Department of Food Science and Technology, South China University of Technology, Guangzhou, PR China.
Water Environ Res. 2010 Aug;82(8):733-41. doi: 10.2175/106143009x12529484816150.
Reactions between saponified pineapple peel fiber (SPPF) and succinic anhydride were performed in refluxed pyridine and dimethyl sulfoxide to obtain modified pineapple peel fiber in pyridine (MPPF-PY) and modified pineapple peel fiber in dimethyl sulfoxide at room temperature (MPPF-DMRT) and at 70 degrees C (MPPF-DM70) as novel metal ionic adsorbents. The modified pineapple peel fibers were characterized by Fourier transform infrared (FTIR) and X-ray diffraction (XRD). The MPPF-PY, MPPF-DMRT, and MPPF-DM70 showed higher Cu2+, Cd2+, and Pb2+ adsorption capacity than raw pineapple peel fiber (RPPF) and SPPF. Dimethyl sulfoxide favored introduction of a carboxylic function group into pineapple peel fiber compared with pyridine. The elevated reaction temperature of dimethyl sulfoxide could increase the adsorption capacity of the modified pineapple fiber. Optimum pH values for Cu2+, Cd2+, and Pb2+ removal by MPPF-DM70 were pH 5.5, 7.5, and 5.5, respectively. The Cu2+, Cd2+, and Pb2+ adsorptions by MPPF-DM70 followed the pseudo second-order kinetics model and Langmuir model.
菠萝皮纤维（SPPF）经皂化后与丁二酸酐在回流吡啶和二甲基亚砜中反应，可在吡啶（MPPF-PY）和室温下的二甲基亚砜（MPPF-DMRT）以及 70°C 下（MPPF-DM70）得到新型金属离子吸附剂改性菠萝皮纤维。改性菠萝皮纤维采用傅里叶变换红外（FTIR）和 X 射线衍射（XRD）进行了表征。MPPF-PY、MPPF-DMRT 和 MPPF-DM70 对 Cu2+、Cd2+和 Pb2+的吸附能力均高于原菠萝皮纤维（RPPF）和 SPPF。与吡啶相比，二甲基亚砜更有利于将羧基官能团引入菠萝皮纤维。二甲基亚砜升高的反应温度可提高改性菠萝纤维的吸附能力。MPPF-DM70 对 Cu2+、Cd2+和 Pb2+的最佳去除 pH 值分别为 5.5、7.5 和 5.5。MPPF-DM70 对 Cu2+、Cd2+和 Pb2+的吸附均符合拟二级动力学模型和 Langmuir 模型。
