Removal of Heavy Metals Cd (II), Fe (III) and Ni (II), from Aqueous Solutions by Natural (Clinoptilolite) Zeolites and Application to Industrial Wastewater

Abstract

The adsorption mechanism of Cd, Fe, and Ni, ions on natural (clinoptilolite) zeolites, a regional lowcost natural available adsorbent was studied in a batch adsorption system. The effect of several parameters such as contact time, zeolite dose, particle size, the effect of pH, and initial concentration of metal ions in the adsorption process was estimated. The optimum adsorption was found to occur at pH 6.0, adsorbent dose 1.0 g/L, and initial concentration 2, 20 and 10 mg/L for Cd, Fe, and Ni, respectively. The adsorption efficiency also increases with decreasing particle size of zeolites and the effect of retention time on adsorption ratio shows that 80% of the Cd, Fe, and Ni, are adsorbed by zeolite during first 120 minutes. Under these optimum conditions, the removal efficiency was 78.8, 89.1, and 65.5% of Cd

Metal Removal from Nickel-Containing Effluents Using Mineral–Organic Hybrid Adsorbent

“…The maximum removal of Ni(II) was achieved at pH range 4.0-6.0 and amounted to 17%, which was considerably lower than values obtained in batch experiments. Ni(II) removal by natural zeolite from wastewater constituted 60%; however, the initial Ni(II) concentration was almost 35 times lower than in the present study [42]. One of the ways to increase metal ion removal is to increase the dosage of the adsorbent.…”

Pomegranate peels as versatile adsorbents for water purification: Application of box–behnken design as a methodological optimization approach

“…BET surface area of BPG is comparable to that of natural zeolites, however, the % of Ni(II) removal was much better in case of the former. BET surface area and henceforth the % of Ni(II) removal of kaolinite and charcoal ash was lower compared to BPG [41][42][43][44][45][46].…”

“…BPG (current study) Cashew nut shell [41] Kaolinite [42][43][44] Natural zeolites [45] Charcoal ash [46] Availability findings of FTIR and BET surface analyses that the burning process has removed most of the oxygenated functional groups. The greater carbon content in case of BPG might explain the higher efficiency of BPG in removing Ni(II).…”

The Simultaneous Removal of Zinc and Cadmium from Multicomponent Aqueous Solutions by Their Sorption onto Selected Natural and Synthetic Zeolites

“…The second conversion was performed using the adequate values of molar weights, 65.38 g/mol for Zn and 112.41 g/mol for Cd. When compared to the values provided in other scientific papers on the same subject [19,[22][23][24]26,[69][70][71], the tested minerals were demonstrated to display similar or greater sorption capacity comparing to the similar sorbents and other novel materials tested to remove heavy metals from wastewater effluents. That makes them a good, cost-efficient, and environmentally friendly alternative in the processes of purification of water polluted with heavy metal ions.…”

“…The possibilities of the efficient removal of heavy metals from polluted waters and of the limiting of the inclusion of heavy metals to the food chain at the level of plants-soils interactions was the subject of numerous studies, also performed by the authors of this work [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Those findings were at the basis of the experimental hypothesis of this research, which assumed that natural and synthetic aluminosilicate minerals were highly efficient, low-cost, and environmentally friendly materials in removal of heavy metals from water.…”