Removal of Ca(II) from aqueous solutions by cellulose modified with calix[4]arene

Zhou, Yanmei; Hu, Xiaoyi; Zhang, Min; Zhuo, Xiaofeng

doi:10.1080/19443994.2013.803696

Cited by 3 publications

(1 citation statement)

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“…The surface epoxy group density of the silane‐modified PVDF membrane was measured with an acetone hydrochloride titration method . The PVDF‐KH560 membrane (3.14 ± 0.03 cm 2 ) was immersed into 20 mL of hydrochloric acid/acetone solution (1:4,000, v/v) in a conical flask, and then three drops of phenolphthalein indicator (0.12 wt%) were added to the solution under magnetic stirring.…”

Section: Methodsmentioning

confidence: 99%

Immobilization of carbonic anhydrase on polyvinylidene fluoride membranes

Sun

Wei

Wang

et al. 2018

Biotech and App Biochem

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In recent years, the application of carbonic anhydrase (CA) in CO removal has attracted great interest. However, obtaining high enzyme recovery activity is difficult in existing immobilization techniques. In this work, water plasma-treated poly(vinylidene fluoride) (PVDF) membranes were modified via 3-aminopropyl triethoxy silane (KH550) or γ-(2, 3-epoxypropoxy) propyl trimethoxy silane (KH560), and then CA was attached. The immobilization process was optimized, and the catalytic properties of PVDF-attached CA were characterized. The maximum activity recovery of PVDF-KH550-CA was 60%, whereas that of PVDF-KH560-CA was 33%. The K values of PVDF-KH550-CA, PVDF-KH560-CA, and free enzyme were 9.97 ± 0.37, 12.5 ± 0.2, and 6.18 ± 0.23 mM, respectively, and their K /K values were 206 ± 2, 117 ± 5, and 488 ± 4 M ·Sec . PVDF-attached CA shows excellent storage stability and reusability, and their half-life values were 82 and 78 days at 4 °C. At 25 °C, they were 50 and 37 days, respectively. PVDF-KH550-CA and PVDF-KH560-CA retained approximately 85% and 72% of the initial activity after undergoing 10 cycles. In the presence of them, the generation rates of CaCO were 76% and 65% of the free CA system, which were 1.6 and 1.3 times that of the blank system, respectively. Its role in accelerating CO sequestration holds great promise for its practical application.

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Section: Methodsmentioning

confidence: 99%