shows the removal percentage of pesticide (25 ml, 0.1 ppm) after 45 min with different amounts of the composite. The experiments were performed by different concentrations of adsorbent, which showed that the removal efficiency increased with an increase in adsorbent concentration up to 0.5 g in 25 ml solution. After a very slow increase in removal percentage, it was found that the increase in adsorbent of more than 0.5 g dose did not affect the removal percentage significantly. 96% removal of pesticide was found in the dosage range of 0.5–1.5 g.This may be presumed that the availability of active sites on the nanocomposite is decreasing at higher doses of sorbents (>0.5 g). The total active surface area increases by increasing composite dosage. At the same time, due to increasing amount of sorbent, the sorbent–sorbent interactions are more dominating than sorbate–sorbent interactions 37 and 38. Since the most effective removal of permethrine was observed with 0.5 g of CS–ZnONPs composite, the other experiments were performed in this concentration.