Comparison of adsorption of biochar from agricultural wastes on methylene blue and Pb2+

Abstract

Biochar was prepared from agricultural plant waste, including corn straw (MS), sunflower straw (SS), wheat straw (WS), orange peel (OS), sunflower seed shell (SSS), and chestnut shell (CS) at low temperature in a partially oxygen-limited environment. These biochars were used to adsorb heavy metals and organic pollutants. The results showed that biochar having suitable surface area and microporous area could be obtained from the raw materials at 300 °C under partial oxygen limitation. The total porosity of biochar prepared from corn straw (MS) was 92.8%, and the removal of Pb2+ was 78.6 mg/g. The obtained biochar had good adsorption properties for methylene blue and Pb2+ water of different concentrations, and the adsorption performance of biochar prepared from crop straw was better than that of biochar prepared from plant peel. Thus, it was feasible to prepare biochar and to adsorb harmful substances in water through this process. This study promotes the recycling of agricultural wastes and simplifies the preparation of carbon adsorbents.

Evaluation and selection of biochars and hydrochars derived from agricultural wastes for the use as adsorbent and energy storage materials

“…This value, 179.7 mg/g, is the highest value of Pb(II) adsorption determined in this study. This value is comparable with those found in the literature for biochars produced from other agricultural wastes, such as rice straw (100-198 mg/g) [88], various biomasses (30-117 mg/g) [89], corn straw (79 mg/g) [90] and hickory (12-17 mg/g) [91]. Further comparison and conditions of the experiments are shown in Table S4.…”

Pb (II) Recovery by Trout Bones: Adsorption, Desorption and Kinetic Study

“…Therefore, adsorbents obtained from natural sources have attracted great interest (Silva-Yumi et al, 2018). There are many heavy metal adsorption studies in the literature, especially with adsorbents obtained from natural sources such as agricultural wastes and their modified forms (Dubey & Gopal, 2007;Bansal et al, 2009;Qiao et al, 2019;Yu et al, 2022), wheat straw (Khan et al, 2021), biochar (Q. Wang et al, 2018;Guan et al, 2022), clay (Xie et al, 2018), tea plant waste (Ibrehem, 2019).…”