Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 47, Issue 15, Pages 8700-8708Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es4012977
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Funding
- NSF [CBET-1054405, CHE-1213333]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1054405] Funding Source: National Science Foundation
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This work explored the potential application of an engineered biochar prepared from Mg-enriched tomato tissues to reclaim and reuse phosphate (P) from aqueous solution. Findings from batch sorption experiments suggested that, although sorption of P on the biochar was controlled by relatively slow kinetics, the maximum P sorption capacity of the biochar could reach >100 mg.g(-1). Mathematical modeling and postsorption characterization results indicated that the sorption was mainly controlled by two mechanisms: precipitation of P through chemical reaction with Mg particles and surface deposition of P on Mg crystals on biochar surfaces. Most of the P retained in the engineered biochar was bioavailable and could be released equally at multiple successive extractions. In addition, the P-laden biochar significantly stimulated grass seed germination and growth. These results suggested the postsorption biochar can be cycled back directly to soils as an effective slow-release P-fertilizer.
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