School of Environmental and Chemical Engineering, Foshan University, Guangdong, 528000, Foshan, China.
School of Food Science and Technology, Foshan University, Foshan, 528000, China.
Environ Sci Pollut Res Int. 2023 Feb;30(6):16398-16407. doi: 10.1007/s11356-022-23123-4. Epub 2022 Oct 1.
In this study, ferric chloride and sulfuric acid were used to increase the Fe-containing minerals on the biochar surface before a pyrolysis at 600 °C. The pristine and Fe-modified biochars prepared at different concentrations of sulfuric acid (50FBC and 72FBC) were characterized and analyzed, and their capacity of As(V) adsorption under various pH and ionic strength were evaluated. The results showed that the maximum adsorption capacities of As(V) calculated by the Langmuir model for 50FBC and 72FBC are 10.33 and 15.61 mg g, respectively, which are enhanced by 5.0 and 7.8 times compared with the pristine biochar. The higher dosage of HSO (72%) used in the modification leads to a better adsorption capacity of As, especially under neutral to alkaline conditions (7.0 < pH < 10.0). It might result from the increased amounts of Fe-containing minerals formed on the biochar surface, and the enriched functional groups such as phenolic hydroxyl and carboxyl, resulting in the resistance to alkaline conditions. Overall, the Fe-modified biochar, especially 72FBC, had good potential as an environmentally friendly adsorbent for removing As from contaminated water under a wider pH range.
在这项研究中，使用三氯化铁和硫酸来增加生物炭表面的含铁矿物，然后在 600°C 下进行热解。本研究制备了不同浓度硫酸（50FBC 和 72FBC）改性的原始生物炭和铁改性生物炭，并对其进行了表征和分析，评估了它们在不同 pH 值和离子强度下对 As(V)的吸附能力。结果表明，50FBC 和 72FBC 的最大吸附容量分别为 10.33 和 15.61mg/g，通过 Langmuir 模型计算，分别比原始生物炭提高了 5.0 倍和 7.8 倍。在改性过程中使用的较高浓度 HSO（72%）导致对 As 的吸附容量更高，尤其是在中性至碱性条件下（7.0<pH<10.0）。这可能是由于生物炭表面形成的含铁矿物数量增加，以及富含酚羟基和羧基等官能团，从而对碱性条件具有更强的抵抗力。总体而言，铁改性生物炭，特别是 72FBC，作为一种从受污染水中去除 As 的环保吸附剂，在更宽的 pH 范围内具有良好的应用潜力。
