College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China; School of Resources & Environmental Science, Hubei Key Laboratory of Biomass-Resources Chemistry and Environmental Biotechnology, Wuhan University, Wuhan 430079, China.
College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China.
Bioresour Technol. 2024 Feb;394:130287. doi: 10.1016/j.biortech.2023.130287. Epub 2024 Jan 3.
Microalgae biochar is potential adsorbents to remove heavy metals from wastewater due to abundant functional groups, high porosity and wide sources, but performance is not fully developed since it depends on microalgae species attributing to distinct morphology and biomass compositions. Here, two microalgae species Chlorella Pyrenoidosa and Scenedesmus Obliquus were used for biochar preparation via KOH-modification, biochar properties and their influences on Ni(II) adsorption were investigated. Ni(II) adsorption performances responding to biochar properties and operating conditions were upgraded via progressive optimization and response surface methodology. Together, adsorption isotherms and kinetics were analyzed to obtain significant factors for Ni(II) removal. As results, 100 % of Ni(II) removal was achieved under 100 mg/L initial Ni(II) concentration as pH was higher than the biochar zero-charge point of 6.87 with low biochar dosage (0.5 g/L), which provides an efficient approach for heavy metal removal from wastewater with microalgae biochar.
微藻生物炭由于富含官能团、高孔隙率和广泛的来源，是一种潜在的吸附剂，可用于从废水中去除重金属，但由于其性能取决于微藻种类，而微藻种类的形态和生物质组成不同，因此其性能尚未得到充分开发。在这里，使用两种微藻物种——蛋白核小球藻和斜生栅藻，通过 KOH 改性来制备生物炭，研究了生物炭的性质及其对 Ni(II)吸附的影响。通过逐步优化和响应面法，对生物炭性质和操作条件的 Ni(II)吸附性能进行了升级。同时，对吸附等温线和动力学进行了分析，以获得 Ni(II)去除的显著因素。结果表明，在初始 Ni(II)浓度为 100mg/L 以下时，当 pH 高于生物炭零电荷点 6.87 时，Ni(II)去除率达到 100%，且生物炭用量低（0.5g/L），为利用微藻生物炭从废水中去除重金属提供了一种有效的方法。
