Microstructural and Equilibrium Adsorption Study of the System of Waste Foundry Molding Sand/Cu (II) Ions

Abstract

MIcrostructural and equIlIbrIuM adsorptIon study of the systeM of waste foundry MoldIng sand/cu (II) IonsThis paper deals with the waste foundry molding sand which originally comes from the casting production. Adsorption of Cu (II) ions on the waste foundry molding sand was studied. Experimental data were processed using adsorption isotherms. obtained results show that the experimental data are best described by the Langmuir isotherm. The following adsorption capacities are obtained: 7.153 mg/g to 293 k, 8.403 mg/g at 333 k and 9.208 mg/g at 343 k. The kinetics and thermodynamics of the process were analysed. The obtained results indicate that the adsorption process takes place according to the pseudo second order kinetic model with the following constants: 0.438 g/mg min at 293 k, 0.550 g/mg min at 333 k and 1.872 g/ mg min at 343 K. The following values of ΔG° were obtained: -95.49 j/mol at 293 k, -736.99 j/mol at 333 k and -1183.46 J/mol at 343 K. The value of ΔH° is -4.16 kJ/mol and the value of ΔS° is 15.17 j/molk. These results were confirmed by microscopic examinations. The results indicate that the adsorption process of Cu (II) ions on waste foundry molding sand is possible. Results of microscopic examinations show the homogeneity of the surface, which is proof of the chemisorption. Cu (II) ions on the surface of the waste foundry molding sand were detected after adsorption by EDS analysis, which proves the existence of the adsorption process.

The synergism of andisol soil and foundry sand mixture as Cu(II) ion adsorbent

“…The utilization of andisol soil can be optimized by adding foundry sand. Foundry sand results from dismantling metal casting molds whose primary constituent material is silica sand [7]. After being used, this waste is usually thrown away in a waste reservoir on open land around the processing site.…”

ADSORPTION OF Cu(II) IONS USING FOUNDRY WASTE

“…Very often, waste moulding mixture and slag are used in construction, but also in road construction [2,3]. In addition, tests of the adsorption properties of waste foundry materials are very widespread [4][5][6][7]. This type of research and the possibility of using it for adsorption is certainly very significant since this type of waste usually consists of metal oxides, such as SiO2, Al2O3, MgO, CaO, FeO, Fe2O3 (sand, slag, scale, waste after shot blasting), clay (binders) and carbon-based materials (various additives to improve the properties of the moulding mixture) which are known as good adsorbents.…”

Sinergisme Campuran Tanah Andisol dan Pasir Foundry sebagai Adsorben Ion Cu (II) pada Limbah Industri Pelapisan Logam

“…Pemanfaatan tanah andisol dapat dioptimalkan dengan penambahan pasir foundry. Pasir foundry merupakan hasil dari bongkaran cetakan pengecoran logam yang bahan penyusun utamanya adalah pasir silika, sementara sisanya adalah zat pengikat contohnya bentonit (Strkalj et al, 2016). Setelah digunakan biasanya limbah ini dibuang begitu saja di penampungan limbah pada lahan terbuka di sekitar tempat pengolahan.…”