Department of Environmental Engineering, Faculty of Civil Engineering, Babol Noshirvani University of Technology, P.O. Box: 47148-873113, Babol, Iran.
Department of Civil and Environmental Engineering, Seoul National University, P.O. Box:151-744, Seoul, South Korea.
Environ Res. 2024 Dec 1;262(Pt 2):119966. doi: 10.1016/j.envres.2024.119966. Epub 2024 Sep 12.
The removal of dyes from industrial wastewater is one of the most environmental challenges that should be addressed through sustainable technologies. In this study, a novel green and cost-effective granular from bentonite and bio-wastes of sawdust and corncob (GBSC) was prepared for sustainable treatment of acid orange 7 (AO7) dye wastewater. The d-optimal mixture method was employed to determine the optimum combination of the GBSC in terms of dye adsorption and structure stability. Characterizations of the GBSC were investigated using SEM, XRD, FTIR and BET analyses and compared with bentonite powder (BP), modified bentonite powder (MBP), and granular modified bentonite (GMB). According to the results, a mixture of bentonite 60 wt%, sawdust 20 wt% and corncob 20 wt% at 550 °C yielded the optimal combination of the GBSC which resulted to the highest adsorption capacity 135.22 mg/g, the lowest mass loss 3.1% and maximum crushing strength 12.275 N. The kinetic and isotherm of the adsorption data were fitted well by the pseudo-second-order model and Langmuir isotherm. Our finding suggested a green circular economy model by utilizing agriculture wastes (sawdust and corncob) to synthesize GBSC for sustainable dye wastewater treatment, which offers a cost-effective adsorbent (0.907 $/g) with high regeneration (4 times reusability with 40.5% removal rate) to keep them in circulation for as long as possible.
从工业废水中去除染料是最具环境挑战性的问题之一，应通过可持续技术来解决。在这项研究中，我们制备了一种新型的绿色且经济高效的膨润土和木屑及玉米芯生物废料（GBSC）颗粒，用于可持续处理酸性橙 7（AO7）染料废水。采用 d-最优混合方法确定了 GBSC 在染料吸附和结构稳定性方面的最佳组合。通过 SEM、XRD、FTIR 和 BET 分析对 GBSC 进行了表征，并与膨润土粉末（BP）、改性膨润土粉末（MBP）和颗粒改性膨润土（GMB）进行了比较。结果表明，在 550°C 下，膨润土 60wt%、木屑 20wt%和玉米芯 20wt%的混合物为 GBSC 的最佳组合，其吸附容量最高为 135.22mg/g，质量损失最低为 3.1%，最大破碎强度为 12.275N。吸附数据的动力学和等温线很好地符合准二级模型和 Langmuir 等温线。我们的研究结果提出了一种绿色循环经济模型，利用农业废弃物（木屑和玉米芯）合成 GBSC，用于可持续处理染料废水，提供了一种具有成本效益的吸附剂（0.907 美元/g），可进行 4 次重复使用，去除率为 40.5%，以尽可能长时间地保持它们的循环利用。
