通过批量和固定床研究增强香根草生物炭对金属离子的吸附。
Enhanced adsorption of metal ions onto Vetiveria zizanioides biochar via batch and fixed bed studies.
机构信息
University School of Chemical Technology, Guru Gobind Singh Indraprastha University, India.
出版信息
Bioresour Technol. 2022 Feb;345:126475. doi: 10.1016/j.biortech.2021.126475. Epub 2021 Dec 2.
The study highlights the potential of Vetiveria Zizanioides derived biochar for heavy metal removal in multicomponent systems. Biochar efficiency varies with pH, metal ion concentration and residence time. Maximum removal efficiency was found to be 66.34, 67.23, 46.54, 69.92, 68.23 and 63.34% for Arsenic, Copper, Nickel, Cadmium, Lead and Chromium at 90 min respectively. Ternary system revealed that Copper ions have inhibitory effect on Lead ions and have lower adsorption capacity than binary system. Multicomponent isotherm model was used to analyse simultaneous adsorption of metal ions and shows a good fit with modified Langmuir model for binary and ternary systems. Fixed-bed column was tested for scale-up feasibility and maximum adsorption capacity of 139, 130, and 123 mg/g for Lead, Copper, and Nickel ions were obtained at 1.5 L/h and a bed height of 12 cm. In fixed bed column, multicomponent sequence provides more protection against premature exhaustion of biochar.
该研究强调了香根草衍生生物炭在多组分体系中去除重金属的潜力。生物炭的效率随 pH 值、金属离子浓度和停留时间而变化。在 90 分钟时，砷、铜、镍、镉、铅和铬的最大去除效率分别为 66.34%、67.23%、46.54%、69.92%、68.23%和 63.34%。三元体系表明，铜离子对铅离子有抑制作用，吸附容量比二元体系低。采用多组分吸附等温模型分析了金属离子的同时吸附，结果表明，该模型对二元和三元体系的拟合度较好，符合修正朗缪尔模型。固定床柱用于放大可行性研究，在 1.5 L/h 和床高为 12 cm 的条件下，铅、铜和镍离子的最大吸附容量分别为 139、130 和 123 mg/g。在固定床柱中，多组分序列对生物炭过早耗尽提供了更多的保护。
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