Doped silver nanoparticles on carbon fly ash for adsorption of methyl tertiary butyl ether
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example 1
Chemicals
[0046]The MTBE used in various embodiments of the present invention was purchased from Sigma-Aldrich, Saudi Arabia, with 99.999% purity (HPLC grade). Deionized water from Mili-Q direct purification system was used for preparation of 100 ppm MTBE stock solutions, from which water was spiked prior to treatment. Silver nitrate (AgNO3) from Eurostar Scientific Company was used as sources of the silver nanoparticles, ethanol from Sigma-Aldrich with 99.8% purity and nitric acid from LOBA Chemic PVT Ltd were also utilized in the embodiments described herein.
example 2
Preparation of Adsorbent Materials
[0047]The fly ash used in this study was obtained from a local power generating plant that has been collected by electrostatic precipitator during the burning of heavy liquid fuel. The raw fly ash was treated with nitric acid in the volume ratio of 1:3 (ash: nitric acid). The mixture was stirred for 24 hrs at 120° C., with an attached condenser. Segregation of phases was ensured by allowing the mixture to stand for 2 hrs, after which the acid was decanted and the slurry phase was washed with deionized water. The washing process was repeated until the pH of the waste water reached the level of that of the original deionized water used. Subsequently, the slurry phase was oven dried at 100° C. for 24 hrs and stored until used for the batch experiments.
[0048]A 10% (by mass) silver nanoparticle doping was carried out using silver nitrate (AgNO3) as source. Subsequently, 90% carbon fly ash of total mass was added and soaked in ethanol. Sonication of the m...
example 3
Adsorption Experiments
[0049]Each of the batch experiments was carried out in a 125 mL conical flask with a Parafilm sealing membrane. For each of the experiments appropriate amount of the adsorbent materials and 100 mL of 1000 ppb initial concentration MTBE spiked solution were added to the conical flask. Blank experiments were conducted to assess the loss of adsorbate to the flask and environment during the sorption process. Different dosages of the adsorbent materials, ranging from 10 mg to 100 mg were used for the sorption tests. A mechanical shaker was used for generating contact in the flask at varied agitation speeds (50 to 200 rpm) and contact time from 1 to 5 hrs. Duplicate 1.0 mL water samples were collected at one hour interval for 5 hrs in a glass vial and analyzed for MTBE concentration using GC / MS system. A gas chromatography coupled with ISQ single quadrupole mass spectrometer system, fitted with a Triplus headspace injector unit and an auto-sampler was used. A fused s...
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