(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 以柑橘皮(OP)為原料，通過MgCl2進(jìn)行改性制備新型柑橘皮生物吸附劑MgOP。考察溶液pH值、溫度、固液比、吸附時間和金屬離子濃度對MgOP從單組分溶液中吸附Cu2+、Cd2+、Pb2+、Zn2+和Ni2+的吸附性能的影響。結(jié)果表明，pH值和固液比對吸附率的影響較明顯；溫度對吸附率的影響較小；所有吸附過程可在20 min內(nèi)達(dá)到吸附平衡，對5種金屬離子的吸附動力學(xué)均符合準(zhǔn)二級動力學(xué)方程；與原始柑橘皮相比，MgOP對5種金屬離子的最大吸附量顯著提高；MgOP可重復(fù)使用10次以上；共存金屬離子對吸附率影響很小。
關(guān)鍵字: 改性柑橘皮；吸附；重金屬離子；吸附劑
aqueous solutions by MgCl2 modified orange peel
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Orange peel (OP) was modified by MgCl2 to prepare a novel orange peel adsorbent named as MgOP. The effects of pH, temperature, solid/liquid ratio, adsorption time and metal ion concentration on the removal behavior of individual heavy metals such as Cu2+, Cd2+, Pb2+, Zn2+ and Ni2+ from aqueous solution with single component by MgOP were investigated. The results show that pH and solid/liquid ratio have positive effects on the adsorption efficiency; temperature has little impact on the adsorption efficiency. All adsorption processes can attain equilibrium within 20 min, and the kinetics data of five kinds of metal ions are fitted to pseudo-second-equation. The MgOP can increase the maximum adsorption capacities of Cu2+, Cd2+, Pb2+, Zn2+ and Ni2+, compared with those of OP. The MgOP can be used for more than 10 cycles. The effect of coexisting metal ions on adsorption can be neglected.
Key words: modified orange peel; adsorption; heavy metal ions; adsorbent
