In this work, α-costic acid (αCA), a plant sesquiterpenoid from Dittrichia viscosa, was grafted into polyaluminum chloride (PAC), forming a new eco-sustainable composite coagulant PAC-αCA with improved functionality. The α-costic acid fraction grafted into the PAC and the distribution of aluminum forms in the composite coagulant were evaluated for their effectiveness in removing bentonite and humic acid from synthetic water. The interaction mechanism between PAC and α-CA was examined by the Al-Ferron time spectrophotometric method, density functional theory (DFT), and FTIR analysis. By monitoring the aluminum speciation in the composite coagulant PAC-αCA, it was discovered that the introduction of α-CA impacted the distribution of various aluminum forms, including mononuclear Ala, highly polymeric Alb, colloidal, and medium polymeric Alc. The theoretical analysis identified the Alb species as particularly sensitive to reacting with α-CA. Furthermore, coagulation performance tests demonstrated that increasing the percentage of α-CA and promoting the prevalence of Alb and Alc species over Ala species in PAC-αCA led to improved removal of turbidity and UV254. This study provides an attractive and practical option for water treatment plants to remove colloidal suspensions in raw water effectively.

中文翻译：

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使用新型无机-有机复合混凝剂：α-木香酸作为聚合氯化铝性能的改性剂来改善腐殖酸（HA）的去除。

在这项工作中，将来自Dittrichia viscosa的植物倍半萜类化合物α-木香酸（αCA）接枝到聚合氯化铝（PAC）中，形成一种具有改进功能的新型生态可持续复合混凝剂PAC-αCA。评估了接枝到 PAC 中的 α-木香酸部分以及复合混凝剂中铝形式的分布，以评估其从合成水中去除膨润土和腐殖酸的有效性。通过 Al-Ferron 时间分光光度法、密度泛函理论 (DFT) 和 FTIR 分析研究了 PAC 和 α-CA 之间的相互作用机制。通过监测复合混凝剂PAC-αCA中铝的形态，发现α-CA的引入影响了各种铝形态的分布，包括单核Ala、高聚合Alb、胶体和中聚合Alc。理论分析确定 Alb 物种对与 α-CA 的反应特别敏感。此外，混凝性能测试表明，增加 α-CA 的百分比并促进 PAC-αCA 中 Alb 和 Alc 物种相对于 Ala 物种的普遍存在，可以改善浊度和 UV254 的去除效果。这项研究为水处理厂有效去除原水中的胶体悬浮物提供了一种有吸引力且实用的选择。