橘子皮皂化改性及其对重金属离子的吸附  

Saponification of orange peel and its adsorption behavior for heavy metal ions

作　　者：冯宁川[1,2] 郭学益[1] 梁莎[1] 田庆华[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083 [2]宁夏医科大学基础医学院,银川750004

出　　处：《环境工程学报》2011年第1期11-15,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(50774100)

摘　　要：以农林废弃物橘子皮（OP）为原料,经氢氧化钠皂化处理,得到了改性橘子皮生物吸附剂（MOP）,并将其用于对水溶液中重金属离子的吸附。研究了氢氧化钠溶液浓度、浸泡时间对改性产物产率和吸附性能的影响;通过扫描电镜、红外光谱分析,化学耗氧量、比表面积、Zeta电位的测定等方法研究了橘子皮皂化改性的机理。结果表明,橘子皮用0.2mol/L NaOH溶液改性16~20 h后,产物的产率较高且对重金属离子的吸附能力较强;经NaOH溶液改性后,橘子皮中活性官能团羧基数目增加,比表面积和孔隙率的增大,吸附能力提高。In this study,a biosorbent,the modified orange peel（MOP）,was prepared by treating chemically orange peel（OP） with ethanol and sodium hydroxide and was used to adsorb heavy metal ions from aqueous solution.The effects of concentration of sodium hydroxide solution and immersion time on the yield and adsorption percentage of the MOP were studied.The changes of physical structure and chemical properties of the MOP were characterized by using a variety of analytical instruments and methods,such as BET-N2 adsorption,infrared spectroscopy and scanning electron microscopy techniques.The results showed that the OP treated with 0.2 mol/L NaOH solution for 16~20 h exhibited the higher yield and adsorption capacity for heavy metal ions.The MOP became rough porous in structural morphology and had more negative charge than raw OP,which facilitated the electrostatic interaction with cations.For FT-IR spectrum,results indicated that the methyl esters were hydrolyzed with NaOH and ester groups were converted to carboxylate ions,which improved the number of active functional groups with adsorption capacity.

关 键 词：橘子皮 皂化 吸附 重金属离子 

分 类 号：X712[环境科学与工程—环境工程]