Efficient adsorption removal of Cd2+ from aqueous solutions by HNO3 modified bamboo-derived biochar

IOP Conference Series: Materials Science and Engineering - Tập 729 Số 1 - Trang 012081 - 2020
Wenxiao Tang1, Ningning Cai1, Hongxia Xie1, Yachun Liu1, Zhifeng Wang2, Youhong Liao1, Taotao Wei1, Chao Zhang1, Zaihui Fu1, Dulin Yin1
1National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources, Key Laboratory of Resource Fine-Processing and advanced materials of Hunan Province and Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan, 410081, China
2Hunan Kangshou Pharmaceutical Co., Ltd., Changsha, Hunan, 410200, China

Tóm tắt

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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IOP Conference Series: Materials Science and Engineering

Tập 729 Số 1

012081

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