Abstract: EDA-DCDF, a modified decolorizing flocculant is synthesized by using dicyandiamide and formaldehyde as raw materials, and ethylenediamine as the modifying agent.The structure and morphological characteristics of EDA-DCDF are characterized by means of SEM, XRD and FT-IR.The influences of the molar ratio between raw materials, flocculant dosage, pH of initial wastewater, inorganic salts and surfactant on the decolorating ability of EDA-DCDF to dyestuffs are systematically investigated.According to experimental results, EDA-DCDF shows an amorphous structure, and exhibits higher decolorization efficiency compared to the unmodified DCDF.The decolorization rate of EDA-DCDF to reactive red 195 can reach 98.7%, apparently higher than that of DCDF.Under acidic to weak alkaline condition, EDA-DCDF can bring about high decolorization efficiency.Different impacts of inorganic salts and surfactant on the decolorization efficiency of EDA-DCDF are found.In the experimental concentration range, EDA-DCDF exhibits good resistance to inorganic salts, while surfactant SDBS affects adversely the decolorization performance of EDA-DCDF.
卢素敏, 宋美华, 王汉昌, 尹良珂, 李献朋. 乙二胺改性双氰胺甲醛脱色絮凝剂的合成及脱色性能研究[J]. 现代化工, 2021, 41(12): 193-197.
LU Su-min, SONG Mei-hua, WANG Han-chang, YIN Liang-ke, LI Xian-peng. Preparation of ethylenediamine modified dicyandiamide-formaldehyde decolorizing flocculant and study on its decolorization performance. Modern Chemical Industry, 2021, 41(12): 193-197.
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