Removal of Pb²⁺, Cd²⁺, and Cu²⁺ from phosphoric acid solution using the chitosan‐modified natural zeolite

Abstract

Sorption ability of the chitosan-modified natural zeolite for Pb 2+ , Cd 2+ , and Cu 2+ cations was investigated. The influence of time and concentration of heavy metals on their sorption from concentrated (85% H 3 PO 4 ) phosphoric acid was determined. At 20 and 40 min of sorption curves, there are a number of maxima probably due to desorption of cations from the sorbent into the acid. According to the results, sorption of the modified zeolite for lead cation is the least in the whole interval of time. In the case of equal concentrations of all cations (C Pb = C Cd = C Cu ), sorption of lead, cadmium, and copper was 94.81-95.09%, 96.55-97.50%, and 97.53-98.14%, respectively. Sorption curves in the case of equal Pb 2+ and Cd 2+ , but higher concentrations of Cu 2+ , are the same for all cations. Sorption of cadmium varies from 95.48% to 97.55%. Copper and lead sorbed in a less amount, in the case of (С Рb = С Cd < С Cu ), their sorption in 10 min was 95.42% and 97.55%, respectively. As in the case of equal concentrations of all cations (C Pb = C Cd = C Cu ), the sorptions of copper, cadmium, and lead were (92.09-96.93%), (92.13-95.37%), and (91.35-94.45%), respectively, in the case of (С Рb = С Cu < С Cd ).Physico-chemical methods of analysis are as follows: Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray powder diffraction patterns, and Brunauer-Emmett-Teller have shown that natural zeolite is activated without destroying the structure and adsorbs lead, as well as cadmium and copper cations.

The Analysis of Low-Cost Pb(II) Adsorbents using Batch Method of Solid-Phase Spectrophotometry

“…Water purification is being carried out by many researchers using natural materials such as natural zeolites or its modification (Kussainova et al, 2018), moss (Koz & Cevik, 2014), tea residue (Dizadji & Anaraki, 2011), coconut shell (Rohmah, Masykuri, Saputro, & Mahardiani, 2018), water hyacinth , corncobs et al,s with high purification capacity such as nano sorbent, graphene, and other polymeric materials (Liu et al, 2013;Yang et al, 2015;Li & Ge, 2018). These high capacity purification materials are still relatively expensive, while the need for water purification is increasing due to the increasing amount of wastewater.…”

The use of Alizarin modified bentonite for removal of some heavy metals ions from the wet process phosphoric acid

“…Moreover, the sorption ability of the chitosan-modified natural zeolite for Pb 2+ , Cd 2+ , and Cu 2+ cations studied from concentrated phosphoric acid (Kussainova et al, 2015). The Amberlite XAD-7 impregnated with Cyanex 301, was selected among several supports and organophosphorus extractants for its high affinity for cadmium in phosphoric acid solution (Reyes et al, 2001).…”