Only 14 pages are availabe for public view
This thesis entitled with ”Preparation and characterization of some nanomaterials for waste water treatment and their use in chemical sensors for environmental pollutants monitoring” includes six chapters.
This chapter is divided into two parts: part (A) deals with general background, characterization and applications of nanomaterials, part (B) includes the basic principles, historical background, classifications, selectivity, applicability, some strategies used in fabrication and application of potentiometric sensors.
This chapter describes the synthesis of a new SnO2/CeO2 nano-composite sample and itscharacterization to be used for the removal of alizarin dyes from aqueous solutions. The composite material was prepared using a co-precipitation method. Under optimized experimental conditions, the removal of alizarin yellow, alizarin red and alizarin-3-methylimino-diacetic acid dyes from aqueous solutions was about 96.4% ,87.8% and 97.3 %, respectively. The adsorption isotherms were agreed with Langmuir, Freundlich and Temkin isotherms.
In this chapter copper ferrite nanoparticles (CuFe2O4) and copper ferrite polyaniline nanocomposite (CuFe2O4/PAN) were synthesized using co-precipitation methodology and utilized as sorbent materials for the removal of total inorganic mercury. The Nanosorbents were characterized showing the formation of CuFe2O4 with 20.8 nm size. Several removal parameters for mercury have been studied and exhibited high performance with high removal percentage of up to 99 %. The adsorption isotherms were investigated using Langmuir, Freundlich and Temkin isotherms.
A potentiometric study using different thiocyanate sensors was conducted based on the use of Al (4-(2-pyridylazo) resorcinol) (Al/PAR) and Mg (II) phthalocyanine (MgPC) complexes as charged carriers. Copper (II) neocuproin/SCN- ion association complex, aliquate 336S and TDMAC were also used as ion exchangers in plasticized poly (vinyl chloride) membranes. The sensors exhibited near-Nernstian slopes of -45.9 ــــ -62.4 mV decade-1 for SCN- ions with detection limits of 0.25 ــــ 0.3 µg ml-1. The developed sensors were applied to determine the cyanide content in electroplating wastewater samples after conversion into thiocyanate.
New simple potentiometric sensing systems are described for the sensitive and selective monitoring of dimethylamine (DMA). The first system is based on using polymeric membranes doped with some ion exchangers such as dimethylamine/phosphomolybdate [(CH3)2NH2)2]2+ [PM]2- (Sensor I), dimethylamine/tetraphenylborate [(CH3)2NH2)]+[ TPB]- (Sensor II) and dimethylamine/phosphotungstate [(CH3)2NH2)]+[PT]- (Sensor III). The second system involves the fabrication of a molecularly imprinted polymer, with a pre-defined specific cavity suitable to accommodate DMA (Sensor IV). The sensors exhibit a stable, fast and linear response with near-Nernstian potential response to DMA+. Slopes of 53.2±0.4, 49.4±0.6, 53.8±0.3 and 51.3±0.3 mV decade−1 and detection limits of 2.0 x 10-6 (0.16 µg ml-1), 1.6 X 10-5(1.3 µg ml-1), 1.4 x 10-6 (0.11 µg ml-1) and 4.6 x 10-6 (0.37 µg ml-1) mol L-1 are obtained with sensors (I), (II), (III) and (IV), respectively. The sensors are satisfactory applied for DMA quantification in both biological matrixes and environmental samples with recoveries ranging between 95.0 and 102.0%.
This chapter deals with the development of novel biomimetic potentiometric membrane sensors for the assessment of aminoacridine (ACR). The membranes of sensors (I) and (II) consist of MIP based methacrylic acide (MAA) and acrylamide (AM), respectively. The sensors exhibit near-Nernstian potential response to ACR+ with slopes of 51.2±1.3 and 50.5±1.4 mV per decade and detection limits of 0.05 and 0.17 µg ml-1 for sensors (I) and (II) , respectively. The sensors are used for the assessment of aminoacridine in some pharmaceutical preparations and biological samples.