scholarly journals Study on the treatment of phenol-containing wastewater by doping coal char

2022 ◽  
Vol 355 ◽  
pp. 02073
Author(s):  
Shuqin Wang ◽  
Zhiqiang Zhang ◽  
Jinghong Zhang ◽  
Xiao Zhang
Keyword(s):  
Adsorption Equilibrium ◽  
Coal Char ◽  
Coal Pyrolysis ◽  
Optimal Conditions ◽  
Adsorption Efficiency ◽  
Practical Application ◽  
Adsorption Experiment ◽  
Phenol Solution ◽  
Adsorption Performance ◽  
Pyrolysis Furnace

The single blending of biomass and S-TiO2 and the mixed modification of coal char were obtained by the method of coking with coal pyrolysis furnace. The adsorption performance of biomass and S-TiO2 was investigated by the adsorption experiment of phenol solution. The results show that under the optimal conditions the best performance of MCC-2 can achieve 94% removal efficiency of phenol. The adsorption efficiency is 20% higher than that reported in the literature, and the adsorption equilibrium time is several times shorter than that reported in the literature. The modified coal char has broad prospects as a substitute for activated carbon in practical application.

Removal of Silver (I) from Aqueous Solutions by Chitosan/Carbon Nanotube Nanocomposite Beads

2014 ◽  
Vol 893 ◽  
pp. 166-169 ◽  
Author(s):  
Walaikorn Nitayaphat ◽  
Thanut Jintakosol
Keyword(s):  
Adsorption Equilibrium ◽  
Ph Value ◽  
Dosage Level ◽  
Maximum Adsorption Capacity ◽  
Optimal Conditions ◽  
Adsorption Efficiency ◽  
Composite Adsorbent ◽  
Adsorbent Dosage ◽  
Composite Beads ◽  
Initial Ph

Chitosan/CNT nanocomposites were prepared by blending chitosan with carbon nanotubes (CNTs) and forming composite beads. The composites were used as Ag+adsorbents. Adsorption equilibrium experiments were carried out as a function of contact time, CNTs concentration, pH value, and adsorbent dosage level. The equilibrium time of Ag+adsorption was found to be 160 min. Composite adsorbent had the highest adsorption efficiency when the weight of CNTs was 0.01 wt%. The maximum Ag+removal took place at the initial pH value of 3. The optimum adsorbent dosage for Ag+removal was 5 g. Under above optimal conditions the maximum Ag+removal was 99.7%. The adsorption isotherm of chitosan/CNT nanocomposite bead agreed well with the Langmuir model. The maximum adsorption capacity was 0.393 mg/g.

scholarly journals Removal of volatile organic compounds by heterogeneous ozonation on microporous synthetic alumina silicate

2012 ◽  
Vol 66 (9) ◽  
pp. 2020-2026 ◽  
Author(s):  
Nicolas Brodu ◽  
Hicham Zaitan ◽  
Marie-Hélène Manero ◽  
Jean-Stéphane Pic
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Treatment Process ◽  
Adsorption Equilibrium ◽  
Fixed Bed ◽  
Adsorption Efficiency ◽  
Hydrophobic Properties ◽  
Adsorption Performance ◽  
Volatile Organic ◽  
Long Time

A hybrid process combining adsorption and ozonation was examined as an alternative treatment for odorous volatile organic compounds (VOCs). Methyl ethyl ketone (MEK) was chosen to study the influence of operating parameters. Two synthetic aluminosilicates (faujasite-Y and ZSM-5) were tested for adsorption and reactivity with ozone. The adsorption equilibrium measurement on both adsorbents showed that adsorption performance depends on temperature but is not sensitive to relative humidity, due to the hydrophobic properties of the materials. Adsorbed VOCs were oxidized at low temperature when ozonated flow was sent to the reactor. Regeneration of the fixed bed was achieved at the same time, releasing mainly CO2 and H2O. Intermediates of oxidation, such as 2,3-butanedione and acetic acid, were identified, leading to incomplete mineralization. The influence of concentration and humidity are discussed. Four successive cycles were tested: after the first adsorption/ozonation cycle, the adsorption efficiency was not affected during subsequent cycles. These results show that the same sample of adsorbent can be used in the treatment process for a long time. Ozonation regeneration is a promising process for VOC removal.

