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首页> 外文期刊>Chemical engineering journal >Multiwalled carbon nanotubes as adsorbents for removal of herbicide diuron from aqueous solution
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Multiwalled carbon nanotubes as adsorbents for removal of herbicide diuron from aqueous solution

机译：多壁碳纳米管作为吸附剂，用于从水溶液中去除除草剂杜隆

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The adsorption of diuron onto as-prepared and oxidized multiwalled carbon nanotubes (MWCNTs) from aqueous solution has been studied through batch experiments, in which the effect of contact time, temperature, pH and coexisting Cu~(2+) were investigated. The adsorption performance of diuron onto MWCNTs fitted the pseudo-second-order model and apparent equilibrium was reached within 1 h. The experimental data showed good correlation with Freundlich, Langmuir and Polanyi-Manes models in the range of experimental concentrations, but followed Polanyi-Manes model most appropriate. The calculated thermodynamic parameters showed adsorption of diuron onto MWCNTs was exothermic and spontaneous. Except for the introduction of oxygen-containing functional groups onto the surfaces of MWCNTs, the oxidized treatment of as-prepared MWCNTs can also increase the surface area and the pore volume, which resulted in the increase adsorption of diuron in this study. The adsorption of diuron was found to be pH dependent, and more adsorption was observed under neutral and basic conditions. The presence of Cu~(2+) has no significant effect on the adsorption of diuron onto as-prepared MWCNTs, on the contrary, the presence of Cu~(2+) can greatly decrease the adsorption of diuron onto oxidized MWCNTs. In addition, competitive adsorption was greater at higher than at lower diuron concentrations.
机译：通过分批实验研究了敌草隆从水溶液中吸附到已制备和氧化的多壁碳纳米管（MWCNT）上的过程，研究了接触时间，温度，pH和Cu〜（2+）共存的影响。 Diuron对MWCNTs的吸附性能符合拟二级模型，并在1h内达到了明显的平衡。在实验浓度范围内，实验数据显示与Freundlich，Langmuir和Polanyi-Manes模型具有良好的相关性，但最适合遵循Polanyi-Manes模型。计算得到的热力学参数表明，对苯二酚在多壁碳纳米管上的吸附是放热和自发的。除了将含氧官能团引入到MWCNT的表面上之外，制备的MWCNT的氧化处理也可以增加表面积和孔体积，从而导致本研究中对二氮隆的吸附增加。发现敌草隆的吸附取决于pH，在中性和碱性条件下观察到更多的吸附。 Cu〜（2+）的存在对Diuron在制备的MWCNTs上的吸附没有显着影响，相反，Cu〜（2+）的存在可以大大降低Diuron在氧化的MWCNTs上的吸附。另外，竞争性吸附在更高的情况下比在较低的杜隆浓度下更大。

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