炭化温度对牛粪生物炭结构性质的影响

doi:10.3969/j.issn.1004-1524.2018.09.17

浙江农业学报 ›› 2018, Vol. 30 ›› Issue (9): 1561-1568.DOI: 10.3969/j.issn.1004-1524.2018.09.17

炭化温度对牛粪生物炭结构性质的影响

黄惠群^{1, 2}, 蔡文昌¹, 张健瑜¹, 李灿¹, 曾和平^{1, *}

1.昆明理工大学环境科学与工程学院,云南昆明 650500;
2.广东省生态环境技术研究所,广东广州 510650

收稿日期:2017-10-04 出版日期:2018-09-25 发布日期:2018-10-15
作者简介:黄惠群(1989—),男,湖南邵阳人,硕士研究生,研究方向为生物质废弃物及其环境效应。E-mail: 978344016@qq.com

Effects of carbonization temperatures on structure and properties of cow dung biochars

HUANG Huiqun^{1, 2}, CAI Wenchang¹, ZHANG Jianyu¹, LI Can¹, ZENG Heping^{1, *}

1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;
2. Guangdong Institute of Eco-Environment and Soil Science, Guangzhou 510650, China

Received:2017-10-04 Online:2018-09-25 Published:2018-10-15
Contact: 曾和平,E-mail: dabatou@126.com
Supported by:
国家自然科学基金(41461061)

摘要/Abstract

摘要： 以牛粪为原料,在不同炭化温度下(200、300、400、500、600、700 ℃)采用热裂解法制备生物炭,借助扫描电子显微镜、元素分析仪、比表面积分析仪,结合Boehm滴定法、碘吸附及亚甲蓝吸附等,对所制得的牛粪生物炭的形貌特征、元素组成、比表面积、孔径、表面官能团和吸附性能等进行分析。结果表明:随着炭化温度升高,产率和挥发分含量降低,灰分和固定碳含量升高,pH值增加,制得生物炭的形貌特征更有规则且孔隙更加紧密。适当的升高炭化温度有利于孔隙的形成及微孔数量的增多,比表面积和孔容逐渐变大,而孔径逐渐减小。随炭化温度升高,牛粪生物炭的C含量增加,而H、O含量减小,N含量先增加后减小,H/C、(O+N)/C和O/C均下降,说明制得生物炭的芳香性和结构稳定性增强,但极性和亲水性减弱。表面官能团中羧基含量随炭化温度升高先增加后降低,羰基含量持续增加,而内酯基、酚羟基含量、酸总量和表面含氧官能团总量逐渐降低。碘吸附值和亚甲基蓝吸附值随炭化温度升高先增加后减小,在600 ℃下吸附值最大。

关键词: 废弃物, 资源化, 炭化温度, 牛粪生物炭

Abstract: A series of biochars were obtained under the limited oxygen cracking condition at different carbonization temperatures of 200, 300, 400, 500, 600, 700 ℃, respectively, with cow dung as raw material. The structures and properities of these biochars, i.e. surface morphology, element contents, specific surface area, pore size, surface functional groups and adsorption properties, were examined via scanning electronic microscopy, elemental analyzer, specific surface area and pore size distribution analyzer, and by means of Boehm titration, iodine adsorption and methylene blue adsorption. It was shown that the yields and volatile matter content decreased, while the contents of ash and fixed carbon and pH increased with the increasing carbonization temperature. Besides, the morphological features of biochars became more regular and the pores were denser. When the carbonization temperature was raised appropriately, it was beneficial to form pore and increase the number of micropores pore, the specific surface area and pore volume were increased, yet the pore size was decreased. With the increased carbonization temperature, the C contents of biochars increased, while the H and O contents decreased, and the N contents increased at first and then decreased, and the values of H/C,(O+H)/C and O/C were reduced, indicating that the aromatic properties and structural stability of biochars were enhanced, yet the polarity and hydrophilicity were both weakened. With the increasing carbonization temperatures, the carboxyl contents of surface functional groups were firstly increased and then decreased, the contents of carbonyl groups continuously increased, yet the contents of lactone and phenolic hydroxyl groups, the total contents of acid and oxygen-containing functional groups were gradually decreased. The adsorption value of iodine and methylene blue increased at first and then decreased with the increasing carbonization temperatures, andy both reached the highest value under 600 ℃.

Key words: waste, resourcezation, carbonization temperature, cow dung biochars

中图分类号:

S141.6
X713

黄惠群, 蔡文昌, 张健瑜, 李灿, 曾和平. 炭化温度对牛粪生物炭结构性质的影响[J]. 浙江农业学报, 2018, 30(9): 1561-1568.

HUANG Huiqun, CAI Wenchang, ZHANG Jianyu, LI Can, ZENG Heping. Effects of carbonization temperatures on structure and properties of cow dung biochars[J]. , 2018, 30(9): 1561-1568.

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炭化温度对牛粪生物炭结构性质的影响

Effects of carbonization temperatures on structure and properties of cow dung biochars

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