Synthesis and adsorption properties of modified SDB carrier
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Styrene–divinylbenzene copolymer (SDB) is a key material for preparing Pt/SDB hydrophobic catalyst, which could be used for the treatment and purification of tritiated water. In this paper, a modified SDB (MSDB) carrier based on tert-butyl styrene (t-Bu-St), methyl methacrylate (MMA), styrene (St) and divinylbenzene (DVB) was prepared by aqueous suspension polymerization. Static adsorption experiment shows that the MSDB has the best adsorption performance at the molar ratio of St, DVB, t-Bu-St and MMA of 1:0.85:0.3:0.3 with n-heptane as porogen. The adsorption behavior of MSDB is analyzed by theoretical formulas. Data show that the adsorption process is in accordance with the Lagrange pseudo-first-order kinetics and Freundlich isotherm (1/n < 1), which is exothermic and entropy decrease (ΔH0 < 0, ΔS0 < 0) in a temperature range of 293.15–333.15 K.
KeywordsHydrophobic catalyst Modification Adsorption Kinetics Isotherm
We greatly acknowledge the financial support of the Southwest University of Science and Technology Doctoral Startup Foundation (Grant Number 16ZX7139).
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