scholarly journals Decoloration of methylene blue simulated wastewater using a UV-H2O2 combined system

2011 ◽  
Vol 1 (1) ◽  
pp. 45-51 ◽  
Author(s):  
L. V. Jian-xiao ◽  
Cui Ying ◽  
Xie Guo-hong ◽  
Zhou Ling-yun ◽  
Wang Su-fen
Keyword(s):  
Methylene Blue ◽  
Ph Value ◽  
Order Kinetic ◽  
Combined System ◽  
Initial Stage ◽  
Optimum Ph ◽  
Initial Ph ◽  
Simulated Wastewater ◽  
Kinetics Of ◽  
Order Kinetic Equation

Methylene blue simulated wastewater was treated with a UV-H2O2 combined system. Influences of factors such as reaction time, initial pH value and H2O2 dosage were investigated, and the reaction kinetics of the process was explored. Results showed that the degradation of methylene blue happened only in the presence of both conditions: UV irradiation and H2O2 addition. Initial pH and H2O2 dosage had a remarkable influence on the degradation efficiency. Through several groups of univariate experiments, the optimum pH and H2O2 dosage of the photolysis process were found to be 4–5 and 0.165 mL 30% H2O2 per milligram of methylene blue, respectively. The photolysis process was relatively fast at the initial stage and, 20 min later, it was approximately in accordance with the first-order kinetic equation.

H2O2-assisted photolysis of reactive dye BES golden yellow simulated wastewater

2009 ◽  
Vol 60 (9) ◽  
pp. 2329-2336 ◽  
Author(s):  
Lv Jian-xiao ◽  
Xie Guo-hong ◽  
Yue Qing-ling ◽  
Zhang Li ◽  
Li Jian-min ◽  
...  
Keyword(s):  
Reactive Dye ◽  
Order Kinetic ◽  
Yellow Solution ◽  
Golden Yellow ◽  
Optimum Ph ◽  
Initial Ph ◽  
Simulated Wastewater ◽  
Kinetics Of ◽  
H2o2 Addition ◽  
Order Kinetic Equation

Reactive dye BES golden yellow simulated wastewater was treated with H2O2-assisted photolysis method. Influences of factors such as reaction time, initial pH and H2O2 dosage were investigated, and the reaction kinetics of the process were explored. Results showed that, the degradation of 200 mg/L BES golden yellow solution happened only in the presence of both conditions: UV irradiation and H2O2 addition. Initial pH and H2O2 dosage had remarkable influence on the removal efficiency of the dye. Through several groups of univariate experiments, the optimum pH and H2O2 dosage of the photolysis process were found to be 6–7 and 0.0375 mL 30% H2O2 per milligram of BES golden yellow, respectively. The photolysis process was approximately in accordance with the second-order kinetic equation.

The Photocatalytic Degradation of Methylene Blue Wastewater with Nanoscale Ferric Oxide as Catalyst

2011 ◽  
Vol 356-360 ◽  
pp. 1813-1818
Author(s):  
Yi Ren Zhu ◽  
Guang Chao Li ◽  
Qian Ping Zhang ◽  
Chong Tang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Light Source ◽  
High Voltage ◽  
Ferric Oxide ◽  
Ph Value ◽  
Order Kinetic ◽  
Mercury Lamp ◽  
Excitation Light ◽  
Simulated Wastewater

Nanoscale Ferric Oxide was prepared from natural hematite and characterized. Using it as catalyst, methylene blue-simulated wastewater was treated by photocatalytic degradation with high-voltage mercury lamp and sunlight as excitation light source. Main factors, including the preparation conditions and dosage of ferric oxide, pH value, reaction time and initial concentration of simulated wastewater, and their influence to treatment effect were discussed. Test results showed that at a pulverization time of 1.5h, calcination time of 2h at 500°C, initial methylene blue (MB) concentration of 20mg/L, pH=2 and a ferric oxide dosage of 0.01g/30ml, for both high-voltage mercury lamp and sunlight, MB wastewater was degraded effectively in lab-scale experiment; after 5h’s radiation, MB concentrations were reduced from 20mg/L to 0.51mg/L and 9.18mg/L respectively. With sunlight as the radiation light source, an enlarged experiment was done on a custom-built device, and MB concentration was reduced from 20mg/L to 0.11mg/L, which was significantly better than treatment results from lab-scale experiments and UV radiation. MB photocatatytic degradation reactions at different initial concentrations were in accordance with Lagergren’s pseudo-first-order kinetic equation. Spectral analysis of degradation products showed that MB molecules were degraded to inorganic ions.

