竹木质纤维素吸附水溶液中铅离子的研究

Adsorption of Pb(Ⅱ)from Aqueous Solution on Bamboo Lignocellulose

采用盐酸对竹木质纤维素进行改性,研究其吸附水溶液中铅离子的性能。采用傅立叶红外（FT-IR）对其结构进行了表征。研究了溶液pH、吸附时间、吸附剂用量、溶液浓度等对吸附容量的影响。实验结果表明,4 h后达到吸附平衡,在Pb（II）溶液浓度在100 mg/L时,pH在4.5-5.5范围内时达到最大吸附量,盐酸改性的竹木质纤维素吸附性能较高,表明HCl改性后的竹木质纤维素吸附性能得到提高。利用竹木质纤维素来吸附重金属离子,具有绿色环保,无污染点成本低廉等优点,具有良好的应用前景。

A bioadsorbent for the remove of Pb（Ⅱ） from aqueous solution was prepared from the bamboo modified with hydrochloric acid. The modified bamboo before and after adsorption were characterized by Fourier transform infrared spectroscopy（FT-IR）. Batch adsorption exeriments were carried out to remove lead ions from the aqueous solutions using the bioadsorbent. The effect of pH, adsorption time, dosage of bioadsorbent and initial concentration of Pb（Ⅱ） on the adsorption capacity of Pb2＋were investigated. Results showed that the adsorption equilibrium was attained after 4 hours of contact. Results showed that the maximum of removal efficiency was achieved in the pH range 4.5-5.5 and with initial P b（Ⅱ） concentration of 100 mg/L. All results showed that modified bamboo was an attractive, alternative low-cost biosorbent for removal of Pb（II） from aqueous solution.