Taweekarn Tarawee, Wongniramaikul Worawit, Sriprom Wilasinee, Limsakul Wadcharawadee, Choodum Aree
Integrated Science and Technology Research Center, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus, Kathu, Phuket 83120, Thailand.
Polymers (Basel). 2023 Oct 4;15(19):3989. doi: 10.3390/polym15193989.
A continuous-flow system based on a green and cost-effective monolithic starch cryogel column was successfully developed for removing methylene blue (MB). The proposed column exhibited high removal efficiency (up to 99.9%) and adsorption capacity (25.4 mg·g) for synthetic and real samples with an adsorbent cost of USD 0.02. The influence of various operation parameters, including the flow rate, initial concentration, column height, and temperature, on the MB removal efficiency was examined and reported. The MB removal efficiency remained >99% in the presence of potential interferences, highlighting the good performance of the cryogel column. The Yoon-Nelson dynamic model explained the MB adsorption better than the Bohart-Adams model, as indicated by the higher R values (R = 0.9890-0.9999) exhibited by the former and current trends of its parameters. The MB removal efficiency of the cryogel column remained at 62.7% after three reuse cycles. The wastewater containing MB collected from a local batik-production community enterprise in Phuket, Thailand was applied to the proposed continuous-flow system under optimum conditions, and results indicated that 99.7% of the MB present in 2.4 L of wastewater was removed. These results validate the excellent application potential of the cryogel column for the continuous-flow adsorption of MB. This study will facilitate future industrial applications and process designs of the continuous-flow system.
基于绿色且经济高效的整体淀粉冷冻凝胶柱成功开发了一种连续流动系统，用于去除亚甲基蓝（MB）。所提出的柱对合成样品和实际样品表现出高去除效率（高达99.9%）和吸附容量（25.4 mg·g），吸附剂成本为0.02美元。研究并报告了包括流速、初始浓度、柱高和温度在内的各种操作参数对MB去除效率的影响。在存在潜在干扰的情况下，MB去除效率仍保持>99%，突出了冷冻凝胶柱的良好性能。Yoon-Nelson动态模型比Bohart-Adams模型能更好地解释MB吸附，前者显示出更高的R值（R = 0.9890 - 0.9999）及其参数的当前趋势表明了这一点。冷冻凝胶柱在三个重复使用周期后MB去除效率仍保持在62.7%。从泰国普吉岛当地一家蜡染生产社区企业收集的含MB废水在最佳条件下应用于所提出的连续流动系统，结果表明2.4 L废水中99.7%的MB被去除。这些结果验证了冷冻凝胶柱在连续流动吸附MB方面的优异应用潜力。本研究将促进连续流动系统未来的工业应用和工艺设计。
