水稻秸秆生物炭对异丙甲草胺的吸附和缓释作用

doi:10.11934/j.issn.1673-4831.2016.01.026

生态与农村环境学报 ›› 2016, Vol. 32 ›› Issue (1): 168-172.doi: 10.11934/j.issn.1673-4831.2016.01.026

• 研究简报 • 上一篇

水稻秸秆生物炭对异丙甲草胺的吸附和缓释作用

葛超超, 郭璇, 李建法, 吕金红, 刘森, 徐海霞

绍兴文理学院化学系, 浙江绍兴 312000

收稿日期:2015-02-08 出版日期:2016-01-25 发布日期:2016-01-27
通讯作者: 李建法,通信作者E-mail:ljf@usx.edu.cn E-mail:ljf@usx.edu.cn
作者简介:葛超超(1992-),女,浙江绍兴人,本科生,主要研究方向为生物炭在污染控制中的作用。E-mail:1964354561@qq.com
基金资助:
国家自然科学基金(41271475);浙江省绍兴市公益性技术应用研究计划(2012B70084)

Effects of Rice-Straw-Derived Biochar on Adsorbing and Slow-Releasing of Metolachlor

GE Chao-chao, GUO Xuan, LI Jian-fa, LÜ Jin-hong, LIU Sen, XU Hai-xia

Department of Chemistry, Shaoxing College of Arts and Science, Shaoxing 312000, China

Received:2015-02-08 Online:2016-01-25 Published:2016-01-27

摘要/Abstract

摘要：

以控制除草剂污染为目标,对水稻秸秆进行低温(200和350℃)限氧热解制备生物炭,考察其对异丙甲草胺的吸附和缓释作用。结果表明,热解温度为350℃时制备的生物炭(D350)比表面积为23.2 m²·g^-1,对异丙甲草胺的吸附能力明显高于秸秆原料,与200℃时制备的生物炭(D200)接近。但是,D350生物炭对异丙甲草胺的表面吸附作用更强,且脱附滞后指数(5.35)明显高于D200生物炭(2.07),脱附滞后效应更明显。以生物炭为载体制备的颗粒制剂可延缓除草剂释放,水中释放动力学模型参数n_r值接近Fickian扩散模型的0.50,且释放50%活性成分所需时间(t₅₀)与脱附滞后指数呈正相关。

关键词: 生物质, 吸附, 除草剂, 缓释

Abstract:

Aiming at controlling herbicide pollution of the environment, biochars were prepared out of rice straw through oxygen-limited pyrolysis at low temperatures(200 and 350℃), and their effects of adsorbing and slow-releasing herbicide metolachlor were investigated. Results show that the biochar prepared at temperature of 350℃(D350) was 23.2 m²·g^-1 in specific surface area and hence much higher than rice straw in metolachlor sorption capacity, and close to the biochar prepared at temperature of 200℃(D200). But, biochar D350 showed a higher surface adsorption capacity to metolachlor and a higher desorption hysteresis index(5.35) than D200 did(2.07), indicating that granular preparation of biochar can be used as sustained releaser of metolachlor, with parameter n_r of its in-water release kinetic model being close to that(0.50) of the Fickian diffusion model, and the time it took to release 50% of adsorbed metolachlor(t₅₀) is positively related to the desorption hysteresis index.

Key words: biomass, sorption, herbicide, sustained release

中图分类号:

葛超超, 郭璇, 李建法, 吕金红, 刘森, 徐海霞. 水稻秸秆生物炭对异丙甲草胺的吸附和缓释作用[J]. 生态与农村环境学报, 2016, 32(1): 168-172.

GE Chao-chao, GUO Xuan, LI Jian-fa, LÜ Jin-hong, LIU Sen, XU Hai-xia. Effects of Rice-Straw-Derived Biochar on Adsorbing and Slow-Releasing of Metolachlor[J]. Journal of Ecology and Rural Environment, 2016, 32(1): 168-172.

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水稻秸秆生物炭对异丙甲草胺的吸附和缓释作用

Effects of Rice-Straw-Derived Biochar on Adsorbing and Slow-Releasing of Metolachlor

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