Adsorption Characteristics of Cu onto Typical Sewage Irrigated-Soils from Baoding, Hebei Province

doi:10.19657/j.geoscience.1000-8527.2022.010

Abstract

Abstract:

As one of the most toxic inorganic pollutants in soil, heavy metal Cu can readily accumulate in organic farmland soil. Its accumulation in soil would both cause harm to plants and threaten local economic development, human health and ecological stability. Sewage irrigation results in pollutant accumulation (including Cu) in soils. In this study, the dynamic/thermodynamic characteristics of Cu adsorption on two typical sewage irrigated-soils from Baoding, Hebei were investigated by batch adsorption experiment. The parameters obtained from the kinetic adsorption model and isothermal adsorption empirical model show that the Cu adsorption capacity on soil S1 surface is stronger than that on the deeper soil S2. The organic matter content of S1 is higher than that of S2, which provides more surface adsorption interface, which may account for the stronger Cu adsorption capacity of soil S1. Ionic strength has little effect on soil Cu adsorption rate. The effects of solution pH and DOM content on Cu adsorption are significant. Adsorbed Cu content is positively and negatively correlated to pH and DOM content, respectively. Our results also suggest that soils are strong pH buffer, and thus short periods of acid rain would not cause significant Cu transport. However, the application of organic fertilizer may form water-soluble Cu-DOM complex with Cu, which accelerates the Cu transport in soil and pollutes shallow groundwater.

Key words: batch experiment, heavy metal Cu, soil, organic matter, adsorption, saw age irrigation

CLC Number:

P641.3
X53

GUO Zhengcai, GUO Huaming, WEI Liang, GAO Zhipeng. Adsorption Characteristics of Cu onto Typical Sewage Irrigated-Soils from Baoding, Hebei Province[J]. Geoscience, 2022, 36(02): 524-532.

Figures/Tables 11

References 25

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样品	q_实验/ (μmol·g^-1)	准一级吸附动力学模型				假二级吸附动力学模型
样品	q_实验/ (μmol·g^-1)	R²	K₁/ h^-1	q_e/ (μmol·g^-1)		R²		K₂/ (g·μmol^-1·h^-1)		q_e/ (μmol·g^-1)		h/ (μmol·g^-1·h^-1)
S1	37.45	0.930 9	0.264 8	14.81	0.999 8		0.090 7		37.57		128.04
S2	35.25	0.947 7	0.208 0	38.50	0.992 1		0.014 2		36.17		18.53

样品	q_实验/ (μmol·g^-1)	准一级吸附动力学模型				假二级吸附动力学模型
样品	q_实验/ (μmol·g^-1)	R²	K₁/ h^-1	q_e/ (μmol·g^-1)		R²		K₂/ (g·μmol^-1·h^-1)		q_e/ (μmol·g^-1)		h/ (μmol·g^-1·h^-1)
S1	37.45	0.930 9	0.264 8	14.81	0.999 8		0.090 7		37.57		128.04
S2	35.25	0.947 7	0.208 0	38.50	0.992 1		0.014 2		36.17		18.53

样品	吸附全过程			快速吸附阶段			慢速吸附阶段
样品	R²	K₃/ (μmol·g^-1·h^-0.5)	b	R²	K₃/ (μmol·g^-1·h^-0.5)	b	R²	K₃/ (μmol·g^-1·h^-0.5)	b
S1	0.655 4	1.681 1	28.47	0.787 8	5.590 4	24.27	0.831 0	0.566 0	33.78
S2	0.901 1	4.202 1	10.63	0.976 6	8.360 0	5.95	0.838 1	2.622 9	18.34

样品	吸附全过程			快速吸附阶段			慢速吸附阶段
样品	R²	K₃/ (μmol·g^-1·h^-0.5)	b	R²	K₃/ (μmol·g^-1·h^-0.5)	b	R²	K₃/ (μmol·g^-1·h^-0.5)	b
S1	0.655 4	1.681 1	28.47	0.787 8	5.590 4	24.27	0.831 0	0.566 0	33.78
S2	0.901 1	4.202 1	10.63	0.976 6	8.360 0	5.95	0.838 1	2.622 9	18.34

土壤样品	Langmuir等温吸附参数			Freundlich等温吸附参数
土壤样品	k (μmol·g^-1)	b (L·mmol^-1)	R²	a	1/n	R²
S1	151.010	0.000 31	0.998 0	0.438	0.631	0.974 7
S2	133.627	0.000 33	0.999 5	0.435	0.620	0.979 8