竹炭及改性竹炭对甲醛吸附性能研究

发布时间：2018-08-29 17:11

【摘要】：甲醛是室内空气的主要污染物之一。采用改性剂对竹炭进行改性,提高竹炭对甲醛的吸附效果。本文以KMnO4/MnSO4、H2SO4/H2O2、FeCl3/HCl三类改性剂,分别对竹炭进行了表面改性；结合表征手段分析了改性前后的竹炭的变化,考察了甲醛溶液初始浓度、吸附剂用量、吸附温度以及吸附时间对改性前后竹炭吸附甲醛的性能影响；分析了甲醛的吸附动力学。此外,着重考察了H2SO4/H2O2改性竹炭的制备工艺。研究结果如下：1.采用浸渍法制备KMnO4/MnSO4改性竹炭。运用Boehm滴定、SEM、FTIR和XRD对竹炭及KMnO4/MnSO4改性竹炭进行表征；考察了甲醛溶液初始浓度、吸附剂用量、吸附温度以和吸附时间对竹炭及KMnO4/MnSO4改性竹炭吸附甲醛的影响,获得最优吸附条件为：甲醛溶液初始浓度为42 mg/mL、吸附剂用量为17 mg/mL、吸附温度为313 K,吸附时间为5 h,此吸附条件下,KMnO4/MnSO4改性竹炭吸附甲醛的效果最好,甲醛吸附量达到50.25 mg/g；竹炭的吸附过程符合准一级和准二级动力学方程,KMnO4/MnSO4改性竹炭的吸附符合过程准二级动力学方程。2.采用浸渍法制备H2SO4/H2O2改性竹炭。研究了H2SO4/H2O2改性竹炭的制备工艺条件,考察了活化温度、改性时间、竹炭用量、改性剂用量对制备工艺的影响,并通过正交试验分析,得到最佳制备工艺条件为：活化温度为623 K,改性时间为5 h,竹炭用量为10 g,改性剂用量为6 mL/g。运用Boehm滴定、SEM、FTIR和XRD对竹炭及H2SO4/H2O2改性竹炭进行表征：考察了甲醛溶液初始浓度、吸附剂用量、吸附温度以及吸附时间对竹炭及H2SO4/H2O2改性竹炭吸附甲醛的影响,获得最优吸附条件为：甲醛溶液初始浓度为52.5 mg/mL、吸附剂用量为17 mg/mL、温度为313 K,吸附时间4 h,此吸附条件下,H2SO4/H2O2改性竹炭吸附甲醛的效果最好,甲醛吸附量达到46.39 mmg/g；竹炭的吸附过程符合准一级和准二级动力学方程,H2SO4/H2O2改性竹炭的吸附符合准二级动力学方程。3.采用浸渍法制备FeCl3/HCl改性竹炭。运用Boehm滴定、SEM, FTIR和XRD对竹炭及FeCl3/HCl改性竹炭进行表征；考察了甲醛溶液初始浓度、吸附剂用量、吸附温度和吸附时间对竹炭及FeCl3/HCl改性竹炭吸附甲醛的影响,获得
[Abstract]:Formaldehyde is one of the main pollutants in indoor air. The modified bamboo charcoal was modified to improve the adsorption effect of formaldehyde on bamboo charcoal. In this paper, the surface modification of bamboo charcoal was carried out with three kinds of KMnO4/MnSO4,H2SO4/H2O2,FeCl3/HCl modifiers, the changes of bamboo charcoal before and after modification were analyzed by means of characterization, the initial concentration of formaldehyde solution and the amount of adsorbent were investigated. The effects of adsorption temperature and adsorption time on the adsorption of formaldehyde on bamboo charcoal before and after modification were studied, and the adsorption kinetics of formaldehyde was analyzed. In addition, the preparation process of H2SO4/H2O2 modified bamboo charcoal was investigated. The results are as follows: 1. KMnO4/MnSO4 modified bamboo charcoal was prepared by impregnation method. Boehm titration was used to characterize bamboo charcoal and KMnO4/MnSO4 modified bamboo charcoal, and the effects of initial concentration of formaldehyde solution, amount of adsorbent, adsorption temperature and adsorption time on the adsorption of formaldehyde on bamboo charcoal and KMnO4/MnSO4 modified bamboo charcoal were investigated. The optimum adsorption conditions are as follows: the initial concentration of formaldehyde solution is 42 mg/mL, the adsorption temperature is 313K, the adsorption time is 5 h, the adsorption temperature is 313K, the adsorption time is 5h. under this adsorption condition, the adsorption effect of bamboo charcoal modified by KMnO _ 4 / MnSO _ 4 is the best, and the adsorption amount of formaldehyde is 50.25 mg/g;. The adsorption process of bamboo charcoal accords with the quasi first order and quasi second order kinetic equations. The adsorption of KMnO 4 / MnSO 4 modified bamboo charcoal accords with the process of quasi second order kinetic equation. H2SO4/H2O2 modified bamboo charcoal was prepared by impregnation method. The preparation conditions of bamboo charcoal modified by H2SO4/H2O2 were studied. The effects of activation temperature, modification time, amount of bamboo charcoal and modifier on the preparation process were investigated. The optimum preparation conditions are as follows: activation temperature is 623K, modification time is 5h, amount of bamboo charcoal is 10g, dosage of modifier is 6 mL/g.. Boehm titration was used to characterize bamboo charcoal and H2SO4/H2O2 modified bamboo charcoal. The effects of initial concentration of formaldehyde solution, amount of adsorbent, adsorption temperature and adsorption time on the adsorption of formaldehyde on bamboo charcoal and H2SO4/H2O2 modified bamboo charcoal were investigated. The optimum adsorption conditions were obtained as follows: the initial concentration of formaldehyde solution was 52.5 mg/mL, the amount of adsorbent was 313K at 17 mg/mL, and the adsorption time was 4 h. Under this condition, the adsorption effect of H _ 2SO _ 4 / H _ 2O _ 2 modified bamboo charcoal was the best, and the amount of formaldehyde adsorbed was 46.39 mmg/g;. The adsorption process of bamboo charcoal accords with the quasi-first-order and quasi-second-order kinetic equations. The adsorption of H _ 2SO _ 4 / H _ 2O _ 2 modified bamboo charcoal accords with the quasi-second-order kinetic equation. FeCl3/HCl modified bamboo charcoal was prepared by impregnation method. Bamboo charcoal and FeCl3/HCl modified bamboo charcoal were characterized by Boehm titration, FTIR and XRD. The effects of initial concentration of formaldehyde solution, amount of adsorbent, adsorption temperature and time on the adsorption of formaldehyde on bamboo charcoal and FeCl3/HCl modified bamboo charcoal were investigated.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X51;O647.3

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