Study the Adsorption of Nitrate in Water by Cobalt⁃Iron Layered Bimetal⁃Loaded Biochar

doi:10.12422/j.issn.1006-396X.2024.02.003

Abstract

Abstract:

Rising levels of nitrate and nitrogen in water bodies pose a potential threat to aquatic ecosystems and human health. Therefore, it is urgent to solve the problem of excessive nitrate in water bodies. Fe(NO₃)₃·9H₂O, Co(NO₃)₂·6H₂O, reed biochar, NH₃·H₂O was used as raw material, and co-precipitation method was used to load cobalt-iron layered bimetals onto reed biochar to prepare Co/Fe-LDH@BC for adsorption of excess nitrate nitrogen in water. The experimental results showed that Co/Fe-LDH@BC could effectively adsorb nitrate nitrogen in water, and its adsorption capacity was 88.52 mg/g. The adsorption kinetic model conforms to the pseudo-second-order kinetic model, and the isotherm conforms to the Langmuir isotherm model, indicating that the adsorption reaction is spontaneous and endothermic, which mainly involves four reaction mechanisms: ion exchange, ligand exchange, electrostatic attraction and hydrogen bonding. In addition, Co/Fe-LDH@BC has a strong affinity for nitrate nitrogen in most water bodies where coexisting anions are present, making it suitable for practical applications.

Key words: Biochar, Cobalt?iron layered bimetal, Nitrate, Co?precipitation, Adsorption

摘要：

水体中的硝氮质量浓度不断升高，对水生态系统和人类健康存在潜在威胁。因此，解决水体中过量硝氮的问题刻不容缓。以Fe(NO₃)₃·9H₂O、Co(NO₃)₂·6H₂O、芦苇生物炭、NH₃·H₂O为原料，采用共沉淀法将钴铁层状双金属负载到芦苇生物炭上，制备了可用于吸附水体中过量硝氮的Co/Fe-LDH@BC。结果表明，Co/Fe-LDH@BC可有效吸附水体中的硝氮，其吸附量为88.52 mg/g；吸附动力学模型符合伪二级动力学模型，等温线符合Langmuir等温线模型，说明吸附反应为自发的、吸热的，主要涉及离子交换、配体交换、静电吸引、氢键四种反应机理；Co/Fe-LDH@BC在大多数共存阴离子的水体中对硝氮具有很强的亲和力，具有实际应用价值。

关键词: 生物炭, 钴铁层状双金属, 硝氮, 共沉淀, 吸附

CLC Number:

TQ031

Ruiming YANG, Yani TANG, Jingwen LI, Chao FEI, Bo WANG. Study the Adsorption of Nitrate in Water by Cobalt⁃Iron Layered Bimetal⁃Loaded Biochar[J]. Journal of Petrochemical Universities, 2024, 37(2): 16-23.

杨蕊铭, 唐雅妮, 李婧雯, 费超, 王博. 钴铁层状双金属负载生物炭对水体硝氮的吸附研究[J]. 石油化工高等学校学报, 2024, 37(2): 16-23.

Figures/Tables 10

Fig.1 SEM images of BC and Co/Fe?LDH@BC

Fig. 2 Adsorptive dynamics equation fitting curve

Table 1 Kinetic parameters of nitrate removal by Co/Fe?LDH@BC

模型	参数	数值
模型	参数	288 K	298 K	308 K
伪一级动力学	k₁/min^-1	0.785 4	0.943 7	0.706 9
	Q $e a$ /（mg·g^-1)	21.40	23.29	23.60
	Q $e b$ /（mg·g^-1)	21.27	22.82	23.42
	R²	0.998 3	0.998 9	0.999 4
伪二级动力学	k₂/（L·mol^-1·min^-1)	0.210 8	0.410 5	0.270 5
	Q $e b$ /（mg·g^-1)	23.60	22.94	21.42
	R²	0.999 9	0.999 2	0.998 9

Table 1 Kinetic parameters of nitrate removal by Co/Fe?LDH@BC

模型	参数	数值
模型	参数	288 K	298 K	308 K
伪一级动力学	k₁/min^-1	0.785 4	0.943 7	0.706 9
	Q $e a$ /（mg·g^-1)	21.40	23.29	23.60
	Q $e b$ /（mg·g^-1)	21.27	22.82	23.42
	R²	0.998 3	0.998 9	0.999 4
伪二级动力学	k₂/（L·mol^-1·min^-1)	0.210 8	0.410 5	0.270 5
	Q $e b$ /（mg·g^-1)	23.60	22.94	21.42
	R²	0.999 9	0.999 2	0.998 9

Fig.3 Adsorption isothermal model of Langmuir and Freundlich

Table 2 Thermodynamic parameters of Co/Fe?LDH@BC adsorption of nitrate nitrogen

模型	参数	数值
模型	参数	288 K	298 K	308 K
Langmuir	Q_m/（mg·g^-1)	92.03	67.85	88.52
	K_L/（L·mg^-1)	0.232 5	0.712 3	0.598 4
	R_L	0.146 8~0.682 6	0.053 2~0.412 4	0.062 7~0.455 2
	R²	0.985 7	0.992 6	0.980 1
Freundlich	1/n	0.634 3	0.493 1	0.585 2
	K_F/[mg·g^-1(L·min)^-1/ⁿ ]	18.283 9	25.832 4	30.952 5
	R²	0.992 7	0.961 3	0.957 6

Fig.4 Effect of dosage on adsorption

Fig.5 Effect of pH on adsorption

Fig.6 Effect of coexisting anions on adsorption

Fig.7 XRD spectra of BC and Co/Fe?LDH@BC

Fig.8 FT?IR images of BC and Co/Fe?LDH@BC before and after adsorption

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