Catalytic Degradation of Methyl Blue in Wastewater by Hematite

2012 ◽  
Vol 518-523 ◽  
pp. 2414-2417 ◽  
Author(s):  
Zhuan Nian Liu ◽  
Xiao Xue Zhang ◽  
Lin Zhao
Keyword(s):  
Reaction Time ◽  
Heterogeneous Catalyst ◽  
Fenton Reaction ◽  
Ph Value ◽  
Reaction System ◽  
Catalytic Degradation ◽  
Operating Conditions ◽  
Methyl Blue ◽  
Orthogonal Experiments ◽  
Wide Range

In this paper, catalytic degradation of simulated methyl blue in wastewater was investigated using hematite as heterogeneous catalyst in like-Fenton reaction. Through single factor experiments, the effects of the H2O2 dosage, the hematite dosage, initial pH value and reaction time on methyl blue catalytic degradation were studied. The results showed that as the amount of hematite, H2O2 dosage and reaction time increases, the degradation increases, more than a certain degradation value , the trend decreases and tends to stabilize. The optimal operating conditions determined by orthogonal experiments are as following: hematite dosage was 3g/L, H2O2 dosage was 3mL/L, and 4h at pH=9.The Fenton reaction system of hematite as heterogeneous catalyst has a wide range of pH, in the range of 3 to 11 have better removal effect, and generally more than 85%.

scholarly journals A mini review: Optimal dye removal by fenton process catalysed with waste materials

2020 ◽  
Author(s):  
Aleksandra Kulić Mandić ◽  
◽  
Milena Bečelić-Tomin ◽  
Đurđa Kerkez ◽  
Gordana Pucar Milidrag ◽  
...  
Keyword(s):  
Value Chain ◽  
Fenton Reaction ◽  
Dye Removal ◽  
Ph Value ◽  
Bottom Ash ◽  
Point Of View ◽  
Industrial Wastes ◽  
Waste Materials ◽  
Wide Range ◽  
Disposal Cost

Large quantities of solid waste from different industries are commonly disposed in landfills, where can generate wide range of environmental problems. Therefore, the aim of this paper is to give insight on the usage of various waste materials as oxidation catalysts in different Fenton processes for dye removal. In that manner the circular value chain of these materials will be reinforced, obtaining disposal cost reduction and further value addition. Some of industrial wastes (fly ash, electric arc furnace dust, red mud, coal bottom ash, activated carbon from biomass, etc.) that have been used to catalyse Fenton reaction in various researches are reviewed from optimization point of view. Both types of optimization, one-factor-at-a-time (OFAT) and response surface methodology (RSM) are investigated. The study revealed that factors as catalyst concentration, pH value, hydrogen peroxide concentration, dye concentration and reaction time are main factors that influence final Fenton capacity as oxidation process catalysed with reviewed waste materials.

Study on Catalytic Degradation of Diesel Pollution in Seawater by Laccase

2013 ◽  
Vol 781-784 ◽  
pp. 2324-2327
Author(s):  
Xu Zheng ◽  
Xiao Cai Yu ◽  
Yun Qing Liu ◽  
Xiao Xv ◽  
Jin Fang Chen
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Sea Water ◽  
Oil Pollution ◽  
Ph Value ◽  
Degradation Process ◽  
Catalytic Degradation ◽  
Initial Concentration ◽  
Optimization Study ◽  
Optimum Reaction

Sea water joining diesel was selected to prepare simulated marine oil pollution. With the target of removing diesel from seawater, the influence of various factors on the laccase-catalyzed degradation process was discussed. The experimental results show that the laccase-catalyzed degradation process was significantly affected by laccase dosage, reaction temperature, reaction time, pH of the solution and initial concentration of diesel in the oily wastewater. A systematic optimization study was carried out through a orthogonal test on the basis of the results of the single-factor experiments,and the optimum reaction conditions of laccase catalytic degradation diesel pollutants in seawater was determined. The results indicate that under the conditions of diesel initial concentration of 0.1g/L, laccase dosage of 8mg/L, pH value of 6, the reaction temperature of 25°C and the reaction time of 4h, laccase catalytic degradation rate of diesel pollution can be up to 63.85%.

