scholarly journals Utilization of response surface methodology in optimization of de-oiled olive pomace activated biochar production

2020 ◽  
Vol 148 ◽  
pp. 02006 ◽  
Author(s):  
Ralf Ruffel Abarca ◽  
Mark Daniel de Luna ◽  
Sudip Chakraborty ◽  
Stefano Curcio ◽  
Sebastiano Candamano
Keyword(s):  
Methylene Blue ◽  
Pyrolysis Temperature ◽  
Fixed Bed ◽  
Dye Adsorption ◽  
Optimum Process ◽  
Activation Process ◽  
Olive Pomace ◽  
Activation Time ◽  
Activated Biochar ◽  
Fixed Bed Adsorption

Olive activated biochar (OAB) was prepared from waste de-oiled olive pomace (sansa esausta, SE) through carbonization followed by combined KOH and thermal activation. The activation process was optimized using central composite design (CCD) with pyrolysis temperature, activation time and KOH to pyrolized SE mass ratio (KOH/PSE) as independent variables, and yield, methylene blue number (MBN) and iodine number (ID) as responses. Optimized OAB was subjected to fixed bed adsorption of 100 mg L−1 methylene blue dye. Numerical optimization resulted in optimum process setting of 362°C pyrolysis temperature, 61-min activation time and 0.81 KOH/PSE under which the optimized activated biochar produced 31% OAB, MBN of 679 and ID of 899. Thomas and Yoon-Nelson models best fit the fixed bed adsorption data implying that methylene blue adsorption conforms to Langmuir isotherm and obeys pseudo-second order reversible reaction kinetics with no axial dispersion. The theoretical adsorption capacity of OAB is 131 mg g−1 with theoretical time required for 50% sorbate breakthrough of 54.69 h. These results show the potential application of OAB in dye adsorption.

scholarly journals REMOÇÃO DE CORANTES TÊXTEIS POR COAGULAÇÃO-FLOCULAÇÃO-SEDIMENTAÇÃO E ADSORÇÃO

2020 ◽  
Vol 12 (2) ◽  
pp. 77-88
Author(s):  
Gabriela Fonseca da Costa ◽  
Marcella Yuri de Almeida Sawaguchi ◽  
Vilson Gomes da Assunção Júnior
Keyword(s):  
Water Quality ◽  
Methylene Blue ◽  
Adsorption Capacity ◽  
Copper Phthalocyanine ◽  
Fixed Bed ◽  
Pigment Dispersion ◽  
Proper Treatment ◽  
Treatment Efficiency ◽  
Fixed Bed Adsorption

Textile effluents when discharged into water bodies without proper treatment cause damage to the water quality of the receiving bodies, mainly due to the large amount of dyes used for dyeing tissues, being necessary to conduct research aiming to improve the treatment efficiency of these effluents. Thus, the objective of this work wasto assessthe removal of pigments Copper phthalocyanine,naphthol monoazole, diaxazine and diazotic, by testbench. For this, the synthetic effluent with pigment dispersion of Copper phthalocyanine was prepared, and the treatments used were coagulation-flocculation and sedimentation using polyaluminium hydroxychloride as coagulant, followed by fixed bed adsorption and the treatment efficiency was measuredthe following parameters: pH, conductivity, turbidity and pigment concentration. The results indicated the best coagulation condition with in pH of 7.41 and 10 mg.L-1dosage of coagulant resulting in 95.0% turbidity and 90.0% color removal. The best adsorbent, CAG 01,for adsorption sampled in this work presented Methylene blue index of 328.12 mg.g-1 and adsorption capacity in equilibrium equal44.57 mg g-1. Coagulation-flocculation and sedimentation treatment removed 75.29% of the pigments and withadsorption treatment, the removal of the pigments reached 97.30%.

scholarly journals Activated Bledug Kuwu’s Clay as Adsorbent Potential for Synthetic Dye Adsorption: Kinetic and Thermodynamic Studies

2021 ◽  
Vol 17 (1) ◽  
pp. 22-31
Author(s):  
Sri Lestari ◽  
Muflihah Muflihah ◽  
Ratna Kusumawardani ◽  
Mukhamad Nurhadi ◽  
Yuniati Mangesa ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Dye Adsorption ◽  
Activation Process ◽  
Acid Activation ◽  
Synthetic Dyes ◽  
Central Java ◽  
Removal Capacity ◽  
Pseudo Second Order ◽  
Increase Surface Area ◽  
Kinetic And Thermodynamic Studies

Bledug Kuwu is one of the geological phenomena as a mud volcano that occurs in Kuwu, Purwodadi, Grobogan, Central Java, Indonesia. The evaluation of Bledug Kuwu’s clay as one of the adsorbents for synthetic dyes has been carried out. The preparation of the adsorbent started with washing the clay with distilled water, followed by activation with a solution of hydrochloric acid (1 M) under mechanistic stirring for overnight. The C−H and O−H groups found on the clay adsorbent could attract methylene blue by dispersion forces and hydrogen bonding. Hydrocloric acid activation process for clay can increase surface area from 49 to 70 m2.g−1, meanwhile, reducing the average crystal size from 48.3 to 43.4 nm. The dye removal capacity increased from 34 to 40 mg.g−1 in corresponding to the increase of the temperature from 30 to 50 °C. The results showed that the equilibrium adsorption capacity of activated Bledug Kuwu’s clay reached 99% in an adsorption time of 20 min. The kinetic models of methylene blue adsorption onto BKC and ABKC adsorbents follow the pseudo-second order and the adsorption process is spontaneous with free energy (ΔG) as −23.519 kJ.mol−1. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

Fixed-bed adsorption of methylene blue by rice husk ash and rice husk/CoFe2O4nanocomposite

