用化学方法修饰库拉索芦荟叶水凝胶，以高效去除高硬度地下水中的镉。
Chemical modification of Aloe vera leaf hydrogel for efficient cadmium-removal from spiked high-hardness groundwater.
机构信息
Institute of Chemistry, University of Sargodha, Sargodha 40100, Pakistan.
Centre for Organic Chemistry, School of Chemistry, University of the Punjab, Lahore 54590, Pakistan.
出版信息
Int J Biol Macromol. 2024 Feb;259(Pt 2):128879. doi: 10.1016/j.ijbiomac.2023.128879. Epub 2023 Dec 23.
Herein, the hydrogel from the leaf of the Aloe vera plant (ALH) was succinylated (SALH) and saponified (NaSALH). The FTIR, solid-state CP/MAS C NMR, and SEM-EDX spectroscopic analyses witnessed the formation of SALH and NaSALH from ALH. The pH for NaSALH was found to be 4.90, indicating the presence of -ve charge on its surface. The Cd sorption efficiency of NaSALH was found to be dependent on pH, NaALH dose, Cd concentration, contact time, and temperature. The maximum Cd removal from DW and HGW was found to be 227.27 and 212.77 mg g according to the Langmuir isothermal model (>0.99) at pH of 6, NaSALH dose of 40 mg g, Cd concentration of 90 mg L, contact time of 30 min, and temperature of 298 K. The kinetic analysis of Cd sorption data witnessed that the Cd removal by chemisorption mechanism and followed pseudo-second-order kinetics (>0.99). The -ve values of ΔG° and ΔH° assessed the spontaneous and exothermic nature of sorption of Cd by NaSALH. The regeneration and sorption/desorption studies indicated that the sorbent NaSALH is regenerable.
本文以库拉索芦荟叶为原料制备了水凝胶，并对其进行琥珀酰化（SALH）和皂化（NaSALH）。傅里叶变换红外光谱（FTIR）、固态 CP/MAS C 核磁共振（C NMR）和扫描电子显微镜-能量色散 X 射线光谱（SEM-EDX）分析表明，ALH 成功转化为 SALH 和 NaSALH。NaSALH 的 pH 值为 4.90，表明其表面带有负电荷。NaSALH 对 Cd 的吸附效率取决于 pH 值、NaSALH 剂量、Cd 浓度、接触时间和温度。根据 Langmuir 等温模型（>0.99），当 pH 值为 6、NaSALH 剂量为 40mg/g、Cd 浓度为 90mg/L、接触时间为 30min、温度为 298K 时，NaSALH 对 DW 和 HGW 中 Cd 的最大去除率分别为 227.27 和 212.77mg/g。Cd 吸附动力学数据表明，Cd 的去除是通过化学吸附机制进行的，符合准二级动力学模型（>0.99）。ΔG°和ΔH°的负值表明 Cd 被 NaSALH 吸附是自发和放热的。NaSALH 的再生和吸附/解吸研究表明，该吸附剂是可重复使用的。
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