Kinetic and Thermodynamic Study of Adsorption of Copper (II) Ion on Moroccan Clay

Abstract

<jats:p>Highly efficient low-cost adsorbent was applied for copper (II) ions uptake from aqueous solution. Characteristics of natural adsorbent were established using scanning X-ray diffraction (XRD), X-ray fluorescence, electron microscope (SEM) and Fourier Transform Infra-Red (FTIR). Various physicochemical parameters such as contact time, initial copper(II) ions concentration, adsorbent dosage, pH of copper (II) ions solution and temperature were investigated. The result showed that the adsorption of copper (II) ions by natural clay was favorable at pH=5,5. The adsorption was found to increase with increase in initial copper (II) ions concentration, and contact time. Equilibrium adsorption data were fitted using three isotherms and kinetic data tested with four kinetic models. Freundlich isotherm best described the adsorption of copper (II) ions onto utilised clay, the maximum monolayer adsorption capacity (qmax) was 8 mg/g. Pseudo-second-order model best described the kinetics of the adsorption process. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were determined. It was found that copper (II) ions adsorption was spontaneous (ΔG°&lt;0) and endothermic (ΔH°&gt;0).</jats:p>

Kinetic and thermodynamic study on adsorption of cadmium from aqueous solutions using natural clay

“…The FT-IR spectra (Figure 2) show a band that ranges between 3100-3700 cm -1 located at 3436 cm -1 due to the presence of the stretching vibrations of the internal OH groups of H2O molecule (23,24), the two bands at 1637 cm -1 and 1381 cm -1 are attributed to the deformation of H2O (25,26). The bands located at 693, 776, 1005 cm -1 , and 1031 cm -1 correspond to Si─O stretching vibrations (16,23,(26)(27)(28)(29). Intense peaks at 472 cm -1 and 533 cm -1 are attributable respectively to the deformation of Si─O─Mg and Si─O─Al (30).…”

“…Moreover, the research and development of new low-cost, cost-effective, and efficient adsorbents for ecosystem treatment remains a great challenge. Natural adsorbents such as agricultural solid waste, algae, soils, and clays modified or not have shown promising profitability for trapping pollutants (4,6,15,16). Recently clay minerals have received considerable attention as alternative adsorbent materials that are less expensive, abundant and have multifunctional properties depending on the type of clay (17).…”

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

“…Berdasarkan Gambar 5 dapat diketahui bahwa kapasitas adsorpsi meningkat seiring tingginya pH. Ketika pH rendah atau asam (<4), permukaan adsorben dikelilingi oleh ion-ion H + yang dapat menurunkan interaksi Cu 2+ dengan adsorben (Essebaai et al, 2019). Seiring bertambahnya pH, gugus Al-OH dan Si-OH cenderung melepas H + sehingga permukaan bersifat negatif dan berinteraksi dengan ion Cu 2+ .…”

“…Isoterm Langmuir menunjukkan bahwa proses adsorpsi terjadi secara kimia (kemisorpsi) dan membentuk lapisan tunggal (monolayer). Ion Cu(II) dapat berinteraksi membentuk suatu senyawa dengan adsorben (Essebaai et al, 2019). Interaksi kimia pada adsorben dapat terjadi jika gugus aktif silanol dan aluminol akan melepaskan ion H + yang selanjutnya berikatan dengan OHdari larutan membentuk H2O.…”

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

“…Langmuir isotherm shows that the adsorption process occurs chemically (chemisorption) and forms a single layer (monolayer). Cu(II) ions can interact to form a compound with the adsorbent[17]. The negatively charged adsorbent surface will bind to Cu(II) ions through coordination covalent bonds.…”