Anchored fibrous chrysotile silica and its ability in using nitrogen basic centers on cation complexing from aqueous solution

摘要: Abstract Amorphous silica gel obtained through natural chrysotile was lixiviated with hydrochloric acid, which chemically modified organosilanes (H3CO)3SiR, where R corresponds to the organic moieties CH2CH2CH2NH2 and CH2CH2CH2NHCH2CH2NH2, yielding solids named SIL1 SIL2. These anchored silicas showed 2.14±0.05 1.90±0.04 mmol g−1 of attached amino groups on surfaces SIL2, respectively. The isotherms adsorption data were by batchwise process, whose values adjusted a Langmuir equation. maximum capacity sequence for copper cobalt as 1.02, 0.35 mmol g−1 SIL2 0.71, 0.26 mmol g−1 SIL1, By using calorimetric titration, enthalpy change process 18.77±0.75 −43.29±1.08 kJ mol−1 copper, 12.70±0.57 −169.3±1.23 kJ mol−1 Negative Gibbs free energy are in agreement spontaneity proposed reactions involving both divalent cations, when complexed basic pendant chain covalently bonded inorganic surface.