Full
LI Mingzhe (1995-), male, Master candidate. E-mail: 13240007661@163.com
Outline
Si-Ca porous mineral material was prepared with calcine diatomite and slaked lime via a hydrothermal reaction method. The microstructure of diatomite under lime-containing hydrothermal conditions was characterized. The effect of microstructure change of diatomite on its adsorption performance was investigated with methylene blue as an adsorbent, and the mechanism of Si-Ca porous mineral material was analyzed. The results show that SiO2 in calcined diatomite reacts with Ca(OH)2 to generate clinotobermorite under the lime-containing hydrothermal conditions. The diatoms disk structure disappears and the flaky clinotobermorite stacks up into Si-Ca porous mineral. The volume of porous material is 10 times greater than that of calcined diatomite, and the amount of hydroxyl on the surface of the material increases. Si-Ca porous mineral material exhibits good methylene blue adsorption and recycling performance. The adsorption capacity of Si-Ca porous mineral is 6.5 times greater than that of calcined diatomite, and its saturated adsorption capacity can reach 384.51 mg/g. The adsorption process of diatomite board towards methylene blue can be described by the pseudo-second-order kinetic model. Its adsorption isotherms can be fitted by the Langmuir model, and the adsorption is a spontaneous endothermic process. When pH value>4, the surface of Si-Ca porous mineral is negatively charged, the adsorption is completed by the active hydroxyl group of the mineral surface and the quaternary ammonium salt cationic in the solution form the hydrogen bond through electrostatic attraction, Also, the large specific surface area of Si-Ca porous mineral can provide the more adsorption sites for methylene blue, which is conducive to the adsorption.
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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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