The present study deals with the synthesis of an efficient Polypyrrole/Fe₃O₄ (PPY/Fe₃O₄) nanocomposite based material and its utilisation in the adsorptive removal of Pb (II), Cd (II) and Zn (II) ions. The synthesised PPY/Fe₃O${}_4$ nanocomposite based adsorbent has been characterised by means of FE-SEM (Field emission scanning electron microscope), EDX (Energy dispersive X-ray), P-XRD (Powder X-ray diffraction) and FTIR (Fourier transform infra-red) techniques. The characteristic FTIR peaks were found at 3427 cm⁻¹, 1618 cm⁻¹, 1395 cm⁻¹, 1086 cm⁻¹, 1180 cm⁻¹, 525 cm${}^{-1}$and 453 cm⁻¹ and indicating the presence of N–H, C=N, C–O, C–N, C–C, C–Fe, Fe–O etc bonds on the surface of PPY/Fe₃O${}_4$ nanocomposite. Adsorption of selected heavy metal ions on the surface of PPY/Fe₃O₄ was done by applying different adsorption parameters. The removal (%) of lead, cadmium and zinc ions was found to be 69.1%, 62.1% and 53.9% at 60 min, 54.9%, 51.9% and 36.9 at 1 g of PPY/Fe₃O₄ and 96.2%, 83.9% and 89.9% at pH 6, respectively. The suitability of adsorption process, mechanism and rate of adsorption has been observed using different isotherm and kinetic models. The maximum adsorption capacities (${\text{K}}_{\mathrm{la}}$) have been evaluated for lead, cadmium and zinc ions using Langmuir model as 11.350, 8.928 and 7.107 mg g⁻¹, respectively. The values of pseudo first order rate constants (k₁) for Pb (II), Cd (II) and Zn (II) ions on PPY/Fe₃O${}_4$nanocomposite were found to be -0.644 min⁻¹, -0.694 min${}^{-1}$and -0.563 min⁻¹, respectively. The pseudo second order rate constants were calculated for lead, cadmium and zinc ions as 1.122, 0.816 and 1.004 g mg⁻¹ min⁻¹, respectively.

本研究涉及一种高效的聚吡咯/ Fe ₃ O ₄（PPY / Fe ₃ O ₄）纳米复合材料的合成及其在吸附去除Pb（II），Cd（II）和Zn（II）离子中的利用。合成PPY / Fe ₃ O${}_4$基于纳米复合材料的吸附剂已通过FE-SEM（场发射扫描电子显微镜），EDX（能量色散X射线），P-XRD（粉末X射线衍射）和FTIR（傅立叶变换红外）技术进行了表征。特征FTIR峰被发现在3427厘米^-1，1618厘米^-1，1395厘米^-1，1086厘米^-1，1180厘米^-1，525厘米${}^{-\mathrm{1个}}$和453 cm ^-1表示在PPY / Fe ₃ O表面存在N–H，C = N，C–O，C–N，CC–C，C–Fe，Fe–O等键${}_4$纳米复合材料。通过应用不同的吸附参数，在PPY / Fe ₃ O ₄表面吸附了选定的重金属离子。发现在1 g PPY / Fe ₃ O _4中，铅，镉和锌离子的去除率（％）在60分钟时分别为69.1％，62.1％和53.9％，54.9％，51.9％和36.9，以及96.2％，83.9分别在pH值为6时为50％和89.9％。已使用不同的等温线和动力学模型观察了吸附过程的适用性，吸附机理和吸附速率。最大吸附量（${\text{ķ}}_{\mathrm{啦啦}}$）已使用Langmuir模型分别评估为11.350、8.928和7.107 mg g ^-1的铅，镉和锌离子。PPY / Fe ₃ O上Pb（II），Cd（II）和Zn（II）离子的伪一级速率常数（k ₁）的值${}_4$发现纳米复合材料为-0.644 min ^-1，-0.694 min${}^{-\mathrm{1个}}$和-0.563 min ^-1。计算出的铅，镉和锌离子的伪二级速率常数分别为1.122、0.816和1.004 g mg ^-1 min ^-1。