Lin Huan-Cheng, Liu Yi-Ju, Yao Da-Jeng
Department of Power Mechanical Engineering, National Tsing Huiversity, Hsinchu, Taiwan.
Food Industry Research and Development Institute, Hsinchu, Taiwan.
Heliyon. 2024 Sep 5;10(18):e37445. doi: 10.1016/j.heliyon.2024.e37445. eCollection 2024 Sep 30.
Hexavalent chromium Cr(VI) and divalent Copper Cu(II) ions were heavy metals that were severely toxic to organisms and aquatic ecosystems. Algae is considered as an eco-friendly and cost-effective method for heavy metal ions treatment, but there are still some disadvantages to be improved. Therefore, In this paper, we combine microalgae biomass with ferric oxide magnetic nanoparticles (MNPs) to prepare a more widely applicable adsorbent. Box-Behnken design (BBD) was evaluated for exploring the significant parameters for maximum adsorption in a binary Cr(VI) and Cu(II) solution using our synthesized MNPs@Algae (M@A) adsorbent and constructed a predictability of 88.84 and 95.6 % quadratic regression model, through ANOVA, Pareto Chart of the standardized effects, Three-dimensional surface plot, desirability function to analysis and discussion each factor further. The combined results from UV-Vis, FTIR, TGA, and SQUID measurements confirmed the successful synthesis and accurate properties of the MNPs@Algae composites. The experiment results indicated that when initial pH 6, 5 mg/L Cr(VI), 20 mg/L Cu(II), M@A(3 : 3), dose (1 g/L), and contact time 6 h can achieve the maximum 58 % Cr(VI) and 73.4 % Cu(II) removal efficiency. M@A can eliminate Cr(VI) and Cu(II) from binary solution and separate them from the solution within a few seconds by a permanent magnet as a feasible and efficient absorbent.
六价铬Cr(VI)和二价铜Cu(II)离子是对生物体和水生生态系统具有严重毒性的重金属。藻类被认为是一种环保且经济高效的重金属离子处理方法，但仍存在一些有待改进的缺点。因此，在本文中，我们将微藻生物质与氧化铁磁性纳米颗粒（MNPs）相结合，制备出一种适用性更广的吸附剂。采用Box-Behnken设计（BBD）来探索使用我们合成的MNPs@Algae（M@A）吸附剂在二元Cr(VI)和Cu(II)溶液中实现最大吸附的显著参数，并通过方差分析、标准化效应的帕累托图、三维表面图、期望函数对各因素进行进一步的分析和讨论，构建了预测性分别为88.84%和95.6%的二次回归模型。紫外可见光谱、傅里叶变换红外光谱、热重分析和超导量子干涉仪测量的综合结果证实了MNPs@Algae复合材料的成功合成及其准确的性质。实验结果表明，当初始pH值为6、Cr(VI)浓度为5 mg/L、Cu(II)浓度为20 mg/L、M@A比例为(3 : 3)、剂量为(1 g/L)且接触时间为6 h时，Cr(VI)和Cu(II)的去除效率可分别达到最大值58%和73.4%。M@A作为一种可行且高效的吸附剂，能够从二元溶液中去除Cr(VI)和Cu(II)，并在几秒钟内通过永久磁铁将它们从溶液中分离出来。
