PDF《裂解温度及高锰酸钾活化对棉花秸秆生物炭性状的影响》

收稿日期: 2018-02-26 基金项目: 国家自然科学基金项目(31400456)和江苏省自然科学基金项目(BK20130967)共同资助.

作者简介: 刘国华,博士,副研究员.E-mail:[email protected] * 通信作者: 王福升,副研究员.E-mail:[email protected] 安徽农业大学学报, 2018, 45(5): 916-920 Journal of Anhui Agricultural University [DOI] 10.13610/j.cnki.1672-352x.20181023.001 网络出版时间:2018/10/24 14:14:00 [URL] http://kns.cnki.net/kcms/detail/34.1162.S.20181023.1611.002.html 裂解温度及高锰酸钾活化对棉花秸秆生物炭性状的影响 刘国华,方正,苏小飞,王福升 * (南京林业大学竹类研究所,南京林业大学南方现代林业协同创新中心,南京 210037) 摘要:采用不同浓度的高锰酸钾溶液浸渍棉花秸秆在不同裂解温度下制备棉花生物炭,研究了高锰酸钾浓度 及裂解温度对棉花生物炭性状的影响.结果表明,不同制备条件下获得的棉花生物炭的产率位于 22.22%~47.17% 之间, 随着裂解温度的升高而降低, 而不同生物炭灰分含量 (9.99%~28.83%) 、 pH (9.7~12.1) 及比表面积 (2.34~ 167.58 m2 ・g-1 )随着裂解温度的提高逐渐升高.棉花生物炭中元素以 C 和O元素为主.高锰酸钾处理会显著提高棉 花生物炭 pH 及比表面积,并使炭表面官能团种类更为丰富. 关键词:高锰酸钾;

棉花秸秆;

生物炭;

性状 中图分类号:S562;

X712 文献标识码:A 文章编号:1672?352X (2018)05?0916?05 Effect of pyrolysis temperature and potassium permanganate activation on the characteristics of biochar from cotton culms LIU Guohua, FANG Zheng, SU Xiaofei, WANG Fusheng (Bamboo Research Institute, Nanjing Forestry University, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037) Abstract: The cotton culms which immersed in different concentrations of potassium permanganate were used for the preparation of biochar under different pyrolysis temperature. The physical and chemical characteristics of different cotton biochar were analyzed. The results showed that the yield of different cotton biochar was decreased with the increment of pyrolysis temperature, and all yields were changed from 22.22% to 47.17%. However, the ash content (9.99%-28.83%), pH (9.7-12.1) and specific surface area (2.34-167.58 m2 ・g-1 ) increased with the increment of pyrolysis temperature. The major elements of cotton biochar were C and O. The treatment of potassium perman- ganate increased the pH and specific surface area of biochar significantly, and made the types of surface functional groups of biochar be richer. Therefore, the utilization of potassium permanganate as an activating agent could be ex- pected as a low-cost, efficient and green approach for manufacture of higher functional biochar. Key words: potassium permanganate;

cotton culm;

biochar;

characteristic 棉花是重要经济作物,在我国经济发展中占重 要地位[1] .截止到

2016 年,我国棉花种植面积

338 万hm2 ,产量

534 万t,每年棉花秸秆产量可达 4.35 *

107 t,棉花秸秆多元化利用一直是研究热点[2-3] . 近年来,棉花秸秆主要用于气化制取可燃气、还田、 饲料和造纸等,因为棉花秸秆粗纤维和木质素含量 较高,质地坚硬等特点[4] ,导致棉花秸秆商业化利用 竞争优势小、处理成本高和商业价值低,很难大规 模应用,大量棉花秸秆被焚毁或堆弃闲置[5] . 生物炭是由秸秆等原材料在限氧或无氧条件下 经低温或相对低温 (