Performance of Phosphorus Sorption on Thermosensitive Zirconium Alginate Hydrogel Beads with Full-interpenetrating Network†

doi:10.7503/cjcu20180064

Abstract

Abstract:

Thermosensitive poly(N-isopropylacrylamide)/zirconium alginate hydrogel beads with full-interpenetrating network(PNIPAM/Alg-Zr) were prepared and explored as a sorbent for phosphorus(P) recovery from aqueous solutions. The sorption of P onto PNIPAM/Alg-Zr was affected by pH, temperature and co-existing anions. A maximum uptake capacity of 30.42 mg/L was observed at pH=2. A low temperature was favourable for the sorption process. The presence of S$O_{4}^{2-}$ had a certain interference on P sorption while a slight effect of S$O_{4}^{2-}$ under higher ionic strength was observed. The sorption kinetics followed the pseudo-second-order model and was regulated by surface and intraparticle diffusion. The isotherm data were well fitted to the Freundlich model. The P-loaded PNIPAM/Alg-Zr achieved a faster desorption rate under a high temperature stimulus, and the uptake capacity of P remained stable after five times regeneration. The inferred sorption mechanisms were electrostatic interaction and ligand exchange verified by the analysis of pH value at zero point charge(pH_pzc) and XPS. PNIPAM/Alg-Zr exhibited good column-sorption characteristic, and the Thomas model could fit well the experimental data.

Key words: Zirconium alginate hydrogel bead, Full-interpenetrating network, Thermosensitive, Phosphorus, Column sorption

CLC Number:

O631
O647.3

TrendMD:

LUO Huayong,RONG Hongwei,ZENG Xueyang,WANG Randeng,CHU Zhaorui. Performance of Phosphorus Sorption on Thermosensitive Zirconium Alginate Hydrogel Beads with Full-interpenetrating Network^†[J]. Chem. J. Chinese Universities, 2018, 39(10): 2289.

Figures/Tables 12

Fig.1 SEM images of hydrogel beads(A) Outer surface; (B) cross-section.

Fig.2 ESR of hydrogel beads at different temperatures

Fig.3 FTIR spectra of the samples before(a) and after sorption(b)

Fig.4 Effests of pH(A), species of phosphate in different pH(B), temperature(C) and co-existing anions(D) on sorption performance

Fig.5 Fitting curves of pseudo-first-order and pseudo-second-order models(A) and intraparticle diffusion model(B)P concentration/(mg·L-1): a. 25; b. 50; c. 100.

Table 1 Kinetic model parameters of P sorption

Kinetic model	Parameter	Initial P concentration/(mg·L^-1)
Kinetic model	Parameter	25	50	100
Pseudo-first-order	k₁/min^-1	4.01×10^-3	6.76×10^-3	4.13×10^-3
	q_e/(mg·g^-1)	9.95	13.79	29.28
	R²	0.991	0.927	0.961
Pseudo-second-order	k₂/(g·mg^-1·min^-1)	4.95×10^-4	6.80×10^-4	1.75×10^-4
	q_e/(mg·g^-1)	11.21	14.98	32.92
	R²	0.992	0.982	0.992
Intraparticle diffusion	k_1d/(mg·g^-1·min^0.5)	0.48	0.42	1.19
	R²	0.986	0.989	0.922
	C₁	-1.00	3.66	0.46
	k_2d/(mg·g^-1·min^0.5)	0.23	0.19	0.36
	R²	0.997	0.980	0.965
	C₂	3.06	7.70	15.94

Fig.6 Sorption equilibrium isotherms fitting with Langmuir model(A) and Freundlich model(B)Temperature/K: a. 298; b. 308; c. 318.

Table 2 Isotherm model parameters of P sorption

T/K	Langmuir			Freundlich
T/K	q_max/(mg·g^-1)	k_L/(L·mg^-1)	R²	k_F/(mg·g^-1)(L·mg^-1 $) 1 / n$	n	R²
298	39.44	0.21	0.885	12.07	3.39	0.988
308	38.53	0.16	0.920	10.73	3.30	0.984
318	36.36	0.13	0.973	9.26	3.17	0.979

Table 2 Isotherm model parameters of P sorption

T/K	Langmuir			Freundlich
T/K	q_max/(mg·g^-1)	k_L/(L·mg^-1)	R²	k_F/(mg·g^-1)(L·mg^-1 $) 1 / n$	n	R²
298	39.44	0.21	0.885	12.07	3.39	0.988
308	38.53	0.16	0.920	10.73	3.30	0.984
318	36.36	0.13	0.973	9.26	3.17	0.979

Fig.7 Effect of different temperatures on desorption(A) and reusability of hydrogel beads(B)

Fig.8 XPS spectra of hydrogel bead before(a) and after sorption(b)(A), Zr3d before P sorption(B),Zr3d after P sorption(C) and P2p of hydrogel bead after P sorption(D)

Fig.9 Breakthrough curves of P sorption

Table 3 Parameters of breakthrough curves and Thomas model for P sorption

H/cm	Q/(mL·min^-1)	c₀/(mg·L^-1)	t_b/min	t_e/min	q_total/(mg·g^-1)	k_Th/(mL·mg^-1·min^-1)	q_o/(mg·g^-1)	R²
6.5	2	50	5.0	195.0	2.65	0.55	2.97	0.938
10.0	2	50	12.0	310.0	3.54	0.31	4.11	0.961
6.5	3	50	1.5	82.0	1.52	1.02	1.62	0.921

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