Science Target Conference Systems, Ajman 4th International Environment Conference 2016

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The role of nanoporous biochars from pulp and paper residues for immobilization of heavy metals
Ahmad Khodadadi Darban

Last modified: 2015-12-20

Abstract


The aim of current research has been synthesis and characterization of biochars out of different pulp and paper industry residues (barks and sludge) used as feedstock biomass. The biomasses were initially analysed for their thermogravimetric behavior. Accordingly, the proper pyrolysis condition has been selected. Changes in surface functional groups have been studied by FTIR spectroscopy. Elemental analysis and acid digestion has been applied to measure C, H, N, S, O, and P content of the biochars. Porosity and morphological characteristics have been monitored by BET and SEM which unveiled the nanoporosity of the chars and the distribution pattern of sorbed metals over the char samples. In order to assess the affinity of the chars to immobilize Cu, Zn, and Pb from aqueous and soil environments, batch experiments have been designed and performed. The results indicated remarkable sorption capacity in case of each char. Finally, a set of soil sequential extraction was performed on amended/unamended soil to more accurately explain the sorption mechanism beside a post-sorption FTIR analysis over the biochars. The results suggest the possible competitive immobilization mechanism as Cu being mainly organically bounded to amino, hydroxyl and carboxyl functional groups, Pb forming insoluble hydroxide, phosphate or carbonate, and Zn being mostly sorbed in the residual fraction of the soil.