scholarly journals KESETIMBANGAN ADSORPSI ISOTERMIS LOGAM Cr (VI) PADA FLY ASH

2021 ◽  
Vol 6 (2) ◽  
pp. 39
Author(s):  
Saripah Sobah ◽  
Fitria Fitria ◽  
Yano Hurung Anoi ◽  
Diana Diana ◽  
Precast Octavianus
Keyword(s):  
Fly Ash ◽  
Langmuir Equation ◽  
Atmospheric Conditions ◽  
Adsorption Time ◽  
Average Efficiency ◽  
Optimal Weight

The Purpose of this study was to determine the optimum adsorption time of fly ash from the PT. Pupuk Kaltim in adsorbing Cr metal, optimal stirring speed, and optimal weight of fly ash under isothermic conditions in batches using the Langmuir equation has been carried out at atmospheric conditions, temperature 27oC. Fly ash varies in weight and stirring speed. The filtrate was added with 2 mL of 0.1% NH4Cl after equilibrium, then analyzed using AAS AA-7000. The optimal adsorption time of fly ash in adsorbing Cr metal is 60 minutes. The optimal adsorption weight of fly ash is in 50 mL of Cr solution is 2 grams with an average efficiency value of 91.22%. The optimum stirring speed of fly ash to adsorb Cr metal is 200 rpm. Keywords: isothermic adsorption, fly ash, Cr metal

scholarly journals Influence of micro- and nanofiller contents on friction and wear behavior of epoxy composites

2017 ◽  
Vol 24 (4) ◽  
pp. 485-494 ◽  
Author(s):  
Iskender Ozsoy ◽  
Adullah Mimaroglu ◽  
Huseyin Unal
Keyword(s):  
Fly Ash ◽  
Friction And Wear ◽  
Filler Content ◽  
Wear Behavior ◽  
Tribological Performance ◽  
Epoxy Composites ◽  
Atmospheric Conditions ◽  
Wear Rates ◽  
Pin On Disc ◽  
Worn Surface

AbstractIn this study, the influence of micro- and nanofiller contents on the tribological performance of epoxy composites was studied. The fillers are micro-Al2O3, micro-TiO2, and micro-fly ash and nano-Al2O3, nano-TiO2, and nanoclay fillers. The microfillers were added to the epoxy by 10%, 20%, and 30% by weight. The nanofillers were added to the epoxy by 2.5%, 5%, and 10%. Friction and wear tests were conducted using the pin-on-disc arrangement. Tribo elements consisted of polymer pin and DIN 1.2344 steel counterface disc. A load value of 15 N, a sliding speed of 0.4 m/s, a sliding distance of 2000 m, and dry atmospheric conditions were applied to test conditions. The results show that the friction coefficients and the specific wear rates of the nanofilled composites increase as the filler content increases. For microfiller-filled epoxy composites, these values decrease as filler content increases. The tribological performance of epoxy composites is enhanced by the addition of microfillers, and the higher enhancement is reached with the addition of 30% fly ash filler. Finally, the pin and disc worn surface images show the presence of adhesive and some abrasive wear mechanisms.

Research on Adsorption and Discolor of Dyes on the New Wastewater Purifying Agent Named Granulated Fly Ash

2012 ◽  
Vol 518-523 ◽  
pp. 801-806
Author(s):  
Wen Jie Jin ◽  
Ying Liu ◽  
Han Xue ◽  
Fan Chao Zeng
Keyword(s):  
Fly Ash ◽  
Kinetic Equation ◽  
Organic Dyes ◽  
Langmuir Equation ◽  
Isotherm Models ◽  
Adsorption Model ◽  
Film Diffusion ◽  
Freundlich Equation ◽  
Adsorption Isotherm Models ◽  
Control Step

The new purifying agent named granulated fly ash was used to absorb the organic dyes-ethylene blue, direct red 12B and reactive brilliant orange X-GN in solution in this paper. The effects of dosage, temperature and pH on adsorption and discolor were separately studied. In addition, the adsorption model was also analyzed. Experiment results showed that adsorption isotherm models of ethylene blue and direct red 12B on the new agent conformed to Freundlich equation, and reactive brilliant orange X-GN conformed to Langmuir equation; The adsorption kinetics models of ethylene blue, direct red 12B and reactive brilliant orange X-GN on the new agent conformed to pseudo-secondary kinetic equation, liquid film diffusion was the main control step for adsorption of the three dyes.

