Copper (Cu(II)) is a very toxic heavy metal that even at low concentration can affect living organisms. Therefore, designing effective materials with high selectivity and cost-efficiency is essential for the control capturing of toxic Cu(II) ions. This study was developed a ligand based composite material for simultaneous Cu(II) detection and removal from wastewater samples. The composite material was fabricated based on the ligand anchoring onto the mesoporous silica by direct coating approach. The application of Cu(II) detection and adsorption was measured at neutral pH region with exhibition of significant color visualization. The experiment conditions were optimized based on contact time, solution acidity, initial Cu(II) concentration and pH value and diverse metal salt concentrations. The results were revealed that the composite material was not affected with the existing foreign ions and the signal intensity was observed only toward the Cu(II) ion. The composite material was able to detected the low level Cu(II) ion as the detection limit was 0.25 μg/L and the adsorption of highest removal capacity was 171.33 mg/g. In addition, the diverse ions were not reduced the Cu(II) ion adsorption significantly, and the composite material has approximately no adsorption capacity for other ions at this pH. The elution of Cu(II) ions from the saturated composite material was desorbed successfully with 0.20 M HCl. The regenerated adsorbent that remained maintained the high selectivity to Cu(II) ions and exhibited almost the same sorption capacity as that of the original adsorbent. However, the sorption efficiency slightly decreased after ten cycles. Therefore, the proposed material offered a cost-effective material and may be considered a viable alternative for effectively toxic Cu(II) ion capturing from water samples without the need for sophisticated instrument.

Novel ligand functionalized composite material for efficient copper(II) capturing from wastewater sample

Innovative composite material for efficient and highly selective Pb(II) ion capturing from wastewater

Novel conjugated hybrid material for efficient lead(II) capturing from contaminated wastewater.

Novel composite material for selective copper(II) detection and removal from aqueous media

A novel ligand based conjugate material (CMA) was prepared for toxic lead (Pb(II)) ion monitoring and removal from aqueous solution. The organic ligand of 6-((2-(2-hydroxy-1-naphthoyl)hydrazono)methyl)benzoic acid was successfully synthesized and then anchored onto the porous silica monolith. The CMA was enhanced the color upon addition of Pb(II) ion and the results were the evident of the one-step monitoring of wide-range Pb(II) concentrations without using the highly sophisticated apparatus, and this was unique feature of the CMA. The limit of detection was 0.42 μg/L, which was the lower than the permissible limit in drinking water. Varying factors that may affect the Pb(II) removal efficiency such as solution pH, reaction time and coexistent metal ions were systematically investigated. The data was clarified that the developed CMA was removed more than 99% of Pb(II) ion from aqueous solution under the optimum experimental protocol. The maximum adsorption capacity for CMA was 196.35 mg/g. The adsorption data were well fitted to the Langmuir isotherm model and confirmed the monolayer coverage as desired from the CMA morphology. The CMA was exhibited the high affinity to the Pb(II) in the presence of high concentration competing ion. In addition, the adsorbed Pb(II) was desorbed from the CMA with stripping agent (0.10 M HCl) and simultaneously regenerated into an initial form for the next monitoring and removal operations after washing with water. Based on the experiment results, it is concluded that the CMA is highly sensitive and selective material for efficient water treatment for supplying the pure drinking water.

Nabeel H. Alharth

Papers

Composite nanofibers membranes of poly(vinyl alcohol)/chitosan for selective lead(II) and cadmium(II) ions removal from wastewater.