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Outline
To compare their capture efficiency, four types of iron (hydro)oxide-loaded biochar functionalized with ferrihydrite, goethite, hematite, or magnetite were synthesized via co-precipitation method at a consistent iron-to-biochar mass ratio. The modification significantly improved electrostatic attraction between the biochar and aged microplastics, thereby increasing retention capacity. Among these materials, magnetite-loaded biochar demonstrated the highest removal efficiency exceeding 90% and maximum adsorption capacity of 25.02mg/g, representing a 5.53-fold improvement over unmodified biochar. This superior performance is likely attributed to its highest iron oxide loading (4.15wt%). Adsorption data followed both the Langmuir monolayer model and pseudo-first order kinetics. Notably, magnetite-loaded biochar maintained over 95% retention under varying ionic strengths, cation valences, and pH conditions. It also preserved greater than 90% of microplastics in multi-bed volume tests and real-water samples. Moreover, after multiple alkaline washing regeneration cycles, the material remained stable adsorption performance, demonstrating its excellent reusability potential.
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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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