scholarly journals The adsorption of organic dyes using Diatomite from Phu Yen

2021 ◽  
Vol 10 (3) ◽  
pp. xx-xx
Author(s):  
Tuan Nguyen Minh ◽  
Cam Le Minh ◽  
Oanh Trinh Thi Kim ◽  
Ha Nguyen Thi Thu ◽  
Mo Nguyen Thi ◽  
...  
Keyword(s):  
Organic Dyes ◽  
Equilibrium Constants ◽  
Surface Characteristics ◽  
Morphological Properties ◽  
Data Sets ◽  
Polluted Environment ◽  
Order Model ◽  
Pseudo Second Order ◽  
Langmuir And Freundlich Models ◽  
Mb Adsorption

The prevalence of organic dyes contamination in water has driven widespread research on developing effective treatment systems including adsorption using various sorbents. The aim of this study is to investigate the methylene Blue (MB) adsorption of Diatomite Phu Yen and the influence of Fe loading into adsorption capacity. The prepared samples were characterized by XRD, TEM, EDX and BET methods to examine their structural, morphological properties, elemental composition and surface characteristics. Bath adsorption isotherms are conducted at several temperatures (283, 293, 303 and 313K).The data sets are analyzed with Langmuir and Freundlich models which produce Langmuir and Freundlich equilibrium constants (KL, KF), of adsorption for each process. Adsorption kinetics are followed closely the pseudo-second order model. The obtained results show that Diatomite could be an efficient adsorpbent for the removel of organic dyes from polluted environment. The presence of Fe results in negative MB adsorption behavior.

Removal of Strontium Ions from Aqueous Solution by Sunflower Straw

2013 ◽  
Vol 726-731 ◽  
pp. 1922-1925 ◽  
Author(s):  
Lian Ai ◽  
Xue Gang Luo ◽  
Xiao Yan Lin ◽  
Si Zhao Zhang
Keyword(s):  
Aqueous Solution ◽  
Batch Adsorption ◽  
Order Model ◽  
Solution Ph ◽  
Sorption Data ◽  
Freundlich Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Sunflower Straw ◽  
Langmuir And Freundlich Models

The sorptive potential of sunflower straw (≤125 μm) for Sr2+ from aqueous solution was evaluated. Batch adsorption experiments were carried out as a function of solution pH, adsorbent dosage, Sr2+ concentration and contact time. FT-IR spectra and SEM of sunflower straw were employed to explore the functional groups available for the binding of Sr2+ and morphology of the adsorbent. Maximum uptake capacity of sunflower straw was 17.48 mg/g occurred at around pH 3-7. The adsorption equilibrium can be achieved within 5 min and kinetic data were fitted well to pseudo-second-order model. The Langmuir and Freundlich models were applied to describe isotherm sorption data. The Langmuir model gave an acceptable fit than Freundlich model.

Ultrasound and microwave-assisted preparation of Fe-activated carbon as an effective low-cost adsorbent for dyes wastewater treatment

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78936-78946 ◽  
Author(s):  
Song Cheng ◽  
Libo Zhang ◽  
Hongying Xia ◽  
Jinhui Peng ◽  
Jianhua Shu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Langmuir Isotherm ◽  
Low Cost ◽  
Order Model ◽  
Microwave Assisted ◽  
Pseudo Second Order ◽  
Mb Adsorption

A and B are Langmuir isotherm and pseudo-second-order model. We conclude that MB adsorption capacity of Fe-activated carbon is bigger than raw activated carbon, indicating that Fe-activated carbon has better MB removal efficiency.

Study on Adsorption of Methylene Blue by Sarch-g-Polyacrylamide

2014 ◽  
Vol 881-883 ◽  
pp. 1175-1178
Author(s):  
Xu Man Wang ◽  
Cai Ning Zhang
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Adsorption Isotherm ◽  
Adsorption Process ◽  
Sorption Process ◽  
Kinetics Analysis ◽  
Order Model ◽  
Grafting Polymerization ◽  
Pseudo Second Order ◽  
Mb Adsorption

By means of grafting polymerization, cross-linked starch-g-polyacrylamide (starch-g-PAM) was prepared and used to adsorb methylene blue (MB). Adsorption isotherm and kinetic of the sorption process were studied. The experimental results demonstrated that the prepared starch-g-PAM was an effective adsorbent for removal of MB from aqueous solution. The adsorption of MB by starch-g-PAM was Freundlich type, and the adsorption equation was caculated to be . Furthermore, the adsorption kinetics analysis demonstrated that the adsorption process followed the pseudo-second-order model.

