地表水中的砷(As)污染已成为全球关注的问题,尤其是第三世界国家,必须开发先进的材料和有效的处理方法来解决这一问题。在本文中,制备了铁掺杂的ZIF-8@MXene(Fe-ZIF-8@MXene)作为有效同时去除废水中As(III/V)的潜在吸附剂。为了调查这一点,在去除混合的As(III/V)之前和之后,对Fe-ZIF-8@MXene进行表征。傅里叶变换红外(FTIR)的结果,X射线衍射(XRD)扫描电子显微镜(SEM),透射电子显微镜(TEM),X射线光电子能谱(XPS),比表面积(BET)和零电荷点(pHpzc)表明Fe-ZIF-8@MXene成功制备,并在吸附As(III)和As(V)后保持稳定的结构。Fe-ZIF-8@MXene的粒径在0.5μm至2.5μm的范围内,其BET为531.7m2/g。对于这两种污染物,发现吸附遵循伪二级动力学,并且通过Langmuir吸附模型最佳拟合,相关系数(R2)为0.998和0.997,对于As(III)和As(V),分别。然后应用吸附剂从两个实际的水样中除去As,对As(III)和As(V)的最大去除率分别为91.07%和98.96%,分别。最后,还探讨了Fe-ZIF-8@MXene对As(III/V)的去除机制。在吸附过程中,在其丰富的表面官能团的作用下形成了多种复合物,涉及多种机制,其中包括范德华力,表面吸附,化学络合和静电相互作用。总之,这项研究表明,Fe-ZIF-8@MXene是一种先进且可重复使用的材料,可同时去除废水中的As(III/V)。
Arsenic (As) contamination of surface water has become a global concern, especially for the third world countries, and it is imperative to develop advanced materials and an effective treatment method to address the issue. In this paper, iron doped ZIF-8@MXene (Fe-ZIF-8@MXene) was prepared as a potential adsorbent to effectively and simultaneously remove As(III/V) from wastewater. To investigate this, Fe-ZIF-8@MXene was characterized before and after the removal of mixed As(III/V). The results of Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), specific surface area (BET) and point of zero charge (pHpzc) showed that Fe-ZIF-8@MXene was prepared successfully and kept a stable structure after As(III) and As(V) adsorption. The particle size of Fe-ZIF-8@MXene was in the range of 0.5 μm to 2.5 μm, where its BET was 531.7 m2/g. For both contaminants, adsorption was found to follow pseudo-second-order kinetics and was best-fitted by the Langmuir adsorption model with correlation coefficients (R2) of 0.998 and 0.997, for As(III) and As(V), respectively. The adsorbent was then applied to remove As from two actual water samples, giving maximum removal rates of 91.07% and 98.96% for As(III) and As(V), respectively. Finally, removal mechanisms for As(III/V) by Fe-ZIF-8@MXene were also explored. During the adsorption, multiple complexes were formed under the effect of its abundant surface functional groups involving multiple mechanisms, which included Van der Waals force, surface adsorption, chemical complexation and electrostatic interactions. In conclusion, this study demonstrated that Fe-ZIF-8@MXene was an advanced and reusable material for simultaneous removal of As(III/V) in wastewater.