Open AccessLead sorption from aqueous solutions by kaolinite: laboratory experiments
Author(s) -
Salih Muhammad Awadh,
Ayad A Yousif
Publication year - 2021
Publication title -
knowledge-based engineering and sciences/knowledge-based engineering and eciences
Language(s) - English
Resource type - Journals
eISSN - 2788-7839
pISSN - 2788-7820
DOI - 10.51526/kbes.2021.2.1.1-8
Subject(s) - sorption , kaolinite , sorbent , aqueous solution , ion exchange , endothermic process , chemistry , adsorption , absorption (acoustics) , inorganic chemistry , ion , mineralogy , materials science , organic chemistry , composite material
The lead has adverse effects in contamination the aquatic environment, for this reason, a laboratory simulation was conducted using kaolinite collected from the Ga’ara Formation at western Iraq to be considered as a natural sorbent material that can be addressed Pb2+ from the aqueous environments. The Energy-Dispersive X-ray Spectroscopy and atomic absorption spectroscopy clarifying very fine grains and pure phase with a very little quantity of quartz and has a number of active sites for adsorption. The sorption of kaolinite for the Pb2+ has been carefully tested by several designed laboratory experiments. Five lead solutions of different concentrations (25, 50, 75, 100 and 125 ppm) were tested under different values of pH (1.3-9). The best sorption has been recorded at pH 9, with an equilibrium reaction time 40 m and the solid-liquid ration 1.25 gm:50 ml. The sorption reaction is endothermic with two main mechanisms were identified, the rapid ion exchange which gets at the beginning of the reaction during the first 10 m, and ion exchange, which gets slow later due to form ionic complexes