Adsorption Study of Methylene Blue and Eriochrome Black T Dyes on Activated Carbon and Magnetic Carbon Composite (original) (raw)
Related papers
Journal of Hazardous Materials, 2009
The combination of magnetic nanoparticles with other adsorbents not only does not affect their magnetic properties, but also leads to the formation of adsorbents that improve the refining process. The aim of this study was synthesis of magnetic activated carbon by Fe 3 O 4 and investigation of its efficiency in adsorption of Lead from aqueous solutions. Magnetic adsorbent prepared by the method of sequestration and physical characteristics and structure of synthesized absorbent were determined by XRD and TEM. To remove the Lead from aqueous solutions, the Box-Behnken design (BBD) of response surface methodology (RSM) was employed for optimizing all parameters affecting the adsorption process. The studied parameters were pH (5-9), temperature (25-45 ⁰C) and the amount of adsorbent (0.5-2 g). 15 experimental runs were calculated by using BBD. The optimal condition for removal of Lead by synthesis of magnetic activated carbon by Fe 3 O 4 nanoparticles was pH=7, 450 ⁰C temperature and 2 g of adsorbent. Kinetic studies of the adsorption process specified the efficiency of the pseudo second-order kinetic model and showed the optimal time was 15 min, respectively. The maximum percentage of Lead removed after 90 min was 86.87%. The adsorption isotherm was well-fitted to Longmire model. The study showed that magnetic activated carbon has a high potential for Lead removal. Therefore, it is believed that magnetized active carbon by keeping its physical and surface properties could be a suitable method to solve some related problems including separation and filtration.
Journal of Chemical & Engineering Data, 2020
Reactive blue-13 (RB-13) dye was removed using magnetic activated carbon (MAC) in the batch mode. The effect of the initial mass of the adsorbent (1−25 g/L), initial RB-13 concentration (10−50 mg/L), solution pH (2−12), temperature (298−333 K), and contact period (0−120 min) on the removal of RB-13 dye was explored. The isoelectric point study was also performed for determining the pH at which the net charge on the surface of MAC was equivalent to zero. The Langmuir adsorption isotherm showed the best correlation at all temperatures. The adsorption kinetics was best described by a pseudo-second-order model. Thermodynamic study concluded that the adsorption of RB-13 dye onto MAC took place exothermically and the process was spontaneous.
Applied Water Science
Textile industries use large amounts of water and chemicals for finishing and dying processes. The chemical structures of dyes vary enormously, and some have complicated aromatic structures that resist degradation in conventional wastewater treatment processes because of their stability to sunlight, oxidizing agents, and microorganisms. The objective of this research is to compare the adsorption efficiency of two types of magnetic activated carbons derived from Banana peel and Salvia seed for the removal of basic blue 41 dye. The faculty of the produced activated carbons to remove basic blue 41 dye from aqueous solutions via batch adsorption has been examined under several operating conditions such as pH, adsorbent dose, initial adsorbate concentration and contact time. The cheap, non-toxic produced activated carbons (AC) were characterized by scanning electron microscope and Brunauer-Emmett-Teller analyses. The best conditions of dye adsorption with BPAC@ Fe3O4 equal to pH = 9, AC ...
Jurnal Teknologi
This paper focused on the studying of adsorption properties of Fe3O4-waste paper activated carbon composites for the removal of methylene blue dyes from water. The various parameters were carried out for the adsorption test of the composites, namely; contact time, adsorbent dose, initial MB concentration, pH solution, and temperature. The adsorption of isotherm, thermodynamics and kinetic was used to determine the characteristics of methylene blue adsorption onto the prepared adsorbent. The result indicates that the optimum adsorption capacity has occurred at pH = 6 in water solution. The adsorption capacity increase as the temperature increase until at 315K (45oC). The Langmuir isotherm is more appropriate to be applied as the adsorption model with the maximum adsorption capacity (qm) value of 101 and 93 mg/g for KA HCl-Fe3O4 and KA-Fe3O4 composites, respectively. The value of adsorption thermodynamic parameters was positive for ΔH, negative for ΔGo and positive for ΔSo, meaning th...
Dyes and Pigments, 2008
The adsorption behavior of C.I. Reactive Blue 2, C.I. Reactive Red 4, and C.I. Reactive Yellow 2 from aqueous solution onto activated carbon was investigated under various experimental conditions. The adsorption capacity of activated carbon for reactive dyes was found to be relatively high. At pH 7.0 and 298 K, the maximum adsorption capacity for C.I. Reactive Blue 2, C.I. Reactive Yellow 2 and C.I. Reactive Red 4 dyes was found to be 0.27, 0.24, and 0.11 mmol/g, respectively. The shape of the adsorption isotherms indicated an L2-type isotherm according to the Giles and Smith classification. The experimental adsorption data showed good correlation with the Langmuir and Ferundlich isotherm models. Further analysis indicated that the formation of a complete monolayer was not achieved, with the fraction of surface coverage found to be 0.45, 0.42, and 0.22 for C.I. Reactive Blue 2, C.I. Reactive Yellow 2 and C.I. Reactive Red 4 dyes, respectively. Experimental data indicated that the adsorption capacity of activated carbon for the dyes was higher in acidic rather than in basic solutions, and further indicated that the removal of dye increased with increase in the ionic strength of solution, this was attributed to aggregation of reactive dyes in solution. Thermodynamic studies indicated that the adsorption of reactive dyes onto activated carbon was an endothermic process. The adsorption enthalpy (DH ads ) for C.I. Reactive Blue 2 and C.I. Reactive Yellow 2 dyes were calculated at 42.2 and 36.2 kJ/mol, respectively. The negative values of free energy (DG ads ) determined for these systems indicated that adsorption of reactive dyes was spontaneous at the temperatures under investigation (298e328 K).