Removal of guar and humus from water by layered double hydroxides

2009 ◽  
Vol 59 (8) ◽  
pp. 1641-1647 ◽  
Author(s):  
Song Jin ◽  
Kangping Cui ◽  
Paul H. Fallgren ◽  
Michael A. Urynowicz ◽  
Jiazhong Jian
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Layered Double Hydroxides ◽  
Water Adsorption ◽  
Guar Gum ◽  
Order Model ◽  
Pseudo Second Order ◽  
Double Hydroxides ◽  
Langmuir And Freundlich Models

Natural organic matter such as guar and humus are recalcitrant to conventional pretreatment technologies and can potentially foul processes such as membranes during water treatment. An innovative method of using synthetic layered double hydroxides (LDH) was investigated for removing common natural organic matter in the form of guar gum (GG) and humic acid (HA) from water. Adsorption isotherms were evaluated with Langmuir and Freundlich models. Results show the affinity of GG and HA to LDH to be 11.31 and 9.33 mg g−1 LDH, respectively. Kinetic isotherms indicate that the sorbing rates of LDH to GG and HA increase with initial GG and HA concentrations, fitting a pseudo-second order model. This study demonstrate that LDH may be an effective material in removing GG and HA from waters and offer an alternative to conventional pretreatment technologies for the mitigation fouling of membrane and other systems in water treatment.

Preparation, microstructure and dye adsorption behavior of nanostructured FeTiO3 with a magnetic recovery capacity

2020 ◽  
Vol 13 (03) ◽  
pp. 2051013 ◽  
Author(s):  
Xiaohuan Wang ◽  
Zhiming Shi ◽  
Jun Wang ◽  
Tao Zhao ◽  
Guojun Ji ◽  
...  
Keyword(s):  
Electrostatic Interactions ◽  
Adsorption Mechanism ◽  
Selective Adsorption ◽  
Dye Adsorption ◽  
Order Model ◽  
Efficient Removal ◽  
Recovery Capacity ◽  
Pseudo Second Order ◽  
Adsorption Quantity ◽  
Mb Adsorption

Two different morphologies of FeTiO3 (nanopowders and nanosheets) were synthesized for the selective and efficient removal of Congo red and methylene blue dyes. The FeTiO3 samples were extensively performed by XRD, TEM, EDS, XPS, BET, UV-Vis, zeta potential, FTIR, and VSM analysis. The experimental data showed that FeTiO3 nanopowders (FTO-P) and FeTiO3 nanosheets (FTO-S) were mesoporous, and each had CR adsorption quantity of 110.68[Formula: see text]mg/g and 95.33[Formula: see text]mg/g, respectively. Although FTO-S had an excellent adsorption of 76.87[Formula: see text]mg/g for MB, FTO-P showed almost no MB adsorption. The studies indicated that adsorption conform to pseudo-second-order model. The electrostatic interactions and hydrogen bonding were deemed to the mainly adsorption mechanism. The magnetic properties of samples facilitated their recovery from solution after adsorption. The study shows that FeTiO3 was an excellent adsorbent due to its remarkable and selective adsorption performance and easy magnetic separation from aqueous solution.

scholarly journals Study on the adsorption of Rhodamine B on MoS2/RGO composite

2020 ◽  
Vol 9 (4) ◽  
pp. 57-63
Author(s):  
Trang Phan Thi Thuy ◽  
Tam Truong Thanh ◽  
Vien Vo ◽  
Lien Nguyen Hong
Keyword(s):  
Room Temperature ◽  
Adsorption Process ◽  
Organic Dyes ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Langmuir Adsorption ◽  
Reduced Graphene ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Oxide Composite Material

In this study, MoS2/RGO (reduced graphene oxide) composite material was synthesized and tested for adsorption of RhB in water. The adsorption studies were carried out at room temperature and the effects of pH, amount of adsorbents, concentration of adsorbate and time of adsorption on the adsorption were measured. In addition, the dynamics of the adsorption process was also investigated. The results showed that the MoS2/RGO composite displayed toward RhB with maximum adsorption capacity reaching q = 57.79 mg/g at pH = 3.54 and the adsorption process follows the Langmuir adsorption isotherm with the pseudo-second-order model. Findings from this research indicated that the graphene based semiconductor MoS2/RGO composite could be considered a promising adsorbent for removal of organic dyes from waste waters.

Zinc Chloride-activated Waste Carbon Powder for Decolourization of Methylene Blue

2014 ◽  
Vol 67 (2) ◽  
Author(s):  
Muhammad Abbas Ahmad Zaini ◽  
Ting Chiew Ngiik ◽  
Mohd. Johari Kamaruddin ◽  
Siti Hamidah Mohd. Setapar ◽  
Mohd. Azizi Che Yunus
Keyword(s):  
Methylene Blue ◽  
Surface Area ◽  
Activated Carbons ◽  
Carbon Powder ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Mixed Features ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Langmuir And Freundlich Models

