Tailoring the optical properties of zinc/copper–incorporated onto eggshell synthesized via electrochemical method

Khairol, Nurul Fahmi; Danish, Mohammed

doi:10.1016/j.matpr.2020.05.302

Cited by 3 publications

(1 citation statement)

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“…Calcium (Ca) is an environmentally friendly modifier with non-toxic properties with abundant resources in nature. − Some studies have found that many materials (such as clinoptilolite, sludge, and biochar) modified by a Ca source have high adsorption capacities for the pollutants from water. Mitrogiannis et al successfully prepared a zeolite-based adsorbent modified by Ca(OH) 2 .…”

Section: Introductionmentioning

confidence: 99%

Use of Eggshell-Catalyzed Biochar Adsorbents for Pb Removal from Aqueous Solution

et al. 2022

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Eggshell is a cheap and environmentally friendly calcium source. In this study, Ca-modified biochar adsorbents (CEA) were prepared by 1:10, 1:2, and 1:1 mass ratio of the eggshell and Eupatorium adenophorum. The CEA-2 sample prepared with a 1:2 mass ratio showed a maximum Pb adsorption capacity (97.74 mg·g –1 ) at the conditions of an initial pH of 7.0, an adsorbent dosage of 0.5 g·L –1 , and a contact time of 8.0 h. The kinetic and isotherm studies indicated that the adsorption process of the CEA-2 sample had monolayer adsorption characteristics, which was controlled together by intraparticle and interface diffusion. Thermodynamic studies indicated that the adsorption process of CEA-2 was spontaneous (Δ G 0 <0) and endothermic (Δ H 0 > 0). X-ray diffraction and scanning electron microscopy analyses showed a uniform distribution of Ca–Pb precipitation on the CEA-2 surface, which proved that chemical precipitation was the main adsorption mechanism. Fourier transform infrared spectra found that CEA-2 had abundant active groups, especially nitrogen-containing functional groups, which could adsorb Pb through a surface complexation reaction. The Brunauer–Emmett–Teller surface area of CEA-2 was found to be 621 m 2 ·g –1 , and such developed pores could ensure the smooth diffusion of Pb. Finally, the effect of coexisting cation and anion experiment and the cyclic regeneration experiment indicated that CEA-2 had prominent stability and reusability for Pb adsorption.

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