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利用光散射技术研究了Zn2+吸附所引发的腐殖质分子凝聚的动力学及凝聚形成的聚合体的结构特征.结果表明:①腐殖质凝聚过程中光强随时间的变化可以反映凝聚体受到的布朗力与重力得相对强度的动态变化.②随电解质浓度的增加,腐殖质的凝聚速度显著增加,所以本实验中腐殖质的凝聚机制为反应控制团簇凝聚机制,即RLCA机制.③腐殖质凝聚体的分形维数随电解质浓度的增加而逐渐下降,说明随电解质浓度的增加,形成的腐殖质凝聚体的结构越疏松,结构中孔隙的开放度越大.同时,本实验再次证明,天然腐殖质单体分子的平均有效粒径的确位于100～300 nm之间.
The kinetics of agglomeration of humic substances induced by Zn2 + adsorption and the structural characteristics of aggregates were studied by light scattering technique. The results show that: (1) The change of light intensity with time can reflect the Brownian force and The dynamic change of the relative intensity of gravitational force.②The humus aggregation rate increases significantly with the increase of the electrolyte concentration, so the mechanism of aggregation of the humus in this experiment is the RLCA mechanism.③The fractal dimension of the humic aggregates With the increase of electrolyte concentration, the decrease gradually, indicating that with the increase of electrolyte concentration, the more loose the structure of the formed humic aggregates, the greater the openness of the pores in the structure.At the same time, this experiment proved once again that the average effective humic monomer molecules The particle size is indeed between 100 and 300 nm.