镧改性核桃壳生物炭制备及吸附水体磷酸盐性能

doi:10.16085/j.issn.1000-6613.2020-0753

化工进展 ›› 2021, Vol. 40 ›› Issue (2): 1121-1129.DOI: 10.16085/j.issn.1000-6613.2020-0753

镧改性核桃壳生物炭制备及吸附水体磷酸盐性能

罗元¹^,²^,³(), 谢坤¹^,³, 冯弋洋¹^,²^,³, 何秋平¹^,³, 张克强¹^,³, 沈仕洲¹^,³, 王风¹^,³()

^1.农业农村部环境保护科研监测所，天津 300191
^2.云南农业大学资源与环境学院，云南昆明 650201
^3.农业农村部大理农业环境科学观测实验站，云南大理 671004

收稿日期:2020-05-04 修回日期:2020-06-24 出版日期:2021-02-05 发布日期:2021-02-09
通讯作者: 王风
作者简介:罗元（1995－），男，硕士研究生，研究方向为农业面源污染防治。E-mail：ly234132@163.com。
基金资助:
国家重点研发计划(2017YFD0800403);中央级公益性科研院所基本科研业务费专项(C2112060302008086)

Preparation of lanthanum modified walnut shell biochar and adsorption of phosphate from aqueous solutions

Yuan LUO¹^,²^,³(), Kun XIE¹^,³, Yiyang FENG¹^,²^,³, Qiuping HE¹^,³, Keqiang ZHANG¹^,³, Shizhou SHEN¹^,³, Feng WANG¹^,³()

^1.Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
^2.College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, Yunnan, China
^3.Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, Yunnan, China

Received:2020-05-04 Revised:2020-06-24 Online:2021-02-05 Published:2021-02-09
Contact: Feng WANG

摘要/Abstract

摘要：

为研发低成本的磷酸盐吸附剂，以核桃壳为原料，LaCl₃为改性试剂热解制备核桃壳生物炭。通过SEM-EDS、ICP-OES、FTIR和XRD对生物炭进行表征，采用吸附等温模型和动力学模型拟合生物炭的吸磷特征，并研究热解温度、La改性浓度、添加量、初始溶液pH和共存离子对生物炭吸附磷的影响。结果表明：La改性后，生物炭表面由于负载了La₂O₃和LaOCl，其吸附能力明显提高。热解温度为400℃、La浸渍浓度为0.1mol/L时获得的生物炭（BC-La400），其Langmuir最大磷吸附容量为12.18mg/g，吸附过程主要受化学吸附和颗粒内扩散控制。热解温度和La改性浓度过高均不利于磷的吸附。磷初始浓度为50mg/L时，BC-La400添加量为2.7g/L可获得较理想的吸附能力，但当添加量超过4.0g/L时，磷脱除率可超过98%。BC-La400吸磷时最佳初始pH为3，CO $3 2 -$ 共存会明显削弱BC-La400对磷的吸附能力。

关键词: 生物炭, 磷酸盐, 吸附, 核桃壳, 模型, 制备

Abstract:

To prepare phosphate adsorbent with low cost, biochar was prepared by means of heating walnut shell with LaCl₃ as modified reagent. Biochar was characterized by SEM-EDS, ICP-OES, FTIR and XRD. Adsorption isotherm model and kinetic model were used to fit the phosphorus absorption characteristics of biochar, and effects of pyrolysis temperature, La modification concentration, additive amount, initial solution pH and co-existing ions on biochar absorbing phosphorus were studied. The results indicated that the adsorption capacity of La modified biochar can be significantly improved because La₂O₃ and LaOCl was loaded on its surface. The fine biochar (BC-La400) with the Langmuir maximum phosphorus adsorption capacity of 12.18mg/g can be obtained at pyrolysis temperature of 400℃ and La modification concentration of 0.1mol/L. Adsorption process was mainly controlled by chemical adsorption and intra particle diffusion. When the initial phosphorus concentration was 50mg/L, the optimal concentration of BC-La400 was 2.7g/L. However, after the concentration exceeded 4.0g/L, the phosphorus removal efficiency was above 98%. The optimal initial pH for phosphorus adsorption by BC-La400 was 3. The coexistence of carbonate ions can significantly weaken the adsorption capacity of BC-La400 to phosphorus.

Key words: biochar, phosphate, adsorption, walnut shell, model, preparation

中图分类号:

罗元, 谢坤, 冯弋洋, 何秋平, 张克强, 沈仕洲, 王风. 镧改性核桃壳生物炭制备及吸附水体磷酸盐性能[J]. 化工进展, 2021, 40(2): 1121-1129.

Yuan LUO, Kun XIE, Yiyang FENG, Qiuping HE, Keqiang ZHANG, Shizhou SHEN, Feng WANG. Preparation of lanthanum modified walnut shell biochar and adsorption of phosphate from aqueous solutions[J]. Chemical Industry and Engineering Progress, 2021, 40(2): 1121-1129.

图/表 17

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元素	质量分数/%	原子分数/%
C	56.47	78.21
O	16.78	17.44
Cl	3.28	1.54
La	23.47	2.81

元素	质量分数/%	原子分数/%
C	56.47	78.21
O	16.78	17.44
Cl	3.28	1.54
La	23.47	2.81

准一级动力学模型				准二级动力学模型
k₁/h^-1	q_e/mg·g^-1	R²		k₂/g·mg^-1·h^-1	q_e/mg·g^-1	R²
0.4450	11.04	0.8676		0.0567	11.94	0.9422

准一级动力学模型				准二级动力学模型
k₁/h^-1	q_e/mg·g^-1	R²		k₂/g·mg^-1·h^-1	q_e/mg·g^-1	R²
0.4450	11.04	0.8676		0.0567	11.94	0.9422

准一级动力学模型				准二级动力学模型				准三级动力学模型
k_d1/mg·g^-1·h^-1/2	c₁	R²		k_d2/mg·g^-1·h^-1/2	c₂	R²		k_d3/mg·g^-1·h^-1/2	c₃	R²
5.1189	0.5959	0.9999		2.0320	3.6247	0.9792		0.7361	7.5810	0.7618

镧改性核桃壳生物炭制备及吸附水体磷酸盐性能

Preparation of lanthanum modified walnut shell biochar and adsorption of phosphate from aqueous solutions

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图/表 17

参考文献 40

相关文章 15

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Metrics

本文评价

Langmuir				Freundlich
q_max/mg·g^-1	K_L/L·mg^-1	R²		n	K_F/mg·g^-1·L^1/n·mg^-1/n	R²
12.18	16.69	0.9875		7.8095	9.9218	0.9061

吸附剂	热解温度 /℃	La与原料质量比	理论吸附量 /mg·g^-1	参考文献
La改性稻壳生物炭	800	0.20	45.62	[34]
La改性橡木生物炭	500	0.35	46.53	[35]
La/Fe改性菠萝皮生物炭	300	1.39	101.16	[36]
BC-La400	400	0.07	12.18	本研究
La改性膨润土	Nd	Nd	10.19	[37]
La/Al改性蒙脱石	Nd	Nd	13.02	[38]
La改性刺柏纤维素	Nd	0.83	10.89	[39]
La改性符山石	Nd	0.16	6.70	[40]

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