Study On The Performance For Adsorbing Heavy Metal Ions By Organic Attapulgite

In recent years, the damage of heavy metals, printing and dyeing waste water pollution has been a growing cause for concern. Seeking methods which are harmony with the environment and can repaire green environmental governance. The attapulgite clay is a kind of environmental restoration and purification of functional materials, which has a very good compatibility with the environment. As an adsorbent, the attapulgite clay own high specific surface area, porosity, polarity, and other features, and its price is very cheap.The attapulgite clay has modificated by extraction of hydrochloric acid. Then, separately to modificated by cetyl trimethyl ammonium bromide and sodium stearate. Using scanning electron microscopy were observed before and after modification of the attapulgite clay, Discovery of modified attapulgite clay crystal rods were scattered and stripping, and uniform particle size. By means of simulated wastewater solution of Ni(II), Cr(VI), Cu(II) and methylene blue substances such as adsorption behavior research, explore the organic modification of attapulgite clay and the original soil, acid modified soil modification of soil adsorption, thermal performance. Including the proportion of organic modification, adsorbent additive quantity, temperature, pH value, adsorption time, initial concentration of adsorbate and other factors.Under the optimized experimental conditions, the modified attapulgite clay for Ni(II), Cr(VI), Cu(II) and methylene blue adsorption capacity all increased. O- ATP for Ni(II) the optimal conditions for adsorption included the concentration of 100.00 mg/L, adsorbent dosage is 0.8 g, 4 h adsorption time, temperature 20 ?, pH=4.0, the adsorption rate of 85.46%, the adsorption quantity of 10.68 mg/g; Adsorption of Cr(VI) the optimal condition is: the concentration of 100.00 mg/L, adsorbent dosage is 0.8 g, 4 h adsorption time, temperature 20 ?, pH=4.0, the adsorption rate of 84.27%, the adsorption quantity of 8.69 mg/g; O- ATP for Cu(II) the optimal conditions for adsorption included the concentration of 100.00 mg/L, adsorbent dosage is 0.6 g, 2 h, adsorption time, temperature 30 ?, pH=5.0, the adsorption rate of 89.37%, the adsorption quantity of 8.15 mg/g; The optimal conditions for adsorption of methylene blue: the concentration of 200.00 mg/L, adsorbent dosage is 0.6 g, 2 h, adsorption time, temperature 30 ?, pH=4.0, the adsorption rate of 81.67%, the adsorption quantity of 48.6 mg/g. Organic modification of attapulgite clay for Ni(II), Cr(VI), Cu(II) and methylene blue adsorption is better than hot hydrochloric acid modified bentonite and modified bentonite, salt-treated soils of the adsorption effect.Desorption experiments show that organic modification of attapulgite clay for Ni(II), Cr(VI), Cu(II) of adsorbate and methylene blue with recycling capacity, desorption and adsorption rate after three times before can be reached 57.08%, can save costs and improve efficiency.Finally, the adsorption thermodynamics and kinetics of composite adsorbent are studied. The result indicates that in most cases the composite adsorbent is priority to chemical adsorption, physical adsorption is auxiliary adsorption mode, with the combination of the monolayer and multilayer adsorption.