scholarly journals ADSORPTION OF ORGANIC DYES ON METALLURGICAL SLAG OF Fe-Ni ALLOY PRODUCTION

2020 ◽  
Vol 63 (8) ◽  
pp. 103-108 ◽  
Author(s):  
Elina B. Khobotova ◽  
Inna V. Hraivoronska ◽  
Marina I. Ihnatenko ◽  
Iuliya S. Kaliuzhna
Keyword(s):  
Organic Dyes ◽  
Chemical Activation ◽  
Local Treatment ◽  
Methyl Violet ◽  
Metallurgical Slag ◽  
Maximum Efficiency ◽  
Acid Activation ◽  
Sorbent Layer ◽  
Static Mode ◽  
Ni Alloy

The optimal parameters of organic dyes adsorption on the metallurgical slag of the Fe-Ni alloy production of the Pobuzhsky Ferronickel Plant, Ukraine: pH, the mass ratio “dye: slag adsorbent”, the type of chemical activation depending on the mode of the adsorption process were determined. Sorption of organic dyes (methylene blue MB, Congo red and methyl violet MV) by slag was studied spectrophotometrically. It is shown that after acid and alkaline activation the surface adsorption centers are formed on the surface of the slag: hydroxyl and silanol groups, whose dissociation causes a negative charge of the particles surface. The most appropriate ratio is “MB : slag” = 1 mg/g, at which the adsorption value a=0.92 mg/g is recorded at a treatment efficiency of 92 %. The maximum efficiency of MB adsorption by slag based on diopside was recorded in the pH range of 4.8- 10.4. The dependence of the type of chemical activation of slag with basic mineral – diopside on the sorption mode of organic dyes was determined. Slag acid activation is advisable in the static mode of MV sorption; alkaline – under conditions of MV dynamic sorption with a low rate of solution passage through the sorbent layer. Diopside-based slag is expedient to use as an adsorbent of organic dyes at the level of their low concentrations at the local treatment of wastewater generated during the certain technological operations.

scholarly journals Effect of Structure and Chemical Activation on the Adsorption Properties of Green Clay Minerals for the Removal of Cationic Dye

2018 ◽  
Vol 8 (11) ◽  
pp. 2302 ◽  
Author(s):  
Abdelfattah Amari ◽  
Hatem Gannouni ◽  
Mohammad Khan ◽  
Mohammed Almesfer ◽  
Abubakr Elkhaleefa ◽  
...  
Keyword(s):  
Clay Minerals ◽  
Pore Volume ◽  
Acid Treatment ◽  
Structural Changes ◽  
Chemical Activation ◽  
Total Pore Volume ◽  
Batch Adsorption ◽  
Acid Activation ◽  
Cationic Dye ◽  
Average Pore

In this study, natural clay minerals with green appearance were treated with sulfuric acid. Mass percentage of acid (wt%), temperature (T), contact time (t) and liquid-to-solid mass ratio (R) are used as the prevailing factors that determine the extent of acid-activation. The values of these factors range from 15–50%, 60–90 °C, 1.5–6 h and 4–7, respectively. The study has focused on the structural changes as well as textural characteristics of the clay. Three activated clay samples were prepared under different treatment conditions. The samples were characterized using X-ray powder diffraction (XRD), fourier transform infrared (FTIR), scanning electron microscope (SEM), chemical analysis and N2 adsorption techniques. Characterization of the treated clay minerals exhibited significant structural changes to a greater extent of acid-activation, from being partially crystalline to being amorphous silica. The surface area and total pore volume of clay increased proportionally with the level of acid treatment. The average pore diameter behaved differently. During the strong acid treatment, a large increase in pore volume and the enlargement of the pore size distribution were observed. This suggests that considerable structural changes and partial destruction may have occurred in this condition. The removal of methylene blue, used as cationic dye, from aqueous solution by the batch adsorption technique on three prepared acid-activated clay samples was studied. The Langmuir model was found to agree well with the experimental data.

