Adsorption of Reactive Yellow-145 Dye on Iraqi Date Palm Seeds Activated Carbons Falah H. Hussein, Abbas J. Lafta, Ahmed F. Halbus, Zaineb S. Burhan, Hussein A. Fenoon. Chemistry Department, College of Sciences, Babylon University, Hilla, Iraq. Introduction In the last few decades, activated carbon, sometimes also known as activated charcoal, or activated coal is considered as a type of carbon that is processed by physical methods or/and chemical methods.(1) As a result of its high microporosity with a high surface area, it can be used as a good adsorbent for wide range of adsorbates. Many attempts have been done by researchers to synthesis low cost ACs or adsorbents from widely available agricultural wastes such as coconut shells. Generally, ACs is widely used as an adsorbent for many materials, especially polluted materials in wastewater, industrial water, and some of air pollutants (11). However, ACs is cheap, not toxic, high availability and can be recovered for further usage. Activated carbons can be used efficiently in gas purification, decaffeination, gold purification, metal extraction, water purification, air filters in gas masks and many other applications. In terms of industrial applications of ACs, is the metal finishing field, it is widely used for purification of electroplating solutions. In terms of analytical chemical applications, it can be used in combination with celite, it uses as a stationary phase in case of low pressure chromatographic isolation of carbohydrates Method Iraqi dates palm seeds zahdi date seeds were used as starting materials to prepare the ACs. For all samples, seeds were washed with hot distilled water to remove dust and others wastes, then dried at 110 ºC for two hours. Then these materials were mixed with the desired activator in appropriate ratio in a chemical activation process. Then activation processes was performed by heating at 700 ºC in a graphite furnace for one hour under nitrogen atmosphere. After heating, all the samples were cooling to room temperature and the resulted ACs washed again with distilled water until pH of the washing solution becomes around 7. Then the product was derided again at 110 ºC for two hours. Adsorption studies: Many adsorption studies were investigated in this study in order to determine effects of different parameters that influence adsorption processes. In this context, all adsorption tests were conducted in a magnetic stirrer at temperatures ranged from 15–30 ºC. Adsorption processes were performed using a concentration of the used dye which was reactive yellow equal to 10 ppm. The adsorbent was loaded in different masses in 100 mL of aqueous solution of the dye, these masses are: 0.01, 0.05, 0.10, 0.15, 0.20 g. Periodically 2 mL of the solution were withdrawn from the reaction mixture, then centrifuged and the absorbance recorded at a wavelength of 416 nm. Absorbance was measured using 1650 PC-UV-visible Spectrometer Shimadzu. Adsorbate: Dispersed dye, reactive yellow (C18H14Cl2N8Na2O9S2), this dye would be used as an adsorbate model in this study, it used as it was provided without any further purification. Distilled water was used to prepare all the solutions and reagents in this work. The chemical structure of this dye is shown bellow: Figure -1: Schematic description of reactive yellow -145 dye. (Copied from dye) Results and Discussion References 1- N. Aukett, N. Quike, S. Riddiford, and R. Tennison, Carbon, 30, , J. Laine, A. Calafta, and M. Labady, Carbon, 27, 191, F. Rodriguez, and M. Sabio, Carbon, 30, 1111, N. Gergova, and N. Eser, Carbon, 32, 693, C. Lousier, C. Shull, and J. Miller, Carbon, 32, 1493, C. Anuar, G. Faujan, Z. Zobir, and M. Halim, Malay. J. Anal. Chem., 18, 1, C. Anuar, G. Faujan, B. Zulkarnain, Z. Zobir, and M. Halim, Res. J. Chem. Env., 5, 3, C. Anuar, G. Zulkarnain, Z. Zobir, M. Halim, and M. Haron, J. Sci. Tech., 20, 2, Figure-3: Effect of contact time on the removal of the dispersed RY-145 dye by using ACZID with KOH. Figure-2: Effect of contact time on the removal of the dispersed RY-145 dye by using non-ACZID Figure-4: The linear Freundlich adsorption isotherms for reactive yellow adsorption by the AC.. Conclusions: Activated carbons that were synthesized in this study can be used as an efficient adsorbent for many applications. The efficiency of removal of the dispersed reactive yellow dye for activated carbon with KOH was much better than for non-activated samples. The synthesized materials showed high external surface areas which make them as good adsorbent materials. Beside that they showed low ash content with relatively high moisture content. These properties are considered as encouraging physical properties for these materials to be used as adsorbent material. Adsorption isotherm studies showed that they are fitted with Langmuir model. Figure-5: The linear Langmuir adsorption isotherms for reactive yellow adsorption by the AC. Abstract: In the present study, synthesized of activated carbons (ACs) from different Iraqian zahdi date seeds (ZDS) was performed. Preparation of ACs was undertaken by chemical activation according to this method the raw material was impregnated with the activator. Then, raw material was derided and carbonized at 700 ºC under N2 flush for one hour. Kinetics of adsorption and removal of reactive yellow (RY) as a model of the polluted dyes were investigated from batch tests. Different reaction conditions were investigated, such as mass loading of ACs, and contact time. Both of Langmuir and Freundlich adsorption isotherms were performed for each case. In terms of physical properties each of external of surface area of ACs, ash content, and humidity of ACs were investigated