جستجوی مقالات مرتبط با کلیدواژه « Activated Carbon » در نشریات گروه « مواد و متالورژی »

Nowadays, due to the reduction of fresh water resources and the increase in demand in the world, the removal of various pollutants, such as dyes, from industrial wastewaters to reuse them has received much attention.

In this research, activated carbon (AC) was synthesized by the chemical activation of apricot kernel shell, and then, this adsorbent was modified by iron-containing functional groups (FeOOH-AC) and used as an adsorbent in the removal of methyl orange from the aqueous solution. The properties of these adsorbents were characterized using BET, SEM, XRD, and FT-IR analyses.

The matching of the equilibrium data with the Langmuir model showed that the adsorption process is single-layer and the maximum adsorption capacity of AC and FeOOH–AC absorbents equal 174.6 mg/g and 249 mg/g, respectively. The increase in adsorption capacity after modification is due to the positive adsorption sites of iron (Fe-O-H2+) on the surface of the modified adsorbent, which adsorb the methyl orange by electrostatic mechanism. Also, the physical adsorption due to the porous structure of the adsorbent and π-π interaction are the effective mechanisms in the adsorption of methyl orange on the FeOOH-AC adsorbent. The analysis of kinetic data with different models showed that the pseudo-second-order kinetic model is consistent with the experimental result. The spontaneity and exothermic nature of the adsorption process were determined by determining the thermodynamic parameters.

The successive cycles of adsorption and desorption indicate the ability to regenerate and reuse the synthesized adsorbent, which can be a suitable option for use on the industrial scale.

Due to the increase in population and industrial activities, the demand for clean water has increased. On the other hand, the amount of fresh water has decreased; As a result, wastewater treatment, including municipal and industrial wastewater, has become very necessary. One of the wastewater treatment methods is the Advanced Oxidation Process (AOP). This research used the advanced oxidation process using the photo-catalyst based on modified activated carbon to treat municipal wastewater in Yasouj City. Activated carbon was prepared from the walnut shell using the chemical activation method and then modified by a composite of ZnO and SnO2 nanoparticles and used as a photo-catalyst in the designed reactor for wastewater treatment. The results of FTIR, XRD, and EDX analyses confirmed the presence of ZnO/SnO2 nanoparticles on the modified activated carbon surface. Due to the coating of these nanoparticles on the surface of the activated carbon and inside its pores, the specific surface area of the modified activated carbon is greatly reduced compared to the activated carbon. The results of the DRS analysis show the low band gap of the synthesized photocatalyst and its applicability in the presence of visible light. To optimize the effect of the parameters, the central composite design method was used to design the experiment. The results showed that the maximum amount of COD reduction of 97.41% has been achieved at a pH of 3, the amount of photocatalyst of 1.25 g/L, and the duration of light irradiation of 45 minutes.

Rice husk (RH) is considered as the starting material for synthesis of materials such as silicon carbide. The use of this material as a low-cost resource for production of low-cost and high capacity anode materials is becoming a trend due to the availability of this material on a worldwide scale. Following this trend, this manuscript focuses on the synthesis of activated carbon (AC) from rice husk. Activated carbon was synthesized by pyrolysis of RH under air atmosphere at 400 C for 2 hours followed by NaOH treatment and heating to 800 C for activation. Formation of the activated carbon was confirmed through XRD measurements. Products were characterized morphologically. A mesoporous structure with a high surface area of 580 m2.g-1 (determined through BET measurements) is formed. Detailed analysis discloses the fact that the pore size is in the range of hundreds of nanometers to about one micron which makes the material suitable for application in lithium-ion batteries.

In this research, synthesis procedure of activated carbon (AC) was optimized from pistachio waste in order to maximize the COD (Chemical Oxygen Demand) removal from nitro hydroxyl-terminated polybutadiene (nitro-HTPB) resin production unit wastewater through a batch system. For this purpose, Response Surface Methodology (RSM) was applied to optimize the effective factors in AC synthesis preparation condition including impregnation ratio, carbonization temperature, and activation time. The optimal conditions for impregnation ratio by phosphoric acid, carbonization temperature, and activation time were 2.76, 524.34°C, and 38.04 min, respectively. It was obtained that, the as-synthesized AC (in accordance with the proposed condition set) is able to remove 90% of COD. The study shows that the “Freundlich isotherm” model was consistent with the results. Moreover, FT-IR and FESEM analysis were used to characterize bonds and surface morphology respectively.