To investigate the adsorptive properties of a local laterite deposited in Chenzhou, Hunan province,
China, the adsorptive properties of the natural laterite were investigated by batch technique in this study. The
effects of contact time, pH, ionic strength, temperature, and the concentration on adsorption properties were also
analyzed. The obtained experimental results show that the main mineral composition of laterite is kaolinite and
montmorillonite. The adsorption process achieved equilibrium within 60 minutes and 90 minutes for Sr(II) and
Cr(VI), respectively. The adsorption capacities for Cr(VI) and Sr(II) by the laterite were about 7.25 mg·g-1 and
8.35 mg·g-1 under the given experimental conditions, respectively. The equilibrium adsorption data were fitted to
the second-order kinetic equation. The adsorption capacity for Sr(II) onto the laterite increased with increasing
pH from 3–11 but decreased with increasing ionic strength from 0.001 to 1.0 M NaCl. The Sr(II) adsorption
reaction on laterite was endothermic and the process of adsorption was favored at high temperature. Similarly,
the adsorption capacity for Cr(VI) onto the laterite increased with increasing pH from 3–11, however, the ionic
strength and temperature had an insignificant effect on Cr(VI) adsorption. The adsorption of Cr(VI) and Sr(II) was
dominated by ion exchange and surface complexation in this work. Furthermore, the Langmuir and Freundlich
adsorption isotherm model was used for the description of the adsorption process. The results suggest that the
studied laterite samples can be effectively used for the treatment of contaminated wastewaters.
Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies
Informacja
SZANOWNI CZYTELNICY!
UPRZEJMIE INFORMUJEMY, ŻE BIBLIOTEKA FUNKCJONUJE W NASTĘPUJĄCYCH GODZINACH:
Wypożyczalnia i Czytelnia Główna: poniedziałek – piątek od 9.00 do 19.00