scholarly journals Influence of surface modification by sulfuric acid on coking coal's adsorption of coking wastewater

2017 ◽  
Vol 76 (3) ◽  
pp. 555-566 ◽  
Author(s):  
Lihui Gao ◽  
Hong Wen ◽  
Quanzhi Tian ◽  
Yongtian Wang ◽  
Guosheng Li
Keyword(s):  
Sulfuric Acid ◽  
Zeta Potential ◽  
Surface Area ◽  
Pore Volume ◽  
Ash Content ◽  
Raw Material ◽  
Acid Activation ◽  
Coking Wastewater ◽  
Hydrophobic Properties ◽  
Coking Coal

Coking coal, the raw material of a coke plant, was applied to the adsorption of coking wastewater. In this study, coking coal was directly treated with sulfuric acid to improve its surface properties and adsorption ability. Acid treatment was carried out at various concentrations, by varying from 0.001 to 1 mol/L. The samples were characterized by ash content analysis, scanning electron microscope (SEM), N2 adsorption-desorption analysis, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), wettability analysis, and zeta potential analysis. These results demonstrated that H+ could react with inorganic minerals, which resulted in a significant variation of the chemical composition and the structure of coal surface. Furthermore, both the ash content and the surface content of O = C-O, C = O and C-O groups declined gradually as the concentration of sulfuric acid increased, while the surface area and pore volume of micropore, the lipophilic and hydrophobic properties, and zeta potential magnitude increased, resulting in enhanced hydrophobic and Van der Waals' forces between the fine coal and organic pollutants. Characterization modification showed a better performance in adsorption, the removal rate enhanced from 23% to 42% after treated by 1 mol/L sulfuric acid. It was concluded that the acid activation modified the lipophilic and hydrophobic properties, the surface charge properties, surface area and pore volume, the content of oxygen functional groups, all of which could be potentially useful in wastewater adsorption.

Preparation of Adsorbent from Blue Coke Powder and its Application in Coking Wastewater

2011 ◽  
Vol 695 ◽  
pp. 553-556
Author(s):  
Yu Hong Tian ◽  
Xin Zhe Lan ◽  
Qiu Li Zhang ◽  
Juan Qin Xue ◽  
Yong Hui Song ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Removal Rate ◽  
Nitrogen Concentration ◽  
Ammonia Nitrogen ◽  
Raw Material ◽  
Coking Wastewater ◽  
Adsorption Time ◽  
Coke Powder

The low-cost blue coke industrial by-product, blue coke powder was used as raw material for the production of porous carbons adsorbent by steam activating at temperature of 800°C under the atmosphere of N2 for 60 minutes. The specific surface area and pore properties of the adsorbent were characterized by using N2 adsorption-desorption isotherms. Furthermore, the adsorption effects of the adsorbent for ammonia nitrogen in coking wastewater were investigated in terms of particle size, dosage of absorbent and adsorption time. The results show that the specific surface area is 620.94m2/g, the total pore volume is 0.4442cm3/g and the average mesopore size is 4.5808nm, the adsorbent possesses predominant mesoporous structures. In aeration, the removal rate of ammonia nitrogen can reach to 39.5% under the conditions of the ammonia nitrogen concentration of 625mg/L, the dosage of adsorbent 10g/L at the adsorption time of 60 minutes.

Optimization of Experimental Conditions for the Preparation of High Specific Surface Area Bamboo-Based Activated Carbon

2015 ◽  
Vol 1090 ◽  
pp. 154-159
Author(s):  
Sheng Zhou Zhang ◽  
Hong Ying Xia ◽  
Li Bo Zhang ◽  
Jin Hui Peng ◽  
Jian Wu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Total Pore Volume ◽  
High Specific Surface Area ◽  
Raw Material ◽  
Experimental Conditions ◽  
Average Pore

