Salehin Moghadaseh, Khoshbouy Reza, Fatehifar Esmaeil
Chemical Engineering Faculty, Sahand University of Technology, Tabriz, Iran; Environmental Engineering Research Center, Sahand University of Technology, Tabriz, Iran.
Chemical Engineering Faculty, Sahand University of Technology, Tabriz, Iran; Green Carbon Research Center, Sahand University of Technology, Tabriz, Iran.
Int J Biol Macromol. 2024 Nov;280(Pt 4):136118. doi: 10.1016/j.ijbiomac.2024.136118. Epub 2024 Sep 28.
Recently, biopolymers have been used as coagulants/flocculants due to their biodegradability, low cost, and renewability. In this study, an environmentally friendly amine-functionalized starch-based flocculant was successfully prepared. Initially, β-cyclodextrin was grafted onto the starch backbone to increase the number of hydroxyl groups, and this composite was named CD-starch. Subsequently, in order to introduce cationic properties and enhance effective flocculation, CD-starch was modified using amine functional groups. The surface functional groups were engineered by introducing different amine to CD-starch ratios (0.5:1, 1:1, 2:1 w/w), named A-CD-starch 0.5, 1 and 2, respectively. Following the characterization of the synthesized substrate, its performance in the flocculation process of a kaolin suspension was investigated. The effects of different parameters, including pH, flocculant dosage, and initial turbidity on wastewater turbidity removal, was investigated. The results showed that a higher ratio of amine to CD-starch leads to a better amination reaction due to the greater availability of nitrogen for alkylation. Jar experiments showed that for initial turbidities of 50, 150 and 300 NTU, the appropriate doses of flocculant were 0.070, 0.085 and 0.130 mg/mL, respectively. For these initial turbidities, the maximum turbidity removal was achieved 80.1 %, 92 %, and 97.8 %, respectively. This work provides an innovative natural flocculant based on starch which can effectively treat turbid wastewaters.
近年来，生物聚合物因其可生物降解性、低成本和可再生性而被用作凝聚剂/絮凝剂。在本研究中，成功制备了一种环境友好型胺官能化淀粉基絮凝剂。首先，将β-环糊精接枝到淀粉主链上以增加羟基数量，这种复合材料被命名为CD-淀粉。随后，为了引入阳离子特性并增强有效絮凝效果，使用胺官能团对CD-淀粉进行改性。通过引入不同的胺与CD-淀粉比例（0.5:1、1:1、2:1 w/w）来设计表面官能团，分别命名为A-CD-淀粉0.5、1和2。在对合成的底物进行表征之后，研究了其在高岭土悬浮液絮凝过程中的性能。研究了不同参数，包括pH值、絮凝剂用量和初始浊度对废水浊度去除的影响。结果表明，由于氮用于烷基化的可用性更高，胺与CD-淀粉的比例越高，胺化反应越好。烧杯实验表明，对于初始浊度为50、150和300 NTU的情况，絮凝剂的合适用量分别为0.070、0.085和0.130 mg/mL。对于这些初始浊度，最大浊度去除率分别达到80.1%、92%和97.8%。这项工作提供了一种基于淀粉的创新型天然絮凝剂，可有效处理浑浊废水。
