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Evaluation of biochar properties exposing to solar radiation: A promotion on surface activities

文献类型： 外文期刊

作者： Li, Neng 1 ; Rao, Fei 1 ; He, Lili 2 ; Yang, Shengmao 2 ; Bao, Yongjie 1 ; Huang, Chengjian 1 ; Bao, Minzhen 1 ; Chen, Yu 1 ;

作者机构： 1.China Natl Bamboo Res Ctr, Hangzhou 310012, Zhejiang, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, 198 Shiqiao Rd, Hangzhou 310021, Zhejiang, Peoples R China

3.Chinese Acad Forestry, Res Inst Wood Ind, Beijing 10000, Peoples R China

4.Key Lab High Efficient Proc Bamboo Zhejiang Prov, Hangzhou 310012, Zhejiang, Peoples R China

关键词： Pyrolytic carbon; Oxidation; Photodegradation

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.273； 五年影响因子：11.529 ）

ISSN： 1385-8947

年卷期： 2020 年 384 卷

页码：

收录情况： SCI

摘要： Biochar is an important bio-material used to mitigate environmental and agronomic problems. The complex outdoor environment, which includes exposure to solar radiation, greatly influences biochar structure, which in turn impacts its functions when it is used in outdoors. The objective of this study is to understand the dynamics associated with the physical and chemical changes that occur in bamboo biochar (BB) prepared at different final temperatures during exposure to damaging radiation. The basic physical and chemical properties of fresh and accelerated weathered BBs were investigated by measuring the chemical element, ash content, BET surface area, color changes. Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetry analysis and differential scanning calorimetry were used to determine the changes in functional groups, the variation in the surface element species distribution and the differences in thermochemical property of BBs. The experimental results showed that clear changes in BBs were obtained after 400 h of accelerated weathering. The C and N contents of BBs declined, and its O content increased. The average changes in color and decrease in residue yield of BBs were 1.02 and 1.58%, respectively. The average growth rates of O/C ratio (determined by elemental analysis), C4, and O2 of BBs were 17.04%, 13.88% and 86.63%, respectively. These results illustrate that the BBs underwent a series of photooxidation reactions when exposed to UV radiation. The increase of surface oxygen-containing functional groups may improve the surface activities of BB with respect to soilamelioration applications, pollutant-degradation efficiency and the adsorbability toward aqueous contaminants.

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