The results show that the adsorption isotherms of Zn2' and Cd by modified activated carbon are in good www.dxdcarbon.com/product/china-supplier-coconut-shell-activated-carbon-price-per-ton a href="https://www.dxdcarbon.com/product/china-supplier-coconut-shell-activated-carbon-price-per-ton">activated carbon suppliers australiaagreement with the Langmuir and Freundlich adsorption models.
By fitting the kinetic equation of Zn2 adsorption with modified activated carbon, it was found that the first 30min of the adsorption reaction was in line with the Lagergren quasi-first-order reaction, and the second order reaction was in line with the latter.www.coconutactivatedcarbon.com
The adsorption of Cd by modified activated carbon was a Lagergren quasi-first order reaction in the first 20 minutes.
The reaction after adsorption for 20min belongs to the Lagergren quasi-second order reaction.The surface functional group structure and specific surface area of the modified GAC were changed, and the changes of the surface functional group structure and specific surface area of the activated carbon prepared by different modification methods were different.
The specific surface area of activated carbon modified by nitric acid increased from 925.45m'lg to 960.52m2/g, and the number of acid functional groups (carboxyl group, phenolic hydroxyl group) increased from 0.23 mmol/g to 0.36 mmol/g, while the number of acid functional groups and specific surface area of activated carbon modified by reduction decreased.