Selective Synthesis of Manganese/Silicon Complexes in Supercritical Water

Table 1

Surface atomic concentration (%) of samples characterized by XPS.

Sample	Mn 2p	O 1s	Si 2p	N 1s	C 1s
A1	6.11	69.62	23.21	1.06	—
B1	0.70	69.66	29.35	0.35	—
B3	0.39	65.82	27.46	0.26	6.07
B4	7.38	51.30	15.57	—	25.75
C4	2.99	36.46	4.99	—	55.56

Note: A1, B1, B3, B4, and C4 are the samples from reaction of Mn(NO₃)₂ with silica sand, Mn(NO₃)₂ with silica sol, MnSO₄ with silica sol, Mn(Ac)₂ with silica sol, and Mn(Ac)₂ with tetraethyl orthosilicate, respectively.