Removal of hexavalent chromium from contaminated water using zno-al2o3 nanoparticles composite immobilized in sodium alginate

摘要

(to be given along with complete specification on separate page) An objective of the present invention is to provide the following: development of an efficient sorbent by immobilizing ZnO - AI2O3 nanoparticles composite in sodium alginate to remove hexavalent chromium from contaminated environmental water matrices. To obtain the above application, the present inventors have carried out experiments meticulously and found that the immobilized ZnO - AI2O3 nanoparticles composite removed Cr(VI) at a higher adsorption capacity of 452.37 mg/g compared to the ZnO - AI2O3 nanoparticles composite suspension (376.98 mg/g). Moreover, the present invention also provides a method for preparing ZnO - AI2O3 nanoparticles composite (80 mg/L + 20 mg/L) and immobilizing in 5% w/v sodium alginate. The present invention makes it possible to obtain an efficient sorbent to remove Cr(Vl) at an adsorption capacity of 420.27, 425.54, 397.3, and 380.21 mg/g from environmental water matrices i.e. ground water matrix (EM 1), ground water matrix (EM 2), lake water matrix (EM 3), and waste water matrix (EM 4) respectively. The present invention is efficient and this makes it possible to be used for Cr(VI) removal from contaminated water sites.