Waste carbon powder from pyrolysis of discarded tyre was converted into activated carbon for decolourization of metylene blue (MB). The precursor was activated using ZnCl2 (ZC), recycled ZnCl2 solution from the earlier activation (RC), and irradiated water (MC). Activated carbons were characterized according to surface area and morphology. The values of surface area were recorded as 288, 104 and 113 m2/g for ZC, RC and MC, respectively. The decolourization of MB was observed to have the following order: ZC>MC>RC. The maximum adsorption capacity of MB by ZC was found to be 154 mg/g. Adsorption data for all activated carbons studied obeyed Redlich-Peterson isotherm for which the process could be described as mixed features of Langmuir and Freundlich models. The kinetics data were well-fitted to pseudo-second-order model, suggesting the chemisorption process.

scholarly journals Grewia spp. Biopolymer as Low-Cost Biosorbent for Hexavalent Chromium Removal

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
G. P. Kofa ◽  
G. R. Nkoue Ndongo ◽  
M. B. Kameni Ngounou ◽  
M. N. Nsoe ◽  
E. V. Amba ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Low Cost ◽  
Infrared Spectrometry ◽  
X Ray Diffraction ◽  
Order Model ◽  
Solution Ph ◽  
Batch Mode ◽  
Pseudo Second Order ◽  
Langmuir And Freundlich Models

In this study, Grewia spp. biopolymer was utilized as a biosorbent for elimination of hexavalent chromium from water. Fourier-transform infrared spectrometry (FTIR) and X-ray diffraction (XRD) were performed for characterization of the biosorbent. Experiments were conducted in a batch mode at room temperature (25 ± 2°C) and agitation speed of 100 rpm to determine the influence of biosorbent dose, contact time, Cr(VI) concentration, and initial solution pH. It was found that equilibrium was attained in 50 min. A pseudo-first-order model suited well than a pseudo-second-order model. Biosorption capacity of Grewia spp. biopolymer increased with increase in concentration and depended on the solution pH. Langmuir and Freundlich models described experimental data very well. These findings showed that Grewia spp. biopolymer can serve as a biosorbent for elimination of Cr(VI) from water.

scholarly journals Equilibrium and Kinetics Studies of Gentian Violet Dye Adsorption on to Activated Carbon Prepared From Aldhnan Hull

2017 ◽  
Vol 28 (1) ◽  
pp. 89
Author(s):  
Khudhair A. Kareem
Keyword(s):  
Activated Carbon ◽  
Gentian Violet ◽  
Equilibrium Constants ◽  
Dye Adsorption ◽  
Second Order ◽  
Point Of Zero Charge ◽  
Order Model ◽  
Batch Mode ◽  
Pseudo Second Order ◽  
Second Order Model

The present study investigated the key parameters and mechanism affecting the removal of Gentian Violet(GV) dye from aqueous medium, using Activated Carbon(AC) produced from hull of Aldhnan. The AC characterized by FTIR spectra to indicate the surface Characteristic groups of adsorbent affect the adsorption. The pH at point of zero charge showed the anionic nature of adsorbent surface and by using batch mode, the study considering the typical condition for adsorption of GV dye by the AC such as; effect of initial dye concentration, pH and contact time. The adsorption kinetics and equilibrium constants was achieved at 305K and the Langmuir isotherm model fit for the equilibrium data better than Freundlich model. Kinetics of adsorption was studied by testing the data in the pseudo first order (Lagergren Equation) and pseudo second order model and the adsorption of GV dye onto AC obeyed pseudo second order model. Thermodynamic studies exhibit that the adsorption reaction is endothermic in nature and spontaneous.

scholarly journals Development of activated carbon from Eichhornia Crassipes via chemical activation and its application to remove a synthetic dye

2019 ◽  
Vol 9 (5) ◽  
pp. 4394-4400 ◽  
Keyword(s):  
Activated Carbon ◽  
Eichhornia Crassipes ◽  
Functional Group ◽  
Adsorption Process ◽  
Chemical Activation ◽  
Order Model ◽  
Freundlich Model ◽  
Isotherm Study ◽  
Pseudo Second Order ◽  
Mb Adsorption

Dyes wastewater is listed as one of the largest water polluter in this world and cause problems to the environment as well as human health. The present study aims to investigate the adsorption of methylene blue, a cationic dye commonly used in industries by activated carbon derived from the water hyacinth stem (Eichhornia crassipes (Mart.) Solms). The removal of MB solution was affected by some parameters such as dosage, contact time, pH, and initial dye concentration. The present study showed that the optimum condition for the adsorption process was pH 7, the adsorbent dosage at 0.8 g with the equilibrium was reached at 100 minutes. However, there is no significant adsorption in the effect of pH. It was found that the best correlation of kinetic with the MB adsorption was the pseudo-second-order model, while the isotherm study was well represented with the Freundlich model. The porosity of adsorbent was enhanced after carbonization process. The functional group presence on the surface of adsorbent including alcohols, carboxyl and carbonyl were also contributed to the effectiveness of adsorption process.

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