Abstract
In this work porous biochar was prepared from bamboo powder by ZnCl2 chemical activation. The effects of preparation, modification and adsorption conditions on its removal performance of Cd2+ in simulated wastewater were investigated by static adsorption. The adsorption kinetics and isotherms of Cd2+ were further studied. The results showed that the good adsorption property was obtained over the biochar prepared under optimized preparation and modification conditions. The biochar reached the highest removal efficiency of 95.53% under optimum adsorption conditions. The adsorption process of Cd2+ was well in accordance with the pseudo-second adsorption kinetics equation, and the equilibrium adsorption capacity was up to 16.62 mg·g−1. The Freundlich isothermal adsorption model better fitted compared with the Langmuir model for this adsorption system and the maximum adsorption capacity was as high as 44.54mg·g−1. After four adsorption-desorption recycling, the adsorption removal percentage decreased a little, indicating that biochar had good regeneration performance. In short, this inexpensive porous biochar has the potential to become a practical adsorbent of cadmium.
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