Three natural adsorbents were used in this study to determine the absorption rate of diazinon pollution from water environments: date kernel powder, powdered pine cone, and powdered natural biochar from Kuhbanan mining. The tests were conducted using a batch-series test. To model the diazinon pollutant, various concentrations of each adsorbent were investigated as the primary research parameter. The Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and methylene blue test were used to examine the characteristics of the natural absorbent particles employed in this investigation. The findings demonstrate that each adsorbent has a large specific surface area that is ideal for pollutant absorption, a high porosity and roughness, and a multitude of functional groups on its surface.

Analyzing diazinon pollutant absorption by adsorbents quantitatively involves examining Langmuir and Freundlich isotherms. The outcomes of the batch tests demonstrated that 5 grams of natural biochar powder, with an absorption percentage of 1.65%, and 1 gram of natural biochar powder, with an absorption percentage of 0.1, respectively, had the highest and lowest rates of diazinon pollutant absorption. With an RMSE of 0.04 and an R² of 0.96, the Freundlich isotherm model fits the date kernel powder absorbent data the best out of all the fitted models. In conclusion, the data obtained indicate that natural biochar powder exhibits the highest absorption rate and the highest effectiveness when it comes to eliminating diazinon from water.