scholarly journals Sorption Efficiency of a New Sorbent towards Cadmium(II): Methylphosphonic Acid Grafted Polystyrene Resin

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Nacer Ferrah ◽  
Omar Abderrahim ◽  
Mohamed Amine Didi ◽  
Didier Villemin
Keyword(s):  
Metal Ion ◽  
Ph Value ◽  
Ion Concentration ◽  
Methylphosphonic Acid ◽  
Order Kinetic ◽  
Elementary Analysis ◽  
Optimum Ph ◽  
Initial Ph ◽  
Pseudo Second Order ◽  
Polystyrene Resin

A new chelating polymeric sorbent has been developed using polystyrene resin grafted with phosphonic acid. After characterization by FTIR and elementary analysis, the new resin has been investigated in liquid-solid extraction of cadmium(II). The results indicated that phosphonic resin could adsorb Cd(II) ion effectively from aqueous solution. The adsorption was strongly dependent on the pH of the medium and the optimum pH value level for better sorption was between 3.2 and 5.2. The influence of other analytical parameters including contact time, amount of resin, metal ion concentration, and the presence of some electrolytes was investigated. The maximum uptake capacity of Cd(II) ions was 37,9 mg·g−1grafted resin at ambient temperature, at an initial pH value of 5.0. The overall adsorption process was best described by pseudo second-order kinetic. When Freundlich and Langmuir isotherms were tested, the latter had a better fit with the experimental data. Furthermore, more than 92% of Cd(II) could be eluted by using 1.0 mol·L−1HCl in one cycle.

scholarly journals Potential Biosorbent Derived fromCalligonum polygonoidesfor Removal of Methylene Blue Dye from Aqueous Solution

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Asma Nasrullah ◽  
Hizbullah Khan ◽  
Amir Sada Khan ◽  
Zakaria Man ◽  
Nawshad Muhammad ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Particle Size ◽  
Second Order ◽  
Blue Dye ◽  
Order Kinetic ◽  
Particle Size Analyzer ◽  
Initial Ph ◽  
Pseudo Second Order ◽  
Kinetics Of

The ash ofC. polygonoides(locally called balanza) was collected from Lakki Marwat, Khyber Pakhtunkhwa, Pakistan, and was utilized as biosorbent for methylene blue (MB) removal from aqueous solution. The ash was used as biosorbent without any physical or chemical treatment. The biosorbent was characterized by using various techniques such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The particle size and surface area were measured using particle size analyzer and Brunauer-Emmett-Teller equation (BET), respectively. The SEM and BET results expressed that the adsorbent has porous nature. Effects of various conditions such as initial concentration of methylene blue (MB), initial pH, contact time, dosage of biosorbent, and stirring rate were also investigated for the adsorption process. The rate of the adsorption of MB on biomass sample was fast, and equilibrium has been achieved within 1 hour. The kinetics of MB adsorption on biosorbent was studied by pseudo-first- and pseudo-second-order kinetic models and the pseudo-second-order has better mathematical fit with correlation coefficient value (R2) of 0.999. The study revealed thatC. polygonoidesash proved to be an effective, alternative, inexpensive, and environmentally benign biosorbent for MB removal from aqueous solution.

scholarly journals Silica Removal from a Paper Mill Effluent by Adsorption on Pseudoboehmite and γ-Al2O3

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2031
Author(s):  
Ruben Miranda ◽  
Isabel Latour ◽  
Angeles Blanco
Keyword(s):  
Paper Mill ◽  
Ph Adjustment ◽  
Paper Mill Effluent ◽  
Kinetics Studies ◽  
Silica Removal ◽  
Industrial Water Use ◽  
Optimum Ph ◽  
Initial Ph ◽  
Equilibrium And Kinetics ◽  
Kinetics Of

