摘要
利用Na OH对香蕉皮进行改性,制备改性吸附剂,研究吸附时间、温度、p H等3个因素对其氨氮吸附性能的影响。实验结果表明,Na OH改性提高了该吸附剂对氨氮的吸附能力,在较广温度范围内,该改性吸附剂保持着较高的吸附效率,在吸附氨氮过程中氨氮去除率随着p H值增大呈上升趋势,水质呈中性和碱性时,改性吸附剂表现出较高的吸附效率。相同氨氮初始浓度条件下,在吸附剂投加量增加,氨氮去除率升高,在氨氮浓度为6 mg/L时,可达到96.78%。在20℃温度条件下,饱和吸附量理论值达到9.478 7 mg/g。改性香蕉皮吸附剂对氨氮的吸附符合伪二阶吸附动力模型,氨氮饱和吸附数据符合Langmuir和Freundlich等温吸附模型。
A banana peel modified using sodium hydroxide was taken as a modified adsorbent in this experiment. The influence of adsorption time,temperature,and p H on the ammonia adsorption performance of the modified adsorbent was studied. Results showed that the adsorption capacity of the modified banana peel for ammonia was greatly improved after modification. In a wide temperature range,the modified adsorbent could maintain a relatively high adsorption efficiency. The removal efficiency in the process of ammonia nitrogen adsorption improved with increased p H values and adsorbent dosages under the same initial conditions. When the ammonia nitrogen concentration was 6 mg / L,the removal efficiency could reach 96. 78%. The theoretical value of the saturation adsorption could reach 9. 478 7 mg / g at 20 ℃ and was in agreement with the pseudo-second-order dynamic model,and Langmuir and Freundlich isotherm models.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第4期1807-1812,共6页
Chinese Journal of Environmental Engineering
基金
重庆市教委科学技术研究项目(KJ1401023)
关键词
香蕉皮
吸附剂
氨氮
温度
banana peel
adsorbent
ammonia nitrogen
temperature
