改性荷叶对1,4-苯二酚吸附性能的研究

Adsorption Characteristics of Hydroquinone on Modified Lotus Leaf

以天然荷叶为原料、三乙烯四胺为改性剂,对荷叶进行改性处理,并用吸附法处理1,4-苯二酚废水.采用响应面分析方法对荷叶改性工艺进行优化,得到最佳工艺条件为:反应温度81.8℃,反应时间3.8 h,液料比为3 mL·g^(-1).考察吸附时间、吸附剂用量及pH等因素对吸附过程的影响,并从热力学方面探讨了其吸附机理.结果表明:吸附过程符合Langmuir和Temkin等温吸附模型,313 K时改性荷叶对1,4-苯二酚的最大吸附量为1.384 mmol·g^(-1),且吸附过程是自发的吸热过程.

The lotus leaf chemically modified by triethylenetetramine was prepared as adsorbent to remove hy- droquinone from aqueous solution. Response surface methodology was applied to optimize the experimental conditions. The optimal conditions were reaction temperature of 81.8 ℃, reaction time of 3.8 h and ratio of triethylenetramine and material of 3 mL · g^-l. A series of factors affecting the adsorption process such as the contact time, adsorbent dosage and pH were investigated. The isothermal process of hydroquinone was de- scribed very well by the Langmuir and Temkin models , the maximum adsorption capacity onto modified lotus leaf was 1. 384 mmol· g^-1 at the temperature of 313 K. Thermodynamic parameters indicated that the adsorp- tion process conformed to spontaneous and endothermic process.