Gran Sidra, Aziz Rukhsanda, Rafiq Muhammad Tariq, Abbasi Maryam, Qayyum Abdul, Elnaggar Ashraf Y, Elganzory Hussein H, El-Bahy Zeinhom M, Hussein Enas E
Department of Environmental Science, International Islamic University, Islamabad 44000, Pakistan.
Centre for Interdisciplinary Research in Basic Sciences, International Islamic University, Islamabad 44000, Pakistan.
Polymers (Basel). 2021 Dec 20;13(24):4464. doi: 10.3390/polym13244464.
This research aims to assess the efficiency of the synthesized corncob as a cost-effective and eco-friendly adsorbent for the removal of heavy metals. Therefore, to carry out the intended research project, initially, the corncob was doped with nanoparticles to increase its efficiency or adsorption capacity. The prepared adsorbent was evaluated for the adsorption of cadmium (Cd) and chromium (Cr) from aqueous media with the batch experiment method. Factors that affect the adsorption process are pH, initial concentration, contact time and adsorbent dose. The analysis of Cd and Cr was performed by using atomic absorption spectrometry (AAS), while the characterization of the adsorbent was performed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results showed that there is a significant difference before and after corncob activation and doping with CeO nanoparticles. The maximum removal for both Cd and Cr was at a basic pH with a contact time of 60 min at 120 rpm, which is 95% for Cd and 88% for Cr, respectively. To analyze the experimental data, a pseudo-first-order kinetic model, pseudo-second-order kinetic model, and intra-particle diffusion model were used. The kinetic adsorption studies confirmed that the experimental data were best fitted with the pseudo-second-order kinetic model (R = 0.989) and intra-particle diffusion model (R = 0.979). This work demonstrates that the cerium oxide/corncob nanocomposite is an inexpensive and environmentally friendly adsorbent for the removal of Cd and Cr from wastewater.
本研究旨在评估合成玉米芯作为一种经济高效且环保的吸附剂用于去除重金属的效率。因此，为开展预期的研究项目，首先将纳米颗粒掺杂到玉米芯中以提高其效率或吸附能力。采用批量实验法对制备的吸附剂从水介质中吸附镉（Cd）和铬（Cr）的性能进行评估。影响吸附过程的因素有pH值、初始浓度、接触时间和吸附剂用量。使用原子吸收光谱法（AAS）对Cd和Cr进行分析，同时使用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）对吸附剂进行表征。结果表明，玉米芯活化并掺杂CeO纳米颗粒前后存在显著差异。Cd和Cr的最大去除率均出现在碱性pH值、120 rpm转速下接触时间为60分钟时，Cd的去除率为95%，Cr的去除率为88%。为分析实验数据，使用了准一级动力学模型、准二级动力学模型和颗粒内扩散模型。动力学吸附研究证实，实验数据与准二级动力学模型（R = 0.989）和颗粒内扩散模型（R = 0.979）拟合效果最佳。这项工作表明，氧化铈/玉米芯纳米复合材料是一种用于从废水中去除Cd和Cr的廉价且环保的吸附剂。
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