Abstract
It is a strategic target now to reuse treated industrial waste water for washing, irrigation etc., to efficiently manage and maximize Sudanese's water resources. The aim of the present work was to study the performance of natural zeolite (scolecite) for removing heavy metals from industrial waste water. Natural zeolite deposit sample was collected from Bayooda desert. Natural zeolite used (scolecite) was characterized by XRD, XRF, SEM and FTIR instruments. The physical properties (pH, EC, TDS, COD, BOD, total hardness) and chemical properties (Ni2+, Pb2+, Zn2+, Cd2+, Fe3+, Cr3+) of the collected industrial waste water samples were investigated. Zeolite sorbed around 95.8, 88.1, 48, 50, 19.7 and 99.9% of Ni2+, Pb2+, Zn2+, Cd2+, Fe3+ and Cr3+ metal concentrations respectively. According to the percentage sorption values, the selectivity sequence of studied metals by natural zeolite can be given as Cr3+>Ni2+
Highlights
Scolecite is a tectosilicate mineral belonging to the zeolite group; it is a hydrated calcium silicate, CaAl2Si3O103H2O
Our objective in this study is to investigate the removal of inorganic pollutants like Ni2+, Pb2+, Zn2+, Cd2+, Fe3+ and Cr3+ metal ions from a model solution by the scolecite natural zeolite (SNZ)
The identification of the zeolite was carried by X-Ray diffract meter (XRD), system: Philips, Model: X-pert PRO stress XRD analyzer Cu-target radiation, used in the present work phase analysis was achieved by using XRD, sample was analyzed and found to be scolecite Figure 1
Summary
Scolecite is a tectosilicate mineral belonging to the zeolite group; it is a hydrated calcium silicate, CaAl2Si3O103H2O. Scolecite is isostructural (having the same structure) with the sodium-calcium zeolite mesolite and the sodium zeolite natrolite, but it does not form a continuous chemical series with either of them [1]. It is a mineral of secondary origin, and occurs with other zeolites in the amygdaloidal cavities (cavities filled with secondary minerals) of weathered basalts, in gneisses and amphibolites, and in laccoliths and dikes derived from syenitic and gabbroic magmas, and in contact metamorphic zones. Associated minerals include quartz, apophyllite, babingtonite, heulandite, stilbite and other zeolites Due to their structural characteristics, natural zeolites can be used in several applications, from which Pansini [3] reviewed those of environmental interest. Our objective in this study is to investigate the removal of inorganic pollutants like Ni2+, Pb2+, Zn2+, Cd2+, Fe3+ and Cr3+ metal ions from a model solution by the scolecite natural zeolite (SNZ)
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