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Position: Home > Articles > Structural feature and chromium(Ⅵ)adsorption of biochar derived from Pennisetum hydridum Journal of Agro-Environment Science 2016,35 (06) 1188-1193

皇竹草生物炭的结构特征及其对Cr(Ⅵ)的吸附性能

作  者:
赖长鸿;颜增光;廖博文;李松蔚;贺鸿志;黎华寿;陈桂葵
单  位:
中国环境科学研究院环境基准与风险评估国家重点实验室;华南农业大学农业部华南热带农业环境重点实验室;广东省现代生态农业与循环农业工程技术研究中心
关键词:
生物炭;皇竹草;热解温度;Cr(Ⅵ);吸附特性;电镜扫描(SEM)
摘  要:
以皇竹草茎秆为原料,在限氧控温(300、500、700℃)条件下制备生物炭,研究该生物炭的结构特征及其对Cr(Ⅵ)的吸附行为。结果发现,随着热解温度的升高,皇竹草生物炭的产率下降,而灰分、p H呈上升趋势;电镜扫描(SEM)观察可见不同热解温度下所制备的生物炭结构相似,均具多孔和管状结构,但在700℃条件下所制备的生物炭相对300℃下制备的生物炭孔壁变薄,且孔壁有附着物,切面有突起结构。三种温度下制备的皇竹草生物炭对溶液中的Cr(Ⅵ)都具有较好的吸附作用,且500、700℃下制备的生物炭比300℃下制备的生物炭具有更好的吸附效果。在0~1 h之间,三种热解温度下制备的生物炭对铬的吸附量均随着时间的延长而快速增加,当吸附至1 h时,基本达到饱和状态,随后吸附量无明显变化。
译  名:
Structural feature and chromium(Ⅵ)adsorption of biochar derived from Pennisetum hydridum
作  者:
LAI Chang-hong;YAN Zeng-guang;LIAO Bo-wen;LI Song-wei;HE Hong-zhi;LI Hua-shou;CHEN Gui-kui;Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R.China, South China Agricultural University;State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences;Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture;
关键词:
biochar;;Pennisetum hydridum;;pyrolysis temperature;;chromium(Ⅵ);;adsorption performance;;scanning electron microscopy
摘  要:
This research investigated the structural feature of biochar derived from Pennisetum hydridum under hypoxia conditions at three pyrolysis temperatures(300 ℃, 500 ℃, and 700 ℃)and its chromium(Ⅵ)adsorption. Results showed that increasing pyrolysis temperature decreased the biochar production rates, but increased ash content and p H values. Scanning electron microscopy showed that the hole wall of the biochar prepared at 700 ℃ was thinner, with more attachments and protuberances inside than that at 300 ℃. All three biochars had good adsorption of Cr(VI), with adsorption capacity being higher at 500 ℃ and 700 ℃ than at 300 ℃. The adsorption of Cr(VI)by biochars increased quickly and reached saturation after 1 h, and remained no obvious changes after that.

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