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Adsorption and desorption of ammonium by maple wood biochar as a function of oxidation and pH
Bing Wang; Johannes Lehmann; Kelly Hanley; Rachel Hestrin; Akio Enders
2015
Source PublicationChemosphere
Volume138Issue:1Pages:120-126
Abstract

The objective of this work was to investigate the retention mechanisms of ammonium in aqueous solution by using progressively oxidized maple wood biochar at different pH values. Hydrogen peroxide was used to oxidize the biochar to pH values ranging from 8.1 to 3.7, with one set being adjusted to a pH of 7 afterwards. Oxidizing the biochars at their lowered pH did not increase their ability to adsorb ammonium. However, neutralizing the oxygen-containing surface functional groups on oxidized biochar to pH 7 increased ammonia adsorption two to three-fold for biochars originally at pH 3.7-6, but did not change adsorption of biochars oxidized to pH 7 and above. The adsorption characteristics of ammonium are well described by the Freundlich equation. Adsorption was not fully reversible in water, and less than 27% ammonium was desorbed in water in two consecutive steps than previously adsorbed, for biochars with a pH below 7, irrespective of oxidation. Recovery using an extraction with 2 M KCl increased from 34% to 99% of ammonium undesorbed by both preceding water extractions with increasing oxidation, largely irrespective of pH adjustment. Unrecovered ammonium in all extractions and residual biochar was negligible at high oxidation, but increased to 39% of initially adsorbed amounts at high pH, likely due to low amounts adsorbed and possible ammonia volatilization losses.

KeywordBiochar Ammonium Adsorption Oxidation Black Carbon
Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/5781
Collection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
Recommended Citation
GB/T 7714
Bing Wang,Johannes Lehmann,Kelly Hanley,et al. Adsorption and desorption of ammonium by maple wood biochar as a function of oxidation and pH[J]. Chemosphere,2015,138(1):120-126.
APA Bing Wang,Johannes Lehmann,Kelly Hanley,Rachel Hestrin,&Akio Enders.(2015).Adsorption and desorption of ammonium by maple wood biochar as a function of oxidation and pH.Chemosphere,138(1),120-126.
MLA Bing Wang,et al."Adsorption and desorption of ammonium by maple wood biochar as a function of oxidation and pH".Chemosphere 138.1(2015):120-126.
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