scholarly journals Coupling Solvent Extraction Units to Cyclic Adsorption Units

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Mariana Busto ◽  
Enrique Eduardo Tarifa ◽  
Carlos Román Vera
Keyword(s):  
Activated Carbon ◽  
Carbon Adsorbent ◽  
Impurity Level ◽  
Measuring Process ◽  
Plant Oil ◽  
Extract Concentration ◽  
Predicting Performance ◽  
Cyclic Operation ◽  
Cyclic Adsorption ◽  
Extract Phase

The possibility of regenerating the solvent of extraction units by cyclic adsorption was analyzed. This combination seems convenient when extraction is performed with a high solvent-to-impurity ratio, making other choices of solvent regeneration, typically distillation, unattractive. To our knowledge, the proposed regeneration scheme has not been considered before in the open literature. Basic relations were developed for continuous and discontinuous extraction/adsorption combinations. One example, deacidification of plant oil with alcohol, was studied in detail using separate experiments for measuring process parameters and simulation for predicting performance at different conditions. An activated carbon adsorbent was regenerated by thermal swing, making cyclic operation possible. When extracting the acid with methanol in a spray column, feed = 4 L min−1, solvent = 80 L min−1, feed impurity level 140 mmol L−1, and extract concentration 7.6 mmol L−1, the raffinate reaches a purity of 1.2 mmol L−1, the solvent being regenerated cyclically in the adsorber (364 kg) to an average of 0.7 mmol L−1. Regeneration of the solvent by cyclic adsorption had a low heat duty. Values of 174 kJ per litre of solvent compared well with the high values for vaporization of the whole extract phase (1011 kJ L−1).

scholarly journals Application of Chitosan and Activated Carbon Nano-composite in Removal of Nitrite, Phosphate, and Ammonia From Aquaculture Wastewater

2019 ◽  
Vol 6 (2) ◽  
pp. 106-112
Author(s):  
Hassan Rezaei ◽  
Saeedeh Rastegar ◽  
Sanaz Naseri
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Wastewater Reuse ◽  
Palm Kernel ◽  
Carbon Adsorbent ◽  
Fish Farms ◽  
Nano Composite ◽  
Effluent Concentration ◽  
Quality Of Water ◽  
Aquaculture Wastewater

Developing an adsorbent with natural components is one of the effective methods to reduce the amount of wastewater pollutants. Wastewater reuse can improve the quality of water prior to entering the natural environment. The aim of this study was to evaluate the efficiency of chitosan nano-composite and activated carbon adsorbent in the removal of nitrite, phosphate, and ammonia pollutants from fish farms of Aq-Qala. To prepare the adsorbents, the shrimp shells were converted to nano-chitosan. The date palm kernel was prepared and activated with oxalic acid in pyrolysis furnace by injecting nitrogen gas into activated carbon, then, the nano-composite was prepared from nanochitosan and activated carbon. A field-laboratory study was conducted during the winter of 2018, and then, batches of synthesized nano-composite were investigated and the effects of pH, initial effluent concentration, and adsorption time were investigated. The experiments were performed in the pH range of 5-8, effluent concentration of 25-100 mg/L, and contact time of 15-90 minutes. The results showed that at optimum conditions (pH of 7, effluent concentration of 50 mg/L, and contact time of 60 minutes), the highest removal percentage and adsorption capacity for nitrite, phosphate, and ammonia contaminants were 99.98%, 99.77%, and 65.65%, and 6.65, 6.14, and 7.32 mg/g , respectively. Due to the high removal percentage (99.98%) of the chitosan and activated carbon nano-composite, the adsorbent was highly capable of removing pollutants (nitrite, phosphate, and ammonia).

Hysteresis in the cyclic adsorption of acetone, ethanol and ethyl acetate on activated carbon

Carbon ◽  
2000 ◽  
Vol 38 (7) ◽  
pp. 1083-1088 ◽  
Author(s):  
L. Gales ◽  
A. Mendes ◽  
C. Costa
Keyword(s):  
Activated Carbon ◽  
Ethyl Acetate ◽  
Cyclic Adsorption

scholarly journals Methylene blue removal using a low-cost activated carbon adsorbent from tobacco stems: kinetic and equilibrium studies

2017 ◽  
Vol 75 (10) ◽  
pp. 2390-2402 ◽  
Author(s):  
Bellington Mudyawabikwa ◽  
Henry H. Mungondori ◽  
Lilian Tichagwa ◽  
David M. Katwire
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Radiation Power ◽  
Low Cost ◽  
Carbon Adsorbent ◽  
Point Of Zero Charge ◽  
Order Kinetic ◽  
Optimum Conditions ◽  
Equilibrium Studies ◽  
Mb Adsorption

The aim of this study was to prepare activated carbon from tobacco stalks using microwave heating. The prepared activated carbon was applied as an adsorbent in methylene blue (MB) removal from water. The optimum conditions for activated carbon preparation were a radiation power of 280 W for a period of 6 minutes after the impregnation of the precursor material with 30% ZnCl2 for 24 hours. The activated carbon yield and iodine number were 49.43% and 1,264.51 mg/g respectively. The activated carbon also had a point of zero charge of 5.81 with an adsorption capacity of 123.45 mg/g for MB. The optimum conditions for MB adsorption were a pH of 6.5 with an adsorbent dosage of 0.2 g/50 mL at 25 °C. The MB adsorption kinetics followed the pseudo second order kinetic model with the intra-particle diffusion model suggesting a two-step adsorption mechanism. The adsorption data also fitted well within the Langmuir adsorption isotherm model. Tobacco stalks can successfully be turned into an economically important product.

