Synthesis of Hierarchical Porous Nickel Phyllosilicate Microspheres as Efficient Adsorbents for Removal of Basic Fuchsin

doi:10.15541/jim20210063

Abstract

Abstract:

Nickel phyllosilicates have shown considerable potential in many fields such as electrochemistry and catalysis owing to their specific structures, attracting a great attention on preparation and properties of them in recent years. In this study, Ni₃Si₂O₅(OH)₄ microspheres were synthesized via a hydrothermal method by using NiCl₂ and tetraethyl orthosilicate (TEOS) as the raw materials. Effects of Ni/Si molar ratio and alkali source on the phase composition, morphology and textural property of the products were investigated. Under optimized conditions, the as-synthesized Ni₃Si₂O₅(OH)₄ microspheres presented a nanosheets-assembled morphology with an average diameter of ca. 2.5 μm, S_BET of 119.6 m²·g^-1, pore volume of 0.673 cm³·g^-1, and Zeta potential measurements showed that they were negatively charged with pH ranging from 3 to 10. When employed as the adsorbents for basic fuchsin (BF), the Ni₃Si₂O₅(OH)₄ microspheres showed an adsorption capacity of 120.7 mg·g^-1 with the removal efficiency up to 96.6% from 50 mg·L^-1 solution, superior to most of the referred adsorbents in literatures, and the adsorption kinetic data can be well interpretated via the pseudo-second-order model. Data of the relationship between equilibrium adsorption capacity and BF concentration were well fitted by Freundlich isotherm model with the 1/n value of 0.1678, indicating that the surface was heterogeneous and the adsorption strength was strong.

Key words: nickel phyllosilicate, hydrothermal synthesis, dye removal, adsorption, basic fuchsin

CLC Number:

TQ174

WANG Tingting, SHI Shumei, LIU Chenyuan, ZHU Wancheng, ZHANG Heng. Synthesis of Hierarchical Porous Nickel Phyllosilicate Microspheres as Efficient Adsorbents for Removal of Basic Fuchsin[J]. Journal of Inorganic Materials, 2021, 36(12): 1330-1336.

Figures/Tables 13

References 24

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Ni/Si molar ratio	S_BET /(m²·g^-1)	Pore volume /(cm³·g^-1)	Average pore diameter/nm
0.5 : 1	139.4	0.884	6.00
0.75 : 1	128.2	0.511	5.58
1 : 1	119.6	0.673	5.90
1.25 : 1	101.1	0.426	5.86
1.5 : 1	95.5	0.564	8.68

Ni/Si molar ratio	S_BET /(m²·g^-1)	Pore volume /(cm³·g^-1)	Average pore diameter/nm
0.5 : 1	139.4	0.884	6.00
0.75 : 1	128.2	0.511	5.58
1 : 1	119.6	0.673	5.90
1.25 : 1	101.1	0.426	5.86
1.5 : 1	95.5	0.564	8.68

q_e,exp/(mg·g^-1)	Pseudo-first-order kinetic model			Pseudo-second-order kinetic model
q_e,exp/(mg·g^-1)	q_e,calc1/(mg·g^-1)	k₁/min^-1	R²	q_e,calc2/(mg·g^-1)	k₂/(mg·g^-1·min^-1)	R²
120.7	55.2	0.0483	0.8526	118.5	0.0051	0.9979

q_e,exp/(mg·g^-1)	Pseudo-first-order kinetic model			Pseudo-second-order kinetic model
q_e,exp/(mg·g^-1)	q_e,calc1/(mg·g^-1)	k₁/min^-1	R²	q_e,calc2/(mg·g^-1)	k₂/(mg·g^-1·min^-1)	R²
120.7	55.2	0.0483	0.8526	118.5	0.0051	0.9979

Adsorbents	Initial concentration of BF solution/(mg·L^-1)	Adsorption equilibrium time/min	Maximum adsorption capacity /(mg·g^-1)	Ref.
Alkali-activated diatomite	15	30	4.85	[1]
(Acrylamide-co-sodium methacrylate )-graft-chitosan gel	125	180	6.1	[2]
β-cyclodextrin-carboxymethyl cellulose-graphene oxide composite	100	150	6.5	[3]
Hydroxy-aluminum pillared bentonite	100	10-15	6.6	[4]
Iron-manganese oxide coated kaolinite	40	50	8.16	[5]
Copper vinylphosphonate	30	150	19.29	[6]
Fe-ZSM-5	20	240	25.8	[7]
β-cyclodextrin-styrene-based polymer	50	180	29.6	[8]
CoFe₂O₄-HA-ECH	33.8	30	31.3	[9]
Magnetic chitosan/graphene oxide	50	70	32.8	[10]
Activated carbon/ferrospinel composite	100	60	49.9	[11]
Al-MCM-41	60	240	54	[12]
Ba(B₂Si₂O₈) microspheres	30	240	58.0	[13]
NiFe₂O₄/polythiophene nanocomposite	50	30	76	[14]
Ni₃Si₂O₅(OH)₄	50	180	120.7	This work