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Outline
A novel biodegradable surfactant of sodium N-lauroyl sarcosinate (LS) was used for copper ion flotation. The effects of mass concentration ratio of LS to Cu(Ⅱ)(ρLS:ρCu(Ⅱ)), pH value of solution and flotation time on the flotation effect of copper ion were explored by single factor condition tests, and the flotation conditions were optimized by Box-Behnken response surface method. Finally, the verification test was carried out based on the optimization results. The results of single factor test show that at the best condition with ρLS:ρCu(Ⅱ) of 2.5, pH value of 8, and flotation time of 5 min, the removal rate of Cu(Ⅱ) reaches 97.97%. The verification test results show that the average removal rate of Cu(Ⅱ) in the three verification tests reaches 99.71% at the condition with ρLS:ρCu(Ⅱ) of 2.5, pH of 9, and flotation time of 4 min, which is basically consistent with the prediction results obtained by software fitting. It indicates that the model has a good fitting degree and reliability. The morphology and elemental analysis show that the structure of LS-Cu complex is loose and stable. Compared with LS, the mass concentration of Cu(Ⅱ) in the complex increases from 0.00 to 5.15%, indicating that LS has a good adsorption capacity for Cu(Ⅱ).
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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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