Sequestration of Pb2+ from aqueous solution using bio-based-alkaline modified sorbent from waste Irvingia gabonensis seed husk

IF 1.6 Q3 WATER RESOURCES Water Practice and Technology Pub Date : 2023-10-21 DOI:10.2166/wpt.2023.170
Hillary Onyeka Abugu, Ogechi L. Alum, Janefrances N. Ihedioha, Arinze L. Ezugwu, Ifeanyi A. Ucheana, Ibeabuchi J. Ali, Samson I. Eze
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Abstract

Abstract The unmodified and modified Irvingia gabonensis (IG) were characterized with Fourier transform infrared (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), thermogravimetric analyzer (TGA), and scanning electron microscope (SEM). The experimental conditions revealed the optimum adsorption efficiency was achieved at pH 6 within 30 min. FTIR spectra showed an observable shift in peaks attributed to the pretreatment with NaOH that necessitated the breakdown of the organic compounds. It was established from the SEM image under different magnifications that the surface morphology of the biosorbent consists of heterogeneous layers and pore cavities which acted as potential sites for Pb2+ adsorption. However, there was a considerable increase in the BET surface area, pore size, and pore width on the modified biosorbent compared to the unmodified biosorbent though this did not translate into higher adsorption capacity. The experimental data were best fitted with the Temkim isotherm model suggesting heterogeneous uptake of Pb2+ onto the base-modified Irvingia gabonensis seed husk. The maximum adsorption capacity was 2.58 mg/g and the kinetic model is best described with the pseudo-second-order reaction suggesting a chemical adsorption mechanism. The two error functions (HYBRID and MPSD) suggested the pseudo-second-order reaction mechanism in the adsorption of Pb2+ onto the base-modified Irvingia gabonensis.
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用生物基碱性改性吸附剂对废加蓬树壳中Pb2+的吸附研究
摘要采用傅里叶变换红外(FTIR)、x射线衍射(XRD)、布鲁诺尔-埃米特-泰勒(BET)、热重分析仪(TGA)和扫描电镜(SEM)对未修饰和修饰的加蓬山杉(IG)进行了表征。实验条件表明,在pH为6的条件下,30 min内达到最佳吸附效率。FTIR光谱显示,由于NaOH预处理导致有机化合物的分解,可见峰的移位。从不同放大倍数下的扫描电镜图像可以看出,生物吸附剂的表面形貌由非均匀层和孔洞组成,孔洞是Pb2+吸附的潜在位点。然而,与未改性的生物吸附剂相比,改性后的生物吸附剂的BET表面积、孔径和孔径都有较大的增加,但这并没有转化为更高的吸附能力。实验数据最符合Temkim等温线模型,表明Pb2+在碱基修饰的加蓬树种子壳上的异质吸收。最大吸附量为2.58 mg/g,动力学模型用拟二级反应描述,表明吸附机理为化学吸附。两个误差函数(HYBRID和MPSD)表明,碱基修饰的加蓬树吸附Pb2+的准二级反应机制。
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来源期刊
CiteScore
2.30
自引率
6.20%
发文量
136
审稿时长
14 weeks
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