Full
Outline
The solid waste coal gangue produced in the process of coal mining and washing and the discharge of Pb(Ⅱ) from industrial wastewater will bring great harm to the ecosystem and human health, and it is of great significance to study the efficient removal method of Pb(Ⅱ) and the rational utilization of coal gangue for ecological and environmental protection. A low-cost aminothiol difunctional modified coal gangue (CG-SHNH) composite material was prepared by grafting 3-mercaptopropyl trimethoxysilane (MPTMS) and 3-aminopropyl triethoxysilane (APTES) with coal gangue. The physical and chemical properties of the adsorbed materials were investigated by means of XRD, XRD-EDS, XFR, FTIR, SEM, Zeta potential, and so on. And it is found that new bands appeare at 2 930 cm−1 and 2 560 cm−1, corresponding to C—H and S—H tensile vibrations, respectively, and a new peak appeares at 3 367 cm−1, which is the absorption peak of N—H bonds, indicating that the surface of CG-SHNH is rich in amino and sulfhydryl functional groups. The results of N2 adsorption-desorption analysis indicate that the average pore size of CG-SHNH increases significantly, from 17.33 nm to 24.54 nm. The study on the adsorption performance of CG-SHNH for Pb(Ⅱ) shows that the optimal adsorption capacity of CG-SHNH for Pb(Ⅱ) is 125 mg/g when the addition amount of CG-SHNH is 1 g/L, the contact time is 20 h, the temperature is 25 ℃, the pH is 6.6, and the initial concentration of Pb(Ⅱ) is 600 mg/L. The adsorption mechanism shows that CG-SHNH amino and sulfhydryl bifunctional groups can synergistically promote the chelation adsorption of Pb(Ⅱ), exhibiting excellent heavy metal ion adsorption ability.
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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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