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Author:

Sun He (Sun He.) | Li Qunyan (Li Qunyan.) | Wang Xuewei (Wang Xuewei.) | Wei Qi (Wei Qi.) | Nie Zuoren (Nie Zuoren.) (Scholars:聂祚仁)

Indexed by:

Scopus SCIE PKU CSCD

Abstract:

Mesoporous carbons have been rapidly synthesized by an aqueous way using polymerization of phloroglucinol and formaldehyde in the presence of triblock copolymer F127 (PEO106PPO70PEO106) under different conditions of hydrochloric acid. The micromorphology, pore structure of the obtained materials were characterized in detail by TEM, SEM and N-2 adsorption-desorption. The obtained mesoporous carbons were utilized to adsorb the horseradish peroxidase (HRP) and the thermal stability, pH stability and storage stability of the immobilized HRP activity were also investigated. The results reveal the as-synthesized mesoporous carbon has a wormhole-like mesopore structure. The concentration of hydrochloric acid is a key factor influencing the polymerization rate of phenolic resins. With the concentrations of hydrochloric acid increasing from 0.5 mol/L to 2.5 mol/L, the pore size of mesoporous carbons decreased from 7.6 nm to 5.6 nm, the BET surface areas decreased from 787.8 m(2)/g to 691.1 m(2)/g, and pore volumes decreased from 0.64 cm(3)/g to 0.49 cm(3)/g. During the process of polymerization, the phase separation appeared in 20 min, while in the reported work, the polymerization of resorcinol and phenol with formaldehyde took much longer time. After incubation at 70 degrees C for 30 min, the activity of immobilized HRP decreased slowly than that of the free HRP. The free and immobilized HRP remained 12.33% and 56.22% of their initial activity, respectively. Compare to free MU, the immobilized HRP exhibited higher retention activity with a wider pH range between 4.0 and 10.0. The activity of immobilized HRP was also tested for both operation and storage stability. The enzyme activity of immobilized HRP decreased with increasing amount of recycle times. After recycled for 10 d, the activity of immobilized HRP retains 29% of its initial activity. The activity of immobilized enzyme could retain as high as 62% of its initial activity after 50 d of storage at 4 degrees C, while the free HRP only retains 31%. The results have shown that the thermal stability, pH stability and storage stability of immobilized enzyme were significantly improved in comparison with free HRP.

Keyword:

mesoporous carbon rapid aqueous synthesis immobilization horseradish peroxidase

Author Community:

  • [ 1 ] [Sun He]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Li Qunyan]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Wang Xuewei]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Wei Qi]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Nie Zuoren]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

Reprint Author's Address:

  • [Sun He]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

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Source :

ACTA CHIMICA SINICA

ISSN: 0567-7351

Year: 2013

Issue: 4

Volume: 71

Page: 619-624

2 . 5 0 0

JCR@2022

ESI Discipline: CHEMISTRY;

JCR Journal Grade:3

CAS Journal Grade:4

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 1

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 3

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