|导师||王传义 ; 袁群惠|
|关键词||橘子皮 氨基化改性 hg2+离子 吸附剂|
In this paper, three biosorbents were prepared using orange peel (OP) from agriculture residues by chemical modification, including diethylenetriamine modified OP to obtain the adsorbents (DOP), firstly grafting OP with acrylonitrile follow by reacting with diethylenetriamine to obtain a novel aminated orange peel (AOP), while amino-functionalized carbonaceous materials (OP-HC-N) made by hydrothermal carbonization from OP. The adsorption performance of Hg2+ ions on these bisorbents in aqueous solution was studied. The active sites and surfaces morphology of orange peel and modified orange peel were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, BET-N2 adsorption and elemental analysis technique. The results show obvious C-N bond stretching peak in the infrared spectra of DOP, AOP and OP-HC-N appeared. The SEM characterization elucidates that DOP surface distinctly appeares as cellulose grain, and AOP surface is more rough, potholed and vesicular than the raw OP. PP-HC-N prepared by hydrothermal carbonization of OP is somewhat uneven carbon sphere, which was entirely different from OP; The amount of nitrogen contained in DOP, AOP and OP-HC-N were 6.77%, 21.77% and 9.09%, which increased by 510%，1861% and 719% times than that of raw OP, respectively. Removal efficiencies of these adsorbents were tested as a function of adsorbents dosage, initial pH, contact time, temperature, initial metal concentrations, ionic strength and coexistence of heavy metal ions by bath adsorption, and the adsorption thermodynamics and the adsorption kinetics were studied systematically. The mechanisms of adsorption Hg2+ by the amino-functionalized OP was investigated by BET-N2 adsorption-desorption, infrared spectroscopy and scanning electron microscopy. The experiment results indicate that the optimal pH for Hg2+ removal is 3.0, 4.0 and 4.0 for DOP, AOP and OP-HC-N, respectively. The adsorption efficiencies increase with the increasing adsorbents dosage. For DOP and OP-HC-N, the removal of Hg2+ reaches optimum result as the dosage is 1g/L, but for AOP, only 0.4g/L of dosage can achieve satisfactory effect.
|刘明灯. 氨基改性橘子皮对水中汞离子的吸附性能及机制研究[D]. 北京. 中国科学院大学,2013.|
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