Preparation of Nitrogen-doped Biochar and its Adsorption Capacity for Co2+

doi:10.11901/1005.3093.2022.231

Chinese Journal of Materials Research

2023, Vol. 37

Issue (4): 291-300 DOI: 10.11901/1005.3093.2022.231

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Preparation of Nitrogen-doped Biochar and its Adsorption Capacity for Co²⁺

YU Moxin¹^,², ZHANG Shuhai¹, ZHU Bowen¹, ZHANG Chen¹, WANG Xiaoting¹^,³(

), BAO Jiamin¹, WU Xiang¹

^1.School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan 243000, China
^2.Sinosteel New Materials Co. Ltd., Ma'anshan 243000, China
^3.Magang (Group) Holding Co. Ltd., Ma'anshan 243003, China

Cite this article:

YU Moxin, ZHANG Shuhai, ZHU Bowen, ZHANG Chen, WANG Xiaoting, BAO Jiamin, WU Xiang. Preparation of Nitrogen-doped Biochar and its Adsorption Capacity for Co²⁺. Chinese Journal of Materials Research, 2023, 37(4): 291-300.

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Abstract

The nitrogen-doped biochar (NBC _x ) was prepared from aloe vera leaf rind with adding urea as nitrogen source, namely the biochar (NBC _x ) was first prepared by hydrothermal method, and then the mixture of NBC _x and urea was pyrolyzed at different temperatures. The as-made NBC _x was characterized by SEM、BET、XPS、FTIR and Zeta, and its application for adsorption of Co²⁺ in waste water was investigated. The results show that the NBC _x has a hierarchical porous structure with a lamellar-like surface with many small flakes. The NBC₈₀₀, prepared with the mass ratio 2∶1 for aloe vera leaf rind to urea by final pyrolysis temperature of 800℃, presents a specific surface area of 32 m²·g^-1, and a total pore volume of 0.04 cm³·g^-1 with the non-microporous ratio of up to 75%. The surface of NBC₈₀₀ is rich in oxygen and nitrogen functional groups, and the content of N and O (mole fraction) is up to 3.89% and 46.35% respectively, which can react with Co²⁺ through ion exchange, electrostatic adsorption, complexation and co-precipitation. The Langmuir model fits well with the adsorption isotherm of Co²⁺ on NBC _x, which demonstrated that the adsorption is monolayered. The maximum adsorption capacity of Co²⁺ on NBC₈₀₀ is up to 228.31 mg·g^-1. The quasi-second-order kinetic model can describe the adsorption process better. The adsorption rate is mainly controlled by chemical adsorption.

Key words: inorganic non-metallic materials aloe vera leaf rind biochar N-doped Co²⁺ chemical adsorption

Received: 24 April 2022

ZTFLH:

O647.3

Fund: Anhui Province Postdoctoral Science Research Program(2021B547);Natural Science Research Project of Anhui Province(KJ2021A0399)

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	YU Moxin
	ZHANG Shuhai
	ZHU Bowen
	ZHANG Chen
	WANG Xiaoting
	BAO Jiamin
	WU Xiang

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.231 OR https://www.cjmr.org/EN/Y2023/V37/I4/291

Fig.1 SEM images of the samples NBC₆₀₀ (a), NBC₇₀₀ (b), NBC₈₀₀ (c) and NBC₈₀₀⁃Co²⁺ (d)

Fig.2 N₂adsorption-desorption isotherm of NBC _x

Fig.3 Pore size distribution of NBC _x

Table 1 Specific surface area and pore structure parameters of NBC _x

Fig.4 XPS spectra of the samples (a) survey spectra of NBC₈₀₀; (b) O1s spectrum of NBC₈₀₀; (c) N1s spectrum of NBC₈₀₀; (d) survey spectra of NBC₈₀₀-Co²⁺; (e) O1s spectrum of NBC₈₀₀-Co²⁺; (f) N1s spectrum of NBC₈₀₀-Co²⁺; (g) Co2p spectrum of NBC₈₀₀-Co²⁺

Table 2 Elements content of XPS analysis (mole fraction, %)

Table 3 Functional group content of O1s spectrum, N1s spectrum and Co2p spectrum in XPS analysis (mole fraction, %)

Fig.5 FTIR diagram of NBC₈₀₀ before and after Co²⁺ adsorption

Fig.6 Zeta potential diagram of NBC _x

Fig.7 Adsorption isotherm of Co²⁺ by NBC _x and Langmuir model fitting (a) adsorption isotherm curve; (b) Langmuir model fitting diagram

Fig.8 Adsorption kinetics curve of Co²⁺ by NBC _x and fitting of pseudo-second-order kinetics model (a) adsorption kinetics curve; (b) fitting diagram of pseudo-second-order dynamics model

Fig.9 Breakthrough curve for Co²⁺ dynamic adsorption on NBC₈₀₀

Fig.10 Curve of effect of NBC₈₀₀ mass on Co²⁺ adsorption

Fig.11 Adsorption mechanism of Co²⁺ on NBC _x

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