A New Porous Zirconium Phosphonate Hybride Material and Its Adsorption Properties

doi:10.15541/jim20160183

Abstract

Abstract:

Synthesis of organic-inorganic hybrid hierarchical porous materials with strong ligand in framework is an important field of current research in adsorption. A new kind of inorganic/organic hierarchical zirconium phosphonate material (ZrPTA) with porous structure was prepared from bis(hexamethylene)triamino-N, N-bisacetyl- phosphonic acid and ZrOCl₂·8H₂O in water solution by using hydrothermal synthesis technology. The samples were characterized by FT-IR spectroscope, TGA, XRD, XPS, SEM and element analysis. The results show that the material possesses a rod-like morphology, and the rods contain micropores of 1.38 nm and 1.93 nm in diameter, mesopores of 2.99 nm in diameter, and a surface area of ~112.2 m²/g. The as-prepared ZrPTA is more efficient in removing Pb²⁺, Cu²⁺ and Cd²⁺ from wastewater. Its maximum adsorption capacities for Pb²⁺, Cu²⁺ and Cd²⁺ are 742.7, 689.8 and 627.0 mg/g, respectively, which is much higher than the maximum adsorption capacities of the adsorbents reported. The perfect properties make the material good prospects in application as an adsorbent in wastewater processing.

Key words: zirconium phosphonate, porous materials, hydrothermal synthesis, interfaces, adsorption

CLC Number:

TQ174

ABUBAKER Abutartour, LOTFIA El-Majdoub, SHI Ya-Sai, LI Ni-Li, XU Qing-Hong. A New Porous Zirconium Phosphonate Hybride Material and Its Adsorption Properties[J]. Journal of Inorganic Materials, 2017, 32(3): 305-312.

Figures/Tables 13

Fig. 1 Structures of bis(hexamethylene)triamino-N-N-bisac- etylphosphorus oxychloride

Fig. 2 (A) FT-IR spectra of bis(hexamethylene)triamine (a), bis(hexamethylene)triamino-N-N-bisacetyl-phosphorus oxychloride (b) and ZrPTA (c); (B) FT-IR spectra of ZrPTA immersed in HCl solutions with different pH (a: pH=5.0; b: pH=6.0; c: unimmersed)

Fig. 3 PXRD patterns of ZrPTA (A) and ZrPTA delt in HCl solutions with different pH (B)

Fig. 4 N2 adsorption-desorption isotherms curve (a) and pore width distribution (b) of ZrPTA

Fig. 5 Possible porous structure in ZrPTA

Fig. 6 TEM (a) and SEM (b) images of ZrPTA

Fig. 7 TG-DTA curves of ZrPTA

Fig. 8 Change of adsorptions of ZrPTA to metal ions with different concentrations with time ^(adsorbent dosage=1.0 g/L, temperature is (25±2)℃, pH=4.0)^(a) 900 mg/L; (b) 800 mg/L; (c) 700 mg/L; (d) 600 mg/L; (e) 500 mg/L

Table 1 Adsorption date (mg/g) and adsorption percents (%) (in the bracket) of the adsorbent to three metal ions at different origin concentrations

	500/(mg·L^-1)	600/(mg·L^-1)	700/(mg·L^-1)	800/(mg·L^-1)	900/(mg·L^-1)
Pb²⁺	459.21 (91.84)	541.25 (90.20)	586.33 (83.76)	670.15 (83.76)	742.96 (82.55)
Cd²⁺	422.98 (84.59)	516.33 (86.05)	611.97 (87.42)	676.21 (84.52)	627.04 (69.67)
Cu²⁺	452.15 (90.43)	534.87 (89.14)	619.43 (88.48)	671.04 (83.88)	689.81 (76.64)

Table 2 Comparison of qe of ZrPTA for Pb2+, Cu2+ and Cd2+ with those of different types of adsorbents in references

Adsorbents	Magnetic chelating resin	Zwitterionic hybrid polymers	ZrPTA	Polycarboxy-lated starch	Ion-imprinted fiber	ZrPTA	Porous bioadsorbent	Activated carbon	ZrPTA
		to Pb²⁺			to Cu²⁺			to Cd²⁺
q_e /(mg·g^-1)	571.8	380.2	742.7	128.3	120.0	689.8	278.6	157.4	627.0
Temperature	45℃	45℃	25℃	40℃	30℃	25℃	25℃	25℃	25℃
pH	6.0	5.0	4.0	7.0	6.0	4.0	5.0	5.0	4.0
Ref	[20]			[21]			[22]

Fig. 9 XPS spectra of N1s in ZrPTA (a), ZrPTA/Pb2+ (b), ZrPTA/Cd2+ (c) and ZrPTA/Cu2+ (d)

Fig. 10 Relations between the equilibrium adsorption amounts at a given concentration (c0 = 900mg/L) and temperature (from 30℃ to 80℃) of ZrPTA to Pb2+, Cu2+ and Cd2+

Fig. 11 Equilibrium adsorption amounts of ZrPTA to Pb2+, Cu2+ and Cd2+ in different pH solution at room temperature

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