Biochar produced from oak sawdust by Lanthanum (La)-involved pyrolysis for adsorption of ammonium (NH4+), nitrate (NO3), and phosphate (PO43)
摘要：
A series of biochars were prepared by pyrolyzing oak sawdust with/without LaCl3 involvement at temperature of 300–600°C, and approximate and ultimate analyses were carried out to check their basic characteristics. Meanwhile, the releases of readily soluble NH4+, NO3 and PO43 from biochars and the adsorption of NH4+, NO3 and PO43 by biochars were investigated. Results indicated that the involvement of LaCl3 in pyrolysis could advance the temperature of maximum mass loss by 10°C compared with oak sawdust (CK), and potentially promoted biochar yield. Overall, the releases of readily soluble NH4+, NO3 and PO43 from biochars were negatively related to pyrolysis temperature, and the releases were greatly weakened by La-biochars. Additionally, the adsorption to NH4+ can be promoted by the biochars produced at low temperature. On the contrary, the NO3 adsorption can be improved by increasing pyrolysis temperature. The highest PO43 adsorption was achieved by the biochars produced at 500°C. According to the results of adsorption isotherms, the maximum adsorption capacity of NH4+, NO3 and PO43 can be significantly promoted by 1.9, 11.2, and 4.5 folds using La-biochars. Based on the observations of FT-IR, SEM–EDS, and surface functional groups, the improvement of NH4+ adsorption was potentially associated with the existing acidic function groups (phenolic-OH and carboxyl CO). The increased basic functional groups on La-biochars were beneficial to improve NO3 and PO43 adsorption. Besides, PO43 adsorption was also potentially related to the formed La2O3.
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DOI：
10.1016/j.chemosphere.2014.07.084
被引量：
年份：
2015
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