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Nitrate wastewater was considered a potential threat to human health and the ecological environment. The adsorption method was regarded as promising for nitrate removal due to its high efficiency and low cost. The interlayer spacing characteristics of layered metal hydroxides were found to be favorable for nitrate adsorption. Nickel-iron layered double hydroxides (NiFe LDHs) was prepared by coprecipitation-hydrothermal method. The optimal preparation conditions were determined through orthogonal experiments as follows: nickel-to-iron molar ratio of 4:1, hydrothermal time of 12hours, and hydrothermal temperature of 1201C. The adsorption capacity of NiFe LDHs for nitrate can reach 37.48mg/g. The adsorption kinetics curve conforms to the quasi second order kinetic equation, and the adsorption process conforms to the Langmuir model. The predicted maximum adsorption capacity is 38.88mg/g. High nitrate adsorption efficiency was maintained by NiFe LDHs within the pH range of 3~10, and a considerable nitrate adsorption capacity was observed even in the presence of high concentrations of coexisting anions, with HCO3- identified as having the most significant impact. The optimal desorption of the adsorbent was achieved using 0.1mol/L NaCl solution, and after five consecutive adsorption-desorption cycles, a nitrate removal rate of 87.1% was retained. Characterization results indicated that the layered structure of NiFe LDHs was essentially maintained before and after adsorption, and the primary adsorption mechanisms were determined to be electrostatic attraction, surface complexation, and ion exchange.
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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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