Study on the Adsorption Performance of Zn(II) over Bentonite

2013 ◽  
Vol 575-576 ◽  
pp. 276-279
Author(s):  
Guo Xiang Pan ◽  
Ya Jing Zhang ◽  
Da Gan Chai ◽  
Yan Fei Yu
Keyword(s):  
Kinetic Equation ◽  
Adsorption Capacity ◽  
Adsorption Mechanism ◽  
Ph Value ◽  
Langmuir Equation ◽  
Adsorption Time ◽  
Adsorption Performance ◽  
Initial Ph ◽  
Increasing Process ◽  
Adsorption Activation Energy

Bentonite is applied in the simulative waste water containing Zn (II) ions in this paper, and the influences of initial pH value, temperature, adsorption time, Zn (II) concentration on the adsorption performance have been tested, and thermodynamic and kinetic equation are fitted. The results show that Zn (II) adsorption capacity increases firstly and then tends to balance as the pH increases. The higher the temperature is, the better adsorption capacity is. Zn (II) adsorption occurs within 60 minutes. Langmuir equation is used to fit adsorption thermodynamic equation, which indicates that the adsorption can occur spontaneously, and it is an endothermic and entropy increasing process. In addition, a kinetic equation is more suitable for the description of Zn (II) adsorption mechanism, and adsorption activation energy calculated is 6.90 kJ/mol.

scholarly journals KESETIMBANGAN ADSORPSI ISOTERMIS LOGAM FE (II) PADA ARANG TONGKOL JAGUNG

2020 ◽  
Vol 5 (2) ◽  
pp. 58
Author(s):  
Saripah Sobah ◽  
Adam Adam ◽  
Joko Triyatno ◽  
Yano Hurung Anoi
Keyword(s):  
Contact Time ◽  
Langmuir Equation ◽  
Atmospheric Conditions ◽  
Corn Cob ◽  
Absorption Time ◽  
Effect Of Ph ◽  
Magnetic Stirrer ◽  
Equilibrium Data

The purpose of this study was to determine the optimum absorption time of corn cob charcoal in absorbing Fe (II) ions, and the effect of pH of the solution on Fe concentration was absorbed in batch isothermic conditions using the Langmuir equation. The study was carried out under atmospheric conditions, temperature 27oC. A total of 0.6 g of char is added to 50 ml of Fe solution with various concentrations and then stirred using a magnetic stirrer at a speed of 150 rpm. Equilibrium data is taken after the process last for 24 hours, while to determine the contact time is selected at 5, 10, 15, 20, and 25 minutes. The optimum absorption time of corn cob charcoal in absorbing Fe (II) ions is 20 minutes. The amount of Fe absorbed increases with increasing pH.

scholarly journals Comparative evaluation of iron leach from different sources of fly ash under atmospherically relevant conditions

2016 ◽  
Vol 13 (5) ◽  
pp. 902 ◽  
Author(s):  
Jaya Borgatta ◽  
Amanda Paskavitz ◽  
Deborah Kim ◽  
Juan G. Navea
Keyword(s):  
Fly Ash ◽  
Atmospheric Aerosols ◽  
Power Plants ◽  
Source Region ◽  
Combustion Process ◽  
Atmospheric Conditions ◽  
North East India ◽  
North East ◽  
The Usa ◽  
Different Sources

Environmental contextIron, a limiting nutrient of plankton in the ocean, is deposited to the sea from atmospheric aerosols. In particular, atmospheric acidic conditions promote dissolution of iron from fly ash, a by-product of coal-fired power plants. Here, we report that the iron leached from fly ash depends on its source region, and that the type of combustion process may influence the iron species mobilized. AbstractFly ash, an iron-containing by-product of coal-fired power plants, has been observed in atmospheric aerosol plumes. Under the acidic atmospheric conditions resulting from the uptake of atmospheric gases, iron leached from fly ash can impact global biogeochemical cycles. However, the fly ash source region, as well as its generating power plant, plays an important role in the amount, speciation and lability of iron. Yet no comparative studies have been made on iron leached from fly ash from different sources. This study reports the iron mobilisation by proton-promoted dissolution from well-characterised fly ash samples from three distinctive locations: the USA Midwest, north-east India and Europe. In addition, pH dependency was also investigated. Proton-promoted dissolution showed a variability between source regions with a relative iron leach in the order USA Midwestern>north-east Indian>European ash. In addition, the initial rate of iron leach suggests that source region is indeed a determining factor in the iron leaching capacity of fly ash, because dissolution from Midwestern fly ash is also faster than both European and Indian ash. Finally, the combustion process of fly ash proved to be significant for the iron speciation, given that well-combusted fly ash samples leached mostly Fe3+ rather than bioavailable Fe2+. The role of fly ash should therefore be taken into account in order to better understand the effects of combustion particles in atmospheric iron deposition.