Bamboo as the raw material is carbonized to prepare high specific surface area activated carbon by microwave heating under nitrogen atmosphere in our present work. Influences of activation agents on the preparation of activated carbon are studied. The results show that activation agents have a significant influence on the preparation of activated carbon. Under the heating time of 15 min, the adsorption capacity of the activated carbon prepared utilizing KOH as activation agent is the best. When the KOH/C ratio is 4, the iodine number and yield of activated carbon are 2298 mg/g and 39.82%, respectively. The BET specific surface area, total pore volume and average pore diameter of activated carbon are 3441 m2/g, 2.093 ml/g and 2.434 nm, respectively. The micropore volume of 1.304 ml/g is 62.30% of total pore volume, indicating that the activated carbon is microporous activated carbon.

Study on the Industrial Wastewater Treatment by Modified Bentonite

2012 ◽  
Vol 182-183 ◽  
pp. 323-327 ◽  
Author(s):  
Hong Shao ◽  
Zhi Fang Zhang ◽  
Ning Cao
Keyword(s):  
Surface Area ◽  
Removal Rate ◽  
Mixing Time ◽  
Monosodium Glutamate ◽  
Basic Structure ◽  
Raw Material ◽  
Coking Wastewater ◽  
High Concentration ◽  
Modified Bentonite ◽  
Cod Removal Rate

The natural bentonite as raw material, chitosan as a modifier to prepare chitosan modified bentonite. The use of modified bentonite, each dealing with a high concentration of COD monosodium glutamate (MSG)wastewater and coking wastewater .The optimal conditions: mixing time : 10 ~ 12 min;centrifugation time :25 ~ 30min; PH: 8.5 ~ 9.5; dosage: 10~14g / L. The results showed that the treatment of modified bentonite is better than the bentonite and chitosan. The COD removal rate of MSG wastewater and coking wastewater were 60.1% and 82.3%. So the treatment of coking wastewater is efficiency.. By scanning electron microscopy, surface area and X-ray diffraction analysis shows that modification does not change the basic structure of the bentonite only increased the specific surface area of bentonite, and the adsorption capacity of pollutants.

Effect of different pH coking wastewater on adsorption of coking coal

2015 ◽  
Vol 73 (3) ◽  
pp. 582-587 ◽  
Author(s):  
Lihui Gao ◽  
Shulei Li ◽  
Yongtian Wang
Keyword(s):  
Zeta Potential ◽  
Organic Contaminants ◽  
Ph Value ◽  
Oxygen Demand ◽  
Total Pore Volume ◽  
Ammonia Removal ◽  
Phenol Removal ◽  
Coking Wastewater ◽  
Coking Coal ◽  
Bet Analysis

H2SO4 has an effect on the sorption of organic contaminants by coking coal (CC) in wastewater. This paper focused on the effect of pH on the removal of chemical oxygen demand (COD), phenols and ammonia. UV-vis spectra, Fourier transform infrared spectra, zeta potential and Brunauer, Emmett and Teller (BET) analysis were investigated to characterize the changes of CC properties and coking wastewater (CW) at different pH values. The results showed that the COD and phenol removal efficiencies increased with decreasing pH value, while the ammonia removal efficiency was decreased gradually. A new transmittance band in the region of 340–600 cm−1 was observed in UV-vis spectra of CW in acidic condition. The absolute value of the zeta potential as the solution was gradually increasing with the increasing of pH value. Surface area and total pore volume of CC which was immersed in acidic solutions measured by BET were much higher than that of raw CC. CC has a greater adsorption capacity to organic pollution in the acidic solution mainly by van der Waals forces and hydrogen bonding.

scholarly journals ACID ACTIVATION OF PRRENJAS CLAY MINERAL

2018 ◽  
Vol 4 (7) ◽  
Author(s):  
Altin Mele ◽  
Krenaida Taraj ◽  
Arjan Korpa
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Clay Mineral ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Gas Adsorption ◽  
Exchange Capacity ◽  
Acid Activation ◽  
Composition Structure ◽  
Adsorption Desorption