scholarly journals Regeneration Performance of Activated Carbon for Desulfurization

2020 ◽  
Vol 10 (17) ◽  
pp. 6107
Author(s):  
Zhiguo Sun ◽  
Menglu Wang ◽  
Jiaming Fan ◽  
Yue Zhou ◽  
Li Zhang
Keyword(s):  
Activated Carbon ◽  
Material Surface ◽  
Test Results ◽  
Optimal Conditions ◽  
Adsorption Efficiency ◽  
Thermal Regeneration ◽  
So2 Removal ◽  
Sulfur Capacity ◽  
Desulfurization Efficiency ◽  
High Level

This study explored the regenerated performance of activated carbon (AC) as SO2 adsorbent. The optimal conditions of SO2 removal were determined by experiment, and then the adsorption efficiency of AC was studied by a method of thermal regeneration. The characteristics of regenerated AC were analyzed by Brunauer-Emmett-Teller (BET) and Scanning Electron Microscopy (SEM) methods. The test results showed that the most suitable adsorption conditions were using 4 g of activated carbon, 1.65 L/min gas flue rate, and 5% O2. During the ten regenerations, the desulfurization efficiency and sulfur capacity of AC still maintained a high level. The characterization results showed that the increase of material surface area and pore volume were 101 m2 g−1, and 0.13 cm3 g−1, respectively, after the cycles.

Phytic Acid Sepiolite Compound Adsorbent on the Adsorption of Cd2+ Performance Research of Heavy Metals

2014 ◽  
Vol 707 ◽  
pp. 199-201
Author(s):  
Jiao Sheng ◽  
Shu Mei Yan ◽  
Xian Feng ◽  
Gui Hua Zeng
Keyword(s):  
Heavy Metals ◽  
Phytic Acid ◽  
Adsorption Equilibrium ◽  
Equilibrium Time ◽  
Adsorbent Dosage ◽  
Adsorption Performance ◽  
Heavy Metals Adsorption ◽  
Performance Research ◽  
Compound Adsorbent ◽  
Acid Compound

This paper studies the preparation of phytic acid with sepiolite compound phytic acid compound sepiolite adsorbent of heavy metals adsorption performance is good, and the adsorption of the optimum adsorption conditions was studied, the optimum adsorption conditions for adsorbent dosage 30 g/L, temperature 40°C, pH = 3, the adsorption equilibrium time 30 min, Cd6+, concentration is lower than 50 mg/L.

scholarly journals Organosolv delignification of residual plantation willow bark after extractive removal

2020 ◽  
Author(s):  
Matiss Pals ◽  
◽  
Liga Lauberte ◽  
Alexandr Arshanitsa ◽  
Laima Vevere ◽  
...  
Keyword(s):  
Effect Of Temperature ◽  
Insoluble Residue ◽  
Optimal Conditions ◽  
Practical Application ◽  
Residual Biomass ◽  
Main Cell ◽  
Willow Bark ◽  
High Yields ◽  
Wall Components ◽  
Comprehensive Characterization

Plantation willows are commonly grown plants which are widely used for energetic purposes that does not correspond completely to its potential. To fully integrate this resource into biorefinery scheme, it is necessary to study optimal conditions of willow bark processing, aimed for separation of bark components, their comprehensive characterization and profitable practical application. Extraction of secondary metabolites is well known approach for bark processing. But the separation of the main cell wall components including lignin from the residual biomass is less studied. In this work plantation residual willow bark after extractives separation by two different solvents (acetone and ethanolwater) was used as a feedstock for Organosolv delignification. Effect of temperature and catalyst used on the yield and properties of lignin isolated from residual bark by ethanol-water treatment was studied. It was possible to obtain pure lignin with high yields (up to 41%) that has the potential to be used for bio-plastic producing. Insoluble residue after delignification was carbohydrate rich (up to 80%) feedstock allowing its practical use for bioethanol producing.

scholarly journals Adsorption of the Petrochemical Pollutants Released at the Small Vehicle-Service Facilities on the Coal Refinery Sludge/Pyrocarbon Compositions

