Adsorption Property of Moringa Seed Shell Biochar to Cu2+ in Solution

doi:10.11924/j.issn.1000-6850.casb20191100853

Abstract

Abstract:

To reveal the adsorption performance of Moringa seed shell biochar to Cu²⁺, Moringa seed shell was used as raw material to prepare biochar under 1000℃ pyrolysis and modified with KOH. The equilibrium adsorption method was adopted to study the adsorption mechanism of Cu²⁺ by the biochar before and after modification. The results showed that the adsorption efficiency of modified Moringa seed shell biochar was better than that that of unmodified biochar under the same adsorption condition of pH 7.0. The adsorption process was in accordance with the Langmuir isothermal adsorption model and the quasi-second-order kinetic model. The difference was related to the specific surface area, pore structure and aromatic structure of the biochar as well as the content of SiO₂. The research indicates that the prepared Moringa seed shell biochar has a good removal effect on Cu²⁺ in a certain range.

Key words: Moringa seed shell, biochar, activating agent, Cu²⁺, adsorption property

CLC Number:

X703

Li Meiping, Dong Cheng, Wang Wei, Zhang Shengwan, Zhang Jincai. Adsorption Property of Moringa Seed Shell Biochar to Cu²⁺ in Solution[J]. Chinese Agricultural Science Bulletin, 2020, 36(34): 84-89.

Figures/Tables 9

References 25

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	比表面积/(m²/g)	单位孔隙体积/(cm³/g)	平均孔径/nm
改性前	32.33	0.02045	2.531
改性后	1276	0.7219	2.263

	比表面积/(m²/g)	单位孔隙体积/(cm³/g)	平均孔径/nm
改性前	32.33	0.02045	2.531
改性后	1276	0.7219	2.263

生物炭	Langmuir模型				Freundlich模型
生物炭	q_m/(mg/g)	K_L/(L/mg)	R²	ΔG/(kJ/mol)	n	K_F	R²
改性前	101.94	0.0938	0.9967	-11.07	2.2364	13.06	0.9887
改性后	111.23	0.3205	0.9975	-14.06	3.7301	34.27	0.9795

生物炭	Langmuir模型				Freundlich模型
生物炭	q_m/(mg/g)	K_L/(L/mg)	R²	ΔG/(kJ/mol)	n	K_F	R²
改性前	101.94	0.0938	0.9967	-11.07	2.2364	13.06	0.9887
改性后	111.23	0.3205	0.9975	-14.06	3.7301	34.27	0.9795

生物炭	平衡吸附量/(mg/g)	准一级动力学方程			准二级动力学方程
生物炭	平衡吸附量/(mg/g)	饱和吸附量/(mg/g)	k₁	R²	饱和吸附量/(mg/g)	k₂	R²
改性前	8.94	0.28	6.9×10^-3	0.6809	8.85	0.0430	0.9986
改性后	9.12	0.02	1.4×10^-3	0.6809	9.23	0.1274	0.9997

Adsorption Property of Moringa Seed Shell Biochar to Cu²⁺ in Solution

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重金属离子	生物炭制备源	平衡时间/h	最大吸附量/(mg/g)	文献来源
Cu²⁺	硬木	4	6.79	文献[23]
	玉米秸秆	8	12.52	文献[23]
	牛粪	10	54.4	文献[24]
	互花米草	30	48.49	文献[25]
	辣木籽壳	0.167	111.23	本研究

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