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Ammonium retention by oxidized biochars produced at different pyrolysis temperatures and residence times
Bing Wang; Johannes Lehmann; Kelly Hanley; Rachel Hestrin; Akio Enders
2016
发表期刊RSC Advances
卷号6期号:48页码:41907-41913
摘要

In order to investigate the effects of pyrolysis conditions and oxidation on the retention potential of ammonium by biochar in aqueous solution, biochars were produced from mixed maple wood at different pyrolysis temperatures (300, 400, 500, 600, 700 degrees C) and residence times (5, 60, 120, 400, 800 min) and adsorption and desorption was determined. Hydrogen peroxide was used to oxidize the biochars with pH values ranging from 7.6 to 2.7, with one set being adjusted to a pH of 7 afterwards. Without oxidation, varying either pyrolysis temperatures or residence times did not have a relevant effect on ammonium adsorption. When oxidized, however, ammonium adsorption was up to 3.6 and 1.6 times greater at lower higher pyrolysis temperatures and shorter longer residence times, respectively. Neutralizing the oxygen-containing surface functional groups on oxidized biochar to pH 7 further increased ammonium adsorption three to four-fold for biochars originally at a temperature of 500 degrees C and residence time of 5 min, but did not change adsorption of biochars pyrolyzed at 600 degrees C and above and residence times at 400 min and above. Adjusting the pH of unoxidized biochars had no effect on ammonium adsorption. Both pyrolysis temperature and residence time significantly influence the way oxidation changes the charge properties with respect to ammonium adsorption by woody biochar.

学科领域环境地球化学
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/352002/6174
专题环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式
GB/T 7714
Bing Wang,Johannes Lehmann,Kelly Hanley,et al. Ammonium retention by oxidized biochars produced at different pyrolysis temperatures and residence times[J]. RSC Advances,2016,6(48):41907-41913.
APA Bing Wang,Johannes Lehmann,Kelly Hanley,Rachel Hestrin,&Akio Enders.(2016).Ammonium retention by oxidized biochars produced at different pyrolysis temperatures and residence times.RSC Advances,6(48),41907-41913.
MLA Bing Wang,et al."Ammonium retention by oxidized biochars produced at different pyrolysis temperatures and residence times".RSC Advances 6.48(2016):41907-41913.
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