Effects of surface modification on heavy metal adsorption performance and stability of peanut shell and its extracts of cellulose, lignin, and hemicellulose

Abstract

Effects of surface modification by carboxyl group on Pb 2+ adsorption performances and stability of peanut shell and its extracts (cellulose, lignin, and hemicellulose) were investigated. Stability of the biosorbents was measured by determining organic compound release amount (TOC). Results showed that adsorption capacity of peanut shell and the extract was poor and stability of them was not good enough. Amount of organic compound released from the unmodified sorbents followed the order: cellulose > lignin > peanut shell > hemicellulose. Hemicellulose was the main organic compound release resource for the raw peanut shell. Due to the poor stability of the raw materials, peanut and its extract could not be used directly in the practical waste water treatment. After modification, adsorption capacity of peanut shell, cellulose, lignin, and hemicellulose increased by 4-to 6-folds. Stability of the modified sorbents also increased significantly, and TOC determined for the modified peanut shell, cellulose, and hemicellulose was lower than 4.0 mg L −1 in the optimum pH range from 4.0 to 6.0 even using for 30 days, which was lower than the drinking water standard in China. Modified peanut shell and its extract except for lignin could be used safely in pH ranged from 4.0 to 6.0. Surface modification could improve the adsorption performances and stability of the biosorbents.

Variations in the Phytoremediation Efficiency of Metal-polluted Water with Salvinia biloba: Prospects and Toxicological Impacts

“…Moreover, metals penetrate plants mainly through the root system where most of these ions are bound to the cell wall. Therefore, the polysaccharides cellulose, lignin, and hemicellulose play an essential role in the complexation of metals [36,37]. Metal sequestration by cysteine-and glutamic acid-rich peptides such as glutathione, phytochelatins, and metallothioneins are some of the best well-known mechanisms of metal detoxification in plants.…”

Characterization of the Structure and Physicochemical Properties of Soluble Dietary Fiber from Peanut Shells Prepared by Pulsed Electric Fields with Three-Phase Partitioning

“…The interaction between NO 2 − and tertiary amines as well as secondary amines can lead to the conversion of nitrosamines in the stomach [4]. Additionally, it was indicated that NO 2 − plays a significant role in scavenging toxic and harmful substances in the human body, particularly in the stomach, thereby providing a certain level of protection to human health [25].…”

“…Additionally, it contains beneficial medicinal compounds such as β-sitosterol, saponin, and xylose [3]. It was reported that peanut shells (PSs) possess a significant cellulose content that holds considerable economic worth [4]. Previous studies have primarily concentrated on the utilization of the PS as a material [5,6] and biomass source [7], neglecting its potential as a valuable dietary fiber.…”

A clean and efficient method for purifying crude selenium based on a selective leaching - directed decomposition purification process

“…The calibration of the binding energy scale was done by taking the reference of the C1s peak at 284.8 eV. As shown in figure 2(b), six peaks (Pb 4f 7/2 of 136.56, 138.01, 139.35 and Pb 4f 5/2 of 141.42, 142.87, 144.25) were deconvoluted from the Pb 4f XPS band, which were ascribed to Pb, PbO, and Pb 2+ respectively [30][31][32]. For the XPS analysis results of Se, the Se 3d 5/2 peak is decomposed to three peaks at 54.78, 55.64 and 54.05 eV, corresponding to for Se and PbSe, respectively [33,34].…”