Adsorption of Cadmium on Fe-Mn Nodules Derived From Soil by Spectral Methods

样品		主量元素氧化物/(mg·g^-1)
样品		SiO₂	Al₂O₃	Fe₂O₃	MnO	K₂O	Na₂O	MgO	CaO
铁锰结核	小于0.25 mm	253.2	163.7	309.6	30.2	5.68	1.89	1.41	2.03
	0.25~0.5 mm	267.4	162.4	323.8	26.4	5.02	2.25	1.37	2.21
	0.5~1 mm	269.6	168.4	315.4	28.3	5.86	2.14	1.55	1.87
	1~2 mm	288.5	165.5	320.9	25.5	5.15	2.23	1.62	2.08
	大于2 mm	289.1	162.2	301.7	29.6	5.17	2.09	1.29	1.94
	本文使用	271.3	165.9	312.9	26.6	5.33	2.11	1.45	1.99
土壤基质		583.2	183.5	56.8	1.07	7.41	3.32	1.65	1.21

Table 2. Thermodynamic parameters of Cd adsorption on Fe-Mn nodules sample
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Table 2. Thermodynamic parameters of Cd adsorption on Fe-Mn nodules sample
T/
K ΔH⁰/
(kJ·mol^-1) ΔG⁰/
(kJ·mol^-1) ΔS⁰/
[J·(mol·K)^-1]
278 -4.34
283 -4.75
288 -5.16
293 8.14 -5.57 160.23
298 -5.98
303 -6.39
308 -6.80

Table 3. Desorption effect of Fe-Mn nodules sample with different aqueous solutions
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Table 3. Desorption effect of Fe-Mn nodules sample with different aqueous solutions
溶液体积/mL 洗脱率/%
纯净水自来水酸液
50 33.66 38.45 47.33
100 35.95 40.21 53.66
150 38.25 42.26 55.25
200 39.32 43.05 56.91
250 40.35 43.58 57.45
500 40.67 43.78 57.98
750 41.11 43.91 58.41
1 000 41.35 44.02 58.68

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Chun-hui FAN, Jin-huan ZHENG, Yu-fei WANG, Zhe SU, Long-jian LIN, Chen YANG. Adsorption of Cadmium on Fe-Mn Nodules Derived From Soil by Spectral Methods[J]. Spectroscopy and Spectral Analysis, 2022, 42(2): 616

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