Study on the Adsorption Properties of Modified Attapulgite for Petroleum Hydrocarbon Contaminants in the Petroleum Hydrocarbon Contaminated Wastewater

Abstract

In view of the current increasingly serious problem of petroleum hydrocarbon pollution in water bodies and the lack of effective pollution control technology, the attapulgite is used as the adsorption medium in this study. Firstly, a series of laboratory experiments (roasting, Acidic, and organic modification) are designed to investigate the performance difference to adsorb the petroleum hydrocarbon pollutants on the basis of its purification, then modified b, the optimal modification and adsorption conditions and kinetic characteristics were studied in order to provide a certain new for the effective removal of petroleum hydrocarbon pollutants in water. Materials, new methods and development of new pollution control technologies. The experimental results of adsorption performance of adsorption media show that the adsorption performance of attapulgite original soil on petroleum hydrocarbon pollutants in water is better than that of common water, such as activated carbon, artificial zeolite, iron powder, corn stover and chitosan. Then, on the basis of the purification of the attapulgite original soil, the purified attapulgite was subjected to hydrochloric acid acidification modification, octadecyltrimethylammonium chloride organic modification experiment and its petroleum hydrocarbon pollutants before and after modification. A comprehensive study of the changes in adsorption performance and microscopic pore changes. Finally, the optimal modification method of modified attapulgite was determined and the microscopic mechanism and optimal adsorption conditions and adsorption kinetics of the modified petroleum hydrocarbon pollutants were studied. Research indicates: (1) The attapulgite modified by acidification of hydrochloric acid and octadecyltrimethylammonium chloride has a significant improvement on the adsorption performance of petroleum hydrocarbon pollutants. (2) Batch and orthogonal experiments show that the optimal adsorption conditions of modified attapulgite for petroleum hydrocarbon pollutants are: treatment time 80min, attapulgite dosage 0.3g ⁄ 100mL, pH 7. Reaction temperature 40 ° C (3) Acidification of hydrochloric acid and organic modification of octadecyltrimethylammonium chloride The attapulgite adsorption behavior of petroleum hydrocarbons in wastewater is subject to quasi-secondary kinetics. Keywords—attapulgite; petroleum hydrocarbon contaminated groundwater; adsorption; modification