A new Zn(ii)-based 3D metal–organic framework with uncommon sev topology and its photocatalytic properties for the degradation of organic dyes

CrystEngComm ◽  
2019 ◽  
Vol 21 (31) ◽  
pp. 4578-4585 ◽  
Author(s):  
Ying Pan ◽  
Qiongjie Ding ◽  
Hongjia Xu ◽  
Chunyue Shi ◽  
Amita Singh ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Organic Dyes ◽  
Metal Organic Framework ◽  
Methyl Violet ◽  
Photocatalytic Properties ◽  
Metal Organic ◽  
Organic Framework

A new Zn(ii) based 3D MOF having uncommon sev topology synthesized and used as efficient photocatalyst for the photodegradation of dyes methyl violet and rhodamine B.

scholarly journals Synthesis of Copper(II) Trimesinate Coordination Polymer and Its Use as a Sorbent for Organic Dyes and a Precursor for Nanostructured Material

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1024 ◽  
Author(s):  
Gulzhian I. Dzhardimalieva ◽  
Rose K. Baimuratova ◽  
Evgeniya I. Knerelman ◽  
Galina I. Davydova ◽  
Sarkyt E. Kudaibergenov ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Organic Dyes ◽  
Methyl Violet ◽  
Dye Adsorption ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Infrared Spectrometry ◽  
Synthesis Methods ◽  
Type I ◽  
Free Energy Of Adsorption

Several important synthesis pathways for metal-organic frameworks (MOFs) were applied to determine how the synthesis methods and conditions affect the structure and adsorption capacity of the resulting samples. In the present work, three different synthesis routes were used to obtain copper trimesinate coordination polymer: Slow evaporation (A), solvothermal synthesis using a polyethylene glycol (PEG-1500) modulator (B), and green synthesis in water (C). This MOF was characterized by elemental analysis, infrared spectrometry, X-ray diffraction, scanning electron microscopy, thermogravimetry and volumetric nitrogen adsorption/desorption. The samples have permanent porosity and a microporous structure with a large surface area corresponding to the adsorption type I. The obtained MOF was tested as a sorbent to remove organic dyes methylene blue (МВ), Congo red (CR) and methyl violet (MV) as examples. Dye adsorption followed pseudo-first-order kinetics. The equilibrium data were fitted to the Langmuir and Freundlich isotherm models, and the isotherm constants were determined. Thermodynamic parameters, such as changes in the free energy of adsorption (∆G0), enthalpy (∆H0), and entropy (∆S0), were calculated. Thermolysis of copper trimesinate leads to the formation of carbon materials Cu@C with a high purity.

Organic and Inorganic Acid Activation of Activated Carbon Fiber from Palm Oil Empty Fruit Bunch

2013 ◽  
Vol 858 ◽  
pp. 122-130
Author(s):  
Wee Keat Cheah ◽  
Radzali Othman ◽  
Fei Yee Yeoh
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Palm Oil ◽  
Chemical Activation ◽  
Activated Carbon Fiber ◽  
Raw Material ◽  
Acid Activation ◽  
Empty Fruit Bunch ◽  
Pore Characteristics ◽  
Inorganic Acids

Activated carbon fiber is known to posses better properties compared to granular and powdered variants, with significantly higher surface area and higher pore volume. Source of raw material and activation step are two crucial parameters for the pore development of activated carbon. Palm oil empty fruit bunch fiber contains naturally formed long open channels which offer better access of adsorbates into micropores. Chemical activation step typically involves inorganic acids such as phosphoric acid and sulfuric acid. However, such residues of inorganic acids might create unfavourable conditions for certain adsorption applications, if not removed properly from synthesized activated carbon fiber. Additionally, subsequent to the acid cleaning or removal step, most inorganic acids would eventually cause problems to the environment if acid disposal is not properly managed. This paper investigates on the effect of utilization of organic acids acetic acid and citric acid, as compared to commonly used inorganic acids, on the pore characteristics of palm oil empty fruit bunch fiber derived activated carbon fiber.

Photodegradation of organic dyes based on anatase and rutile TiO2 nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (4) ◽  
pp. 2746-2759 ◽  
Author(s):  
Ashish Gautam ◽  
Anuraj Kshirsagar ◽  
Rahul Biswas ◽  
Shaibal Banerjee ◽  
Pawan K. Khanna
Keyword(s):  
Tio2 Nanoparticles ◽  
Organic Dyes ◽  
Dye Degradation ◽  
Uv Light ◽  
Anatase Phase ◽  
Maximum Efficiency ◽  
Degradation Study ◽  
Rutile Tio2 ◽  
Rutile Titania

Dye degradation study using anatase and rutile titania suggests maximum efficiency of about 88% using anatase phase for MB under short UV light however, the maximum degradation under long UV light was not more than 65% (anatase/ rutile/EBT).

scholarly journals Influence of Acid Activation of a Mixture of Illite, Koalinite, and Chlorite Clays on the Adsorption of Methyl Violet 6B Dye

