Adsorption of Cr(VI) from Aqueous Solution by Biochar-clay Derived from Clay and Peanut Shell

Hai WANG; Ningcan YANG; Muqing QIU

doi:10.15541/jim20190350

Journals >Journal of Inorganic Materials >Volume 35 >Issue 3 >Page 301 > Article

Journal of Inorganic Materials
Vol. 35, Issue 3, 301 (2020)

Adsorption of Cr(VI) from Aqueous Solution by Biochar-clay Derived from Clay and Peanut Shell

Hai WANG, Ningcan YANG, and Muqing QIU^*

Author Affiliations

School of Life Science, Shaoxing University, Shaoxing 312000, China

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DOI: 10.15541/jim20190350 Cite this Article

Hai WANG, Ningcan YANG, Muqing QIU. Adsorption of Cr(VI) from Aqueous Solution by Biochar-clay Derived from Clay and Peanut Shell[J]. Journal of Inorganic Materials, 2020, 35(3): 301 Copy Citation Text

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. SEM images of the Biochar@Kaolin and Biochar@Bentonite before and after the reaction with Cr(VI)

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. TEM images of the Biochar@Kaolin and Biochar@Bentonite before and after the reaction with Cr(VI)

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. EDS spectra of the Biochar@Kaolin and Biochar@Bentonite before and after the reaction with Cr(VI)

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. XRD patterns of Biochar, Biochar@Kaolin and Biochar@Bentonite

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. FT-IR spectra of Biochar, Kaolin, Bentonite, Biochar@Kaolin and Biochar@Bentonite

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. XPS spectra of Biochar@Kaolin (a) and Biochar@Bentonite (b)

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. Effect of pH on the removal of Cr (VI) by the Biochar@Kaolin (a) and Biochar@Bentonite (b)

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. Effect of SO₄^2- on the removal of Cr (VI) by the Biochar@Kaolin (a) and Biochar@Bentonite (b)

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. Adsorption data and modeling for Cr(VI) ions removal by Biochar, Biochar@Kaolin and Biochar@Bentonite, respectively

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Sample	BET specific surface area/(m²·g^-1)	Average pore width/nm
Biochar	2.79	39.37
Biochar@Kaolin	6.15	83.41
Biochar@Bentonite	3.08	56.18

Table 1.

Characterizations of Biochar, Biochar@Kaolin and Biochar@Bentonite

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Sample	Pseudo-first-order			Pseudo-second-order
Sample	q_e/(mg·g^-1)	k₁/min^-1	R²	q_e/(mg·g^-1)	K₂/(g·mg^-1·min^-1)	R²
Biochar	6.54	0.056	0.967	7.80	0.063	0.990
Biochar@Kaolin	7.07	0.092	0.947	8.91	0.122	0.986
Biochar@Bentonite	7.70	0.048	0.971	9.41	0.052	0.991

Table 2.

Pseudo-first order kinetic and pseudo-second order kinetic parameters of Cr(VI) ions removal by Biochar, Biochar@Kaolin and Biochar@Bentonite

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T/℃	Sample	Langmuir adsorption model			Freundlich adsorption model
T/℃	Sample	Q_max/(mg·g^-1)	K_L/(L·mg^-1)	R²	K_F/((mg·g)^-1/ⁿ)	1/n	R²
20	Biochar@Kaolin	15.58	0.0029	0.978	3.57	0.0064	0.995
20	Biochar@Bentonite	20.54	0.035	0.980	6.75	0.0042	0.903
30	Biochar@Kaolin	68.98	0.0063	0.940	4.55	0.0083	0.992
30	Biochar@Bentonite	23.64	0.058	0.967	10.53	0.0033	0.942
40	Biochar@Kaolin	76.62	0.13	0.795	9.61	0.0028	0.996
40	Biochar@Bentonite	27.23	0.28	0.956	14.82	0.0016	0.852

Table 3.

Parameters of adsorption isotherms for Cr(VI) ions removal by Biochar, Biochar@Kaolin and Biochar@Bentonite at 20, 30 and 40 ℃, respectively

Hai WANG, Ningcan YANG, Muqing QIU. Adsorption of Cr(VI) from Aqueous Solution by Biochar-clay Derived from Clay and Peanut Shell[J]. Journal of Inorganic Materials, 2020, 35(3): 301

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