scholarly journals Removal of aniline from aqueous solutions by activated carbon coated by chitosan

2015 ◽  
Vol 5 (4) ◽  
pp. 610-618 ◽  
Author(s):  
Qian Liu ◽  
Lujie Zhang ◽  
Pan Hu ◽  
Ruihua Huang
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Ph Value ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Order Kinetic ◽  
Factors Affecting ◽  
Adsorbent Dosage ◽  
Wide Range ◽  
Carbon Coated

In this work, activated carbon (AC) coated by chitosan was synthesized and characterized by Fourier transform infrared spectrophotometer and scanning electron microscope (SEM) techniques. The removal of aniline from aqueous solutions by AC coated by chitosan was investigated. The factors affecting the adsorption of aniline onto AC coated by chitosan, including the ratio of AC to chitosan, adsorbent dosage, pH value of solution, initial aniline concentration, and contact time were evaluated. These results showed that the optimum operating conditions were: the ratio of AC to chitosan = 0.5, adsorbent dosage = 0.2 g, and the adsorption of aniline from aqueous solutions had better removal in the concentration range of 20–50 mg/L. This adsorbent allowed high removal toward aniline in a wide range of pH. The equilibrium time was 100 minutes. The Freundlich model exhibited better correlation of the equilibrium adsorption data. The pseudo-second-order kinetic equation could better describe the kinetic behavior of aniline adsorption.

Preparation of Ultrafine BaTiO3 and SrTiO3 Powders from Na2-xHxTi3O7 Nanowires via Hydrothermal Processing

2006 ◽  
Vol 11-12 ◽  
pp. 603-606 ◽  
Author(s):  
Tian Hao Ji ◽  
Mao Yu Tang ◽  
Guan Rao Liu ◽  
Xing Yi Qi
Keyword(s):  
Reaction Time ◽  
Ph Value ◽  
Reaction System ◽  
Average Diameter ◽  
Hydrothermal Processing ◽  
Ultrafine Powders ◽  
Hydrothermal Route ◽  
Sodium Hydrogen ◽  
Measurement Results ◽  
Titanate Nanowires

BaTiO3 and SrTiO3 ultrafine powders are synthesized from sodium hydrogen titanate nanowires using hydrothermal route. Their preparation and purity depend strongly on the pH value of reaction system (the amount of added alkaline). Under the reaction condition of strong alkaline, the BaTiO3 phase can be obtained, but the SrTiO3 phase can not be easily prepared. Without the addition of any alkaline, the pure SrTiO3 phase can be synthesized. Reaction time also affects on the purity of BaTiO3 phase. Below 15 h of reaction time at reaction temperature 180°C, pure BaTiO3 phase can not be prepared. SEM measurement results show that the average diameter of BaTiO3 powders is about 200 nm and that of SrTiO3 submicrorods is about 300 nm. Their Raman spectra further demonstrate that the prepared products are BaTiO3 and SrTiO3 phases.

scholarly journals PENGARUH SUHU REAKSI, KECEPATAN PENGADUKAN DAN WAKTU REAKSI PADA PEMBUATAN SABUN PADAT DARI MINYAK KELAPA (Cocos nucifera L.)

2019 ◽  
Vol 8 (1) ◽  
pp. 11-17
Author(s):  
Rosdanelli Hasibuan ◽  
Fransiska Adventi ◽  
Rahmad Parsaulian Rtg
Keyword(s):  
Reaction Time ◽  
Moisture Content ◽  
Reaction Temperature ◽  
Ph Value ◽  
Cocos Nucifera ◽  
Coconut Oil ◽  
Operating Conditions ◽  
Animal Fats ◽  
Cocos Nucifera L ◽  
Impeller Type

