The performance of diphenyldichlorosilane coated ammonium exchange zeolite and its application in the combination of adsorption and biodegradation of hydrocarbon contaminated ground water

Results showed that the ammonium release ability was not significantly influenced by a change in toluene concentration, while the toluene adsorption performance was affected by fluctuations in potassium concentration. The overall ammonium release capacity of the modified zeolite was 0.8 mmol/g, and the toluene adsorption capacity was 9.355 µmol/g without KCl in solution. The Langmuir isotherm fitted the adsorption isotherms well, indicating that the adsorption mechanism of DPDSCI coated ammonium zeolite is the same as that of DPDSCI coated natural zeolite: a monolayer and homogenous surface adsorption process. Regeneration tests showed that this material may be used, cleaned and reused at least three times without a significant reduction in performance.