Comparison on the Surface Structure Properties along with Fe(II) and Mn(II) Removal Characteristics of Rice Husk Ash, Inactive Saccharomyces cerevisiae Powder, and Rice Husk

Table 1

The key chemical groups or bonds detected on the three researched potential adsorbents, such as rice husk ash, RHA; inactive Saccharomyces cerevisiae powder, ISP; rice husk, RH.

Wavelength	Chemical groups or bonds	Potential adsorbents
		RHA	ISP	RH
3500–3200 cm^−1	Hydroxyl group	+	+	+
795 cm^−1	C-H bond	+	−	−
2928–2925 cm^−1	Methyl group	−	+	+
2119 cm^−1	Methylene group	−	+	−
1453 cm^−1	C-N bond	−	+	−
1657–1638 cm^−1	Carbonyl group	−	+	+
1533 cm^−1	N-H bond	−	+	−
1512–1455 cm^−1	Ester group	−	−	+

Note: “+” represents the corresponding chemical group detected and “−” represents the chemical group not detected.