核桃壳炭的制备及其对氨氮废水的吸附性能研究

doi:10.3969/j.issn.1673-5854.2021.01.009

生物质化学工程 ›› 2021, Vol. 55 ›› Issue (1): 63-69.doi: 10.3969/j.issn.1673-5854.2021.01.009

核桃壳炭的制备及其对氨氮废水的吸附性能研究

靳珂, 陆倩, 马来九, 李惠娟(), 史正军

西南林业大学, 西南地区林业生物质资源高效利用国家林业和草原局重点实验室, 云南昆明 650224

收稿日期:2019-12-09 出版日期:2021-01-30 发布日期:2021-01-25
通讯作者: 李惠娟 E-mail:muzilihuijuan@163.com
作者简介:李惠娟, 副教授, 博士, 主要从事生物质材料制备及光催化降解废水研究; E-mail:muzilihuijuan@163.com
靳珂(1999-), 女, 天津人, 本科生, 主要从事生物质炭材料制备及应用研究
基金资助:
云南省农业联合专项基金(2018FG001-051);西南林业大学生物质材料及化学应用精英班创新平台资助项目（无编号）

Preparation of Walnut Shell Carbon and Its Adsorption of Ammonia-nitrogen Wastewater

Ke JIN, Qian LU, Laijiu MA, Huijuan LI(), Zhengjun SHI

Key Laboratory of National Forestry and Grassland Administration on Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China(Southwest Forestry University), Kunming 650224, China

Received:2019-12-09 Online:2021-01-30 Published:2021-01-25
Contact: Huijuan LI E-mail:muzilihuijuan@163.com

摘要/Abstract

摘要：

为解决当前氨氮废水污染问题，以自制核桃壳炭为吸附剂，以NH₄⁺为模型吸附分子，考察了核桃壳预处理方式、焙烧温度、焙烧时间和铵根离子初始浓度等对氨氮废水吸附的影响，并采用多种手段对核桃壳炭进行表征。研究结果表明：经H₃PO₄预处理后于700℃焙烧2 h制备的核桃壳炭对低浓度的NH₄⁺具有优异的吸附能力；当铵根离子初始质量浓度为8 mg/L，100 mL NH₄⁺溶液中加入核桃壳炭2 g，吸附时间为240 min时，NH₄⁺去除率达93.41%；核桃壳炭吸附氨氮符合准二级动力学模型。比表面积和孔径分析结果表明：经H₃PO₄预处理后制备的核桃壳炭的比表面积为269.18 m²/g，总孔容积为0.173 6 cm³/g，微孔容积为0.125 cm³/g，平均孔径为5.46 nm。FT-IR、XRD和SEM分析表明：经H₃PO₄预处理制备的核桃壳炭为石墨碳晶相，表面呈现石墨片层结构，从而使其具有良好的NH₄⁺的吸附性能。

关键词: 核桃壳炭, 氨氮, 吸附性, 废水

Abstract:

Aiming at the problem of ammonia-nitrogen wastewater pollution, walnut shell carbon was used as adsorbent, and the NH₄⁺ was used as model adsorption molecules. The effects of pretreatment conditions of walnut shell, roasting temperature, roasting time and initial concentration of ammonium ion on the adsorption of ammonia-nitrogen wastewater were investigated. The results showed that walnut shell carbon modified by H₃PO₄ (700℃, 2 h) had excellent adsorption capacity for low concentration NH₄⁺. When the initial concentration of NH₄⁺ was 0.8 mg/L, the amount of walnut shell carbon was 2 g/L and the adsorption time was 240 min, the adsorption rate was 93.41%. Adsorption of ammonium ion by walnut shell charcoal accorded with pseudo-second-order kinetics model. The specific surface area of the walnut shell carbon obtained by H₃PO₄ pretreatment was 269.18 m²/g, the total pore volume was 0.173 6 cm³/g, the micropore volume was 0.125 0 cm³/g and the average pore size was 5-46 nm. Phase characterization of walnut shell charcoal was carried out by infrared (IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that walnut shell carbon modified by H₃PO₄ (700℃, 2 h) was graphite-carbon crystalline phase with graphite lamellar structure on its surface which resulted in good adsorption.

Key words: walnut shell carbon, ammonia-nitrogen ion, adsorption, wastewater

中图分类号:

TQ35

靳珂, 陆倩, 马来九, 李惠娟, 史正军. 核桃壳炭的制备及其对氨氮废水的吸附性能研究[J]. 生物质化学工程, 2021, 55(1): 63-69.

Ke JIN, Qian LU, Laijiu MA, Huijuan LI, Zhengjun SHI. Preparation of Walnut Shell Carbon and Its Adsorption of Ammonia-nitrogen Wastewater[J]. Biomass Chemical Engineering, 2021, 55(1): 63-69.

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预处理 pretreatment	比表面积/(m²·g^-1) BET specific surface area	微孔面积/(m²·g^-1) micropore area	总孔容积/(cm³·g^-1) total pore volume	微孔容积/(cm³·g^-1) micropore volume	平均孔径/nm average pore size
未处理untratment	25.71	4.21	0.0757	0.0119	6.93
KOH	81.94	36.35	0.1260	0.0188	11.78
H₃PO₄	269.18	241.34	0.1736	0.1250	5.46

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核桃壳炭的制备及其对氨氮废水的吸附性能研究

Preparation of Walnut Shell Carbon and Its Adsorption of Ammonia-nitrogen Wastewater

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