2021 ◽  
pp. 1761-1778
Author(s):  
Saba Adel Saed ◽  
Donia Aidan
Keyword(s):  
Adsorption Process ◽  
Methyl Violet ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Acid Activation ◽  
Solution Ph ◽  
Adsorption Method ◽  
Force Microscopy ◽  
Atomic Force ◽  
Hoff Equation

The influence of acid activation of a mixture of illite, kaolinite, and chlorite clays collected from the area of Zorbatiya (east of Iraq) on the adsorption of methyl violet 6B (MV6B) as a cationic dye was studied. The activation was carried out by using 0.25M HCl and 0.25M . Raw and acid-activated clays were analyzed by atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Batch adsorption method was used to study the adsorption of MV6B onto the raw and acid activated clays. The impacts of different factors on the adsorption process were studied, such as clay weight, agitation time, starting MV6B concentration, temperature, ionic strength, and solution pH. The adsorption process was described by using Langmuir, Freundlich, Temkin, and Dubinin- Radushkevich isotherm models. Thermodynamic parameters like  were estimated based on Vanʼt Hoff equation.

scholarly journals RESEARCH INTO DYNAMICS OF ADSORPTION OF HEAVY METALS ON ACID-ACTIVATED BENTONITE

2021 ◽  
Vol 2 (39) ◽  
pp. 115-124
Author(s):  
D. Stetsenko ◽  
D. Yelatontsev
Keyword(s):  
Heavy Metals ◽  
Chemical Modification ◽  
Flow Rate ◽  
Protective Action ◽  
Acid Activation ◽  
Sorbent Layer ◽  
Layer Height ◽  
Modified Bentonite ◽  
Sorption Column ◽  
Sorption Time

Acid activation of bentonite clay is a common way to obtain porous adsorbents of organic and inorganic substances. Acid activation with preservation of the layered structure is the initial stage of chemical modification. Acid treatment of natural aluminosilicates is aimed at increasing their adsorption capacity and specific surface area. In industrial practice, water treatment of heavy metals is in most cases carried out bypassing the liquid through a fixed layer of backfill. Therefore, in this study, we studied the dynamics of adsorption with the definition of the main characteristics of the process: the speed of the working zone, the coefficient of protective action, the length of the working layer, the loss of protective action time, the duration of the sorption column before leakage. In addition, the establishment of the basic laws of this process can be used to determine the optimal parameters of the sorption material at a given initial characteristic — the length of the layer of the sorption column, the filtration rate. We have studied the possibilities of chemical modification of granular bentonite during acid-salt treatment. Through sorption columns with a height of 0.1; 0.2 and 0.3 m, filled with samples of modified bentonite, were passed model solutions of salts Fe2+, Mn2+, Cu2+ and Cd2+ with a concentration of cations of 0.01 g/dm3. The flow rate of the solution was 0.5; 1.0 and 1.5 m/h. Experimental data show that the optimal sorption values ​​are obtained for samples of modified bentonite: at the same height of the sorbent layer and flow rate, the duration of the layer before skipping in modified samples is 1.25—1.52 times higher than in unmodified ones. It is established that the sorption time before skipping mainly depends on the flow rate and the height of the sorbent layer. Thus, at a layer height of 0.3 m and the same rate of transmission of the solution, the sorption time is up to 3.5 times greater than at a layer height of 0.1 m for all investigated cations.

scholarly journals Activated Carbon Production from Waste Biomass

2018 ◽  
Vol 7 (3.34) ◽  
pp. 345 ◽  
Author(s):  
Rajamani. R ◽  
Vinoth Kumar.B ◽  
Sujith . A ◽  
Karthick E
Keyword(s):  
Activated Carbon ◽  
Process Parameters ◽  
Chemical Activation ◽  
Waste Water Treatment ◽  
High Surface ◽  
Methyl Violet ◽  
Effluent Treatment ◽  
Activation Process ◽  
Impregnation Ratio ◽  
Static Conditions

