Immobilization Of Heavy Metals From Aqueous Solution And Sediment By Zirconium Modified Attapulgite

Contamination of Heavy Metal is one of the major environmental problems facing the world today, seriously affecting people’s production and life activities. Clay mineral because it has a non-toxic, cheap and so are increasingly being applied to the environment of heavy metals into the governance and repair. For a variety of heavy metals contamination of sewage and sediment problems in the current, this paper attapulgite clay as the material, the use of zirconium modification method, zirconium modified research on water and sediment arsenic, lead and cadmium pollution control.The study found that when attapulgite and zirconium oxychloride mass ratio of 1:2 modified prepared zirconium (Zr-ATP) to As3+、As5+、Pb2+、Cd2+ have good adsorption properties, mainly As the nano-zirconium ions have been successfully loaded onto attapulgite nano-pores, enhances the status quo attapulgite (ATP) activity, and thereby increasing its adsorption capacity for heavy metals. Batch experiments showed, Zr-ATP to As3+、As5+、Pb2+ Cd2+ adsorption isotherms fit the Freundlich adsorption isotherm model, adsorption kinetics experiments show, Zr-ATP to As3+、As5+、Pb2+、Cd2+ kinetic adsorption pseudo-second power Learn equation, the correlation coefficient reached 0.999 or more, when the adsorbent dosage 8g/L, Zr-ATP to As3+、As5+、Pb2+、Cd2+ adsorption optimal. After three times desorption test, Zr-ATP to As3+、As5+、Pb2+、Cd2+ is still good adsorption performance, indicating Zr-ATP has good recycling properties.From a practical point of consideration for ATP mixing granulation, and using a low temperature (200℃) sintering process, the preparation of particulate attapulgite easily hydrolyzed, particulate attapulgite were zirconium modification, preparation of particulate zirconium modified irregularities stick particles, based on a fixed column adsorption dynamics were studied the adsorption of heavy metals in the preparation of materials for different. The results showed that the optimum water flow rate of 5ml/min, Zr-ATP adsorbent extend the penetration time, improve the adsorption capacity of the adsorbent lily, Zr-ATP adsorbent As3+、As5+、Pb2+、Cd2+ by increased adsorption capacity, respectively up 40.87%,63.75%,30.21%,48.15%, due to the heavy metal ions adsorbent contact time is short, resulting in dynamic adsorption capacity is much lower than the static adsorption capacity.Different types of attapulgite (dolomite attapulgite,700℃ heat modified, ATP, Zr-ATP) and virgin zeolite six kinds of composite materials contaminated sediment immobilization tests and Sediment Extraction of BCR-based form Heavy Metal morphological changes. The results show that with the increase of the added amount of the curing agent, curing agent, the better the effect of sediment, when the Zr-ATP curing agent is applied to the amount of 10%, six kinds of curing agent for the best effect of sediment,6 the material Zr-AT can significantly reduce lead and cadmium in sediments acid extractable to make lead and cadmium extractable acid decreased 14.75% and 28.99%, residual lead and cadmium increased 11.22 percent and 6.58%, TCLP test procedure showed TCLP leaching of lead and cadmium were reduced by 62.04%,85.32%. Biological Evaluation Method (SBET) show, leaching of lead and cadmium were reduced by 63.60% and 51.48%, these results suggest that the curing agent not only changed the form of heavy metals in sediment percentage of lead, cadmium, and lower bottom Bioavailability of heavy metals in the mud.