FLUORIDE ADSORPTION ONTO a-Al2O3 AND ITS EFFECT ON THE ZETA POTENTIAL AT THE ALUMINA–AQUEOUS ELECTROLYTE INTERFACE
نویسندگان
چکیده
Fluoride removal from aqueous solutions using a-Al2O3 as an adsorbent was investigated through adsorption and electrokinetic studies, using two different initial fluoride concentrations relevant to fluoride contents in drinking water, namely 3 and 10 mg/L. Maximum fluoride removal was achieved between pH 5 and 6 at 258C. Adsorption at both pH 5 and 9 correlates to the Langmuir isotherm. The point of zero charge (pzc) of a-Al2O3 at 208C was determined using three different concentrations of NaNO3 as an indifferent electrolyte. It was found to occur at pH 9.2. Through mineral/solution equilibria, this pzc was determined to be close to pH 9.5 of minimum solubility of amorphous aluminum hydroxide,
منابع مشابه
بررسی تاثیرآلومینای فعال بر غلظت فلوراید موجود در آب و تعیین ایزوترم ها و سینتیک جذب
Backgrounds and Objectives: Determination of Fluoride in drinking water has received increasing interest, duo to its beneifical and detrimental effects on health. The aim of this research is investigation of Effect of activated alumina in fluoride concentration reduction in drinking water.Materials and Methods: Expriment in batch system and with change effective parameters such as pH(5, 7,9), ...
متن کاملThe effect of cobalt addition on the meso-porous structured γ-Alumina synthesized by aqueous sol-gel method
In the present study, the gamma alumina (γ-Al2O3) nano powders have been prepared with addition of 1%mol Co using an aqueous sol-gel method at lower temperature than the pure gamma alumina. The synthesis process accomplished by partial hydrolysis of the aqueous solution of metallic ions Al3+ and Co2+, with ammonia. The Al(NO3)3.9H2O and Co(NO3)2.6H2O salts were used as cations sources. The obta...
متن کاملEffect of nano-Al2O3 particles concentration on microstructure and corrosion behavior of Co-P-nano-Al2O3 composite coating
Composite coatings containing P and ceramic particles are considered in terms of properties such as corrosion resistance, oxidation resistance and high hardness. In this study, Co-P-nanoAl2O3 composite coating was fabricated on the AISI 430 stainless steel substrate using a direct current electric deposition technique. The quality of the coating and its corrosion resistance were studied by chan...
متن کاملYield stress-zeta potential relationship of oxide dispersions with adsorbed polyacrylate: Steric effect and zeta potential at the flocculated-dispersed transition state
The yield stress-DLVO force relationship is obeyed by α-Al2O3 and alumina-coated TiO2 dispersions with adsorbed polyacrylate only if the yield stress and its corresponding zeta potential data were collected in the positively charged region. In this region, the underlying surface positive charge density of the particles exceeds the negative charge density of the polyacrylate. At this state the a...
متن کاملFluoride Removal from Aqueous Solutions by NaOH-Modified Eucalyptus Leaves
Introduction: Fluoride (F) and its compounds are widely used in industries in which fluoride overdose leads to various detrimental diseases. In this study the effect of NaOH-modified Eucalyptus leaves on fluoride removal from aqueous solutions as a natural adsorbent was investigated. Materials and Methods: The focus of this study was on the effects of parameters such as pH (2-12), initial conc...
متن کامل