2015 ◽  
Vol 57 (27) ◽  
pp. 12793-12803 ◽  
Author(s):  
Kang-Kang Yan ◽  
Jiao Huang ◽  
Xue-Gang Chen ◽  
Shu-Ting Liu ◽  
Ao-Bo Zhang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Fixed Bed ◽  
Fixed Bed Adsorption

Removal of Dyes from the Textile Industry by Adsorption in Fixed Bed Columns: A Sustainable Process

2009 ◽  
Vol 4 (4) ◽  
Author(s):  
Andressa Regina Vasques ◽  
Selene Maria Arruda Guelli Ulson de Souza ◽  
José Alexandre Borges Valle ◽  
Antônio Augusto Ulson de Souza
Keyword(s):  
Textile Industry ◽  
Fixed Bed ◽  
Dye Adsorption ◽  
Textile Wastewater ◽  
Reactive Dye ◽  
Breakthrough Curves ◽  
Maximum Adsorption Capacity ◽  
Fixed Bed Adsorption ◽  
Different Temperatures ◽  
Textile Wastewater Treatment

The capacity and mechanism of mono and bi-functional reactive dye adsorption utilizing a new adsorbent obtained from the dried residual sludge (~10% w.w.) of a textile wastewater treatment system was studied. With the focus on determining the efficiency of the adsorbent in the dye removal, the adsorption isotherms were determined for the reactive dyes RR2 and RR141, at different temperatures and salt concentrations. The experiments were carried out in fixed bed adsorption columns, which were defined as the best adsorption experimental condition for both of the dyes through the parameter qm (mg/g), obtained by the adjustment of Langmuir isotherms. Breakthrough curves for the dyes RR2 and RR141 were obtained varying the height to which the fixed bed columns were packed with adsorbent (15, 30 and 45 cm) and varying the adsorbate feed rate in the column (8, 12 and 16 ml/min). For the dye RR2 the maximum adsorption capacity was 53.48 mg/g and for the dye RR141 it was 78.74 mg/g.

Fixed bed adsorption of Methylene Blue by ultrasonic surface modified chitin supported on sand

2015 ◽  
Vol 100 ◽  
pp. 302-310 ◽  
Author(s):  
G.L. Dotto ◽  
J.M. Nascimento dos Santos ◽  
R. Rosa ◽  
L.A.A. Pinto ◽  
F.A. Pavan ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Fixed Bed ◽  
Fixed Bed Adsorption ◽  
Surface Modified

Low-cost, biodegradable and highly effective adsorbents for batch and column fixed bed adsorption processes of methylene blue

2019 ◽  
Vol 7 (5) ◽  
pp. 103409 ◽  
Author(s):  
Amina Aichour ◽  
Hassina Zaghouane-Boudiaf ◽  
Fathiah Binti Mohamed Zuki ◽  
Mohamed Kheireddine Aroua ◽  
César Viseras Ibbora
Keyword(s):  
Methylene Blue ◽  
Low Cost ◽  
Fixed Bed ◽  
Fixed Bed Adsorption ◽  
Highly Effective ◽  
Adsorption Processes

scholarly journals Analysis of measuring methods of the concentration of methylene blue in the sorption process in fixed-bed column

2021 ◽  
Author(s):  
P. Ostaszewski ◽  
O. Długosz ◽  
M. Banach
Keyword(s):  
Methylene Blue ◽  
Continuous Measurement ◽  
Fixed Bed ◽  
Sorption Process ◽  
Environmental Damage ◽  
Fixed Bed Column ◽  
Additional Information ◽  
Actual Nature ◽  
Fixed Bed Adsorption ◽  
Kinetics Of

AbstractThe wastewater from industry is contaminated with dyes, which should be removed in order to prevent environmental damage. This paper presents a method for removing methylene blue from an aqueous solution using a fixed-bed adsorption process onto sawdust. In the article, the method of continuous measurement of methylene blue concentration in the process of sorption on sawdust was used. The results were compared with the results obtained by the standard method of periodic testing of the dye concentration. Continuous measurement of the dye concentration after the sorption process provides the actual nature of the process and the method offers additional information about the process, as opposed to a periodic test in which the concentration of the ingredient gives only averaged results. The kinetics of the methylene blue sorption process at variable initial dye concentrations are presented. The initial concentration of methylene blue had a significant impact on the process breakthrough curve. The increase in concentration (range of 10–90 mg/dm3) caused the extension of the penetration zone of the dye mass, thus gradually adsorbing itself on the bed. In the study of kinetics, the Bohart–Adams model was the best fit.

scholarly journals The utilization of sorbents obtained from miscanthus using steam as the activation agent for wastewaters treatment

2007 ◽  
Vol 9 (2) ◽  
pp. 102-105 ◽  
Author(s):  
Krystyna Bratek ◽  
Wiesław Bratek ◽  
Marek Kułażyński
Keyword(s):  
Methylene Blue ◽  
Sorption Capacity ◽  
Congo Red ◽  
Rotary Furnace ◽  
Activation Process ◽  
Optimum Conditions ◽  
Activation Time ◽  
Activation Temperature ◽  
Activation Products ◽  
Wastewaters Treatment

The utilization of sorbents obtained from miscanthus using steam as the activation agent for wastewaters treatment The possibility of obtaining sorbents with a good sorption capacity from miscanthus has been investigated. The chars and the activation products were obtained from the miscanthus in a rotary furnace. The activation process of miscanthus was carried out by water vapour at 700-800°C and at the activation time of 30-90 min. We found that the optimum conditions for the activation process were: the activation temperature of 750°C (activation time of 60 and 90 min) and 800°C (activation time of 45 or 60 min). For these conditions the sorbents with the best sorption capacity for p-chlorophenol, toluene, methylene blue and Congo red were obtained.

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