The present study investigates the potential of the phosphoric acid-treated Chlorella sorokiniana biomass in the adsorption of chromium ions. The Chlorella sorokiniana species used for acid modification is waste-based biomass generated from biofuel extraction. The biodiesel preparation process utilizes the C. sp grown at in situ conditions in open pond systems. The SEM imaging of the phosphoric acid-treated biomass shows an improved morphology required for the sorption of metal ions. Meanwhile, BET analysis results presented that the acid-treated biomass is macro-porous. Besides, TGA and FTIR studies captured the functional group changes occurred in the chemically modified biomass. Further, the stability of the prepared adsorbent is confirmed in the zeta potential studies. The present study also delves into the study of process parameters on the uptake of metal ions. The result shows an increased uptake efficiency of 89.5% for 100 mg/L chromium solution at a pH of 2. Another key finding in the study is the rapid sorption of metal ions in the first 10 min of contact time. In addition, the isotherm and kinetic studies establish the inclination of the studied system towards Freundlich and pseudo-second-order models, respectively. Thus, the current study unveils the possibility of reusing C. sp waste biomass to remove chromium contaminants from an aqueous solution.

本研究调查了磷酸处理的小球藻小球藻生物量在铬离子吸附中的潜力。所述小球藻sorokiniana用于酸改性物质是生物燃料萃取产生的废物基生物质。生物柴油的制备过程利用C. sp在开放池塘系统中原位生长的。磷酸处理过的生物质的SEM图像显示出吸附金属离子所需的形态改善。同时，BET分析结果表明酸处理过的生物质是大孔的。此外，TGA和FTIR研究捕获了化学修饰生物质中发生的官能团变化。此外，在ζ电势研究中证实了制备的吸附剂的稳定性。本研究还深入研究了有关吸收金属离子的工艺参数。结果表明，在pH为2的情况下，对于100 mg / L的铬溶液，其吸收效率提高了89.5％。该研究的另一个关键发现是在接触时间的前10分钟内金属离子的快速吸附。此外，等温线和动力学研究分别建立了所研究系统对Freundlich模型和伪二阶模型的倾斜度。因此，当前的研究揭示了重用的可能性C.sp浪费生物质以从水溶液中去除铬污染物。