Simultaneous adsorption of Hg ²⁺ , Cd ²⁺ and Cu ²⁺ ions from aqueous solution with mesoporous silica/DZ and conditions optimise with experimental design: kinetic and isothermal studies

Abstract

This study used dithizon (DZ) and mesoporous as a sorbent for simultaneous removal of heavy metal (mercury, cadmium and copper) ions from aqueous solution and real samples. Santa Barbara Amorphous synthesised and characterised by X-ray diffraction, Fouriertransform infrared spectroscopy and Brunauer-Emmett-Teller. Heavy metal ions measured by atomic absorption spectrometry and inductively coupled plasma optical emission spectrometry. Optimised conditions such as pH, removal time, sorbent dosage and concentration analyte with central composite design and obtained 5, 20 min, 20 mg and 25 ppm, respectively. The equilibrium data were fitted to isotherm models such as Langmuir, Freundlich and Tempkin and the results revealed the suitability of the Langmuir model. The maximum adsorption capacities for Hg 2+ , Cd 2+ and Cu 2+ ions achieved 25.04, 30.3 and 31.79 mg/g, respectively. Kinetics data fitting to pseudo-first order, pseudo-second-order and Elovich models confirmed the applicability of pseudo-second-order kinetic model for the description of the mechanism and adsorption rate. This sorbent could regenerate easily with ethylenediamminetetraacetate solution.

Response surface methodology (RSM) for optimization of cadmium ions adsorption using C16-6-16 incorporated mesoporous MCM-41

“…Response Surface Methodology (RSM) is used for optimizing the adsorption conditions of cadmium ions by G-MCM-41. RSM analyze the interactions between the independent variables and response [20,21]. The effect of different physiochemical parameters such as pH, heavy metal ion initial concentration and contact time was examined using Box-Behnken design (BBD).…”

Process Optimization for Acid Hydrolysis and Characterization of Bioethanol from Leftover Injera Waste by Using Response Surface Methodology: Central Composite Design

“…Acid hydrolysis has a good reproducibility compared to other methods; it is very common and cheapest if compared with the other methods of the hydrolyzing process [ 17 ]. The 5-level 3-factor (i.e., temperature, acid concentration, and hydrolyzing time) experiment was designed by the central composite design (CCD) method using a Design-Expert (version 11) [ 18 ]. Experiments were conducted according to the designed process conditions.…”

Sulfhydryl functionalized carbon quantum dots as a turn-off fluorescent probe for sensitive detection of Hg2+

“…3,4 Therefore, it is of great signicance to establish a highly selective and sensitive detection method for Hg 2+ . There are many traditional methods for the determination of Hg 2+ , such as atomic absorption spectrometry (AAS), 5 anodic stripping voltammetry (ASV), 6 inductively coupled plasma atomic emission spectrometry (ICP-AES), 7 inductively coupled plasma mass spectrometry (ICP-MS), 8 liquid chromatograph-mass spectrometry (LC-MS) 9 and other sophisticated methods. However, expensive and complex instruments, a lengthy process and procedures for pre-treatment of complex samples all limit the application of these methods.…”