Study on Removal of Phosphorus from Domestic Wastewater by Modified Fly Ash

2011 ◽  
Vol 396-398 ◽  
pp. 2294-2299 ◽  
Author(s):  
Rui Gang Wang
Keyword(s):  
Fly Ash ◽  
Removal Efficiency ◽  
Phosphorus Removal ◽  
Ph Value ◽  
Particle Diameter ◽  
Domestic Wastewater ◽  
Adsorption Time ◽  
Modified Fly Ash

To prevent eutrophication and to treat domestic wastewater effectively, the experiment of removing phosphorus from domestic wastewater was carried out using modified fly ash as an absorbent. The effects of fly ash particle diameter, fly ash dosing quantity, pH value, temperature, oscillating strength and adsorption time on phosphorus removal were studied. The results showed that when the fly ash size ranged from 160 mesh to 200 mesh, the fly ash dosing quantity was 25g/L, pH value was 3.5, the temperature was 50°C, the concentration of phosphorus in the domestic wastewater was 6.0 mg/L, the oscillating strength was 140r/min, and the adsorption time was 120 minutes, the removal efficiency of phosphorus could reach 94.5% and the concentration of phosphorus could reduce to under 0.5 mg/L.

scholarly journals Study on Adsorption of Dye Wastewater by Modified Fly Ash

2021 ◽  
Vol 267 ◽  
pp. 02020
Author(s):  
Yanping Qu ◽  
Dongqing Yan ◽  
Rushuang Su ◽  
Wenshuo Hu ◽  
Yanyan Dai
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Methyl Orange ◽  
Dye Adsorption ◽  
Raw Material ◽  
Dye Wastewater ◽  
Adsorption Time ◽  
Decolorization Rate ◽  
Methyl Orange Dye ◽  
Modified Fly Ash

Used fly ash as raw material, it was modified by acid, alkali and high temperature to produce modified fly ash adsorbent, sulfuric acid modified fly ash adsorbent, sodium hydroxide modified fly ash adsorbent and high temperature modified fly ash adsorbent. In this paper, the effects of adsorbent dosage, adsorbent adsorption time, initial dye concentration, wastewater pH and temperature on dye adsorption were studied. The results showed that: the acid modified fly ash adsorbent had a good treatment effect on the dye; when the dosage of fly ash was 1.00 g, the adsorption time was 90 min, the pH of wastewater was 4, and the temperature was 45 °C, the decolorization rate of 60 mg/L methyl orange dye can reached more than 70%; when the dosage of fly ash was 0.20 g, the adsorption time was 60 min, the pH of wastewater was 3, and the temperature was 35 °C, the decolorization rate of 20 mg/L methyl orange dye can be achieved. The decolorization rate of Congo red can reached more than 80%.

scholarly journals PENINGKATAN KADAR GLISEROL HASIL SAMPING PEMBUATAN BIODIESEL DENGAN METODE ADSORPSI ASAM LEMAK BEBAS (ALB) MENGGUNAKAN FLY ASH

Konversi ◽  
2013 ◽  
Vol 2 (2) ◽  
pp. 1
Author(s):  
Mardhiyah Nadir ◽  
Marlinda Marlinda
Keyword(s):  
Fatty Acids ◽  
Fly Ash ◽  
Free Fatty Acids ◽  
Adsorption Capacity ◽  
Crude Glycerol ◽  
Maximum Adsorption Capacity ◽  
Adsorption Time ◽  
Adsorption Processes ◽  
Capacity Data ◽  
Langmuir And Freundlich Models

