Composites with Macroporous Poly(vinyl alcohol) Cryogels with Attached Activated Carbon Microparticles with Controlled Accessibility of a Surface

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• 作者：Yishan Zheng ; Vladimir M. Gun鈥檏o ; Carol A. Howell ; Susan R. Sandeman ; Gary J. Phillips ; Oleksandr P. Kozynchenko ; Stephen R. Tennison ; Alexander E. Ivanov ; Sergey V. Mikhalovsky
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：November 28, 2012
• 年：2012
• 卷：4
• 期：11
• 页码：5936-5944
• 全文大小：551K
• 年卷期：v.4,no.11(November 28, 2012)
• ISSN：1944-8252

文摘

A set of glutaraldehyde (GA) cross-linked poly(vinyl alcohol)/activated carbon (PVA/GA/AC) composites prepared in the form of monolithic rods using a cryogelation technique and studied using adsorption, mercury porosimetry, scanning electron microscopy (SEM), and quantum chemistry methods display porosity similar to that of PVA/GA cryogel at a high GA content (content ratio GA/AC = 1 and GA/PVA = 0.2). GA cross-linked PVA multilayer coverage is an effective barrier for adsorption on AC particles. Variations in surface chemistry (AC initial and oxidized in air at 300 掳C for 12 h) and content (14鈥?2.5%w/w) of ACs in PVA/GA/AC composites relatively weakly affect their textural characteristics at a high GA content (specific surface area S_BET < 120 m²/g, pore volume V_p < 0.35 cm³/g). However, PVA/GA/AC composite rods formed with a lower concentration of GA (content ratio GA/AC = 1/6 and GA/PVA = 1/10) have significantly greater S_BET (500 m²/g) and V_p (>0.55 cm³/g) values because of improved accessibility of the AC surface. This provides better adsorption of methylene blue as a probe compound.

Keywords:

activated carbon; glutaraldehyde cross-linked poly(vinyl alcohol); PVA/AC composites; textural characteristics; adsorption