Effluent reuse is a common practice for sustainable industrial water use. Salt removal is usually carried out by a combination of membrane processes with a final reverse osmosis (RO). However, the presence of silica limits the RO efficiency due to its high scaling potential and the difficulty of cleaning the fouled membranes. Silica adsorption has many advantages compared to coagulation and precipitation at high pHs: pH adjustment is not necessary, the conductivity of treated waters is not increased, and there is no sludge generation. Therefore, this study investigates the feasibility of using pseudoboehmite and its calcination product (γ-Al2O3) for silica adsorption from a paper mill effluent. The effect of sorbent dosage, pH, and temperature, including both equilibrium and kinetics studies, were studied. γ-Al2O3 was clearly more efficient than pseudoboehmite, with optimal dosages around 2.5–5 g/L vs. 7.5–15 g/L. The optimum pH is around 8.5–10, which fits well with the initial pH of the effluent. The kinetics of silica adsorption is fast, especially at high dosages and temperatures: 80–90% of the removable silica is removed in 1 h. At these conditions, silica removal is around 75–85% (<50 mg/L SiO2 in the treated water).

scholarly journals The sorption of inorganic arsenic on modified sepiolite: Effect of hydrated iron(III)-oxide

2014 ◽  
Vol 79 (7) ◽  
pp. 815-828 ◽  
Author(s):  
Nikola Ilic ◽  
Slavica Lazarevic ◽  
Vladana Rajakovic-Ognjanovic ◽  
Ljubinka Rajakovic ◽  
Djordje Janackovic ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Arsenic Removal ◽  
Ph Value ◽  
Inorganic Arsenic ◽  
Arsenic Species ◽  
Deionized Water ◽  
Order Kinetic ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The sorption of inorganic arsenic species, As(III) and As(V), from water by sepiolite modified with hydrated iron(III) oxide was investigated at 25 ?C through batch studies. The influence of the initial pH value, the initial As concentrations, the contact time and types of water on the sorption capacity was investigated. Two types of water were used, deionized and groundwater. The maximal sorption capacity for As(III) from deionized water was observed at initial and final pH value 7.0, while the bonding of As(V) was observed to be almost pH independent for pH value in the range from 2.0 to 7.0, and the significant decrease in the sorption capacity was observed at pH values above 7.0. The sorption capacity at initial pH 7.0 was about 10 mg g?1 for As(III) and 4.2 mg g?1 for As(V) in deionized water. The capacity in groundwater was decreased by 40 % for As(III) and by 20 % for As(V). The Langmuir model and pseudo-second order kinetic model revealed good agreement with the experimental results. The results show that Fe(III)-modified sepiolite exhibits significant affinity for arsenic removal and it has a potential for the application in water purification processes.

scholarly journals The Removal of Methylene Blue Dye from Aqueous Solutions Using Activated and Non-Activated Bentonites

2003 ◽  
Vol 21 (5) ◽  
pp. 451-462 ◽  
Author(s):  
Sameer Al-Asheh ◽  
Fawzi Banat ◽  
Leena Abu-Aitah
Keyword(s):  
Methylene Blue ◽  
Ph Value ◽  
Sodium Dodecyl ◽  
Freundlich Isotherm ◽  
Blue Dye ◽  
Batch Adsorption ◽  
Ionic Surfactant ◽  
Methylene Blue Dye ◽  
X Ray Diffraction ◽  
Initial Ph

An improvement in the adsorption capacity of naturally available bentonite towards water pollutants such as Methylene Blue dye (MBD) is certainly needed. For this purpose, sodium bentonite was activated by two methods: (1) treatment with sodium dodecyl sulphate (SDS) as an ionic surfactant and (2) thermal treatment in an oven operated at 850°C. Batch adsorption tests were carried out on removing MBD from aqueous solution using the above-mentioned bentonites. It was found that the effectiveness of bentonites towards MBD removal was in the following order: thermal-bentonite > SDS-bentonite > natural bentonite. X-Ray diffraction analysis showed that an increase in the microscopic bentonite platelets on treatment with SDS was the reason behind the higher uptake of MBD. An increase in sorbent concentration or initial pH value of the solutions resulted in a greater removal of MBD from the solution. An increase in temperature led to an increase in MBD uptake by the bentonites studied in this work. The Freundlich isotherm model was employed and found to represent the experimental data well.

