Department of Food Science and Technology, South China University of Technology, Wushan Road, Guangzhou, Guangdong Province, China, 510641.
Environ Technol. 2011 May-Jun;32(7-8):739-46. doi: 10.1080/09593330.2010.510853.
Research on chemical modification of pineapple peel fibre with succinic anhydride was carried out to create a novel adsorbent for Cu2+, Cd2+ and Pb2+ removal from aqueous solution. After pretreatment with iso-propyl alcohol and NaOH, pineapple peel fibre was modified via reaction with succinic anhydride for introduction of carboxylic functional groups. The modified pineapple peel fibre was characterized with Fourier transform infrared (FTIR) spectroscopy and evaluated for its adsorptive ability for Cu2+, Cd2+ and Pb2+ from synthetic metal solutions. The FTIR analysis proved the introduction of carboxylic functional groups in the backbone of the modified pineapple peel fibre. The modified pineapple peel fibre showed higher adsorptive capacity for Cu2+, Cd2+ and Pb2+ compared with raw pineapple peel and pineapple peel fibre pretreated with iso-propyl alcohol. The adsorption of Cu2+, Cd2+ and Pb2+ on the modified pineapple peel fibre depended on solution pH value, adsorption time and initial metal concentration. The maximum adsorption capacities of the modified fibre were observed at pH 5.4 for Cu2+ (27.68 +/- 0.83 mg g(-1) or 0.44 mmol g(-1)), at pH 7.5 for Cd2+ (34.18 +/- 1.02 mg g(-1) or 0.30 mmol g(-1)) and at pH 5.6 for Pb2+ (70.29 +/- 2.11 mg g(-1) or 0.34 mmol g(-1)) respectively. The adsorption followed the pseudo-second-order kinetics model and the experimental data coincided well with the Langmuir model.
菠萝皮纤维与琥珀酸酐的化学修饰研究旨在创造一种新型吸附剂，用于从水溶液中去除 Cu2+、Cd2+ 和 Pb2+。菠萝皮纤维经过异丙醇和 NaOH 预处理后，与琥珀酸酐反应引入羧酸官能团进行修饰。用傅里叶变换红外（FTIR）光谱对改性菠萝皮纤维进行了表征，并评价了其对合成金属溶液中 Cu2+、Cd2+ 和 Pb2+的吸附能力。FTIR 分析证明了改性菠萝皮纤维骨架中引入了羧酸官能团。与原菠萝皮和用异丙醇预处理的菠萝皮纤维相比，改性菠萝皮纤维对 Cu2+、Cd2+ 和 Pb2+具有更高的吸附能力。Cu2+、Cd2+ 和 Pb2+在改性菠萝皮纤维上的吸附取决于溶液 pH 值、吸附时间和初始金属浓度。改性纤维对 Cu2+的最大吸附容量出现在 pH 5.4（27.68 +/- 0.83 mg g(-1) 或 0.44 mmol g(-1)），对 Cd2+的最大吸附容量出现在 pH 7.5（34.18 +/- 1.02 mg g(-1) 或 0.30 mmol g(-1)），对 Pb2+的最大吸附容量出现在 pH 5.6（70.29 +/- 2.11 mg g(-1) 或 0.34 mmol g(-1)）。吸附遵循准二级动力学模型，实验数据与 Langmuir 模型吻合较好。
