Vol. 6, Issue 5 (2018)
Capacity adsorbent of unmodified zeolite, zeolite@aunps and zeolite@aunps@met against razor blade factory and wells
Author(s): Nurdiani
Abstract: Many studies have been carried out to find an effective method for treating heavy metal waste, including chemical precipitation, ion exchange and reverse osmosis. These techniques are quite expensive and have several shortcomings, among others, which require a lot of reagents and produce toxic sludge or other waste products that require a separate exhaust system. The adsorption method is an easy and simple method for absorbing heavy metal ions. Zeolite can be used as an adsorbent for heavy metal ions because zeolite is a material that has a very regular crystal shape with cavities that are interconnected in all directions and makes the surface area of ​​zeolite very large so it is very good to be used as an adsorbent. Unmodified zeolite has a low adsorption capacity. Modifying compounds which are immobilized will be better if they prefer to bond with only one or several specific metal ions so that the adsorption occurs more selectively. This study modified zeolite with gold metal ions and gold metal ions which were successfully immobilized synthesized using binahong (Anredera cordifolia)leaf extract. The selection of gold nanoparticles is based on their inert nature and is not easily oxidized. The gold nanoparticles stabilizing agent is used by mercaptoethanol ligand because it has a thiol group (RSH) which has high affinity for gold metal ions.Nurdiani et al (2015) which successfully modified zeolite with gold nanoparticles (in situ synthesized with binahong leaf as reducing agent) and stabilized zeolite@AuNPs with organic substances mercaptoethanol acid ligands.The success of zeolite@AuNPs@ MET modification needs to be tested for its adsorption power. This has been done on Mn7+ ion solution and Fe2+ ion solution as well as in razor blade factory and well water. Furthermore, compared to the unmodified zeolite, zeolite with modification of gold nanoparticles, and modification of zeolite@AuNPs@ MET. The final step is to regenerate zeolite, zeolite@AuNPs and zeolite@ AuNPs@MET by using Na-EDTA so that all adsorbents can be reused as adsorbents.The adsorption capacity of zeolite@AuNPs@MET adsorbent is better than the unmodified zeolite and zeolite@AuNPs with adsorption capacity sequence for Mn7+ ions is zeolite@AuNPs@MET (0.664 mg/g) > unmodified zeolite (0.274 mg/g) > zeolite@AuNPs (0.229 mg/g), while for Fe2+ ions are zeolite@AuNPs@MET (0.815 mg/g)> unmodified zeolite (0.805 mg/g) > zeolite@ AuNPs (0.795 mg/g). The absorption optimum condition of zeolite@AuNPs@ MET with Mn7+ ion adsorption capacity of 0.39 mg/g and 0.41 mg/g Fe2+ ion was achieved in conditions of adsorbent weight of 0.10 grams, metal concentration of 5 mg/L and contact time 3 hours. Regeneration throughout the unmodified zeolite, zeolite@AuNPs, and zeolite@AuNPs@MET with Na-EDTA has been successfully carried out by order of the success of regeneration is unmodified zeolite > zeolite@AuNPs@MET > zeolite@AuNPs. The experimental data isothermal adsorption of Mn7+ ion and Fe2+ ion by a zeolite@AuNPs@MET tend to follow the Langmuir equation because the resulting coefficient of determination (R2) greater than Freundlich equation with the value of 0.990 for the manganese ion and 0.990 for ferrous ion.
Pages: 3089-3094 | 503 Views 108 Downloads
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How to cite this article:
Nurdiani. Capacity adsorbent of unmodified zeolite, zeolite@aunps and zeolite@aunps@met against razor blade factory and wells. Int J Chem Stud 2018;6(5):3089-3094.
