Removal of Heavy Metal Contamination from Peanut Skin Extracts by Waste Biomass Adsorption

Abstract

Peanut skins are a processing waste product with potential as a low‐cost source of polyphenols for nutraceutical or functional food ingredient use. Aqueous extractions of peanut skins and subsequent concentration of these extracts can result in normally innocuous levels of heavy metals present to be increased to concentrations of human health concern. Adsorption utilizing waste biomasses is a promising method of removing these contaminants from extracts. Peanut hulls and chitosan cross‐linked beads were evaluated as possible adsorbents. The Langmuir adsorption model determined that peanut hulls were the more effective material. Peanut hulls removed 88.6 ± 1.9% of the cadmium present. Apparent removal of arsenic (21.7 ± 9.5%) showed no correlation to adsorbent dosage. Successful removal of cadmium without reduction of the phenolic content of the extracts showed that this strategy is effective for heavy metal remediation of peanut skin extracts, making them a viable source of antioxidants in food applications. Practical Applications Polyphenols are a rapidly increasing portion of the nutraceutical and functional food marketplace. Peanut skins are a waste product from the peanut blanching and roasting industry which have potential as a low‐cost source of polyphenols. Extraction and concentration of peanut skin extracts can cause normally innocuous levels of the heavy metal content to be increased to concentrations of concern. Adsorption utilizing waste biomasses is a promising method of removing contaminants from extracts. The present study developed peanut hulls as a possible adsorbent material for the remediation of peanut skin extracts. The results of this study will be useful to peanut growers and shellers to develop new ingredient applications for peanut skin polyphenol extracts.

Choice of Suitable Economic Adsorbents for the Reduction of Heavy Metal Pollution Load

“…Peanut hulls 21.7±9.5% of arsenic and 88.6±1.9% of cadmium removal [66] Peanut husk Ultrasound assisted chemically activated peanut husk shows 19.6 mg/g of copper adsorption [67] under various pyrolysis temperatures (300ºC to 800ºC). The DMB3 (prepared at 300ºC) has shown higher yield and surface oxygen-containing group content as compared to that prepared at higher pyrolysis temperatures (500ºC and 800ºC).…”

Efficacy of Eosin Dye Removal by Peanut Shell Agrowaste Adsorbent

“…Peanut was bought from a local market in Bangkok, Thailand. The preparation of peanut shell agrowaste methodology was modified from Arunlertaree and coauthors [26] and Massie and coauthors [27]. First, the peanut was washed thoroughly with tap water to minimize its chromaticity and remove any dirty.…”

Birnessite-Type MnO2 Modified Sustainable Biomass Fiber toward Adsorption Removal Heavy Metal Ion from Actual River Aquatic Environment

“…Ogata et al reported that a waste biomass adsorbent produced from mangosteen shells (MGS1000) exhibited a good adsorption capacity of 12.0 mg/g for adsorbing cadmium ions from aqueous media . In addition, rice husk, saw dust, corn stalk, peanut skins, and coconut waste were found to be effective in removal of heavy ions. − However, the single biomass adsorbent was commonly limited in practical applications due to its undesirable adsorption capacity, thus the modification treatment was selected to the enhancement of active sites, like surface functional groups and specific surface area. − …”