The Preparation Of Polyaniline/Attapulgite Composite And As Adsorbent For Removal Of Dye

Organic dyes are one of the main pollutants of water environment pollution, the large amount of pollutants caused by the dye has the very high toxicity and carcinogenicity, development of low cost, high adsorption performance of adsorption materials is a hotspot of research on the dye wastewater treatment. Nano Zero-valent iron (nZVI) is a kind of environmentally friendly strong reducing agent, is widely used in the process of organic pollutant degradation, but be easily oxidized and aggregate limits its application. Attapulgite (ATP) is a type of layered structure of hydrated Mg-Al silicate minerals with high surface area, strong adsorption and decoloration ability etc, so as an adsorbent in wastewater treatment has a wide application range and obvious cost advantage. Polyaniline (PANI) molecule contains a large number of amino and the amino functional group has good adsorption and electrical conductivity. In this paper, attapulgite as the carrier, respectively, the preparation of polyaniline/organic modified attapulgite (PANI/ATP) composites and PANI/ATP-supported nano zero-valent (nZVI/PANI/ATP) composites, discussed the material performance of the degradation of organic dyes.The main research content is as follows:(1)Polyaniline/Attapulgite (PANI/ATP) composite was well prepared in a solution of HC1 by static polymerization, in which the attapulgite was modified by cetyl trimethyl ammonium bromide (CTAB). This paper here was focused on the adsorption of water soluble methyl orange (MO) and Alizarin Yellow R (AYR)by adsorption time, temperature and the ratio of CTAB and ATP and other factors. The results showed:Single dye adsorption process, the methyl orange and alizarin yellow R meet the secondary dynamics model and the Langmuir isothermal adsorption equation.The adsorption process has carried on the kinetics and thermodynamics data fitting. In methyl orange and yellow R Alizarin dye binary system, Polyaniline/organic modified attapulgite composite material with alizarin yellow R had better adsorption performance. Desorption test showed that the composites for removing methyl orange and alizarin yellow R has a better performance of repeated use.(2) The Polyaniline/attapulgite (PANI/ATP) as the carrier, PANI/ATP-supported nano-iron were synthesized by liquid-phase chemical reduction method. This paper here was focused on the degradation of water soluble methyl orange (MO) by degradation time and pH, the degradation process has carried on the dynamic analysis, discusses the nanocomposites of mechanism of the degradation of methyl orange. The results show that the nZVI/PANI/ATP composites can effective degradation of methyl orange over a wide range of pH and have a longer degradation. When the catalyst is lg/L, degradation volume of 50ml, methyl orange concentration of 20mg/L, the degradation time for 30min, composite materials for the degradation of methyl orange rate can reach more than 95.8%. The kinetics of methyl orange degradation on the nanocomposites follows the law of pseudo-second order kinetics.(3) With azo dye AYR and azo free dyes methylene blue (MB) as the main pollutants, This paper here was focused on the removal performance of water soluble two kinds of different structure of dye, studied the main factors influencing the two kinds of dye removal performance and different removal mechanism, kinetic and thermodynamic analysis were carried out. The results showed that:composite materials in the removal performance of azo dye of alizarin yellow R, chrome black T, methyl red are significantly better than non-azo dye of methylene blue, rhodamine B, the removal of azo dyes is nZVI play a major chemistry degradation and removal of non-azo dyes is PANI, ATP plays a major role.