Prrenjas clay mineral is found in southeast Albania and has a high content on bentonite. Theinfluence of the sulphuric acid activation on the composition, structure and surface properties ofPrrenjas clay mineral is investigated in this study by means of elemental chemical analysis, X-RayDiffractometry, IR Spectroscopy and gas adsorption-desorption measurement. H2SO4concentrations of 0.143 M, 0.232 M, 0.371 M, 0.537 M, 0.734 M, 0.927 M and 1.456 M were used inthe treatment of samples. The treatment by increasing the acid concentration brings the leaching ofAl3+, Fe2+, Mg2+ from the clay structure. The specific surface area and the pore volume of the claysamples increases respectively from 83 m2/g and 0.069 cm3/g for the untreated clay to 420 m2/g and0.384 cm3/g for the clay mineral treated with 1.456 M H2SO4 solution. New mesopores were createdduring the acid activation mainly in the range of 2 – 8 nm. For the samples treated with 0.927 Mand 1.456 M solutions the increase in specific surface area and pore volume is very high. Thecationic exchange capacity decreases steadily with the concentration of H2SO4 used for thetreatment.

The Influence of Acid Treatment on the Nanostructure and Textural Properties of Bentonite Clays

2005 ◽  
Vol 494 ◽  
pp. 339-344 ◽  
Author(s):  
Z. Vuković ◽  
A. Milutinović-Nikolić ◽  
J. Krstić ◽  
A. Abu-Rabi ◽  
T. Novaković ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Acid Concentration ◽  
Pore Volume ◽  
Acid Treatment ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Acid Activation ◽  
Bentonite Clays

The nanostructure and textural properties of acid-activated bentonite clays from the Bogovina coalmine were investigated. The acid activation was performed with HCl in the concentration range 1.5-7.5 M. The atomic force microscopy followed by image analysis was used in order to establish the influence of the acid treatment on the size of bentonite particles. Nitrogen adsorption-desorption isotherms at -196 °C were used to estimate the specific surface area, pore volume and pore size distribution. The acid treatment reduces the size of bentonite particles and increases the specific surface area and pore volume of the investigated bentonites. These effects are improved by increasing the acid concentration up to 4.5 M HCl. Further increase in acid concentration does not result in development of new porous structure.

Pineapple Biorefinery in Costa Rica

2019 ◽  
Author(s):  
José Roberto Vega-Baudrit ◽  
Melissa Camacho
Keyword(s):  
Sulfuric Acid ◽  
Costa Rica ◽  
Hydrochloric Acid ◽  
Zeta Potential ◽  
Hypochlorous Acid ◽  
Raw Material ◽  
Pineapple Peel ◽  
Hydrolysis Of

Pineapple peel’s biomass was used as a raw material for nanocellulose extraction. The raw material was a residue from the fruit industry from Costa Rica. The nanocellulose was obtained by hydrolysis of the pineapple peel residues after NaOH and hypochlorous acid with hydrochloric acid (HCl) for the microcellulose formation and with sulfuric acid (H2SO4) for nanocellulose formation. Properties were analyzed by FTIR, TGA, DLS, zeta potential, AFM and SEM. The results showed that nanocellulose with a fiber like structure was preferentially obtained after 60 min in contact with sulfuric acid.

