为活性炭应用于酚醛类化工废水深度处理,研究了活性炭对此类废水中有机物的动态吸附性能以及氮的去除。通过动态吸附试验,选出吸附效果最佳的活性炭,研究其对废水中有机物的等温吸附和动力学,并利用比表面积(BET)测试法和傅里叶红外光谱...为活性炭应用于酚醛类化工废水深度处理,研究了活性炭对此类废水中有机物的动态吸附性能以及氮的去除。通过动态吸附试验,选出吸附效果最佳的活性炭,研究其对废水中有机物的等温吸附和动力学,并利用比表面积(BET)测试法和傅里叶红外光谱(FTIR)表征技术分析活性炭表面特征,同时探讨不同因素对吸附的影响,再以床厚服务时间(Bed-Depth-Service Time, BDST)模型对动态试验数据进行线性拟合分析。结果表明:椰壳炭吸附效果最好,朗格缪尔(Langmuir)吸附等温线模型和拟二级动力学模型可以较好地描述其动态吸附行为;吸附过程中粒子内扩散并不是唯一的限速步骤,有机物的吸附主要发生在边界层扩散阶段;根据椰壳炭孔状结构的变化说明吸附主要发生在微孔区;—OH、—COOH、C=C等官能团能与有机物相互反应,主要涉及氢键、π-π相互作用、静电引力;含氮化合物会与有机物产生竞争吸附,影响其吸附量;BDST模型不仅可以有效描述吸附床高度与穿透时间之间的关系,而且能够准确地预测新的操作条件下的有机物穿透时间,误差均小于5%。展开更多
The continuous adsorption of Cd 2+ on vermiculite was studied,in addition the modification and regeneration of the adsorbent were inspected.The results showed that vermiculite had a strong adsorption effect and the su...The continuous adsorption of Cd 2+ on vermiculite was studied,in addition the modification and regeneration of the adsorbent were inspected.The results showed that vermiculite had a strong adsorption effect and the successive operation of adsorption to Cd 2+ was practical;The adsorption capacity of vermiculite can be remarkably increased when modified with 1mol/L HCl or 1mol/L NaCl.Moreover the adsorbent can be readily regenerated with 1mol/L NaCl and used repeatly.展开更多
文摘为活性炭应用于酚醛类化工废水深度处理,研究了活性炭对此类废水中有机物的动态吸附性能以及氮的去除。通过动态吸附试验,选出吸附效果最佳的活性炭,研究其对废水中有机物的等温吸附和动力学,并利用比表面积(BET)测试法和傅里叶红外光谱(FTIR)表征技术分析活性炭表面特征,同时探讨不同因素对吸附的影响,再以床厚服务时间(Bed-Depth-Service Time, BDST)模型对动态试验数据进行线性拟合分析。结果表明:椰壳炭吸附效果最好,朗格缪尔(Langmuir)吸附等温线模型和拟二级动力学模型可以较好地描述其动态吸附行为;吸附过程中粒子内扩散并不是唯一的限速步骤,有机物的吸附主要发生在边界层扩散阶段;根据椰壳炭孔状结构的变化说明吸附主要发生在微孔区;—OH、—COOH、C=C等官能团能与有机物相互反应,主要涉及氢键、π-π相互作用、静电引力;含氮化合物会与有机物产生竞争吸附,影响其吸附量;BDST模型不仅可以有效描述吸附床高度与穿透时间之间的关系,而且能够准确地预测新的操作条件下的有机物穿透时间,误差均小于5%。
文摘The continuous adsorption of Cd 2+ on vermiculite was studied,in addition the modification and regeneration of the adsorbent were inspected.The results showed that vermiculite had a strong adsorption effect and the successive operation of adsorption to Cd 2+ was practical;The adsorption capacity of vermiculite can be remarkably increased when modified with 1mol/L HCl or 1mol/L NaCl.Moreover the adsorbent can be readily regenerated with 1mol/L NaCl and used repeatly.
