作 者：
刘蕾;任继巍;刘鑫露;郑兆娟;李鑫;欧阳嘉
单 位：
南京科技职业学院生物与环境学院;南京林业大学化学工程学院;南京林业大学林学院
关键词：
造纸废液;预处理;木质素磺酸盐;麦秆;分散性能;接触角
摘 要：
木质纤维原料是一种丰富的可再生资源,其中木质素分子结构最为复杂,木质素的综合利用度成为木质纤维原料生物炼制商业化的瓶颈和关键。当前,我国商品木质素磺酸盐主要来源于亚硫酸盐制浆造纸废液,而源于生物炼制的木质素磺酸盐材料的研究和应用却鲜有报道。我国是农业大国,麦秆资源丰富,笔者对亚硫酸氢镁预处理麦秆木质素磺酸盐进行了性质和应用初步研究。结果表明:与市售商用木质素磺酸盐(CMLS)相比较,麦秆木质素磺酸盐(IELS)磺酸基团较高,酚羟基和羧基含量较低;重均分子量和数均分子量分别为3 456 u和2 842 u,分子量分布均一;对于微晶纤维素的酶解有促进作用,添加1.0 g/L IELS,酶解48 h纤维素酶解得率达72.3%,较空白组提高了7.7%;添加质量浓度2.0 g/L的超滤麦秆木质素磺酸盐(UFLS)可使甲基咪草烟(IMM)颗粒表面Zeta电位降至-30.3 mV;质量浓度2.0 g/L的UFLS液滴在IMM压片表面接触角为72.38°,易于在疏水材料上铺展开来。研究结果可为生物炼制来源木质素磺酸盐的资源化高效利用提供理论参考。
译 名：
Properties and applications of lignosulfonate from wheat straw spent liquor pretreated by magnesium bisulfite
作 者：
LIU Lei;REN Jiwei;LIU Xinlu;ZHENG Zhaojuan;LI Xin;OUYANG Jia;School of Biology and Environment,Nanjing Polytechnic Institute;College of Chemical Engineering,Nanjing Forestry University;College of Forestry,Nanjing Forestry University;
关键词：
papermaking spent liquor;;pretreat;;lignosulfonate;;wheat straw;;dispersibility;;contact angle
摘 要：
Lignocellulosic material is a kind of abundant and renewable resource,which mainly contains three kinds of chemical components,i.e.,cellulose,hemicellulose,and lignin. The molecular structure of lignin is the extremely complex with high crosslinking degree. The comprehensive utilization of lignin becomes the bottleneck of the commercialization of lignocellulosic biorefinery. Therefore,to efficiently utilize lignin,the key is to improve the cost-effectiveness of biorefinery of lignocellulosic materials. At present,the commercial lignosulfonates in China mainly come from the by-products of the sulfite pulping and papermaking industries,but the research and applications of lignosulfonates from biorefinery have been rarely reported. Magnesium bisulfite pretreatment is a new pretreatment technology developed in recent years. After the magnesium bisulfite pretreatment,most of hemicellulose and lignin from wheat straw could be removed at the same time,which obviously improved the enzymatic hydrolysis yield. At the same time,a large amount of high-valued xylo-oligosaccharide and lignosulfonate were co-produced in the spent liquor. As a large agricultural country,China has abundant wheat straw resources,showing the advantage of abundant raw materials for the process of biorefinery. The research of wheat straw biorefinery could not only realize the optimal utilization of resources,but also reduce the pressure of environmental pollution. The properties and applications of lignosulfonate from the magnesium bisulfite pretreated wheat straw were studied in this paper. The results showed that,compared with commercial lignosulfonates(CMLS),the contents of sulfonic groups of wheat straw lignosulfonate(IELS) were higher,the contents of phenolic hydroxyl group and carboxyl groups were lower; the viscosity decreased; the weight average molecular weight and number average molecular weight were 3 456 Da and 2 842 Da,respectively,the dispersivity was 1.216 and the molecular weight distribution was uniform. It can promote the enzymatic hydrolysis yield of microcrystalline cellulose,and the enzymatic hydrolysis yield reached 72. 3% by adding 1 g/L IELS for 48 h hydrolysis,which was 7.7% higher than the control group. The results showed that the zeta potential of imazethapyr methyl(IMM) particles decreased to-30. 3 mV by adding 2. 0 g/L ultrafiltration lignosulfonate(UFLS),and the contact angle of UFLS droplet on the surface of IMM tablet was 72.38°. It was easy to be spread on hydrophobic materials. The results provided a theoretical reference for efficient utilization of lignosulfonates from biorefinery. The research effectively enhanced the commercial value of the biorefinery of lignocellulosic materials and had practical significance for solving the energy shortage,reducing environmental pollution,and taking the road of sustainable development in China.
