Abstract:

Biochemical fulvic (BFA) was degraded by hydrogen peroxide (H₂O₂) before it compounded with calcium salts to be the snow-melting agent. The effect of H₂O₂ concentration, temperature and pH on the freezing point of BFA compound was studied, and its snow-melting mechanism was analyzed by UV, FTIR and GPC. The optimal conditions in degradation were as follows:ratio of H₂O₂ to BFA was 1.5 ml/g, temperature 35℃ and pH 7.5, at which BFA had been degraded for 120 min and the freezing point of BFA compound reduced by about 27%. The results showed that H₂O₂ resulted in the ring opening of some complex aromatic hydrocarbon and oxidation of some unsaturated aliphatic hydrocarbons to produce lots of small-molecular carboxylic acid, alcohol, phenol and alkene arose, which formed some copolymer under Ca²⁺ complexation. They played the dominant role in ice or snow melting. The experiment results indicated that it was key in improving the property of BFA snow-melting agent and increasing the hydrophilic functional groups of carboxy (-COOH), hydroxyl (-OH) and phenolic hydroxyl (ph-OH) in BFA.

Key words: snow-melting agent, biochemical fulvic, hydrogen peroxide, degradation, performance of melting ice

摘要：

针对H₂O₂预氧化对生化黄腐酸（BFA）钙盐复合物的融雪化冰性能影响及其机理进行了研究。结果表明，在H₂O₂与BFA质量比为1.5、pH 7.5、35℃的最佳预降解条件下反应120 min，可使BFA钙盐复合物的冰点降低27%。紫外光谱、红外光谱及凝胶色谱分析结果表明，BFA经H₂O₂氧化降解后，一些复杂的芳香族有机物发生降解甚至开环、不饱和脂肪烃被氧化，产生了大量小分子羧酸、醇、酚及烯烃等有机物。它们在Ca²⁺的络合作用下形成了小分子聚合物或共聚物，在融雪化冰中起主要作用。增加BFA结构中的-COOH、-OH和ph-OH等亲水性基团含量是提高BFA钙盐复合融雪剂性能的关键。

关键词: 融雪剂, 生化黄腐酸, H₂O₂, 降解, 融雪化冰性能