الفهرس 
Introduction and Literature reviewOnly 14 pages are availabe for public view
 |  | from | 283 |  |  |
| | | from | 283 | | |
Abstract
The aim of current thesis is preparation of optical chemsensors and adsorbent based on metal-organic frameworks for sensing and trapping of toxic heavy metals and dyes in environmental applications. The thesis is divided to three chapters and pronounced as follows:
Chapter I: Introduction and Literature Review
In chapter I, general introduction, and literature review about the main objectives of my work in this thesis were discussed and investigated. Moreover, the fabrication of optical nanosensors and adsorbent based on nanoporous carriers and its advantage in modern analytical techniques. A literature review on the measurement of heavy metals such as Hg2+ ions using microporous chemosensors and adsorption of MG dye were discussed.
Chapter II: Experimental Work
In chapter II, different experimental techniques that have been employed to study the structure, spectral characterization of optical nanosensors and adsorbent were completed demonstrated. Furthermore, the fabrication methods of optical nanosensors and adsorbent were completed studied.
Chapter III: Results and discussion
This chapter is divided to two parts as follows
In part 1, the TAM optical chemosensors based on nanorods Al-MOFs has a significant fruitfulness for monitoring and trapping of Hg2+ ions. The optical chemosensors were designed by direct immobilization process of (bis(4-(dimethylamino)phenyl)methanethione) into microporous nanorods of Al-MOFs. At optimal sensing conditions our findings investigate that the TAM- nanorods can identify Hg2+ ions in existence of common ions. The sensitivity of our fabricated TAM optical chemosensors toward mercury ions was obtained (0.8 ppb) to be lower than the allowed limits in water. The superior removal characteristics of the fabricated TAM adsorbent were investigated and showed a high adsorption capacity (1110 mg/g). Furthermore, the TAM removal capacity illustrates a great advantage to be applicable for capturing of mercury ions. The naked-eye color development of TAM-Hg2+ complex gave an additional in simultaneous colorimetric detection of Hg2+ ions without utilizing complicated methods. Moreover, TAM chemosensors can be used for several times with high efficiency because of the long-range stability advantage. Our results demonstrated that the fabricated TAM optical chemosensors have a great potential on visualizing and trapping of Hg2+ ions in water samples, and skin whitening products.
In part 2, the poisonous dyes were released in massive quantity with indirect ways in water which have drastically affected in the environment. Thus, removal of dyes from industrial wastewater using eco-friendly approach using inorganic-organic zinc frameworks were investigated. In this report, a room temperature and one-pot fabrication of dice nanocube inorganic-organic Zn-MOFs for removal of aquaculture Malachite green dye (MG) with superior adsorption capacity in wastewater samples was investigated. The dice nanocube with intergrowing chain with high accessible surface area, and uniform micropore allow for trapping MG from wastewater sources. The inorganic-organic frameworks with nimble building and dynamic performance showed significantly high adsorption capacity for MG. The adsorption operational key factors such as pH of solution (i.e., pH=9) plays a significant role in generation of actively negative surfaces along the entire nanocube Zn-MOFs adsorbent, so generating microporous surfaces with strong binding ability to interact and uptake Malachite green dye (MG). The high removal capacity of nanocube Zn-MOFs in removal of MG (953.14 mg•g−1) was demonstrated. The removal of bio-staining MG dye with superior adsorption efficiency was retained even after multiple reuse cycles. The microporous dice nanocube Zn-MOFs adsorbent allow for water purification and management of industrial wastewater with simple and effective model. To the best of our knowledge, the first-time usage of Zn-MOFs adsorbent for removal of Malachite green dye (MG) in wastewater samples.