Singh Alka, Tomar Richa, Singh N B
Department of Chemistry & Biochemistry, Sharda University, Greater Noida, India.
Research Development Centre, Sharda University, Greater Noida, India.
Environ Monit Assess. 2024 May 22;196(6):569. doi: 10.1007/s10661-024-12686-z.
Nanomaterials are widely employed in wastewater treatment, among which nanoferrites and their composites hold significant prominence. This study adopts a green approach to synthesize zinc ferrite nanoparticles, subsequently integrating them with polyaniline (PANI) to fabricate the ZnFeO-PANI nanocomposite. Characterization of the prepared ZnFeO-PANI nanocomposite was conducted using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopic (SEM) techniques. Using Scherrer's equation, the crystallite size of the synthesized zinc ferrite nanoparticles was found to be 17.67 nm. SEM micrographs of the ZnFeO-PANI nanocomposite revealed that in situ polymerization of ZnFeO with polyaniline transforms the amorphous surface morphology of the polymer into a homogeneous nanoparticle structure. The adsorption of crystal violet (CV) dye onto the surface of the ZnFeO-PANI nanocomposite depends on pH, adsorbent dosage, temperature, concentration levels and duration. The Langmuir adsorption model fitted the data well, indicating adherence to a pseudo-second-order kinetic pattern. Thermodynamic values ΔG°, ΔH° and ΔS° indicated that the adsorption process occurred spontaneously. Advantages and disadvantages of the technique have also been highlighted. Mechanism of adsorption is discussed. From the obtained results, it is evident that the ZnFeO-PANI nanocomposite holds promise as a sorbent for the removal of dye from wastewater.
纳米材料在废水处理中得到广泛应用，其中纳米铁氧体及其复合材料占据显著地位。本研究采用绿色方法合成锌铁氧体纳米颗粒，随后将其与聚苯胺（PANI）结合制备ZnFeO - PANI纳米复合材料。使用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）技术对制备的ZnFeO - PANI纳米复合材料进行表征。利用谢乐方程，发现合成的锌铁氧体纳米颗粒的微晶尺寸为17.67纳米。ZnFeO - PANI纳米复合材料的SEM显微照片显示，ZnFeO与聚苯胺的原位聚合将聚合物的无定形表面形态转变为均匀的纳米颗粒结构。结晶紫（CV）染料在ZnFeO - PANI纳米复合材料表面的吸附取决于pH值、吸附剂用量、温度、浓度水平和时间。朗缪尔吸附模型与数据拟合良好，表明符合准二级动力学模式。热力学值ΔG°、ΔH°和ΔS°表明吸附过程是自发进行的。该技术的优缺点也已突出显示。讨论了吸附机理。从所得结果可以明显看出，ZnFeO - PANI纳米复合材料有望作为从废水中去除染料的吸附剂。
