磷石膏对黄壤磷吸附性能及吸附动力学分析

doi:10.3969/j.issn.1001-1803.2022.06.005

Abstract

Abstract:

The effects of PG on the phosphorus adsorption capacity of loess soil and the influence mechanism therein were investigated to provide some scientific basis for the resource utilization of phosphogypsum （PG） in agriculture. The effects of different PG dosages on the phosphorus adsorption properties and the adsorption kinetics were analyzed in loess soil with different incubation time. The results showed that the dosage of PG had a significant effect on the adsorption of phosphorus in loess soil （P<0.05）. The phosphorus adsorption capacity was increased first, and then decreased with the increase of PG addition and reached the highest value at 0.5 g PG/100 g soil. Compared with the original soil, the phosphorus adsorption capacity and the content of amorphous iron oxide （Feo） were increased by 2.80% and 2.33%, respectively, and the pH was increased from 3.77 to 4.00. Moreover, the phosphorus adsorption kinetic process of the mixed soil samples fitted the pseudo-first-order kinetic models with PG content of 0.5 g/100 g soil and 1.0 g/100 g soil, and then fitted the pseudo-second-order kinetic models with the increase of PG content. However, the effect of PG on the phosphorus adsorption capacity of loess soil was most significant in the first 7 days. Na₂SO₄, NaH₂PO₄ and CaSO₄released from PG promoted the phosphorus adsorption capacity, while NaF inhibited the phosphorus adsorption capacity of loess soil. The present study shows that the phosphorus adsorption capacity of loess soil can be adjusted by PG dosage.

Key words: phosphogypsum, loess soil, phosphorus adsorption, adsorption kinetics

CLC Number:

TQ424

Xuan Chao,Hu Changrong,Yi Yun,Liu Fei,Cao Jianxin,Pan Hongyan. Analysis of phosphorus adsorption performance and adsorption kinetics of phosphogypsum in loess soil[J].China Surfactant Detergent & Cosmetics, 2022, 52(6): 606-612.

Figures/Tables 9

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References 25

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土壤类型	pH	含量/（g/kg 土）
土壤类型	pH	总磷	有效磷	有机质	游离氧化铁	无定型氧化铁（Feo）
黄壤	3.77	0.93	0.082	25.34	56.46	3.64

样品	pH	w/%
样品	pH	CaSO₄	总P₂O₅	水溶P₂O₅	Al₂O₃	Fe₂O₃	水溶F	其他
PG	3.41	91.10	1.69	0.94	0.36	0.16	0.10	6.53

PG掺量/（g/100 g土）	0	0.5	1	5	10
pH	3.77±0.005 6^a	3.83±0.005 6^b	3.85±0.005 6^b	3.89±0.023 1^c	4.00±0.025 2^d
Feo含量/（mg/g）	3.06±0.017 1^b	3.13±0.002 2^c	3.19±0.013 0^d	3.08±0.006 9^b	2.97±0.016 7^a
磷吸附量/（mg/g）	1.07±0.000 6^b	1.10±0.014 4^a	1.05±0.010 7^c	0.85±0.002 5^d	0.72±0.015 3^e

土壤	准一级方程 ln（q_e-q_t）=ln q_e-k₁t			准二级方程 $\frac{1}{{{q}_{t}}}=\frac{1}{(t{{k}_{2}}q_{e}^{2})}+\frac{1}{{{q}_{e}}}$			双常数方程 ln q_t = aln t+b			Elovich方程 q_t = aln t+b
土壤	q_e	k₁	R²	q_e	k₂	R²	a	b	R²	a	b	R²
CK	409.64	0.020 0	0.976 0	515.39	3.98×10^-5	0.986 6	0.470 5	3.645 4	0.990 0	-133.69	102.83	0.975 2
PG0.5	484.64	0.033 7	0.998 9	583.01	6.40×10^-5	0.990 0	0.485 5	3.900 4	0.894 2	-125.55	125.94	0.969 5
PG1	471.47	0.028 1	0.994 5	571.25	5.40×10^-5	0.993 6	0.482 7	3.822 1	0.924 9	-136.54	121.62	0.981 7
PG5	408.11	0.036 1	0.991 3	490.77	8.19×10^-5	0.996 4	0.453 8	3.887 2	0.895 0	-90.73	104.06	0.986 0
PG10	368.63	0.025 4	0.966 7	473.07	5.23×10^-5	0.985 2	0.459 4	3.678 5	0.976 0	-113.23	96.27	0.986 4

Analysis of phosphorus adsorption performance and adsorption kinetics of phosphogypsum in loess soil

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