Removal Of Phenol From Aqueous Solution Using Duolite A 171

General Certificate of Secondary Education June 2007 SCIENCE B Unit Chemistry C1 CHEMISTRY Unit Chemistry C1 Higher Tier Thursday 21 June 2007 1.30 pm to 2.15 pm CHY1H

The authors are S. H. Abo El-Nor, H. M. Khattab,  S. M. Khalif, H. M. El-Sayed, O.H.

The book “The Periodic Table” by Primo Levi is undoubtedly a masterpiece. It showcases the enthusiasm, the level of dedication, and passion successful chemists such as Primo Levi himself had for the field of their expertise. The way Primo Levi has related the troublesome times and events he had to face in prospect with the elements of the periodic table is laudable. Primo Levi is surely an inspiration and a perfect example of prodigy and passion. Despite the challenges and the hardships inflicted on him by the bigoted group of Germens, he still managed to emerge as an exceptional chemist and an author who made great contributions to the modern chemistry as we now know it.

Prepared by: Marc Hemsin – 3386122 Juthakarn Jessica Suwanasilp – 3344346 Tu Lan – 3282178 Bo Qiu - 3308317

Zhang et al23 (2013) reported the removal of tetrabromobisphenol A (TBBPA) from aqueous solution by GO. The effects of contact time, pH, and temperature, and the presence of coexisting anions as well as humic acid, were studied through batch experiments. The adsorption capacity decreased with an increase in temperature as well as solution pH. The presence of coexisting anions such as NO-3 SO4 -2 −, HPO4 -2 and HCO 3 2- reduced TBBPA adsorption in the order NO3 - < SO4 2- < HPO4 2- < HCO3 2-The presence of humic acid also significantly reduced the adsorption of TBBPA onto GO. The adsorption reaction followed the pseudo-second-order kinetics, while the adsorption isotherm was well described by the Langmuir model with a maximum adsorption capacity of 115.77 mg g−1 at 298 K. Thermodynamic studies indicated that the adsorption of TBBPA onto GO was feasible and spontaneous at all temperatures and was exothermic in nature. Both π–π stacking interactions and hydrogen bonding were proposed to be responsible for the adsorption of TBBPA by GO.

P. Malairajan, G. Gopala Krishnan, S. Narasimhan, K. Jessika-laveni. Indian J Pharmacol. 40(3):126-128, 2008. 4. W.A. Boyd.

The pH of the media is considered to be one of the most important environmental factors affecting the biosorption process. Moreover, it affects the solubility of metals and ionization state of functional groups which includes carboxyl, phosphate and amino groups of cell wall (Wang and Sun 2013). The effect of pH on the biosorption of aluminium is presented in Fig. 2a. Results show that the amount of aluminium ion uptake increased (10 - 92 mg/L) by rise in pH values (2.0 – 6.0) and the maximum removal efficiency was observed at pH 6. At low pH (less than 4.0) heavy metal removal was inhibited, as a result of positive charge density on metal binding due to a high concentration of protons in solution. With an increase in pH, the negative charge density on the cell surface increases due to deprotonation of the metal binding sites and thus increases biosorption (Say et al. 2001). At alkaline pH, more Al appears in a

Owing to the standard limits of water, it generates a strong demand to improve the efficiency of existing methods for removing Pb and Zn from the water. Many techniques have been reported for the effective removal of hazardous heavy metals from aqueous solutions such as adsorption, flocculation, coagulation, membrane filtration, electrochemical operations, solvent extraction, bio-sorption, chemical precipitation, ion-exchange, as well as various other processes (6-7). However, most of these techniques have several disadvantages such as production of secondary pollution, high cost, high levels of energy and chemicals needed, and weak treatment operation at low metal concentrations. (8-9). Adsorption is now recognized as an effective and economic method for heavy metal wastewater treatment. The adsorption process offers flexibility in design and operation and in many cases will produce high-quality treated

PBX simulated wastewater before and after the ozone oxidation was extracted thrice with dichloromethane. The obtained dichloromethane extract was dried over anhydrous sodium sulfate and then analyzed using an Agilent Technologies 7890A-5975C Gas Chromatography-Mass Spectrometry (GC/MS) (Agilent Technologies, America) for the final product analysis of gas phase system. Approximately 1.5 mL sample was heated from room temperature to 330 °C and kept at this temperature for 15 s. The chromatographic separation was performed using a 3 m 250 um 0.25 um HP-5MS elastic quartz capillary column with the following program: the initial temperature was 40 °C and increased to 100 °C at a rate of 5 °C/min, then further increased from 100 °C to 280 °C at a rate of 15 °C/min, from 280 °C to 330 °C at a rate of 30 °C/min. The mass data were obtained at the ion source temperature and the detector voltage of 230 °C and 70 eV, respectively. The mass scan ranged from 20 u to 500 u.

Jith, Vishnu | Chemistry June | QuizStar Chemistry Main Your score: 9 out of 25 (36%) [Within Time limit] Quiz Attempts: 1 Your Responses: An arrow next to the choice marks the correct answer 1. Q1. [1 pts.] 0.041 0.014 0.31 correct answer choice 0.12

A strong desire to achieve my aspiration coupled with my interest in science field enabled me to secure admission in undergraduate program in science (Chemistry) from Mithibai College in Mumbai University, which is one of the top ten colleges in Mumbai, India. My genuine interest in chemistry brought me an award in "Srujan" project (Neutron Activation Analysis) associated with Nehru Science Center. The project edified my mind with practical knowledge and expertise in TLC, Crystallization, NMR, Spectroscopy (UV, Visible and IR), Chromatography (HPLC and Gas) and stereochemistry.

CHEMISTRY Paper 2 Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name in the spaces at the top of this page. Write in dark blue or black pen. You may need to use a pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. A copy of the Periodic Table is printed on page 20. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end

I believe the current manuscript holds the merit to be published in a high-quality journal, and my recommendation is to accept the manuscript to be published in Chemistry of Materials.

Chitresh Lodhi1, Kaushal K. Sharma2, Akshay Gupta3 123Oriental College of Technology, Patel Nagar Raisen Road, Bhopal (M.P)

Organization of the author(s): Mechi Multiple Campus, Bhadrapur, Jhapa, Nepal; Post Graduate Campus, Biratnagar, Nepal