Evaluation of activated carbon adsorbent for fuel cell cathode air filtration

2008 ◽  
Vol 175 (1) ◽  
pp. 383-389 ◽  
Author(s):  
Xiaowei Ma ◽  
Daijun Yang ◽  
Wei Zhou ◽  
Cunman Zhang ◽  
Xiangmin Pan ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Fuel Cell ◽  
Carbon Adsorbent ◽  
Air Filtration ◽  
Fuel Cell Cathode ◽  
Cell Cathode

scholarly journals Beta-Cyclodextrin-Decorated Magnetic Activated Carbon as a Sorbent for Extraction and Enrichment of Steroid Hormones (Estrone, β-Estradiol, Hydrocortisone and Progesterone) for Liquid Chromatographic Analysis

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 248
Author(s):  
Anele Mpupa ◽  
Azile Nqombolo ◽  
Boris Mizaikoff ◽  
Philiswa Nosizo Nomngongo
Keyword(s):  
Electron Microscopy ◽  
Activated Carbon ◽  
High Performance ◽  
Solid Phase ◽  
Extraction Procedure ◽  
Carbon Adsorbent ◽  
Analytical Techniques ◽  
Array Detector ◽  
Magnetic Activated Carbon ◽  
Wastewater Samples

A β-cyclodextrin-decorated magnetic activated carbon adsorbent was prepared and characterized using various analytical techniques (X-ray diffraction (XRD), scanning electron microscopy–electron diffraction spectroscopy (SEM-EDS) and transmission electron microscopy (TEM)), and the adsorbent was used in the development of a magnetic solid-phase microextraction (MSPE) method for the preconcentration of estrone, β-estradiol, hydrocortisone and progesterone in wastewater and river water samples. This method was optimized using the central composite design in order to determine the experimental parameters affecting the extraction procedure. The quantification of hormones was achieved using high-performance liquid chromatography equipped with a photodiode array detector (HPLC-DAD). Under optimum conditions, the linearity ranged from 0.04 to 300 µg L−1 with a correlation of determinations of 0.9969–0.9991. The limits of detection and quantification were between 0.01–0.03 and 0.033–0.1 µg L−1, with intraday and interday precisions at 1.1–3.4 and 3.2–4.2. The equilibrium data were best described by the Langmuir isotherm model, and high adsorption capacities (217–294 mg g−1) were obtained. The developed procedure demonstrated high potential as an effective technique for use in wastewater samples without significant interferences, and the adsorbent could be reused up to eight times.

scholarly journals Utilization of Activated Carbon Prepared from Industrial Solid Waste for the Removal of Chromium(VI) Ions from Synthetic Solution and Industrial Effluent

2005 ◽  
Vol 23 (2) ◽  
pp. 145-160 ◽  
Author(s):  
N. Vennilamani ◽  
K. Kadirvelu ◽  
Y. Sameena ◽  
S. Pattabhi
Keyword(s):  
Activated Carbon ◽  
Metal Ion ◽  
Industrial Effluent ◽  
Carbon Adsorbent ◽  
Freundlich Isotherm ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Adsorption Sites ◽  
Chromium Vi ◽  
Sago Waste

Activated carbon (AC) prepared from sago waste was characterized and used to remove chromium(VI) ions from aqueous solution and industrial effluent by adsorption methods using various conditions of agitation time, metal ion concentration, adsorbent dosage particle size and pH. Surface modification of the carbon adsorbent with a strong oxidizing agent like concentrated H2SO4 generates more active adsorption sites on the solid surface and pores for metal ion adsorption. Adsorption of the metal ion required a very short time and led to quantitative removal. Both the Langmuir and Freundlich isotherm models could describe the adsorption data. The calculated values of Q0 and b were 5.78 mg/g and 1.75 1/min, respectively. An effective adsorption capacity was noted for particle sizes in the range 125–250 μm at room temperature (30 ± 2°C) and an initial pH of 2.0 ± 0.2. The specific surface area of the activated carbon was determined and its properties studied by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FT-IR). These studies revealed that AC prepared from sago waste is suitable for the removal of Cr(VI) ions from both synthetic and industrial effluents.

scholarly journals A 70 MPa hydrogen thermally driven compressor based on cyclic adsorption-desorption on activated carbon

Carbon ◽  
2020 ◽  
Vol 161 ◽  
pp. 466-478 ◽  
Author(s):  
G. Sdanghi ◽  
V. Nicolas ◽  
K. Mozet ◽  
S. Schaefer ◽  
G. Maranzana ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Thermally Driven ◽  
Cyclic Adsorption ◽  
Adsorption Desorption

scholarly journals Review of Adsorption of Fe Metal by Activated Carbon Adsorbent

2021 ◽  
Vol 4 (2) ◽  
pp. 74
Author(s):  
Fakta Ideal Zega ◽  
Rini Selly ◽  
Moondra Zubir
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Particle Size ◽  
Activated Carbon ◽  
Carbon Adsorbent ◽  
Adsorption Properties ◽  
Literature Survey ◽  
High Adsorption ◽  
Stirring Time ◽  
Good Potential

Many researchers have used activated carbon as adsorbents for the adsorption heavy metal. The aim of present study was to investigate the adsorption properties of activated carbon for the removal of Fe metal. A research has been conducted to determine optimal of stirring time, stirring speed, adsorbent mass and particle size on activated carbon adsorbent in adsorption Fe metal. From the literature survey that increase in stirring time, stirring speed and adsorbent mass enhancing the removal of Fe metal. The results show which is on stirring time 60 minutes, stirring speed 90 radians per minute and adsorbent mass 2 grams have a high adsorption of the heavy metals of iron. Whereas the smaller of particle size enhancing the adsorption of Fe metal. The particle size of 200 mesh is the optimal particle size for adsorption of Fe. Finally, activated carbon showed to be a good potential adsorbent for removing Fe.

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