摘要
研究了橙皮对Pb^2+的吸附,分别采用H3PO4、NaOH、无水乙醇-NaOH、CaCl2-无水乙醇-NaOH等溶液对橙皮进行改性。探讨了吸附时间、吸附剂用量、吸附温度和溶液酸度对Pb^2+吸附效果的影响。并采用扫描电镜和红外光谱对改性橙皮形貌及其吸附Pb^2+前后进行表征。结果表明:四种改性橙皮中,以CaCl2-无水乙醇-NaOH为改性剂制备的改性橙皮对Pb^2+吸附效果最好;吸附时间120min时,改性橙皮吸附剂对Pb^2+的吸附已达到饱和,最佳吸附温度为40℃,最佳吸附溶液酸度为pH=5.0;当Pb^2+初始浓度为200mg/L时,吸附剂最佳投入量为0.15g,此时吸附率达94.43%,吸附量为126.17mg/g。改性橙皮对Pb^2+的吸附方式符合准二级动力学模型,通过Langmuir等温吸附方程模拟,改性橙皮的最大吸附量为156.98mg/g。改性橙皮是性能良好、可重复使用、安全环保的生物吸附剂。
The adsorption of Pb^2+by orange peel was studied,the orange peel was modified by H 3PO 4,NaOH,absolute ethanol-NaOH,CaCl2-anhydrous ethanol-NaOH,etc.The effects of adsorption time,adsorbent amount,adsorption temperature and acidity of solution on the adsorption of Pb 2+were investigated.The morphology of the modified orange peel before and after the adsorption of Pb 2+was characterized by scanning electron microscopy and infrared spectroscopy.The results showed that in the four kinds of modified orange peel,the modified orange peel prepared with CaCl 2-anhydrous ethanol-NaOH had the best adsorption effect on Pb 2+.When the adsorption time was 120 min,the adsorption of modified orange peel adsorbent to Pb^2+was saturated.The optimum adsorption temperature was 40℃,and the best adsorption solution acidity was pH=5.0.When the initial concentration of Pb^2+was 200 mg/L,the optimum input of adsorbents was 0.15 g,the adsorption rate could reach 94.43%and the adsorption capacity could reach 125.57 mg/g;and the adsorption mode of modified orange peel on Pb^2+conforms to the quasi two stage kinetic model,the maximum adsorption capacity of the modified orange peel was 156.98 mg/g by the simulation of Langmuir isothermal adsorption equation.Modified orange peel was a biosorbent with good performance,reusability,safety and environmental protection.
作者
张玉敏
郭艳华
周伟
胡思前
陈代秀
夏伟丽
ZHANG Yu-min;GUO Yan-hua;ZHOU Wei;HU Si-qian;CHEN Dai-xiu;XIA Wei-li(College of Chemical and Environmental Engineering,Jianghan University,Wuhan 430056,China)
出处
《天然产物研究与开发》
CAS
CSCD
北大核心
2019年第10期1807-1814,共8页
Natural Product Research and Development
基金
武汉市科技攻关计划(2014022905011274)
关键词
生物吸附剂
化学改性
橙皮
铅离子
biosorbent
chemical modification
orange peel
lead ion