Role of the similar molecular weight dyes on the adsorption by activated carbon
DESALINATION AND WATER TREATMENT
In the current study, the effect on the adsorption of dyes (Basic red 2, Basic blue 3 and Ethyl orange) having almost similar molecular weight but belonging to different classes and functional groups on air activated carbon prepared from demineralised kraft lignin (DKLAAC) was investigated. The experimental and theoretical adsorption values for the dyes on DKLAAC were found to be 0.599, 0.550 and 0.395 mmol g-1 and 0.569, 0.520 and 0.387 mmol g-1 for Basic red 2, Basic blue 3 and Ethyl orange, respectively. Basic red 2 showed maximum adsorption (0.599 mmol g-1) on DKLAAC owing to more hydrophobicity and resonance in its structure. Contrarily, Ethyl orange showed minimum adsorption due to the hydrophilicity and less number of benzene rings. The presence of acid/basic site concentration of DKLAAC also affects the adsorption process. The obtained experimental data fitted best to the pseudo-second-order kinetic model. Thermodynamic parameters analysed confirms the feasibility, spontaneity and endothermic nature of the adsorption process.
Molecules
Activated carbon prepared from lemon (Citrus limon) wood (ACL) and ACL/Fe3O4 magnetic nanocomposite were effectively used to remove the cationic dye of crystal violet (CV) from aqueous solutions. The results showed that Fe3O4 nanoparticles were successfully placed in the structure of ACL and the produced nanocomposites showed superior magnetic properties. It was found that pH was the most effective parameter in the CV dye adsorption and pH of 9 gave the maximum adsorption efficiency of 93.5% and 98.3% for ACL and ACL/Fe3O4, respectively. The Dubinin–Radushkevich (D-R) and Langmuir models were selected to investigate the CV dye adsorption equilibrium behavior for ACL and ACL/Fe3O4, respectively. A maximum adsorption capacity of 23.6 and 35.3 mg/g was obtained for ACL and ACL/Fe3O4, respectively indicating superior adsorption capacity of Fe3O4 nanoparticles. The kinetic data of the adsorption process followed the pseudo-second order (PSO) kinetic model, indicating that chemical mechan...
Adsorption of anionic and cationic dyes on activated carbons with different surface chemistries
The influence of the surface chemical groups of an activated carbon on the removal of different classes of dyes is evaluated. Starting from the same material (NORIT GAC 1240 PLUS), the following treatments were carried out in order to produce a series of samples with different surface chemical properties but with no major differences in their textural properties: oxidation in the liquid phase with 6 M HNO 3 and 10 M H 2 O 2 (acid materials) and heat treatment at 700 C in H 2 or N 2 flow (basic materials). The specific micropores volume and mesopores surface area of the materials were obtained from N 2 adsorption equilibrium isotherms at 77 K. The surface chemistry was characterised by temperature programmed desorption , by the determination of the point of zero charge (pH pzc) and by the evaluation of the acidity/basicity of the samples. Elemental and proximate analyses were also carried out. Equilibrium isotherms of selected dyes (an acid, a basic and a reactive dye) on the mentioned samples were obtained and the results discussed in relation to their surface chemistry. In general, the Langmuir model provided the best fit for the adsorption data. It is shown that the surface chemistry of the activated carbon plays a key role in dye adsorption performance. The basic sample obtained by thermal treatment under H 2 flow at 700 C is the best material for the adsorption of all the tested dyes.
Kinetic and Equilibrium Study of Adsorption of Di-Azo Dyes on Commercial Activated Carbon
Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences
Dyes are organic compounds; usually have a complex aromatic molecular structure making them stable and resistant to biodegradation (Mohorcic et al., 2004). Azo dyes represent the largest class of commercially produced dyes, in which the chromophores are the azo group (Sutherland, 2004; Wallace, 2001). Synthetically, they were produced in a huge amounts, exceeding (500,000) tons annually (Lewis, 1999), and were used in various industrial fields including the textile industry. The high stability and distinguishing colour of azo dyes, especially those with di and multiple azo groups attracted the attention of many manufactures and become valuable for such industry. The excess of dye remains in the effluent after dyeing process is commonly forms a wastewater with concentration ranging (from 10 to 200 g/L) of dyestuffs (Van der Zee, 2002). Since some azo dyes and their degradation products are toxic and carcinogenic, their disposal into wastewater without advanced treatment creates a dramatic source of pollution and damages the aquatic life. For this reason, a proper treatment is needed and dyes removal from wastewater became essential. Intensive research work was carried out concerning treatment of such problems and aiming for providing a suitable technology for environmental protection. Various physiochemical and biological methods are described in the literature which can be employed for removing dyes from wastewater including; filtration