柚子皮的交联改性及其吸附Pb^(2+)性能研究  

Crosslinking Modification of Pomelo Peel and Its Pb^(2+) Adsorption Performance

作　　者：杨琦 茄丽梅 李国伟 谢尚宾 姚增玉[1] 戚建华[1] Yang Qi;Qie Limei;Li Guowei;Xie Shangbin;Yao Zengyu;Qi Jianhua(Key Laboratory of Ministiy of Education for Forest Resources Conservation and Ltilization in the Southwest Mountains of China,Southwest Forestry7 Lniversity,Kunming Yunnan 650224,China)

机构地区：[1]西南林业大学西南山地森林资源保育与利用教育部重点实验室,云南昆明650224

出　　处：《西南林业大学学报（自然科学）》2018年第5期154-160,共7页Journal of Southwest Forestry University：Natural Sciences

基　　金：国家自然科学基金项目(31770673;51268052)资助

摘　　要：采用碱催化甲醛交联对柚子皮进行改性处理,优化改性工艺提高其对Pb^(2+)的吸附性能,减少其水溶出物;通过扫描电镜、X射线能谱、傅里叶红外光谱、元素分析等方法对改性柚子皮进行了表征。结果表明:1 g柚子皮优化后的改性工艺为,1 mol/L的氢氧化钠溶液20 mL,质量体为37%甲醛溶液15 mL,在80℃下反应4 h;改性处理使柚子皮变得更加粗糙,Na^+与柚子皮中的酚羟基、羧基等酸性官能团中的质子以及K^+发生交换形成钠盐,吸附过程中Pb^(2+)与Na^+、Ca^(2+)发生离子交换。改性不仅大幅提高了柚子皮对Pb2+的吸附量,并有效降低了水溶出液的化学需氧量。1n this study,the alkali-catalyzed crosslinking with formaldehyde was used to modify pomelo peel.The modification process was optimized to improve its Pb2+adsorption performance and to reduce the water-soluble matter.The modified pomelo peel was characterized by scanning electron microscopy,X-ray energy spectrum,Fourier transform infrared spectroscopy and elemental analysis.The findings indicated that taking 1 g pomelo peel for example,the optimized modification process was as follows:1 mo^L sodium hydroxide solution 20 mL,37%formaldehyde solution(w/v)15 mL,reacted at 80^for 4 h.The modification process made the pomelo peel rougher.Na+exchanges with the protons in the acidic functional groups such as phenolic hydroxyl and carboxyl groups,and K+in the pomelo peel to form sodium salts.During the adsorption process,Pb2+underwent ion exchange with Na+and Ca2+.The modification not only greatly increased the Pb2+adsorption performance,but also effectively reduced the chemical oxygen demand of the aqueous extract from the pomelo peel.

关 键 词：铅 甲醛 交联改性 柚子 吸附性能 

分 类 号：X703[环境科学与工程—环境工程]