纳米复合鞣剂的性能及生物可降解性研究

Properties and Biodegradability of Nano-tanning Agent

通过将亲水改性天然动、植物油脂(菜籽油和鱼油)中加入纳米前驱体(硅酸酯),制备了纳米复合鞣剂。测定了纳米复合鞣剂的稳定性以及分散载体的乳化和耐酸耐电解质稳定性,并测定了纳米复合鞣剂鞣制的成革的热稳定性和柔软性。最后用生化呼吸曲线法和BOD5/COD法定性分析,纳米复合鞣剂在活性污泥作用下的好氧生物降解特性,同时用降解5d的COD及TOC去除率,定量表征纳米复合鞣剂的生物降解性。试验结果表明:分散载体的乳化及耐酸耐电解质性能较好,纳米复合鞣剂的稳定性好;1000mg/L的纳米复合鞣剂溶液生化呼吸曲线在内源呼吸线之上、BOD5/COD值大于0.45、降解5d后的COD去除率为93.45%、TOC去除率为89.08%,表明纳米复合鞣剂的生物降解性能良好,是一种环境友好的鞣革材料。

A kind of nano-tanning agent was synthesized via hydrophilic modification of natural oil（rapeseed oil and fish oil） followed by blending with tetraethoxy silane.The stability of nano-tanning agent and the emulsion stability,acid and electrolyte resistibility of dispersion supporter were investigated.The thermal stability and softness of leather treated by above nano-tanning agent were also studied.Finally the biodegradability of the nano-tanning agent under activated sludge was qualitatively evaluated base on determinations of biological respiration curve and BOD5/COD value.To quantitative analysis of the biodegradability,COD and TOC removal after 5d biodegradation were also carried out.The results indicate that the emulsion stability,acid and electrolyte resistibility of dispersion supporter and the stability of nano-tanning agent are good;the biological respiration curve of 1 000mg/L nano-tanning agent solution is above the endogenous respiration curve,BOD5/COD value is greater than 0.45,the COD and TOC removal after 5d biodegradation is 93.45% and 89.08%,respectively.The results show that the nano-tanning agent is an environmental friendly material with good biodegradability.