Activated carbon is used as filter medium for the removal of hazardous particles in exhaust gases, in the purification of water and also in waste water treatment. Activated carbon is used in gas purification, water purification, sewage treatment and many other applications. This concept is used to satisfy the continuously increasing demand of activated carbon at low cost.The textile industry is one of the largest producers of dye effluent. Treatment of these effluents has to be cost effective hence a number of precursors have been studied as a viable alternative adsorbent. The present work relates to efforts made towards developing a high surface area activated carbon produced from the fruit shells of sterculia foetida by chemical activation process with phosphoric acid as the activating agent the fruit shell of sterculia foetida constitute a novel precursor for the preparation of activated carbon which has not yet been identified as a source for carbon material. Experiments were conducted in lab scale using muffle furnaces under static conditions in a self–generated atmosphere covering process parameters such as Impregnation Ratio (IR), Carbonization time and Temperature. The process parameters are characterized and optimized based on the Methylene Blue number, Methyl Violet Number and the Iodine number.The adsorption of reactive orange dye onto fruit shell of sterculia foetida activated carbon from aqueous solution was investigated. The process is carried out varying the process parameters as Impregnation Ratio (1:1 to 1:6), Activation Temperature (300 to 800 oC) and Activation Time (60 to 210 min).   

scholarly journals Enhanced Desilication of High Alumina Fly Ash by Combining Physical and Chemical Activation

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 411 ◽  
Author(s):  
Yanbing Gong ◽  
Junmin Sun ◽  
Shu-Ying Sun ◽  
Guozhi Lu ◽  
Ting-An Zhang
Keyword(s):  
Activation Energy ◽  
Fly Ash ◽  
Amorphous Phase ◽  
Chemical Activation ◽  
High Alumina ◽  
Side Reactions ◽  
Acid Activation ◽  
Hydrochloric Acid Concentration ◽  
X Ray ◽  
Physical Chemical

In this work, a physical–chemical activation desilication process was proposed to extract silica from high alumina fly ash (HAFA). The effects of fly ash size, hydrochloric acid concentration, acid activation time, and reaction temperature on the desilication efficiency were investigated comprehensively. The phase and morphology of the original fly ash and desilicated fly ash were analyzed by X-ray diffraction (XRD) and scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM-EDS). Compared with the traditional desilication process, the physical–chemical activation desilication efficiency is further increased from 38.4% to 53.2% under the optimal conditions. Additionally, the kinetic rules and equations were confirmed by the experimental data fitting with shrinking core model of liquid–solid multiphase reaction. Kinetic studies show that the enhanced desilication process is divided into two processes, and both steps of the two-step reaction is controlled by chemical reaction, and the earlier stage activation energy is 52.05 kJ/mol and the later stage activation energy is 58.45 kJ/mol. The results of mechanism analysis show that physical activation breaks the link between the crystalline phase and the amorphous phase, and then a small amount of alkali-soluble alumina in the amorphous phase is removed by acid activation, thereby suppressing the generation of side reactions of the zeolite phase.

Nano-engineered Adsorbent for the Removal of Dyes from Water: A Review

2020 ◽  
Vol 16 (1) ◽  
pp. 14-40 ◽  
Author(s):  
Nusrat Tara ◽  
Sharf Ilahi Siddiqui ◽  
Geetanjali Rathi ◽  
Saif Ali Chaudhry ◽  
Inamuddin ◽  
...  
Keyword(s):  
Water Adsorption ◽  
Treatment Process ◽  
Organic Dyes ◽  
Methyl Violet ◽  
Human Beings ◽  
Water Contaminants ◽  
Adsorptive Removal ◽  
Removal Capacity ◽  
Water Treatment Process ◽  
Adsorption Technology

Background: The huge quantity of wastewater, containing poisonous and hazardous dyes, is released by various industries which pollute water in direct and indirect ways. Most of the dyes are a dangerous class of water contaminants which have affected the environment drastically. Some dyes such as congo red, rhodamine B, methylene blue, methyl violet, and crystal violet are a serious threat to human beings. Remediation Method: Numerous methods are available for the removal of dyes from water. Adsorption, being a superior and eco-friendly technique, has advantage of eliminating organic dyes because of the availability of materials as adsorbents. The inexpensive nanomaterials are a more attractive choice for remediation of various dyes due to their unique properties and offer an adequate pathway to adsorb any organic dye from water to overcome its hazardous effects on human health. Results: In this review, we have discussed the latest literature related to various types of synthesis, characterization and uses as adsorbent for highly adsorptive removal capacity of nanoparticles for organic dyes. Conclusion: Adsorption technology provides an attractive pathway for further research and improvement in more efficient nanoparticles, with higher adsorption capacity, for numerous dyes to eliminate the dyes discharged from various industries and thus reduce the contamination of water. Therefore, nanocomposites may contribute to future prospective water treatment process.

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