Abstract
Wastewater treatment of some heavy metals was carried out by synthetic zeolite P1, which was prepared by alkaline hydrothermal treatment of the pumice. Both of the pumice raw materials and synthetic zeolite were investigated for their chemical phase composition, physical properties, and microstructure. The adsorption behavior of Na-zeolite P1 with respect to Co+2, Cu+2, Fe+2, and Cd+2 has been studied to be applied in the industrial wastewater treatment. Metal removal was investigated using synthetic solutions at different ions concentrations, time, and Na-P1 zeolite doses as well as constant temperature and pH. It is concluded that the optimum conditions for synthesis of highly active Na-P1 zeolite from natural pumice raw material are one molar NaOH concentration, temperature at 80°C, and one week as a crystallization time. In addition to the effect of time and zeolite dose as well as the ion concentration of the reaction efficiency for metals removals are recorded.
Highlights
Zeolite is a natural porous mineral described as hydrated aluminosilicates containing exchangeable alkali and earth alkaline cations (Na+, K+, Ca+2, or Mg+2) and could be synthesised from the aluminium silicate materials as clay minerals and pumice by alkali attack [1,2,3]
The aim of this work is to study the best condition of temperature, sodium hydroxide concentration, and time required for synthesis of Na-P1 zeolite from the local pumice raw material and utilize the synthetic zeolite as an adsorbent for removing (Cd+2, Fe+2, Cu+2, and Co+2) ions from synthetic solutions in a batch laboratory system
It is evident that the treatment with NaOH has a significant efficiency on the physicochemical properties of synthesized adsorbent Na-zeolite P1
Summary
Zeolite is a natural porous mineral described as hydrated aluminosilicates containing exchangeable alkali and earth alkaline cations (Na+, K+, Ca+2, or Mg+2) and could be synthesised from the aluminium silicate materials as clay minerals and pumice by alkali attack [1,2,3]. Synthetic zeolites are carried out in many industrialized countries in Europe, East Asia, and North America Their consumption is dominated by companies manufacturing detergents and catalysts. Synthetic zeolites (molecular sieves) are the major alternate materials to natural zeolites. The unique structural features of these crystalline microporous solids that contain pores and cavities in the order of molecular dimensions (3–10 A ) are the main reason for their application in the realms of catalysis, separation, purification, ion exchange, and radioactive waste clean-up. Na-P1 zeolite is classified as high silica zeolites where it has Si/Al ratio equal to or greater than about 3. It is considered as a hydrated sodium aluminosilicate zeolite that could be synthesised from
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