Ly Nguyễn Hoàng, Khoa Nguyen Le Minh, Nguyen Nguyen Binh, Huong Vu Thi, Van Duc Bui, Aminabhavi Tejraj M, Vasseghian Yasser, Joo Sang-Woo
Department of Chemistry, Gachon University, Seongnam, 13120, South Korea.
Department of Chemistry, Soongsil University, Seoul, 06978, South Korea.
J Environ Manage. 2023 Dec 15;348:119259. doi: 10.1016/j.jenvman.2023.119259. Epub 2023 Oct 10.
Composites of magnetic biochar derived from spent coffee grounds were prepared using MoS decorated by plasmonic silver nanoparticles (MoS-Ag), which were used for the bioremediation Cr ions. The composites were characterized by electron microscopy, X-ray diffraction, Raman, and UV-VIS spectroscopy. The bioremediation of Cr ions was enhanced almost two times compared to microalgae, Spirulina maxima. Such an increased activity is attributed to heterojunction formation of Biochar@MoS-Ag composite due to the synergetic effects of surface plasmon resonance of AgNPs inducing amplified local electric field, thus simultaneously increasing the absorption of MoS under visible or near-infrared light. The combination of Biochar@MoS-Ag and Spirulina maxima powder was effective for the separation (microalga-based absorption and accumulation of Cr ions) of photo-induced carriers (composite-assisted to breakdown Cr ions). This study offers efficient eco-friendly treatment of Cr ions by reporting the first enhanced bioremediation of Cr(VI) ions by microalgae using MoS-Ag-modified biochar obtained from consumed coffee grounds.
采用等离子体银纳米颗粒修饰的二硫化钼（MoS-Ag）制备了由废弃咖啡渣衍生的磁性生物炭复合材料，并将其用于铬离子的生物修复。通过电子显微镜、X射线衍射、拉曼光谱和紫外可见光谱对复合材料进行了表征。与极大螺旋藻相比，铬离子的生物修复效率提高了近两倍。这种活性的增加归因于Biochar@MoS-Ag复合材料异质结的形成，这是由于AgNPs的表面等离子体共振诱导放大的局部电场的协同效应，从而同时增加了MoS在可见光或近红外光下的吸收。Biochar@MoS-Ag与极大螺旋藻粉末的组合对于光生载流子的分离（基于微藻的铬离子吸收和积累）（复合材料辅助分解铬离子）是有效的。本研究通过报道首次使用从消费咖啡渣中获得的MoS-Ag修饰生物炭增强微藻对Cr(VI)离子的生物修复，提供了一种高效、环保的铬离子处理方法。
