Phosphorus Sorption Characteristics on Aluminum Oxides with Different Structures

Jing LI; Xiaoyue LIU; Qianfeng QIU; Ling LI; Xiaoyan CAO

doi:10.15541/jim20190444

Journals >Journal of Inorganic Materials >Volume 35 >Issue 9 >Page 1005 > Article

Journal of Inorganic Materials
Vol. 35, Issue 9, 1005 (2020)

Phosphorus Sorption Characteristics on Aluminum Oxides with Different Structures

Jing LI^1,2, Xiaoyue LIU², Qianfeng QIU², Ling LI², and Xiaoyan CAO^1,2,3,*

Author Affiliations

¹Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education /Institute for Advanced Ocean Study, Ocean University of China, Qingdao 266100, China

²College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

³Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China

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DOI: 10.15541/jim20190444 Cite this Article

Jing LI, Xiaoyue LIU, Qianfeng QIU, Ling LI, Xiaoyan CAO. Phosphorus Sorption Characteristics on Aluminum Oxides with Different Structures[J]. Journal of Inorganic Materials, 2020, 35(9): 1005 Copy Citation Text

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XRD patterns of γ-Al2O3 and amorphous alumina

1. XRD patterns of γ-Al₂O₃and amorphous alumina

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Fourier infrared spectra of γ-Al2O3 (a) and amorphous alumina (b)

2. Fourier infrared spectra of γ-Al₂O₃(a) and amorphous alumina (b)

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3. SEM images of γ-Al₂O₃ (a) and amorphous alumina (b)

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4. Sorption kinetics curves of phosphate on amorphous alumina

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5. Sorption isotherms of phosphate on γ-Al₂O₃(a) and amorphous alumina (b) in NaNO₃ with different concentrations

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6. Sorption isotherms of phosphate on γ-Al₂O₃(a) and amorphous alumina (b) at different femperatures

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7. Sorption pH edges curves of P on γ-Al₂O₃ and amorphous alumina

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NaNO₃ concentration/(mol·L^-1)	H_S concentration/(mol·L^-1)		TOTH_pH=8/(mmol·L^-1)		pH_PZNPC^*
NaNO₃ concentration/(mol·L^-1)	γ-Al₂O₃	Amorphous alumina	γ-Al₂O₃	Amorphous alumina	γ-Al₂O₃	Amorphous alumina
0.01	3.35×10^-3	2.69×10^-3	-	-	4.52	4.25
0.10	2.94×10^-3	1.79×10^-3	-	-
0.70	2.75×10^-3	1.09×10^-3	-0.809	-1.380

Table 1. Surface acid-base properties of two aluminum oxides in different ionic strength media

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Medium	F_rap	F_slow	k_slow/h^-1	k_rap/h^-1	Q_e/(mg·g^-1)	r²
0.7 mol·L^-1 NaNO₃	0.813	0.187	0.977	26.32	21.42	0.977
NSW	0.740	0.260	0.193	20.23	16.56	0.988

Table 2. Sorption kinetic parameters of phosphorus on amorphous alumina

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Sorbent	I/(mol·L^-1)	Freundlich			Langmuir
Sorbent	I/(mol·L^-1)	K_F/(mg·g^-1) (L·mg^-1)^1/ⁿ	n	r²	Q_m/(mg·g^-1)	K_L/(L·mg^-1)	r²
γ-Al₂O₃	0.7	12.39	4.52	0.942	14.93	5.288	0.848
	0.1	13.20	6.08	0.912	13.47	18.29	0.702
	0.01	14.37	7.20	0.896	14.28	27.90	0.485
Amorphous alumina	0.7	26.28	3.27	0.933	34.70	3.828	0.838
	0.1	27.66	4.09	0.933	34.60	4.888	0.820
	0.01	28.36	3.24	0.907	43.22	2.046	0.817

Table 3. Isothermal sorption parameters of phosphates on γ-Al₂O₃and amorphous alumina

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Adsorbent	T/K	K_F/(mg·g^-1) (L·mg^-1)^1/ⁿ	n	r²	ΔG^θ/(kJ·mol^-1)	ΔH^θ/(kJ·mol^-1)	ΔS^θ/(J·mol^-1·K^-1)
γ-Al₂O₃	298	11.55	5.18	0.938	-23.18	9.007	108.0
	303	12.22	4.40	0.948	-23.71
	308	12.99	4.98	0.952	-24.26
Amorphous alumina	298	26.28	3.27	0.933	-25.21	11.96	124.8
	303	28.84	3.60	0.947	-25.87
	308	30.73	3.64	0.951	-26.46

Table 4. Sorption thermodynamic parameters of phosphate on γ-Al₂O₃ and amorphous alumina

Jing LI, Xiaoyue LIU, Qianfeng QIU, Ling LI, Xiaoyan CAO. Phosphorus Sorption Characteristics on Aluminum Oxides with Different Structures[J]. Journal of Inorganic Materials, 2020, 35(9): 1005

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