Abstract
Mo and Ni metals could be hazardous in natural waters. The initial Mo and Ni concentration in the sampled domestic drinking water of north Jordan is 550 and 110 μg/L, respectively. The efficiency of using natural faujasite–phillipsite and phillipsite–chabazite tuffs in removing Mo and Ni from contaminated drinking water was tested. Batch experiments using different weights of the adsorbent were conducted at different contact times to determine the optimum conditions. The maximal uptake capacity of Mo from drinking water was equivalent to 440–420 μg/g adsorbent. The maximum removal efficiency of Mo by faujasite–phillipsite, phillipsite–chabazite, and the modified surfactant phillipsite–chabazite tuffs were 80%, 76%, and 78%, respectively. The proportional relationship between contact time and removal efficiency of Ni from water samples was observed. The maximum removal efficiency of Ni by the zeolitic tuffs is up to 90% compared to the original groundwater sample.
Highlights
The average Mo concentration in the earth’s crust is very low (1.2 mg/kg) [1] and is uniform in common igneous rocks [2]
The size fraction (1–0.3 mm) forms 42% by weight of the original sample with the highest zeolite wt % (55% and 65% in Tall Mufteya (TM) and the HN samples, respectively) compared with the total zeolite content in the original samples, which varies between 35% and 40%
The scanning electron micrographs of the TM sample emphasized the presence of phillipsite and chabazite as aggregates ranging in size from 600 to 100 μm (Figure 2)
Summary
The average Mo concentration in the earth’s crust is very low (1.2 mg/kg) [1] and is uniform in common igneous rocks [2]. Mo is a redox-sensitive metal that occurs in low but measurable abundance in aquifers [9] It forms molybdate oxyanions (HMoO4 −1 ) and (MoO4 2− ) in natural water at a pH range of (2–5) and above 5, respectively [10]. Ni is an essential the free ion Ni it is predominates because it is highly mobile under acidic, oxidizing mineral for life. Modified forms of Natural zeolites are important inorganic ion exchangers and adsorbents [18]. Modified forms natural zeolites are low-cost available resources. The surfactant modified zeolites (SMZ) are a form of zeolite that combines the aqueous system [18]. With the anionic thenon-polar enhancedorganic cation sorption properties of natural zeolites with the ability to sorb anionic species, species, and pathogens from aqueous streams [19]. Mo and Ni from contaminated drinking water supplies of the WAWF
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