scholarly journals Comparison of sorption efficiency of natural and MnO2 coated zeolite for copper removal from model solutions

2021 ◽  
Vol 900 (1) ◽  
pp. 012003
Author(s):  
M Balintova ◽  
Z Kovacova ◽  
S Demcak ◽  
Y Chernysh ◽  
N Junakova
Keyword(s):  
Heavy Metals ◽  
Removal Efficiency ◽  
Ph Value ◽  
Batch Experiments ◽  
Modified Zeolite ◽  
Optimum Ph ◽  
Removal Of Heavy Metals ◽  
Initial Ph ◽  
Correlation Factors ◽  
Maximum Removal

Abstract Removal of heavy metals from the environment is important for living beings. The present work investigates the applicability of the natural and MnO2 - coated zeolite as sorbent for the removal of copper from synthetic solutions. Batch experiments were carried out to identify the influence of initial pH and concentration in the process of adsorption. A maximum removal efficiency of Cu(II) was observed in 10 mg/L for natural (95.6%) and modified (96.4%) zeolite, where the values was almost identical, but at concentration of 500 mg/L was the removal efficiency of modified zeolite three times higher. Based on the correlation factors R2, the Langmuir isotherms better describe the decontamination process than Freundlich. The optimum pH value was set at 5.0.

Study on Adsorption Properties of Different Dyes on Montmorillonite

2012 ◽  
Vol 454 ◽  
pp. 305-309 ◽  
Author(s):  
Ping Chen ◽  
Xian Jun Lu ◽  
Jun Qiu
Keyword(s):  
Methylene Blue ◽  
Ph Value ◽  
Carbon Chain ◽  
Adsorption Properties ◽  
Organically Modified ◽  
Optimum Ph ◽  
Before And After ◽  
Higher Temperature ◽  
Adsorption Amount ◽  
Acid Blue

Using Octadecyltrimethylammonium cations with long carbon chain to modify calcium montmorillonite samples, the adsorption properties of different dyes on montmorillonite before and after modification were investigated. Results showed that the basic dye of methylene blue was easily adsorbed by natual calcium montmorillonite, while the adsorption ability for acid blue and neutral blue was greatly improved when it was organically modified, and the adsorption amount increased with the increasing of modifier dosage. The adsorption ratio was influnced by reaction time, the temperature and the solution’s pH value. It suggested that the adsorption balance time was about 60min; higher temperature was good for acid blue adsorbed on organic montmorillonite, but neutral blue’s adsorption amount was greater at the room temperature; the optimum pH was 9 for methylene blue adsorption, while low pH was better for acid blue and neutral blue adsorption.

Study on the Kinetics of Adsorption of Cadmium by Chitosan

2010 ◽  
Vol 160-162 ◽  
pp. 1804-1809
Author(s):  
Qiang Bi ◽  
Juan Qin Xue ◽  
Ying Juan Guo ◽  
Yu Jie Wang ◽  
Yun Feng Xue
Keyword(s):  
Kinetic Equations ◽  
Adsorption Kinetic ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Ph Values ◽  
Optimum Ph ◽  
Pseudo Second Order ◽  
Simulated Wastewater ◽  
Isotherm Equations ◽  
Kinetics Of

The adsorption of cadmium in simulated wastewater by chitosan was investigated. The influence of temperature, contact time and pH on adsorption efficiency of cadmium was examined. Some related mathematical models were used in the fitting of experimental data. The results showed that at room temperature, the optimum pH of adsorption is between 4 and 7. At lower pH values, a strong competition existed between cadmium ions and protons for sorption sites and the sorption efficiency was decreased. After 60 minutes the adsorption equilibrium can be achieved. Chitosan is very effective at removing cadmium with the maximum adsorption capacity is 112.05mg•g-1. The adsorption kinetic curves agree with the pseudo-second-order adsorption kinetic equations and the adsorption isotherms could be well described by Langmuir isotherm equations.

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