Distinguished Cd(II) Capture with Rapid and Superior Ability using Porous Hexagonal Boron Nitride: Kinetic and Thermodynamic Aspects

Li LI; Xiaojie GUO; Yang JIN; Chaogui CHEN; M Asiri Abdullah; M Marwani Hadi; Qingzhou ZHAO; Guodong SHENG

doi:10.15541/jim20190371

Journals >Journal of Inorganic Materials >Volume 35 >Issue 3 >Page 284 > Article

Journal of Inorganic Materials
Vol. 35, Issue 3, 284 (2020)

Distinguished Cd(II) Capture with Rapid and Superior Ability using Porous Hexagonal Boron Nitride: Kinetic and Thermodynamic Aspects

Li LI¹, Xiaojie GUO², Yang JIN¹, Chaogui CHEN^1、*, M Asiri Abdullah³, M Marwani Hadi³, Qingzhou ZHAO⁴, and Guodong SHENG^1、*

Author Affiliations

¹College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China

²College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China

³Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia

⁴College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.15541/jim20190371 Cite this Article

Li LI, Xiaojie GUO, Yang JIN, Chaogui CHEN, M Asiri Abdullah, M Marwani Hadi, Qingzhou ZHAO, Guodong SHENG. Distinguished Cd(II) Capture with Rapid and Superior Ability using Porous Hexagonal Boron Nitride: Kinetic and Thermodynamic Aspects[J]. Journal of Inorganic Materials, 2020, 35(3): 284 Copy Citation Text

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. Energy spectrum analysis (ESA) for unidentified black dots adsorbed on p-BN

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. (A) SEM and (B) HRTEM images of p-BN, (C) SEM and (D) HRTEM images of p-BN after adsorption, (E) EDS analysis and (F) high-magnification HRTEM image of p-BN after adsorption

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. XRD patterns (A) and FT-IR spectra (B) of p-BN before and after adsorption

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. BET measurement of p-BN

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. (A) Effect of initial pH on Cd(II) adsorption capacity (q_e) and adsorption percentage at equilibrium, and (B) effect of p-BN dosage on the adsorption capacity (q_e) and adsorption percentage of Cd(II)

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. Variation of distribution of Cd(II) hydrolyzate species with pH

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. (A) Adsorption capacities of Cd(II) with various contact times at different initial concentrations of Cd(II), and (B) adsorption percentages of Cd(II) on p-BN with various contact time at different initial concentrations of Cd(II)

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. Kinetics models for adsorption of Cd(II) on p-BN

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. (A) Adsorption isotherms of Cd(II) on p-BN at T=303, 313 and 323 K, equilibrium adsorption isotherms fitted by (B) Langmuir model, (C) Freundlich model, (D) Tempkin model

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. Linear plots of lnK_dversus 1/T for Cd(II) adsorption on p-BN adsorbent

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. (A) XPS surveys for p-BN and adsorbed p-BN(inset: high resolution Cd3d XPS spectrum and background); (B) Experimental bonding enerygy peaks of Cd(II) and the comparisons of primary peaks of Cd3d_5/2 and Cd3d_3/2 for free Cd(II), CdCO₃, Cd(OH)₂

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. High resolution spectra of B1s (a) and O1s (b) for p-BN before and after adsorption

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Cd(II)/p-BN	Model
Cd(II)/p-BN	Pseudo-first-order		Pseudo-second-order		Intra-particle diffusion		Liquid-film diffusion
Parameters	q_e,cal=/(mg·g^-1)	111.7	q_e,cal=/(g·mg^-1·h^-1)	193.1	I	60.2	K_f/h^-1	0.524
	K₁^-1	0.524	K₂(g·mg^-1·h^-1)	1.00×10^-3	k_d/(g·mg^-1·h^-1/2)	49.4	A	-0.499
	R²	0.948	R²	0.999	R²	0.872	R²	0.948

Table 1.

Adsorption kinetics models parameters

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Modelparameter		Langmuir model			Freundlich model			Tempkin model
Modelparameter		q_m/(mg·g^-1)	K_L/(L·mg^-1)	R²	1/n	K_F	R²	K_T/(L·mg^-1)	f	R²
T/K	303	236	0.112	0.984	0.229	1.27	0.987	43.1	2.19	0.987
	313	256	0.126	0.968	0.225	1.29	0.989	49.1	2.00	0.984
	323	290	0.121	0.983	0.223	1.32	0.994	58.3	1.63	0.991

Table 1.

Adsorption isotherm models parameters of Cd(II) on p-BN

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Adsorbate	C₀/(mg·L^-1)	ΔH^θ/(kJ·mol^-1)	ΔS^θ/(J·mol^-1·K^-1)	ΔG^θ/(kJ·mol^-1)
Adsorbate	C₀/(mg·L^-1)	ΔH^θ/(kJ·mol^-1)	ΔS^θ/(J·mol^-1·K^-1)	303 K	313 K	323 K
Cd(II)	50	16.51	72.81	-5.55	-6.28	-7.01
	60	17.58	73.40	-4.66	-5.39	-6.13
	70	14.25	61.39	-4.35	-4.97	-5.58
	80	16.21	66.54	-3.95	-4.62	-5.28
	90	16.08	64.60	-3.49	-4.14	-4.79