Studies On The Adsorption Of Phenol And Cd²⁺ On Amphoteric-Cationic Modified Soil

As the development of human life and production, organics, heavy metal pollution has become the main form of environmental pollution in Soil environment. Now through the clay minerals or modified to remove pollutants soil, has become one of the most important methods. use the single cationic surfactant modified soil or clay minerals ,can increase the fixed and modified of organic pollutants, but for heavy metal cation adsorption ability has declined ,and unable to achieve the purpose of both the heavy metal pollution and organics control . But the amphoteric surfactant has the modified ability of heavy metals and organic adsorption , it will be formed with amphoteric-cationic modified soil can achieve what kind of repairing effect on organics and heavy metal , not yet reported at present. The main research results are as follows:1.The dynamics of phenol experiment showed that with the amphoteric surfactant(BS-12) and cationic surfactant(CTMAB) complex modified soil increased the adsorption of phenol, the overall performance showed the rapid reaction and slow reaction of adsorption stage, the overall adsorption speed depended on quick response phase. Any of various surfactant BS or CT increased, would raised the speed of phenol. The temperature increased adsorption of phenol with increasing negative effect. Elovich dynamics model was the optimal model to described the adsorption of phenol. Fitting parameters of A and B value could be used to describe the size of the adsorption.2.The equilibrium adsorption of phenol experiment showed that through the amphoteric surfactant(BS-12) and cationic surfactant(CTMAB) with a single phenol and phenol+ Cd2+ composite pollution in the adsorption of phenol were higher than the original without modification and the single BS modified soil. Two temperature after two surface modifier with complex modified for the biggest adsorption of single phenol, the former is 50BS 11.25 times, is the 100 BS 2.14 times. Cd2+ + phenol complex conditions, after two surface modifier with complex modified for the biggest adsorption of single phenol, 50BS about 10 times, is 100BS of 2.35 times. Increase the proportion of modification BS or CT, would make the adsorption of phenol raise. The temperature effect on the adsorption of phenol was little. The thermodynamic characteristics of phenol is the process of entropy,its being controled by spontaneous process. The adsorption isotherm was described by Henry model.3.The dynamics of heavy metal Cd2+ research showed that through the amphoteric surfactant(BS-12) and cationic surfactant(CTMAB) complex modified soil increased the speed of the Cd2+ . The dynamic response Cd2+ mainly for electrical gravity adsorption, depended on the rapid reaction and slow reaction in two stages. To increase the proportion of BS modification could promote the parameters of Cd2+, CT was to inhibit the speed of each parameter Cd2+. Double constant model is the optimal model to described the soil sample adsorption Cd2+. Fitting parameters of A and B value could be used to describe the size of the adsorption.4.The equilibrium adsorption of Cd2+ experiments showed that through amphoteric surfactant(BS-12) and cationic surfactant(CTMAB) increased the Cd2+ adsorption ability significantly, its adsorption were higher than without modification except for 20℃Cd2++ phenol (100BS+50CT,50BS+50CT and 50BS) three complex modification. To increase the proportion of BS modification could promote the adsorption of Cd2+, CT had the inhabitation to adsorption of Cd2+. Cd2+ in a single condition, except 50BS + 25CT, 50BS + 50CT two modified, the other modified soil were exothermic entropy reduce process. Complex conditions, except 100BS, 100BS + 25CT two modified soil were exothermic entropy increase process. The adsorption isotherm was described by Langmuir model.