Nguyen Linh T T, Le Phuong T, Nguyen Tien A, Doan Nhuan N, No Kwangsoo
Department of Chemistry, Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam.
Department of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam.
Environ Sci Pollut Res Int. 2023 Jan;30(1):1898-1907. doi: 10.1007/s11356-022-22356-7. Epub 2022 Aug 4.
Phytoremediation is one of the most powerful and viable solutions for developing countries to clean the soil and water bodies from metallic pollutants. Cyperus alternifolius Linn. (CAL), a tropical wetland plant, has been widely researched for removing harmful contaminants due to its hyperaccumulation ability. However, the waste biomass of phytoremediation processing may risk secondary environmental pollution. Thus, the preparation and application of biochar from metal-contaminated plants can be considered a new approach. In a 60-day experiment, CAL plants were irrigated with different concentrations of Zn(II) (200, 700, 1200, 1700, and 2200 mg·L), and then the plants were converted into biochar via the pyrolysis process. The characteristics of biochar including of surface composition and morphology, phase formation, and optical property were analyzed. The biochar enriched with Zn(II) at 1200 mg·L had a bandgap value of 3.17 eV and consisted of carbon microparticles intermingled with ZnO and SiO nanoparticles. Furthermore, the adsorption and photocatalysis of the biochar were studied in the discolouration of methylene blue (MB), as a test reaction, with the maximum MB removal capacities of 55.2 mg·g. Such results will serve as the basis for new research aiming at the potential for reusing metal-contaminated plants to produce efficient depolluting biochar.
植物修复是发展中国家清除土壤和水体中金属污染物最有效且可行的解决方案之一。风车草（Cyperus alternifolius Linn.，CAL）是一种热带湿地植物，因其超富集能力，在去除有害污染物方面已得到广泛研究。然而，植物修复过程产生的废弃生物质可能存在二次环境污染风险。因此，利用受金属污染的植物制备和应用生物炭可被视为一种新方法。在一项为期60天的实验中，用不同浓度的锌离子（Zn(II)）（200、700、1200、1700和2200毫克·升）灌溉CAL植物，然后通过热解过程将植物转化为生物炭。分析了生物炭的特性，包括表面组成和形态、相形成以及光学性质。锌离子浓度为1200毫克·升时富集锌的生物炭带隙值为3.17电子伏特，由与氧化锌（ZnO）和二氧化硅（SiO）纳米颗粒混合的碳微粒组成。此外，以亚甲基蓝（MB）褪色作为测试反应，研究了生物炭的吸附和光催化性能，其对MB的最大去除容量为55.2毫克·克。这些结果将为旨在研究利用受金属污染的植物生产高效除污生物炭潜力的新研究提供依据。