Proses produksi biodiesel menimbulkan hasil samping crude glycerol sekitar 10% (w/w). Kadar gliserol dalam crude tersebut masih rendah karena masih mengandung pengotor sehingga perlu pemurnian agar dapat dimanfaatkan untuk bahan baku industri, misalnya industri obat dan kosmetika. Penelitian ini bertujuan meningkatkan kemurnian crude glycerol dengan metoda adsorpsi menggunakan fly ash dan menentukan kapasitas adsorpsinya. Data kesetimbangan adsorpsi asam lemak bebas dalam gliserol didekati dengan Model Langmuir dan Freundlich. Berat adsorben pada penelitian ini berturut- turut 2,5; 5,0; 7,5 dan 10 gram dengan waktu adsropsi bervariasi selama 40, 50, 60 , 70 dan 80 menit. Hasil pemurnian dianalisa kandungan asam lemak bebas dan gliserol. Kadar asam lemak bebas dapat teradsorpsi maksimum ketika pemurnian menggunakan 10 g adsorben selama 60 menit. Kapasitas maksimum adsorpsi sebesar 5,186x10-4 mmol/g. Berdasarkan nilai koefisien korelasi (R2) menunjukkan bahwa model Langmuir dan Freundlich cocok untuk penelitian ini. Kata kunci : adsorpsi, Crude glycerol, biodiesel, fly ash Crude glycerol is a byproduct of the production of biodiesel produced about 10% (w/w) of the weight of biodiesel . Crude glycerol still contains many impurities that cause low levels of glycerol into that utilization is not maximized . Purified glycerol widely used in several fields such as manufacture of drugs and cosmetic. Therefore, there needs to be a process of purification in order to obtain higher levels of glycerol . This study aims to perform the purification of crude glycerol to determine the method of adsorption and adsorption capacity of fly ash. Adsorption processes associated with the equilibrium adsorption performed at constant temperature (isotherms) to obtain the maximum adsorption capacity data. Langmuir and Freundlich models proposed to interpret the data of adsorption equilibrium of free fatty acids in the glycerol . This research was carried out by varying the mass of adsorbent 2.5g , 5.0g , 7.5g and 10g, and the adsorption time 40, 50, 60, 70 and 80 minutes. Purification of crude glycerol were analyzed using analysis of free fatty acids and glycerol analysis. The results showed that 10g Mass adsorbent and adsorption time of 60 minutes can reduce Free Fatty Acid (FFA) that glycerol levels increased . The maximum adsorption capacity of 5.186 x10- 4 mmol/g. Based on the value of the correlation coefficient (R2) indicates that the Langmuir and Freundlich models are suitable for this study. Keywords: adsorption, crude glycerol, biodiesel, fly ash  

scholarly journals Removal of phosphate from coating wastewater using magnetic Fe-Cu bimetal oxide modified fly ash

2015 ◽  
Vol 6 (3) ◽  
pp. 430-436 ◽  
Author(s):  
Ke Xu ◽  
He Tao ◽  
Tong Deng
Keyword(s):  
Fly Ash ◽  
Langmuir Model ◽  
Experimental Results ◽  
Phosphate Adsorption ◽  
Order Model ◽  
Freundlich Model ◽  
Maximum Capacity ◽  
Adsorption Time ◽  
Pseudo Second Order ◽  
Modified Fly Ash

In this work, magnetic Fe-Cu bimetal oxide modified fly ash was used to remove phosphate from coating wastewater. The influences of pH, dosage amount and adsorption time on the removal of phosphate were investigated. The experimental results showed that pH had a significant effect on the adsorption of phosphate. The removal percentage of phosphate reached a maximum at pH 10. The removal efficiency of phosphate increased with the increase in adsorbent dosage. A kinetic study showed that the phosphate adsorption was well described by a pseudo second order model. The adsorption isotherm of phosphate could be described by the Langmuir model and Freundlich model. The Langmuir maximum capacity Q0 was 12.69 mg/g and the value of n of the Freundlich model was 3.82. The experimental results indicated that magnetic Fe-Cu bimetal oxide modified fly ash was a potential adsorbent for the removal of phosphate from the wastewater.

scholarly journals Removal of COD in Wastewater By Magnetic Coagulant Prepared From Modified Fly Ash

2021 ◽  
Author(s):  
Wen Wang ◽  
Liqiang Qi ◽  
Pan Zhang ◽  
Jichen Luo ◽  
Jingxin Li
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Removal Rate ◽  
Langmuir Equation ◽  
Cod Removal ◽  
Impregnation Method ◽  
Order Kinetic ◽  
Experimental Conditions ◽  
Magnetic Components ◽  
Modified Fly Ash

Abstract In order to investigate the effective method of COD removal from desulfurization wastewater, acid-modified fly ash (AFA) and base-modified fly ash (BFA) were prepared by impregnation method. Then, magnetic coagulants (Fe-AFA, Fe-BFA) were prepared by mixing the modified fly ash with magnetic components. The structural characterization results showed that the specific surface area and the porosity of fly ash were obviously increased after modification. Fe-AFA magnetic coagulant has the best performance and superparamagnetism. Under the same experimental conditions, the maximum COD removal amounts of FA, BFA, AFA, Fe-BFA and Fe-AFA were 2.180, 3.209, 4.631, 3.710 and 5.687 mg/g, respectively. The COD removal amount of Fe-AFA was increased by 112.43% compared with the raw FA. The quasi-second-order kinetic and Langmuir equation could well fit the COD coagulation process of five coagulants. After five cycles, the COD removal amount of Fe-AFA was 2.735 mg/g, and the removal rate still reached 67.53%. These findings provide a feasible method for the treatment of fly ash from coal-fired power plants and the preparation of highly efficient COD trapping magnetic coagulants.

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