海藻酸钠表面功能化磁性生物炭对亚甲基蓝的吸附特性

doi:10.19964/j.issn.1006-4990.2023-0180

Abstract

Abstract:

Sodium alginate-modified magnetic biochar（Fe₃O₄@SBC-SA） was prepared from sodium alginate（SA） surface modified magnetic biochar（SBC） to improve the adsorption capacity of biochar for methylene blue（MB）.The apparent morphology and groups of the adsorbents were characterized，and the kinetic，isotherm and thermodynamic studies were used to discuss the adsorption characteristics of methylene blue via Fe₃O₄@SBC-SA.The experimental results showed that Fe₃O₄and SA were successfully loaded onto SBC via the modification process，the MB adsorption property of Fe₃O₄@SBC-SA was better than SBC，the optimum adsorption pH was 7.0，and the adsorption equilibrium was reached at 120 min.The model fitting analysis of the experimental results showed that the adsorption process of methylene blue by Fe₃O₄@SBC-SA was more consistent with the Langmuir model and the quasi-second-order adsorption kinetic equations.The adsorption process was mainly monolayer adsorption and chemical adsorption，and the saturated adsorption capacity reached 172.41 mg/g.Fe₃O₄@SBC-SA adsorption mechanism of methylene blue was mainly through the electrostatic attraction between the carboxyl group and methylene blue.This study had certain practical significance for Fe₃O₄@SBC-SA adsorption treatment of methylene blue in wastewater.

Key words: methylene blue, sodium alginate, bagasse carbon, adsorbent

CLC Number:

X751

LIU Fujie, HE Qian, SU Long, JIANG Caiyun. Adsorption properties of methylene blue by surface functionalized magnetic biochar with sodium alginate[J]. Inorganic Chemicals Industry, 2024, 56(2): 65-73.

Figures/Tables 17

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Table 1

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Table 2

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亚甲基蓝质量浓度/（mg·L^-1）	q_e，exp/ （mg·g^-1）	准一级动力学模型			准二级动力学模型				颗粒内扩散模型
亚甲基蓝质量浓度/（mg·L^-1）	q_e，exp/ （mg·g^-1）	k₁/ min^-1	q_e/ （mg·g^-1）	R²	k₂/ （g·mg^-1·min^-1）	q_e/ （mg·g^-1）	R²		k_d/ （mg·g^-1·min^1/2）	c	R²
100	81.57	0.015 5	11.39	0.961	0.005 7	81.97	0.999	2.70		59.03	0.971
150	106.04	0.013 3	14.85	0.902	0.003 3	106.38	0.999	5.02		64.60	0.963
200	118.80	0.016 9	19.06	0.936	0.002 7	119.05	0.999	3.73		82.45	0.951

温度/ ℃	Langmuir模型			Freundlich模型
温度/ ℃	K_L/ （L·mg^-1）	q_m/（mg·g^-1）	R²	k_F/（mg^1-1/ⁿ · L^1/ⁿ ·g^-1）	n	R²
25	0.005 8	172.41	0.991	26.398 9	3.27	0.987
40	0.006 1	163.93	0.994	22.539 4	3.12	0.989
55	0.006 3	158.73	0.993	16.120 5	2.78	0.990

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Adsorption properties of methylene blue by surface functionalized magnetic biochar with sodium alginate

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