Institute of Applied Research (Affiliated with University of Haifa), The Galilee Society, P.O. Box 437, Shefa-Amr 20200, Israel; Faculty of Civil and Environmental Engineering, Technion Institute, Haifa 32000, Israel.
Faculty of Civil and Environmental Engineering, Technion Institute, Haifa 32000, Israel.
Bioresour Technol. 2017 Nov;244(Pt 1):759-767. doi: 10.1016/j.biortech.2017.08.013. Epub 2017 Aug 7.
Commercial activated carbon (CAC) and biochar are useful adsorbents for removing heavy metals (HM) from water, but their production is costly. Biochar production from olive solid waste from two olive cultivars (Picual and Souri) and two oil production process (two- or three-phase) and two temperatures (350 and 450°C) was tested. The biochar yield was 24-35% of the biomass, with a surface area of 1.65-8.12mg, as compared to 1100mg for CAC. Picual residue from the two-phase milling technique, pyrolysed at 350°C, had the best cumulative removal capacity for Cu, Pb, Cd, Ni and Zn with more than 85% compared to other biochar types and CAC. These results suggest that surface area cannot be used as a sole predictor of HM removal capacity. FTIR analysis revealed the presence of different functional groups in the different biochar types, which may be related to the differences in absorbing capacities.
商用活性炭 (CAC) 和生物炭是从水中去除重金属 (HM) 的有用吸附剂，但它们的生产成本很高。本研究测试了从两种橄榄品种（Picual 和 Souri）和两种油生产工艺（两相或三相）以及两种温度（350 和 450°C）的橄榄固体废弃物中生产生物炭。与 CAC 的 1100mg 相比，生物炭的产率为生物质的 24-35%，比表面积为 1.65-8.12mg。采用两相碾磨技术的 Picual 残渣在 350°C 下热解，对 Cu、Pb、Cd、Ni 和 Zn 的累积去除能力最好，与其他生物炭类型和 CAC 相比，超过 85%。这些结果表明，比表面积不能作为 HM 去除能力的唯一预测因子。FTIR 分析表明，不同生物炭类型中存在不同的官能团，这可能与吸附能力的差异有关。
