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۱Adsorption of 2,4–dichlorophenol on metal–nitrate modified xerogel from aqueous solutions
نویسنده(ها): ،
اطلاعات انتشار: دومین همایش سراسری محیط زیست، انرژی و پدافند زیستی، سال
تعداد صفحات: ۹
Contamination of natural water with organic pollutants is a problem of major concern and the demand for effective adsorbents for the removal of toxic compounds is increasing. Present work deals with the adsorption of 2,4–dichlorophenol (2,4–DCP) from aqueous solutions on meal–nitrate (Zn,Cd,Ni) modified xerogel (TEOS,TMOS). Metal doping significantly enhanced the adsorption efficiency of xerogel. Of all the preparations, the Nickel (II)–modified xerogel (TEOS) showed the highest adsorption capacity for 2,4–DCP. Batch adsorption studies were carried out to study the effect of various parameters like adsorbent dose, pH, initial concentration and contact time. It was found that adsorption of 2,4–DCP depends upon the solution pH.<\div>

۲Removal 2, 4, 6–trichlorophenol by modified Xerogel from aqueous solutions
نویسنده(ها): ،
اطلاعات انتشار: کنفرانس بین المللی پژوهش در علوم و تکنولوژی، سال
تعداد صفحات: ۹
Contamination of natural water with organic pollutants is a problem of major concern and the demand for effective adsorbents for the removal of toxic compounds is increasing. Present work deals with the adsorption of 2, 4, 6– trichlorophenol (2, 4, 6–TCP) from aqueous solutions on meal–nitrate (Zn, Cd, Ni) modified xerogel (TEOS, TMOS). Metal doping significantly enhanced the adsorption efficiency of xerogel. Of all the preparations, the Nickel (II)–modified xerogel (TEOS) showed the highest adsorption capacity for 2, 4, 6–TCP. Batch adsorption studies were carried out to study the effect of various parameters like adsorbent dose, pH, Initial concentration and contact time. It was found that adsorption of 2, 4, 6–TCP depends upon the solution pH<\div>

۳Synthesis of Modified Nano Xerogel and Use them for Adsorption of Chlorophenol Compounds
نویسنده(ها): ،
اطلاعات انتشار: کنفرانس بین المللی پژوهش در علوم و تکنولوژی، سال
تعداد صفحات: ۱۰
Xerogels are nano–porous materials obtained from drying the sol–gels of tetraalkoxy silanes such as tetramethoxy orthosilane (TMOS). They carry negative surface charges in water where the pH is higher than the Point of Zero Charge. This feature was employed to load divalent metal cations on the surfaces of these materials. Although xerogels do not show affinity for adsorption of chlorophenols from aqueous medium, TMOS xerogel loaded with Zn2+ (TMOS–Zn) showed a 306 percent increase in 2–chlorophenol adsorption compared to that of neat TMOS xerogel. TMOS–Zn adsorbent is stable and follows a chemisorption mechanism for adsorption of 2–chlorophenol..<\div>
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