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.
[1] Huang X,Wan Y,Shi B Y,et al.Characterization and application of poly-ferric-titanium-silicate-sulfate in disperse and reactive dye wastewaters treatment[J].Chemosphere,2020,249:126129. [2] Talaiekhozani A,Mosayebi M R,Fulazzaky M A,et al.Combination of TiO2 microreactor and electroflotation for organic pollutant removal from textile dyeing industry wastewater[J].Alexandria Engineering Journal,2020,59(2):549-563. [3] Zhang G W,Okajimab I,Sako T.Decomposition and decoloration of dyeing wastewater byhydrothermal oxidation[J].The Journal of Supercritical Fluids,2016,112:136-142. [4] Verma A K,Dash R R,Bhunia P.A review on chemical coagulation/flocculation technologies for removal of colour from textile wastewaters[J].Journal of Environmental Management,2012,93(1):154-168. [5] Joo D J,Shin W S,Choi J H,Choi S J,et al.Decolorization of reactive dyes using inorganic coagulants and synthetic polymer[J].Dyes and Pigments,2007,73(1):59-64. [6] Lal K,Garg A.Effectiveness of synthesized aluminum and iron based inorganic polymer coagulants for pulping wastewater treatment[J].Journal of Environmental Chemical Engineering,2019,7(5):103204. [7] Yang S,Li W,Zhang H J,Wen Y B,et al.Treatment of paper mill wastewater using a composite inorganic coagulant prepared from steel mill waste pickling liquor[J].Separation and Purification Technology,2019,209:238-245. [8] Cao B,Gao B,Wang M,et al.Floc properties of polyaluminum ferric chloride in water treatment:the effect of Al/Fe molar ratio and basicity[J].Journal of Colloid and Interface Science,2015,458:247-254. [9] 张文艺,刘明元,罗鑫,等.双氰胺甲醛聚合物阳离子印染废水脱色剂的合成及其应用[J].过程工程学报,2010,10(6):1217-1221. [10] Chai S L,John R,Mei F C.A review on application of flocculants in wastewater treatment[J].Process Safety and Environmental Protection,2014,92(6):489-508. [11] 耿仁勇,吕雪川,李国轲,等.双氰胺甲醛改性脱色剂的合成及在模拟染料废水中的应用[J].化工进展,2016,35(1):308-313. [12] 陆雪良.阳离子淀粉改性双氰胺-甲醛絮凝剂的合成及其应用研究[D].苏州:苏州大学,2004. [13] 耿仁勇,吕雪川,李国轲,等.双氰胺甲醛型改性脱色絮凝剂的合成、表征及脱色性能[J].环境科学学报,2016,36(10):3752-3758. [14] 田习菲.醚化改性双氰胺-甲醛脱色絮凝剂的合成及应用[D].苏州:苏州大学,2014. [15] 钱玲,吕功煊.不同方法改性的双氰胺-甲醛絮凝剂脱色性能研究[J].工业水处理,2008,28(7):64-66. [16] 张恒,王晓平,胡振华.双氰胺甲醛缩聚反应机理和强放热现象研究[J].能源化工,2014,35(6):48-52. [17] 黎载波.双氰胺-甲醛絮凝脱色剂的合成与应用研究[D].广州:广东工业大学,2014. [18] Zhou L,Zhou H J,Yang X Y.Preparation and performance of a novel starch-based inorganic/organic composite coagulant for textile wastewater treatment[J].Separation and Purification Technology,2019,210:93-99.
