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The study focused on the influence of calcium and magnesium ions (Ca2+ and Mg2+) in karst areas on adsorption behavior between algal organic matter (AOM) of Chlorella sp. and Pseudanabaena sp. and extracellular polymeric substances (EPS) extracted from bacterial cultures were conducted. The adsorption experiments, the fitting of kinetic and isotherm adsorption models, and the analysis of spectroscopic techniques revealed the influence of divalent cations on the biosorption between EPS and AOM. The results showed that in the presence of divalent ions (Ca2+=89.38mg/L, Mg2+=17.59mg/L), the biosorption efficiencies of the EPS were improved by bridging the negatively charged functional groups (which was consistent with adsorption under quasi-secondary kinetics). Among them, the adsorption efficiency of Chlorella AOM increased from 31.57% to 59.99% due to its richer functional group structure, which was significantly higher than that of Pseudanabaena AOM (from 59.59% to 62.77%). 3D-EEM analysis showed that aromatic protein (AP) and soluble microbial product (SMP) fractions dominated the adsorption system, and Ca2+ and Mg2+ altered the stability of fluorescent components during biosorption process. In combination with a specific UV wavelength SUVA254, the adsorption induced an increase in the content of aromatic compounds. The characteristic peak shifts detected by FTIR in the bands of 3300~3600cm-1 (O-H/N-H groups) and 1600~1650cm-1 (C=O groups) revealed that divalent ions combined with related functional groups to form coordinate bonds and caused bridging effects. This study demonstrated that the divalent cations enhanced the adsorption strength of AOM and EPS through charge neutralization and bridging effects.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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