Adsorption of heavy metal ions (Cu2+, Ni2+, Co2+ and Fe2+) from aqueous solutions by natural zeolite

Abstract

The process of remove copper, nickel, cobalt and iron ions by natural zeolite of the Yagodninsky deposits, Kamchatka region, from water resources within a concentration range of 0.5–3.5 mg-eq/L has been experimentally investigated. The specified concentrations range was chosen according the contents of heavy metals in the waste water of the mining enterprise of Kamchatka region The values of maximum sorption capacity have been determined. On the basis of studies using X-ray powder diffraction (XRD) it has been established by the Rietveld method of calculation that the zeolite tuff of the Yagodninsky deposit consists of clinoptilolite-Na (23.0 %), clinoptilolite-Ca (52.1 %) and modernite (12.9 %). It has been established that exchange cations are sodium, calcium, potassium and magnesium. The Gibbs free energy has been calculated which is equal for copper ΔG = –25.6 kJ/mol, iron – ΔG = –23.7 kJ/mol, nickel – ΔG = –21.5 kJ/mol and cobalt – ΔG = –20.0 kJ/mol. The obtained results show that natural zeolite can be used as an effective sorbent for extracting of ions Cu 2+ , Ni 2+ , Co 2+ and Fe 2+ from polluted waters. On the basis of the analysis of the parameters of the mordenite crystal lattice a decrease in sizes in the direction of the a - and b -axes and, consequently, of the elementary cell volume of the treated zeolite is observed as compared with the initial zeolite in the Cu > Ni > Co > Fe row. New knowledge about the sorption properties of the Yagodninsky deposit zeolites can be interesting for the industrial areas of South-Eastern Asia such as China, Japan, Korea, etc.

Modeling of Solid-Fluid non-catalytic Processes for Nickel Ion Removal

“…The most used methods for heavy metal removal is adsorption, the adsorption process has been involved for treatment of contaminated water, because is a cheap and convenient method as compared with various techniques [4,[12][13][14]. So far, certain materials have been used to retain this type of pollutant using adsorption process: Layered double hydroxides (LDH) [15,16], Chitosan Coated Cobalt Ferrite [14]; Biochars produced from wheat straw pellets and rice husk [17]; Peat [18]; Adsorbents from fly ash [2,19]; Natural zeolite [20]; Natural, Sodium and Acid Modified Clinoptilolite-Rich Tuff [1]; Modified zeolite [21], sawdust [22].…”

Removal of Pb(II) in Aqueous Solutions Using Synthesized Zeolite X from Ecuadorian Clay

“…To determine whether pore diffusion was the only rate-limiting step in the adsorptive study of this system, experimentally obtained kinetic data was fitted to the Bangham-Burt model stated in Equation (10). The linear plot presented in Figure 11b and the corresponding R 2 values given in Table 7 suggest that pore and film diffusion influenced the kinetic mechanism.…”

“…Adsorption is an efficient separation technique that has been in use for a long time to remove heavy metal ions. In aqueous solutions, a wide variety of solid adsorbents have been reported, such as natural zeolites (Belova, 2019), bentonite (Ramola, Belwal, Li, Wang, and Zhou, 2020), cassava peel (Albis, 2016), activated carbon (Zafarzadeh, Sadeghi, Golbini-Mofrad, and Beirami, 2018), carbon nanotubes (Wang, Zhou, Peng, Yu, and Yang, 2007) or clay monoliths (Ahrouch, Gatica, Draoui, Bellido, and Vidal, 2019), among others.…”

Removal of Ammonium from Swine Wastewater Using Synthesized Zeolite from Fly Ash

“…The internal structure of zeolite has a pyramid (tetrahedron) unit and Si 4+ was substituted by Al 3+ in the skeletal structure so it has a negative charge [45]. According to the conservation of charge, the negative charge is balanced by cations with positive charge (A n+ , such as sodium and calcium ion) on the zeolite's surface, which bind to the zeolite with faint electrostatic action and then have a strong ion exchange capacity for other surrounding cations in a solution [46]. It generally exhibits a high selectivity for NH 4 + .…”