Aryee Aaron Albert, Dovi Evans, Guo Qiehui, Liu Mingyu, Han Runping, Li Zhaohui, Qu Lingbo
College of Chemistry, Zhengzhou University, No 100 of Kexue Road, Zhengzhou, 450001, People's Republic of China.
Environ Sci Pollut Res Int. 2021 Jul;28(28):37322-37337. doi: 10.1007/s11356-021-13030-5. Epub 2021 Mar 13.
A novel adsorbent (PN-FeO-IDA-Zr) was developed from the chemical modification of peanut husk (a low cost material) with FeO, iminodiacetic acid (IDA) and zirconium (Zr) and its efficacy for the sequestration of wastewater assessed using Alizarin red (AR) and Acid chrome blue K (AK) as model pollutants. To elucidate the characteristics of the formed adsorbent, analytical techniques such as the Bruauner-Emmet-Teller (BET) method, X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffractive spectroscopy (XRD) and vibrating sample magnetometer (VSM) were applied. Results from these studies confirmed the formation of a crystalline mesoporous adsorbent with surface properties which enhanced its usefulness. From the adsorption studies, it was observed that factors such as pH, salts, temperature and contact time influenced the uptake of the anionic dyes. The maximum monolayer capacity of PN-FeO-IDA-Zr for AR was 49.4 mg g (at 313 K) and was well fitted by the Langmuir model with the chemisorption process being the dominant reaction mechanism. In binary systems, PN-FeO-IDA-Zr exhibited higher affinity for AR as compared with AK. The significant removal efficiency exhibited by this novel adsorbent as well as other unique features such as easy retrieval and high regeneration promotes its prospects as an adsorbent for practical wastewater remediation processes.
一种新型吸附剂（PN-FeO-IDA-Zr）是通过用FeO、亚氨基二乙酸（IDA）和锆（Zr）对花生壳（一种低成本材料）进行化学改性而制备的，并且使用茜素红（AR）和酸性铬蓝K（AK）作为模型污染物评估了其对废水的螯合效果。为了阐明所形成吸附剂的特性，应用了诸如布鲁瑙尔-埃米特-泰勒（BET）法、X射线光电子能谱（XPS）、傅里叶变换红外（FTIR）光谱、X射线衍射光谱（XRD）和振动样品磁强计（VSM）等分析技术。这些研究结果证实形成了一种具有增强其用途的表面性质的结晶介孔吸附剂。从吸附研究中观察到，pH值、盐类、温度和接触时间等因素会影响阴离子染料的吸收。PN-FeO-IDA-Zr对AR的最大单层吸附容量为49.4 mg/g（在313 K时），并且与Langmuir模型拟合良好，化学吸附过程是主要的反应机制。在二元体系中，与AK相比，PN-FeO-IDA-Zr对AR表现出更高的亲和力。这种新型吸附剂表现出的显著去除效率以及其他独特特性，如易于回收和高再生性，促进了其作为实际废水修复过程吸附剂的应用前景。
