Co-modification of Biochar and Bentonite for Adsorption and Stabilization of Pb2+ ions

Yao XIAO; Zhongjie WU; Mei CUI; Rongxin SU; Lianke XIE; Renliang HUANG

doi:10.15541/jim20200745

Journals >Journal of Inorganic Materials >Volume 36 >Issue 10 >Page 1083 > Article

Journal of Inorganic Materials
Vol. 36, Issue 10, 1083 (2021)

Co-modification of Biochar and Bentonite for Adsorption and Stabilization of Pb²⁺ ions

Yao XIAO¹, Zhongjie WU², Mei CUI³, Rongxin SU^3、4, Lianke XIE², and Renliang HUANG^4、*

Author Affiliations

¹1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China

²2. Shandong Electric Power Research Institute of Chinese Power Company, Jinan 250002, China

³3. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

⁴4. School of Marine Science and Technology, Tianjin University, Tianjin 300072, China

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DOI: 10.15541/jim20200745 Cite this Article

Yao XIAO, Zhongjie WU, Mei CUI, Rongxin SU, Lianke XIE, Renliang HUANG. Co-modification of Biochar and Bentonite for Adsorption and Stabilization of Pb²⁺ ions [J]. Journal of Inorganic Materials, 2021, 36(10): 1083 Copy Citation Text

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1. SEM images of three biochars

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2. XRD patterns of CB,CaO-CB and CaO-Bent-CB

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3. FT-IR spectra of CB,CaO-CB and CaO-Bent-CB

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4. Effect of different adsorbents on the removal of Pb²⁺ in the solution

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5. Effect of solution pH on the absorption quatity and removal of Pb²⁺by CaO-Bent-CB

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6. Effect of ionic strength on the removal of Pb²⁺ in the solution by CaO-Bent-CB

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7. Effect of bentonite loading on the absorption quatity and removal of Pb²⁺ by CaO-Bent-CB

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8. Adsorption kinetic curves for Pb²⁺ removal by CaO-Bent-CB

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9. Adsorption isotherm curves for Pb²⁺ removal by CaO-Bent-CB

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10. Lead concentrations in acid leachate with different adsorbents

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Sample	Specific surface area/(m²·g^-1)	Average pore width/nm
CB	132.72	3.06
CaO-CB	177.22	3.63
CaO-Bent-CB	441.06	3.78

Table 1. Specific surface area and pore size of biochars

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Sample	Q_e/(mg·g^-1)	Pseudo first-order kinetic model		Pseudo second-order kinetic model		Intraparticle diffusion kinetic model
Sample	Q_e/(mg·g^-1)	R²	k₁/min^-1	R²	k₂/(g·mg^-1·min^-1/2)	R²	k_id/(g·mg^-1·min^-1/2)
CaO-Bent-CB	88.616	0.887	0.0284	0.983	0.000484	0.851	1.923

Table 2. Parameters of the kinetic model for the adsorption of Pb²⁺ by CaO-Bent-CB

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Sample	Q_max/(mg·g^-1)	Langmuir adsorption model		Freundlich adsorption model		Temkin adsorption model
Sample	Q_max/(mg·g^-1)	R²	K_L/(L·g^-1)	R²	K_F/(mg·g^-1)	R²	K_T/(mg·g^-1)	B
CaO-Bent-CB	232.167	0.989	0.00102	0.988	1.238	0.968	77.395	0.0671

Table 3. Thermodynamic parameters of the adsorption of Pb²⁺ by CaO-Bent-CB according to models

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