Adsorptive Removal of Copper by Using Surfactant Modified Laterite Soil

Abstract

Removal of copper ion (Cu2+) by using surfactant modified laterite (SML) was investigated in the present study. Characterizations of laterite were examined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), inductively coupled plasma mass spectrometry (ICP-MS), and total carbon analysis. The optimum conditions for removal of Cu2+ by adsorption using SML were systematically studied and found as pH 6, contact time 90 min, adsorbent dosage 5 mg/mL, and ionic strength 10 mM NaCl. The equilibrium concentration of copper ions was measured by flame atomic absorption spectrometry (F-AAS). Surface modification of laterite by anionic surfactant sodium dodecyl sulfate (SDS) induced a significant increase of the removal efficiency of Cu2+. The surface modifications of laterite by preadsorption of SDS and sequential adsorption of Cu2+ were also evaluated by XRD and FT-IR. The adsorption of Cu2+ onto SML increases with increasing NaCl concentration from 1 to 10 mM, but at high salt concentration this trend is reversed because desorption of SDS from laterite surface was enhanced by increasing salt concentration. Experimental results of Cu2+/SML adsorption isotherms at different ionic strengths can be represented well by a two-step adsorption model. Based on adsorption isotherms, surface charge effects, and surface modification, we suggest that the adsorption mechanism of Cu2+ onto SML was induced by electrostatic attraction between Cu2+ and the negatively charged SML surface and nonelectrostatic interactions between Cu2+ and organic substances in the laterite.

Adsorptive Removal of Antibiotic Ciprofloxacin from Aqueous Solution Using Protein-Modified Nanosilica

“…The adsorbent dosage is effective effect on the adsorption process, because it influences the total surface area and charge density of the adsorbent [4,[41][42][43]. The dosage of ProMNS varied from 1.0 to 50.0 mg/mL (Figure 9).…”

Treatment of Cd2+ and Cu2+ Ions Using Modified Apatite Ore

“…When pH is higher than pH pzc (7.49), the adsorption capacity and efficiency rise. It can be explained as follows: at high pH value, the surface of adsorbent has a negative charge, but if pH is too high, the precipitation of Cd(OH) 2 and Cu(OH) 2 can happen [2,3,15]. To facilitate the practical application, we choose 1 1 1 2 1 3 1 1 1 1 3 2 3 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 pH � pHo � 5.5 (for Cd 2+ ) and 5.6 (for Cu 2+ ) to investigate the next experiments.…”

“…Heavy metal poisoning will lead to many fatal diseases such as pulmonary edema, kidney failure, cancer. Especially, a high concentration of cadmium (Cd) and copper (Cu) can affect the nervous and skeletal system [1][2][3]. e content of heavy metal ions in drinking water is very low, maximum content of Pb: 0.05 mg/L; Hg: 0.006 mg/L; As: 0.01 mg/L; Cd: 0.003 mg/L; Cr: 0.05 mg/L; Mn: 0.1 mg/L; Cu: 2 mg/L following WHO standard [4].…”

Eco-Friendly, Green Packaging Materials from Akaganeite and Hematite Nanoparticle-Reinforced Chitosan Nanocomposite Films

“…In this work, we reinforced CH polymer films by hematite nanoparticles (HNPs) and akaganeite nanoparticles (ANPs) by developing polymer nanocomposites and investigated their properties in relation to advanced green packaging applications. Hematite and akaganeite nanoparticles were synthesized using naturally occurring widely distributed ferruginous laterites [31,32], and these nanoparticles were incorporated into CH by solution casting. The mor-phological, thermal, chemical, optical, and mechanical properties of synthesized nanocomposites were investigated using SEM, XRD, TGA, FTIR, UV-Vis-IR spectrometer, and tensile tester.…”