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电化学氧化与生物法联合降解木质素

崔晓敏 王一平 梁继东

崔晓敏, 王一平, 梁继东. 电化学氧化与生物法联合降解木质素[J]. 环境科学研究, 2016, 29(3): 434-441.
引用本文: 崔晓敏, 王一平, 梁继东. 电化学氧化与生物法联合降解木质素[J]. 环境科学研究, 2016, 29(3): 434-441.
CUI Xiaomin, WANG Yiping, LIANG Jidong. Combined Degradation of Lignin by Electrochemical Oxidation and Biodegradation (ECO-BD)[J]. Research of Environmental Sciences, 2016, 29(3): 434-441.
Citation: CUI Xiaomin, WANG Yiping, LIANG Jidong. Combined Degradation of Lignin by Electrochemical Oxidation and Biodegradation (ECO-BD)[J]. Research of Environmental Sciences, 2016, 29(3): 434-441.

电化学氧化与生物法联合降解木质素

基金项目: 陕西省自然科学基金项目(2015JQ2052);2014年度陕西省留学人员科技活动择优资助项目;国家自然科学基金项目(51409209)

Combined Degradation of Lignin by Electrochemical Oxidation and Biodegradation (ECO-BD)

  • 摘要: 为开发经济和环境安全的木质素降解技术,采用ECO-BD(electrochemical oxidation and biodegradation, 电化学氧化与生物降解)工艺联合降解木质素,以Ti/Sn-SbO2电极为阳极,无水Na2SO4为电解质,在恒电流条件下,应用响应面法得到ECO-BD联合降解木质素的最佳电化学条件:电流密度为8.64 mA/cm2,电量为20.00 kC,c(Na2SO4)为0.15 mol/L. 在该条件下,ECO-BD对1 g/L木质素溶液的CODCr去除率为59.31%,单位能耗为28.87 kW·h/kg. 采用傅里叶变换红外光谱及气相色谱-质谱对ECO-BD联合降解木质素过程中的降解产物进行分析发现,ECO能有效地破坏木质素的酚羟基结构及发色基团,木质素多聚体的醚键先被断裂形成单体,随后芳环结构被氧化生成醌类化合物,再进一步开环和裂解生成小分子酸类或被矿化成CO2和H2O;电解后溶液生化可降解性由0.20~0.25升至0.31~0.37,缩短了后续生物降解时间. 研究显示,ECO能先行打断抵御微生物攻击的木质素顽固键合结构,有利于后续BD消除残余碎片,实现木质素的ECO-BD高效低成本降解.

     

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出版历程
  • 收稿日期:  2015-07-22
  • 修回日期:  2015-11-09
  • 刊出日期:  2016-03-25

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