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当前位置: 首页 > 文章 > 木质纤维纸基吸附材料及其重金属离子吸附性能 林业工程学报 2020 (3) 101-107
Position: Home > Articles > High-wet-strength paper-based lignocellulosic adsorbents and its heavy metal ion adsorption properties Journal of Forestry Engineering 2020 (3) 101-107

木质纤维纸基吸附材料及其重金属离子吸附性能

作  者：
蒋珊;周淼;邓稳;戴红旗;房桂干;吴伟兵
单  位：
中国林业科学研究院林产化学工业研究所;南京林业大学江苏省林业资源高效加工利用协同创新中心;齐鲁工业大学生物基材料与绿色造纸国家重点实验室
关键词：
纤维素;湿强纸;重金属离子;吸附;马来酸酐
摘  要：
以杨木化学机械浆为原料,通过抄纸和一步涂布工艺,获得了高湿强度、高金属离子吸附性能和易于分离回收的木质纤维纸基吸附材料;选用马来酸酐和次磷酸钠作为绿色改性剂提高纸基吸附材料的湿强度和羧基含量。研究表明,增加马来酸酐浓度同时提高了木质纤维间的交联程度和羧基含量,进而增加了纸基材料的湿强度和金属离子吸附位点数量。其中纸基吸附材料的湿强度可达到其干强度的35%,羧基含量可达到0.69mmol/g。随着马来酸酐溶液浓度的增加,纸基吸附材料的羧基含量及对重金属离子吸附性能也显著提高。吸附试验表明,吸附动力学和热力学分别很好地拟合了准二级方程和Langmuir模型(决定系数R~2≥0.998),对Cu~(2+)和Pb~(2+)的理论最大吸附容量分别为35.4和110.0 mg/g。基于造纸加填工艺在纸基吸附材料中负载20%多孔沸石填料以提高吸附容量并降低生产成本,其对Cu~(2+)和Pb~(2+)的理论最大吸附容量分别提高到56.5和126.6 mg/g。该多功能纸基吸附材料在克服传统吸附材料吸附剂不易分离、回收利用等问题的同时,具备了大规模生产的潜力,为木质纤维的全质化和高值化利用提供了新的思路和方法。
译  名：
High-wet-strength paper-based lignocellulosic adsorbents and its heavy metal ion adsorption properties
作  者：
JIANG Shan;ZHOU Miao;DENG Wen;DAI Hongqi;FANG Guigan;WU Weibing;Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology,Nanjing Forestry University;Institution of Chemical Industry of Forestry Products,CAF;State Key Laboratory of Biobased Material and Green Papermaking,Qilu University of Technology;
关键词：
lignocellulose;;wet-strength paper;;heavy metal ion;;adsorption;;maleic anhydride
摘  要：
Paper-based lignocellulosic adsorbents with advantages of high-wet-strength,high adsorption capacity and good for recycling capability were prepared from the polar chemimechanical pulp by the simple papermaking and one-step dip coating method. Maleic anhydride and sodium hypophosphate were selected as a green crosslinking reagent,and the cross-linking reaction was used to increase the wet strength as well as the carboxyl content of the paper-based adsorbents.The results showed that the increase in the concentration of MA increased the crosslinking degree and the carboxyl content of wood fibers,which increased the wet strength of paper-based materials and the number of metal ion adsorption sites. The wet strength reached 35% of their dry strength and the carboxyl content was tuned to be 0.69 mmol/g. With the increase of the concentration of maleic anhydride,the carboxyl content of adsorbent and its adsorption performance to heavy metal ions were also significantly improved. The adsorption kinetic and thermodynamics studies of Cu~(2+) and Pb~(2+) explained that the pseudo-second-order equation and Langmuir model( R~2≥0.998) could be the best fitting model.The theoretical maximum adsorption capacities of Cu~(2+) and Pb~(2+) were high up to 35.4 and 110.0 mg/g,respectively. At the same time,combined with the papermaking process,the theoretical maximum adsorption capacities of Cu~(2+) and Pb~(2+)were high up to 56.5 and 126.6 mg/g by adding the porous zeolite filler without great reduction in wet strength of the paper-based adsorbent. It not only increased the adsorption capacity of the paper-based adsorbent,but also reduced the production cost. The synthetic strategy of multifunctional paper based on polar chemimechanical pulp had the potential for mass production while overcoming the problems of traditional adsorbents,providing new ideas and methods for the large scale and high-value utilization of lignocellulose.

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