<\/span><\/h2>\n\n\n\nNanobiochar production typically occurs through “green” and energy-saving nanotechnology methods, using raw materials such as agricultural waste (rice husks, peanut shells), animal waste, and municipal waste. The process involves two main phases.<\/p>\n\n\n\n
Phase 1: Preparation of Bulk Biochar (Macro-BC)<\/strong>
The biomass is decomposed through thermochemical processes, such as pyrolysis<\/strong> , at temperatures between 350-700\u00b0C in the absence of oxygen. Slow pyrolysis is an environmentally friendly method that guarantees high product yields.<\/p>\n\n\n\nPhase 2: Nanoscale Reduction<\/strong>
Since direct synthesis produces very low yields (<2.0%), the macro-biochar is reduced in size through two main approaches:<\/p>\n\n\n\n\n- Top-Down Methods:<\/strong>\u00a0These involve “crushing” the material.\u00a0Ball milling<\/strong>\u00a0is one of the most popular methods due to its low cost, reduced energy consumption, and its effectiveness in improving surface area and absorption capacity. Other methods include shearing and centrifugation.<\/li>\n\n\n\n
- Bottom-Up Methods:<\/strong>\u00a0Assemble nanomaterials from the atomic level.\u00a0Sonication<\/strong>\u00a0, for example, uses shock waves to increase microporosity and “exfoliate the carbon backbone.”<\/li>\n<\/ul>\n\n\n\n
Functionalization: Enhancing the Performance of Nano-BC<\/h3>\n\n\n\n
To further improve its performance, nano-BC can be “functionalized.” Processes such as oxidation or engineering with iron oxide (Fe3O4) nanoparticles increase the adsorption sites and the versatility of the material.<\/p>\n\n\n\n