Magneto-Sensitive Adsorbents Modified by Functional Nitrogen-Containing Groups

Table 1 Composition of initial reactants and properties of magneto-sensitive adsorbents

Sample	Functional groups	Molar ratio of components Fe₃O₄/TEOS/N-silane/R-silane	C _f.gr., mmol/g	S _sp., m²/g
A	≡Si(CH₂)₃NH₂	1/15.5/2.7	2.2	122
AM	≡Si(CH₂)₃NH₂/≡SiCH₃	1/15.5/1.3/1.3	1.6	29
AP	≡Si(CH₂)₃NH₂/≡Si(CH₂)₂CH₃	1/15.5/1.3/1.3	1.6	43
DA	≡Si(CH₂)₃NH(CH₂)₂NH₂	1/15.5/2.7	2.7	160
BA	[≡Si(CH₂)₃]₂NH	1/15.5/2.7	1.9	33

C _f.gr.—concentration of amino groups present in adsorbent structure; S _sp.—specific surface area; N-silane—functional monomer having amino groups; R-silane—functional monomer having aliphatic chains