Abstract
Two kinds of macroalgae biochars were prepared through pyrolysis of typical macroalgae (enteromorpha and sargassum), and were used to adsorb gaseous hydrogen sulfide (H2S) from biogas for the first time. Effects of several key technological parameters on H2S adsorption over two typical macroalgae (enteromorpha and sargassum) biochars were evaluated. The physical and chemical properties of two kinds of macroalgae biochars were analyzed using several characterization tools. The adsorption kinetics of H2S on two kinds of macroalgae biochars were also studied. The results show that the optimal calcination temperatures for two kinds of macroalgae biochars are 800 °C. The adsorption of H2S is reduced via raising temperature, gas flow rate or inlet concentration of H2S. An increase in moisture concentration enhances at first, and then reduces H2S adsorption. Some key oxidative and alkaline functional groups that were beneficial to H2S removal were found. The kinetic model with pseudo-first-order can describe the adsorbing process of H2S on two kinds of macroalgae biochars well. Thermodynamic analysis exhibits that the physical adsorption plays a dominant role in the H2S adsorption process.
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