Mohamed Ibrahim Dosouky Helal
Cairo University, Egypt
Mohamed Ibrahim Dosouky Helal is the Professor of Soil Chemistry at Cairo University Egypt. He has done his Ph.D. in Soil Science from Cairo University in 1988. He is also the Vice President of National Committee of Soil Sciences. He published 8 articles in international journals as recorded by Scopus data base. He has 1- Membership in Egyptian Soil Science Society since 1984 and with African Soil Science Society since 1988.
Nanotechnology offers a number of highly efficient and less costly techniques that could work to immobilize contaminants. Nano-particles; nano scale zero valent iron “nZVI”, nZVI-bentonite, nanoalginite, and nano carbon; are used as a potential sorbents to immobilize Cd and Pb in polluted soils. These nano-particles are prepared in lab either using top-down or bottom-up methods, then characterized using transmission electron microscope (TEM). The prepared nano-particles proved to have very small size (less than 70 nm), high surface area (194.2-259.7 m2/g) and cation exchange capacity (42.5-47.7Cmolc/kg). Also, the prepared nano-particles proved high adsorption capacity for Pb and Cd, and high retention for the adsorbate metal. The maximum adsorption capacity of nano-particles ranged from 37450-93450 and 17850-25970 mg kg-1 for Pb and Cd, respectively. Moreover, except for nano carbon, only small quantities represent 10.8-33.4% and 13.7-35.6% of the previously adsorbed Cd and Pb, respectively, were released.
Speaker PPTsDownload PPT