Ferric trichloride (FeCl36H2O), ferrous chloride (FeCl24H2O), tetraethyl orthosilicate (TEOS), Silane, ethenyltrimethoxy (A-171) were purchased from Sinopharm Chemical Reagent Co., Ltd.; Poly (4-styrenesulfonic acid-co-maleic acid) sodium salt (PSSMA) was obtained from Sahn Chemical Technology Co., Ltd.
The characteristic absorption bands at 1541 cm-1 and 1620 cm-1 indicate that there may be exist the symmetric and asymmetric carboxylate group, derived from iron dispersant Poly (4-styrenesulfonic acid-co-maleic acid) sodium salt (PSSMA) [10], indicating that PSSMA participated in synthesis of the product.