Soap is a cleanser made by chemical reactions between sodium hydroxide or potassium hydroxide with fatty acids from vegetable oils or animal fats. Soaps can be made by several methods, namely saponification and neutralization methods, in this study carried out by saponification method. In the saponification method there are several problems namely operating conditions which include reaction temperature, stirring speed and stirring time. Therefore, need to do research to determine the best conditions of saponification reaction, namely reaction speed, operating temperature and reaction time using an impeller type multiple pitch blade turbine with research variables reaction temperature 60 oC, 70 oC, and 80 oC, stirring speed 300 rpm,400 rpm and 500 rpm and reaction time of 45minutes, 60 minutes, and 75 minutes. Saponification reaction is carried out by heating coconut oil and inserting 30% NaOH slowly and then stirring with a multiple pitch blade stirrer. The product will be analyzed by testing alkaline levels, moisture content and pH of the soap. The best operating conditions obtained from this study were at a temperature of 70 oC, reaction time of 60 minutes, stirring speed of 400 rpm with a pH value of 9.4 and an alkaline level of 0.073 and a moisture content of 9.8.

Orthogonal Experiments for Kaolin Bleaching by Using Sodium Dithionite and Sulfuric Acid

2014 ◽  
Vol 968 ◽  
pp. 116-121
Author(s):  
Jin Tang Li ◽  
Xue Zeng ◽  
Chuan Hai Gan ◽  
Shi Qiu ◽  
Rong Yi Chen ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Great Improvement ◽  
Ph Value ◽  
Sodium Dithionite ◽  
Processing Conditions ◽  
Liquid Ratio ◽  
Bleaching Process ◽  
Orthogonal Experiments

The quality of the kaolin is always measured by iron contents since this element gives undesirable reddish color which limits the usage of this type of minerals. Reducing the iron contents to increase the value of kaolin by bleaching process is investigated. The effects of factors which can improve the whiteness of kaolin have been studied. The dosage of sodium dithionite, pH value, solid-to-liquid ratio and reaction time were chose as factors based on mono-factor experimental results. Orthogonal experiments were carried out and the optimum processing conditions of the reductive bleaching were obtained as the dosage of sodium dithionite 3%, pH 2, solid-to-liquid ratio 1:3 and reaction time 45min. After bleaching process described above, we obtained a great improvement in the whiteness from 69.93% to 81.31% and a decrease of Fe2O3 content from 0.52% to 0.40% of the kaolin.

Treatment of Pharmaceutical Wastewater by Micro-Electrolysis and Fenton Oxidation Process

2011 ◽  
Vol 356-360 ◽  
pp. 1622-1625 ◽  
Author(s):  
Chong Hao Huang ◽  
Meng Xing Cao ◽  
Jun Hong Luo ◽  
Chao Zhang
Keyword(s):  
Reaction Time ◽  
Oxidation Process ◽  
Ph Value ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Fenton Process ◽  
Mass Ratio ◽  
Pharmaceutical Wastewater ◽  
Initial Ph ◽  
Fenton Oxidation Process

Pharmaceutical wastewater was treated by micro-electrolysis and Fenton process.The aim of this research was to optimize operating parameters in micro-electrolysis and Fenton process. Effectiveness of important process parameters such as mass ratio of iron to carbon, the initial pH, reaction time and H2O2 dosage on the performance of micro-electrolysis and Fenton process were investigated. The results show that the removal efficiency of pharmaceutical wastewater chemical oxygen demand (COD) could reach 37.3% at the optimal pH of 4 with the iron to carbon ratio of 1:1 after 80 min treatment. The operating conditions of Fenton process are 0.5% of H2O2 dosage, the pH value of 4 and the reaction time of 180 min. The pharmaceutical wastewater COD removal could reach 79.4%.

scholarly journals Removal of Basic Blue-41 dye from Water by Stabilized Magnetic Iron Nanoparticles on Clinoptilolite Zeolite

2020 ◽  
Vol 71 (2) ◽  
pp. 218-229 ◽  
Author(s):  
Shirin Afshin ◽  
Yousef Rashtbari ◽  
Mehdi Vosoughi ◽  
Rabia Rehman ◽  
Bahman Ramavandi ◽  
...  
Keyword(s):  
Reaction Time ◽  
Adsorption Process ◽  
Cost Effective ◽  
Operating Conditions ◽  
Process Efficiency ◽  
Freundlich Model ◽  
Initial Concentration ◽  
Wide Range ◽  
Pseudo Second Order ◽  
Nanocomposite Adsorbent