XRF and nitrogen adsorption studies of acid-activated palygorskite

Clay Minerals ◽  
2010 ◽  
Vol 45 (2) ◽  
pp. 145-156 ◽  
Author(s):  
Junping Zhang ◽  
Qin Wang ◽  
Hao Chen ◽  
Aiqin Wang
Keyword(s):  
Chemical Composition ◽  
Surface Area ◽  
Acid Concentration ◽  
Pore Volume ◽  
Great Influence ◽  
Nitrogen Adsorption ◽  
Acid Activation ◽  
Mesopore Volume ◽  
Acid Type ◽  
Adsorption Desorption

AbstractThe effects of acid activation on the chemical composition, surface area and pore structure of palygorskite from Xuyi (Jiangsu, P.R. China) were investigated systematically using X-ray fluorescence (XRF) and BET techniques. The palygorskite samples were activated with HCl, H2SO4 and H3PO4 of various concentrations at 80ºC for 4 h. The influences of acid concentration and acid type on the chemical composition, adsorption-desorption isotherms at 77 K, pore-size distribution, surface area and pore volume were studied in detail. The contents of most components of palygorskite decrease with increasing acid concentration except for Si and Ti. HCl shows a greater activation activity and its effect on the dissolution of components of palygorskite is greater than that of H2SO4 and H3PO4. It was found that 3 mol l–1 H3PO4 is a more efficient activator for increasing the number of micropores in palygorskite, whereas 12 mol l–1 HCl is more suitable for use in enhancing the number of meso- and macropores. The acid concentration and acid type have a great influence on the surface area and pore volume. HCl is the most effective at enhancing the external surface area and mesopore volume of palygorskite, whereas, H3PO4 is more suitable for use in improving the micropore surface and volume.

Comparison on Pore Development of Activated Carbon Produced from Scrap Tire by Hydrochloric Acid and Sulfuric Acid

2012 ◽  
Vol 626 ◽  
pp. 706-710 ◽  
Author(s):  
Athiwat Sirimuangjinda ◽  
Duangduen Atong ◽  
Chiravoot Pechyen
Keyword(s):  
Methylene Blue ◽  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Surface Area ◽  
Activated Carbons ◽  
Adsorption Properties ◽  
Bet Surface Area ◽  
Acid Activation ◽  
Scrap Tire ◽  
Methylene Blue Adsorption

Two activated carbons employing Scrap Tire as precursor were produced by using two different activating agents, HCl and H2SO4 (fixed impregnation ratio 1:1). Both of activated carbons were allowed by single-step to get difference carbonized at 500, 600 and 700°C in a muffle furnace for 1 h. Activated carbons differed with the physical structure, chemical and adsorption properties which were derived from Scanning Electron Microscope, and N2 adsorption/desorption isotherms. Batched sorption studies were performed to compare the iodine and methylene blue adsorption properties of two carbons. The carbon materials obtained from sulfuric acid activation of 500°C has BET surface area as high as 1066.70 m2/g, Methylene blue adsorption and Iodine number of 288.90 and 590.50 mg/g, respectively. The surface area and adsorption properties of carbon produced using sulfuric acid activation were higher than that produced using hydrochloric acid activation. The results suggest the feasibility of the process from the point of view of both porous texture and adsorption yield.

Influence of Surface Properties on the Viscosity of Titanium Dioxide Slurry

2012 ◽  
Vol 503-504 ◽  
pp. 516-519
Author(s):  
Zhi Qiang Luo ◽  
Jian Qiao Du
Keyword(s):  
Zeta Potential ◽  
Specific Surface ◽  
Surface Area ◽  
Surface Properties ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Total Pore Volume ◽  
Absolute Value ◽  
Low Viscosity ◽  
Particle Size Analyzer

The influence of surface properties, including fineness, total pore volume, specific surface area and zeta potential on viscosity of TiO2 slurry were studied. The viscosity and these surface properties of TiO2 samples were respectively measured by viscometer, standard sieve, specific surface area analyzer, particle size analyzer. The results show that with increase of fineness and absolute value of zeta potential, the viscosity of TiO2 slurry decrease gradually, but with increase of total pore volume and specific surface area, the viscosity of TiO2 slurry also increase. The suitable conditions in low viscosity of TiO2 slurry are as follows: fineness and absolute value of zeta potential is respectively greater than 0.1%, 70mV; total pore volume and specific surface area is respectively less than 0.05cc/g, 7.5m2/g

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