Effect of Biochar bead on Adsorption of Heavy Metals

초록

In recent years, biochar has received much attention as soil amendment, enhancing soil fertility and reducingtoxicity of heavy metals with its large specific surface area and high pH. Biochar has also the effect ofalleviating global warming by carbon sequestration from recycling organic wastes by pyrolysis. However,scattering of fine particles of biochar is a hindrance to expand its use from human health point-of-view. Alginate, a natural polymer without toxicity, has been used for capsulation and hydrogel fabrication due to itscross-linking nature with calcium ion. In this study, the method of cross-linkage between alginate and calciumion was employed for making dust-free biochar bead. Then an equilibrium adsorption experiment wasperformed for verifying the adsorption effect of biochar bead on heavy metals (cadmium, copper, lead,arsenic, and zinc). Results showed that biochar bead had effects on adsorbing heavy metals, especially lead,except arsenic.

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