In this work, Zeolite/Fe3O4 nanocomposite used for adsorption of Blue 41 cationic dye from aqueous solutions in a wide range of concentrations. Analyzes of FTIR, XRD, FESEM, VSM and XRF have confirmed the nature and the structure of Zeolite/Fe3O4 nanocomposite adsorbent. The obtained results and analyzes determined that adsorption process efficiency increases by increasing reaction time, pH and amount of adsorbent and versus, increasing dye initial concentration causes significant decrease of adsorption efficiency. The obtained results of adsorption of isotherm and kinetics study illustrated that data follows Freundlich model and pseudo second order kinetics. Under optimum conditions of pH = 9, dye initial concentration of 100 mg/L, adsorbent dose of 3 g/L and reaction time of 60 min, removal efficiency was obtained 71.4 %. Totally results showed that Zeolite/Fe3O4 nanocomposite can be used by scrutiny of operating conditions of the adsorption process as a adsorbent with high effectiveness and availability, eco-friendly and cost-effective in order to removing dye from waste water of different industries.

Extraction of Copper and Cobalt from Nickel Chloride Solution with N235

2011 ◽  
Vol 361-363 ◽  
pp. 615-618 ◽  
Author(s):  
Xue Jiao Zhou ◽  
Wen Tang Xia ◽  
Jian Guo Yin
Keyword(s):  
Reaction Time ◽  
Chloride Solution ◽  
Volume Fraction ◽  
Ph Value ◽  
Chloride Concentration ◽  
Nickel Chloride ◽  
Operating Conditions ◽  
Phase Ratio ◽  
Cobalt Iron ◽  
Counter Current

Copper and cobalt were extracted from nickel chloride solution with N235. The various parameters considered in this work were N235concentration, reaction time, phase ratio (O/A) and pH value. The optimum conditions are determined that concentration of N235 in organic phase is 40% (volume fraction), the phase ratio (O/A) is 1:2, pH value is 2~4, chloride concentration is 5.76 mol/L and the reaction time is 4 min. Under the optimized operating conditions, cobalt and copper extracted effectively and the extraction rates at the single stage reached 90% and 97%, respectively. After five stage continuous counter-current process, the concentrations of copper, cobalt, iron in the raffinate are less than 0.0008 g/L，0.008 g/L and 0.0025 g/L, respectively, and the recovery of nickel is higher than 92%. The separation effect is steady and satisfied for the electrolysis.

Decolorization of Mordant Red 15 Dye in Water by Potassium Ferrate (VI)

2013 ◽  
Vol 838-841 ◽  
pp. 2445-2448 ◽  
Author(s):  
Zheng Hua Wang ◽  
Bo Zhi Ren ◽  
Pu Wang
Keyword(s):  
Reaction Time ◽  
Fenton Reaction ◽  
Ph Value ◽  
Removal Rate ◽  
Dye Decolorization ◽  
High Ability ◽  
Potassium Ferrate ◽  
Optimum Conditions ◽  
Ph Values ◽  
Optimum Ph

Decolorization of the Mordant red 15 dye in water was investigated in laboratory-scale experiments using potassium ferrate (VI). The effect of corresponding parameters such as reaction time, concentration of potassium ferrate, pH values and the addition of H2O2 were considered in the experiments. The results indicated that about 78% dye decolorization was obtained in less than 30 min under optimum conditions. The pH values and concentration of ferrate (VI) were correlated with color removal rate of Mordant red 15 dye. The optimum pH value and ferrate (VI) concentration are 5 and 450 mg/L, respectively. Addition of H2O2 could initiate the Fenton reaction and result in 84.46% decolorization of dye in 30 min. Due to high ability of oxidizing and flocculation, potassium ferrate (VI) is an effect way for treatment of dyes in water.

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