Abstract

The discharge of phosphorus from urban and industrial wastewater into water bodies causes eutrophication and algae blooms. What it seems essential is that treatment of such wastewater before its discharge into the environment. The main purpose of this study is to investigate phosphorus adsorption from aqueous solutions by using multi-walled carbon nanotubes (MWCNT) as the adsorbent. In experiments, Scanning Electron Microscope (SEM) is applied for characterizing the adsorbent. The impact of variables effecting the adsorption of phosphorus such as amount of adsorbent, the initial concentration of phosphorus and pH are studied at room temperatures. Furthermore, for assessing data, isotherm and kinetic models are considered. The results indicate that the elevation of pH and the amount of adsorbent enhance the efficiency of phosphorus adsorption, while an increase in phosphorus concentration decrease adsorption. The results also show that phosphorus adsorption follows the Freundlich isotherm model. To determine the adsorption kinetics, in traparticle diffusion, pseudo-first-order and pseudo-second-order kinetics are widely used. Finding results indicate that a good compliance with a pseudo-second-orderkinetic model. Finally, results demonstrate that thatmulti-walled carbon nanotubes (MWCNT) is good adsorbent for the elimination of phosphorus from aqueous solutions in a relatively short time, owing to their highcapacity of adsorption.

摘要

城市和工业废水中的磷排放到水体中会导致富营养化和藻类大量繁殖。似乎至关重要的是，在将此类废水排放到环境中之前对其进行处理。本研究的主要目的是研究使用多壁碳纳米管 (MWCNT) 作为吸附剂从水溶液中吸附磷。在实验中，扫描电子显微镜 (SEM) 用于表征吸附剂。在室温下研究了影响磷吸附的变量的影响，例如吸附剂的量、磷的初始浓度和 pH 值。此外，为了评估数据，考虑了等温线和动力学模型。结果表明，pH值的升高和吸附剂的用量提高了磷的吸附效率，而磷浓度的增加会降低吸附。结果还表明，磷吸附遵循 Freundlich 等温线模型。为了确定吸附动力学，在捕集粒子扩散中，广泛使用准一级和准二级动力学。调查结果表明，与准二级动力学模型具有良好的依从性。最后，结果表明，多壁碳纳米管（MWCNT）具有较高的吸附能力，是在较短时间内去除水溶液中磷的良好吸附剂。准一级和准二级动力学被广泛使用。调查结果表明，与准二级动力学模型具有良好的依从性。最后，结果表明，多壁碳纳米管（MWCNT）具有较高的吸附能力，是在较短时间内去除水溶液中磷的良好吸附剂。准一级和准二级动力学被广泛使用。调查结果表明，与准二级动力学模型具有良好的依从性。最后，结果表明，多壁碳纳米管（MWCNT）具有较高的吸附能力，是在较短时间内去除水溶液中磷的良好吸附剂。