In this study, by using a sol-gel grafting-atmospheric drying method, amino-terminated SiO 2 -Al 2 O 3 composite aerogels, namely 3-aminopropyltriethoxysilane (APTES) or 3-(2-amino-ethoxy) propylmethyldimethoxysilane (AEAPMDS) modi ed SiO 2 -Al 2 O 3 aerogels (AMSAAs), were synthesized from the y ash, and veri ed as excellent sorbents for removing heavy metal ions (Cu 2+ and Pb 2+ ions) from wastewater. The effects of modi cation conditions and testing parameters including pH value, adsorbent dose, initial ions concentration and adsorption time on the micro-structure of AMSAAs and the removal of heavy metal ions were systematically investigated. And the adsorption mechanism was revealed. Results demonstrated that 0.2 mol/L APTES modi ed aerogels possessed (0.2APTES-SAAs) the best adsorption properties. Under the optimal pH value of 4.0-6.0 and the adsorbent dose of 0.4-0.6 g/L, the equilibrium adsorption capacities of Cu 2+ and Pb 2+ ions were as high as 195 mg/g and 500 mg/g within 20-30 min, respectively. The adsorption processes were agreed fairly well with Freundlich isotherm adsorption model and the pseudo-second-order kinetic model, which indicated that the adsorption processes were heterogeneous multilayer adsorption and controlled by the chemical reaction between AMSAAs and heavy metal ions.
In this study, by using a sol-gel grafting-atmospheric drying method, amino-terminated SiO2-Al2O3 composite aerogels, namely 3-aminopropyltriethoxysilane (APTES) or 3-(2-amino-ethoxy) propylmethyldimethoxysilane (AEAPMDS) modified SiO2-Al2O3 aerogels (AMSAAs), were synthesized from the fly ash, and verified as excellent sorbents for removing heavy metal ions (Cu2+ and Pb2+ ions) from wastewater. The effects of modification conditions and testing parameters including pH value, adsorbent dose, initial ions concentration and adsorption time on the micro-structure of AMSAAs and the removal of heavy metal ions were systematically investigated. And the adsorption mechanism was revealed. Results demonstrated that 0.2 mol/L APTES modified aerogels possessed (0.2APTES-SAAs) the best adsorption properties. Under the optimal pH value of 4.0–6.0 and the adsorbent dose of 0.4–0.6 g/L, the equilibrium adsorption capacities of Cu2+ and Pb2+ ions were as high as 195 mg/g and 500 mg/g within 20–30 min, respectively. The adsorption processes were agreed fairly well with Freundlich isotherm adsorption model and the pseudo-second-order kinetic model, which indicated that the adsorption processes were heterogeneous multilayer adsorption and controlled by the chemical reaction between AMSAAs and heavy metal ions.
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