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Preparation and characterization of a novel functionalized agricultural waste-based adsorbent for Cu2+ removal: Evaluation of adsorption performance using response surface methodology
Sustainable Chemistry and Pharmacy ( IF 5.5 ) Pub Date : 2021-06-12 , DOI: 10.1016/j.scp.2021.100468
Elif Cerrahoğlu Kaçakgil , Seda Çetintaş

In this study, it was aimed to the improvement of adsorption capability with a novel modification method based on increasing surface activity of flaxseed waste (FW), an agricultural waste product, and the investigation of its usability as an effective adsorbent for Cu2+ removal. The modification method involves functionalization of FW with iron by adding FeCl3 to medium in presence of N, N-Dimethyl-formamide, poly (N-vinyl-pyrrolidone), and hexamethylenetetramine. The effect of parameters was investigated by conventional univariate analysis. In addition, Response Surface Methodology (RSM) based on multivariate analysis was used to improve the performance of Cu2+ adsorption onto iron-modified flaxseed waste (M − FW). Cu2+ removal efficiency was achieved as 91.46% ± 2.34 (N = 2) at an equilibrium time of only 15 min under determined optimum conditions as Co: 75 ppm, pH: 4.7, and m: 0.23 g. RSM was successfully applied for the prediction of adsorption. Adsorption nature was as a single-layer adsorption with a maximum adsorption capacity (Qmax) of 7.64 mg/g. The adsorption mechanism, determined to be chemically controlled, an exothermic and non-spontaneous process. Furthermore, pH-dependent adsorption showed that electrostatic interactions between M − FW and Cu2+ ions play an important role in adsorption mechanism. The results of characterization studies showed that a large surface area was provided with increased porosity of structure and desired changes occurred in target functional structures with modification. Moreover, modification and reusability of M − FW were evaluated in terms of overall sustainability and waste management. The results indicated that M − FW has potential for usability to remove heavy metals like Cu2+ in environmental remediation applications.



中文翻译:

用于去除Cu 2+的新型功能化农业废弃物基吸附剂的制备和表征:使用响应面法评估吸附性能

在本研究中,旨在通过提高农业废弃物亚麻籽废料 (FW) 的表面活性的新型改性方法提高吸附能力,并研究其作为去除Cu 2+的有效吸附剂的可用性. 改性方法包括通过在 N, N-二甲基-甲酰胺、聚(N-乙烯基-吡咯烷酮)和六亚甲基四胺存在下将 FeCl 3添加到培养基中,用铁对 FW 进行功能化。通过常规单变量分析研究参数的影响。此外,基于多变量分析的响应面方法 (RSM) 用于提高 Cu 2+在铁改性亚麻籽废料 (M - FW) 上的吸附性能。铜2+在确定的最佳条件 Co:75 ppm、pH:4.7 和 m:0.23 g 下,仅 15 分钟的平衡时间实现了 91.46% ± 2.34(N = 2)的去除效率。RSM 已成功应用于吸附预测。吸附性质为单层吸附,最大吸附容量 ( Q max ) 为 7.64 mg/g。吸附机制,确定为化学控制,放热和非自发过程。此外,pH 依赖性吸附表明 M − FW 和 Cu 2+之间的静电相互作用离子在吸附机理中起重要作用。表征研究的结果表明,随着结构孔隙率的增加,提供了大的表面积,并且随着修饰在目标功能结构中发生了所需的变化。此外,从整体可持续性和废物管理方面评估了 M - FW 的修改和可重用性。结果表明,M - FW在环境修复应用中具有去除重金属如 Cu 2+ 的潜力。

更新日期:2021-06-13
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