Preparation Of Modified Illite By Coupling Agent And Application Of Heavy Metal Wastewater Treatment

In recent years,with the accelerated pace of industrialization and the acceleration of industrial restructuring,environmental issues have become the focus of attention throughout China and the world.In particular,heavy metal pollution has become a major obstacle to barrier to solving environmental problems in developing countries.Common methods of heavy metal treatment: membrane separation method,chemical precipitation method,ion-exchange method,oxidation-reduction method,microbiological method,electrochemical process etc,in view of the above processing methods exist high operating costs,complex operation,large investment and other drawbacks,so adsorption treatment has become a hot spot for heavy metal wastewater treatment.Clay minerals are increasingly favored by researchers as a costeffective adsorbent.However,as one of the four major clay minerals,Illite stone,in the application of heavy metal treatment is relatively rare,the modification of Illite stone research is rarely discussed.Henan Pingdingshan City has a rich reserves of Illite stone,known as the "The city of Illite stone".In order to make full use of local resources and improve the utilization value of Illite stone,in this paper,Illite was selected as the research object,and the heavy metal wastewater was treated by using the amino silane coupling agent?KH550?modified Illite ore.Specific research includes the following aspects:?1?Modified Illite?KH550-Illite?was prepared by the modified method of KH550 and illite mixed with heating.the results are shown by single factor experiments,the best modification conditions: 50 mL ethanol solution by adding 5m L KH550,ultrasonic 20 min after adding 40 g illite ore,55? constant temperature water bath stirring 2h,with anhydrous ethanol repeatedly washed and dried to produce finished product KH550-Illite.?2?X-ray diffraction?XRD?,scanning electron microscopy?SEM?,specific surface area and pore size?BET?and Fourier transform infrared spectroscopy?FTIR?were used for the analysis of illite ethers,KH550-Illite and Illite containing saturated Pb²⁺.The results show that: KH550 on the illite ore modification is grafted in the Illite ore surface to form a special membrane,and this special membrane surface contains a organic functional group-NH₃⁺ which is very easy to react with heavy metals.?3?The KH550-Illite was used to treatment simulated wastewater containing Pb²⁺ and Cd²⁺ wastewater from the reaction temperature,the reaction pH,the reaction time and the dosage of the adsorbent,and the relevant datum were simulated by adsorbed thermodynamics and adsorption kinetics,the results showed that: 1)under the condition of pH5.0,0.125 g modified Illite was added to 50 m L,150mg/L simulated wastewater containing Pb²⁺,and the adsorption equilibrium was reached after 120 min,and the saturated adsorption capacity was 39.8mg/g;2)under the condition of pH4.0 and 313 k,0.12 g modified Illite was added to 50mL/L simulated wastewater containing Cd²⁺,and the adsorption equilibrium was reached after 90 min,and the saturated adsorption capacity was 16.37 mg/g;3)The adsorption process of Pb²⁺ and Cd²⁺ in KH550-Illite satisfies the Langmuir adsorption isothermal model and can be described by the second-order kinetics model.?4?The KH550-Illite is applied to the treatment of wastewater containing copper from a certain enterprise,the effects of the amount of adsorbent and the reaction time on the whole treatment were discussed,and dynamic simulation was carried out,The results showed that: in 50 m L concentration of 194.65mg/L wastewater containing copper,adding 1.7g KH550-Illite,the removal rate of Cu²⁺ was above 99.5% after 10 min shaking at 25?,The Cu²⁺ concentration in the treated wastewater was lower than 1.0mg/L,to meet the "the emission standards for copper,cobalt and nickel industrial pollution sources"?GB25467-2010?copper emission standards.