydrolysis Of ◽  
Increased Activity

Enzymatic hydrolysis of cellulose is a technology involved in the production of bioethanol, a potential alternative renewable energy. Many cellulases with endo- and exo- type of activity are known to hydrolyze cellulose synergistically. In this thesis, potential synergy between an endo-cellulase, Cel5B, with and without a carbohydrate- binding module (CBM6), and a new exo-cellulase, CBH1, from Trichoderma harzianum FP108 were examined during the hydrolysis of semi- crystalline cellulose (Avicel). Since CBM6 is recognized as having a high affinity for amorphous cellulose, it was hypothesized that this affinity could enhance the synergistic effect between the endo- and exo-cellulases by focusing the action to Cel5B+CBM6 on the amorphous regions of the Avicel substrate. The increased activity of Cel5B+CBM6 over Cel5B alone was confirmed. However, in contrast to our expectations, a synergistic effect was not observed between either endo- and exo-cellulase pairs. From the obtained hydrolysis yield, it was inferred that Cel5B+CBM6 may have exo-type activity that caused a competitive interaction with the exo-cellulase, which resulted in no synergy.

scholarly journals Air Oxidation of Activated Carbon to Synthesize a Biomimetic Catalyst for Hydrolysis of Cellulose

ChemSusChem ◽  
2016 ◽  
Vol 9 (11) ◽  
pp. 1299-1303 ◽  
Author(s):  
Abhijit Shrotri ◽  
Hirokazu Kobayashi ◽  
Atsushi Fukuoka
Keyword(s):  
Activated Carbon ◽  
Air Oxidation ◽  
Biomimetic Catalyst ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of
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