Study of the Adsorption of Arsenic (III and V) by Magnetite Nanoparticles Synthetized via AACVD

Monárrez-Cordero, Blanca Elizabeth; Amézaga-Madrid, Patricia; Leyva-Porras, César Cutberto; Pizá-Ruiz, Pedro; Miki-Yoshida, Mario

doi:10.1590/1980-5373-MR-2015-0667

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Articles • Mat. Res. 19 (Suppl 1) • Dec 2016 • https://doi.org/10.1590/1980-5373-MR-2015-0667 copy

Study of the Adsorption of Arsenic (III and V) by Magnetite Nanoparticles Synthetized via AACVD

Authorship SCIMAGO INSTITUTIONS RANKINGS

Globally, water pollution is mainly caused by the presence of heavy metals and metalloids such as arsenic. The majority of the techniques employed in the removal are of low efficiency and high cost. Therefore, in this work it is presented the adsorption processes of arsenic (As III and V) ions employing magnetite nanoparticles (MNPs) synthesized by the aerosol assisted chemical vapor deposition (AACVD) process. The adsorption efficiency was determined at different times and concentrations. The remaining As concentration in the solutions was analyzed by atomic absorption spectroscopy. The adsorbed As ions on the surface of the NMPs was analyzed by high resolution transmission electron microscopy. The results showed an overall removal efficiency of 87% for As⁺³ and 98% for As⁺⁵, in a contact time of 15 minutes. Results suggested the use of NMPs as a promising alternative in the removal of As ions in water.

Keywords:
AACVD; MNPs; adsorption isotherms; physisorption process

Isotherm	General Equation	Linearized equation	Parameters	Description
Langmuir	$q_{e} = \frac{Q_{0} K_{L} C_{e}}{C_{e} K_{L} + 1}$	$\frac{C_{e}}{q_{e}} = \frac{C_{e}}{Q_{0}} + \frac{1}{K_{L} Q_{0}}$	Q₀	Maximum adsorption capacity
			K_L	Constant Langmuir (Adsorption energy)
			C_e	Equilibrium concentration of the As
			q_e	Equilibrium adsorption capacity of adsorbent
Freundlich	$q_{e} = Q_{0} C_{e}^{\frac{1}{K_{F}}}$	$\ln (q_{e}) = \ln (Q_{0}) + \frac{1}{K_{F}} \ln (C_{e})$	Q₀	Maximum adsorption capacity
			K_F	Constant Freundlich (Adsorption energy)
			C_e	Equilibrium concentration of the solution
Dubinin			Q₀	Maximum adsorption capacity
			K_D	Free energy of the adsorption per molecule
	$q_{e} = Q_{0} e^{k ε^{2}}$	$\ln (q_{e}) = \ln (Q_{0}) - K_{D} ε^{2}$	q_e	Equilibrium adsorption capacity of adsorbent
		$ε = RT \ln (1 + \frac{1}{C_{e}})$	R	Universal gas constant
			Ɛ	Polanyi potential
			T	Ambient Temperature

Time (min)	As⁺⁵ removal (%) [0.036 mg L^-1]	As⁺⁵ removal (%) [0.066 mg L^-1]	As⁺³ removal (%) [0.152 mg L^-1]	As⁺³ removal (%) [0.164 mg L^-1]
1	64	70	49	54
5	89	91	62	68
10	94	95	73	78
15	96	98	85	87
30	100	100	88	90

	C₀ (mg L^-1)	V (L) Solution	MNPs (mg)	q_e (mg g^-1)
As⁺⁵	0.036	0.1	0.01	0.355
As⁺⁵	0.066	0.1	0.01	0.63
As⁺³	0.152	0.1	0.01	1.33
As⁺³	0.164	0.1	0.01	1.38

