Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, United States.
Bioresour Technol. 2012 Apr;110:50-6. doi: 10.1016/j.biortech.2012.01.072. Epub 2012 Jan 25.
This study examined the ability of two biochars converted from anaerobically digested biomass to sorb heavy metals using a range of laboratory sorption and characterization experiments. Initial evaluation of DAWC (digested dairy waste biochar) and DWSBC (digested whole sugar beet biochar) showed that both biochars were effective in removing a mixture of four heavy metals (Pb(2 +), Cu(2+), Ni(2+), and Cd(2+)) from aqueous solutions. Compared to DAWC, DWSBC demonstrated a better ability to remove Ni and Cd. Further investigations of lead sorption by the two biochars indicated that the removal was mainly through a surface precipitation mechanism, which was confirmed by batch sorption experiments, mathematical modeling, and examinations of lead-laden biochars samples using SEM-EDS, XRD, and FTIR. The lead sorption capacity of the two biochars was close to or higher than 200mmol/kg, which is comparable to that of commercial activated carbons.
本研究通过一系列实验室吸附和特性实验，考察了两种由厌氧消化生物质转化而来的生物炭吸附重金属的能力。对 DAWC（消化乳废物生物炭）和 DWSBC（消化全甜菜生物炭）的初步评估表明，两种生物炭都能有效地从水溶液中去除四种重金属（Pb(2+)、Cu(2+)、Ni(2+)和 Cd(2+)）的混合物。与 DAWC 相比，DWSBC 表现出更好的去除 Ni 和 Cd 的能力。进一步研究两种生物炭对铅的吸附表明，去除主要是通过表面沉淀机制，这通过批量吸附实验、数学建模以及使用 SEM-EDS、XRD 和 FTIR 对负载铅的生物炭样品进行的检测得到了证实。两种生物炭的铅吸附容量接近或高于 200mmol/kg，与商业活性炭相当。