Adsorbent	Initial concentration of adsorbate	Adsorption capacity (mg g^-1)	Amount ofAdsorbent utilized
Nickel/nickel boride nanoparticles coated resin ⁴4 Çiftçi TD, Henden E. Nickel/nickel boride nanoparticles coated resin: A novel adsorbent for arsenic(III) and arsenic(V) removal. Powder Technology. 2015;269:470-480.	100 ppm	23.4 As⁺³	0.1 g
	100 ppm	17.8 As⁺⁵	0.4 g
Fe₇S₈ nanoparticles⁵5 Cantu J, Gonzalez LE, Goodship J, Contreras M, Joseph M, Garza C, et al. Removal of arsenic from water using synthetic Fe7S8 nanoparticles. Chemical Engineering Journal. 2016;290:428-437.	300 ppb	14.3 As⁺³	0.01g
	300 ppb	31.3 As⁺⁵	0.01g
Iron oxide Green nanoparticles⁴⁴44 Saritha A, Raju B, Narayana RD, Roychowdhury A, Das D, Hussain KA. Facile green synthesis of iron oxide nanoparticles via solid-state thermolysis of a chiral, 3D anhydrous potassium tris(oxalato)ferrate(III) precursor. Advanced Powder Technology. 2015;26(2):349-354.	600 ppm	3.77 As⁺⁵	2.5 g
MOF-808 nanoparticles⁴⁵45 Li ZQ, Yang JC, Sui KW, Yin N. Facile synthesis of metal-organic framework MOF-808 for arsenic removal. Materials Letters. 2015;160:412-414.	5 ppm	24.83 As⁺⁵	0.01 g
TiO₂ nanoparticles⁴⁶46 Ramos MLP, González JA, Albornoz SG, Pérez CJ, Villanueva ME, Giorgieri SA, et al. Chitin hydrogel reinforced with TiO2 nanoparticles as an arsenic sorbent. Chemical Engineering Journal. 2016;285:581-587.	0.1 ppm	3.1 As⁺⁵	0.2 gr
Magnetite nanoparticles (this work)	0.066 ppm	0.63 As⁺⁵	0.01 g
Magnetite nanoparticles (this work)	0.134 ppm	1.38 As⁺³	0.01 g

	As⁺⁵		As⁺³
	Concentration 0.036 mg L^-1	Concentration 0.066 mg L^-1	Concentration 0.152 mg L^-1	Concentration 0.164 mg L^-1
Adsorption capacity of a monolayer Q₀ (mg g^-1)	0.338	0.623	1.052	1.219
Langmuir constant K_L (L mg^-1)	-37	-23	-2.4	-1.9
Adsorption capacity q_e (mg g^-1)	0.35	0.63	1.33	1.38
Regression coefficient R²	0.85	0.91	0.97	0.95

	As⁺⁵		As⁺³
	Concentration 0.036 mg L^-1	Concentration 0.066 mg L^-1	Concentration 0.152 mg L^-1	Concentration 0.164 mg L^-1
Adsorption capacity of a monolayer Q₀ (mg g^-1)	0.28	0.54	0.610	0.77
Freundlich constant K_F (L mg^-1)	-32	-36	-5	-6.3
Adsorption capacity q_e (mg g^-1)	0.35	0.63	1.33	1.38
Regression coefficient R²	0.97	0.96	0.98	0.99

	As⁺⁵		As⁺³
	Concentration 0.036 mg L^-1	Concentration 0.066 mg L^-1	Concentration 0.152 mg L^-1	Concentration 0.164 mg L^-1
Adsorption capacity of a monolayer Q₀ (mg g^-1)	0.278	0.528	0.439	0.606
Dubinin constant K_D (L mg^-1)	0.0013	0.0012	0.011	0.0086
Adsorption capacity q_e (mg g^-1)	0.35	0.63	1.33	1.38
Regression coefficient R²	0.96	0.97	0.99	0.99

As ion	Concentration (mg L^-1)	Dubinin Constant (mol² kJ^-2)	Adsorption free Energy (kJ mol^-1)
As⁺⁵	0.036	0.0013	19
As⁺⁵	0.066	0.0012	20
As⁺³	0.152	0.0011	6.7
As⁺³	0.164	0.0086	7.6

As ion	Concentration (mg L^-1)	Langmuir Constant (mol² kJ^-2)	Adsorption free energy (kJ mol^-1)
As⁺⁵	0.036	37	-8.8
As⁺⁵	0.066	23	-7.6
As⁺³	0.152	2.4	-2.14
As⁺³	0.164	1.9	-1.57

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[1] * e-mail: patricia.amezaga@cimav.edu.mx