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Mariya FEDORYAK ◽  
Olena BORUK ◽  
Sergiy BORUK ◽  
Igor WINKLER
Keyword(s):  
Hydrophobic Surface ◽  
Waste Materials ◽  
Small Enterprises ◽  
High Porosity ◽  
Adsorption Efficiency ◽  
Adsorption Activity ◽  
Adsorption Performance ◽  
Coal Sludge ◽  
Wide Range ◽  
Stationary Conditions

It has been proven that the use of coal-like adsorbents with the mosaic and hydrophobic surface structure is efficient in cleaning thewastewater from a wide range of pollutants under the condition of their uncontrolled release from various small enterprises. Thisrange includes such environmentally dangerous agents as petrochemicals and other pollutants formed at car filling, carwash stationsor other similar facilities. Technical pyrocarbon and the coal refinery sludges are readily available waste materials with high porosity,which exhibit some adsorption activity and can be utilized in water/wastewater treatment solutions. Then the adsorbents can be eitherdisposed of at the landfill areas or incinerated as components of some secondary fuels. The highest adsorption performance is achievedfor the sorbent mixture of the refinery sludges and technical pyrocarbon with the ratio of the components 4:1.If the wastewater is flowing through this composition, the degree of petrochemicals removal reaches 75-80% for the mixture sludge/technical pyrocarbon, while the pure pyrocarbon ensures the removal degree of 15-20% only. Though adsorption efficiency under stationary conditions (keeping the adsorbent and the wastewater in contact inside some decontamination pond/vessel for at least 24 h) ishigher, this option is hard-to-realize for a small car service/wash station. As an alternative, comparatively small wastewater cleaningcartridges filled with the 4:1 mixture of coal sludge and technical pyrocarbon can be recommended for preliminary decontaminationof the wastewater formed at such enterprises before their discharge to the local municipal sewerage lines.

scholarly journals Simultaneous Purification and Separation of Syringoside and Oleuropein from Syringa oblata Lindl. Extract Using Macroporous Resin

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Guoliang Li ◽  
Hongxiu Yan ◽  
Xiangping Liu
Keyword(s):  
Optimal Parameters ◽  
Macroporous Resin ◽  
Adsorption Experiment ◽  
Adsorption Performance ◽  
Macroporous Resins ◽  
Initial Extract ◽  
Langmuir Isotherm Model ◽  
Potential Basis ◽  
Adsorption Desorption ◽  
Separation Parameters

This study developed an efficient method to simultaneously separate and purify syringoside and oleuropein from Syringa oblata Lindl. extract using macroporous resins. The adsorption and desorption property of 11 resins were systematically evaluated. Based on the adsorption performance, HPD-100B resin was selected for the separation of syringoside and oleuropein. The HPD-100B resin fitted well to the Langmuir isotherm model (R2 > 0.97), as ascertained by the results of the static adsorption experiment. Kinetic and dynamic adsorption/desorption experiments were conducted using the HPD-100B resin to optimize the separation parameters of syringoside and oleuropein. On the optimal parameters, syringoside and oleuropein were obtained from the 20% and 40% ethanol eluates, respectively. In addition, the adsorption effluent (15–60 BV) contained a large amount of syringoside with less impurities; therefore, this part was also collected for further syringoside separation and enrichment of syringoside. By only one cycle treatment, the syringoside and oleuropein contents in the final products increased by 7.1-fold and 8.2-fold, respectively, compared to the initial extract. The method developed in this study provides a potential basis for the industrial-scale enrichment and separation of syringoside and oleuropein from S. oblata extract.

Adsorption Behavior and Kinetics of Methyl Orange in Water on Activated Carbon

2012 ◽  
Vol 549 ◽  
pp. 318-321 ◽  
Author(s):  
Yong Hong Wu ◽  
Qi Yu ◽  
Hong Da Xu ◽  
Zhi Yong Liu ◽  
Ming Zhu Sun ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Methyl Orange ◽  
Adsorption Equilibrium ◽  
Adsorption Behavior ◽  
Adsorption Efficiency ◽  
Key Factors ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Freundlich Equation ◽  
Kinetics Of

The adsorption behavior of methyl orange aqueous solution was investigated on husk-based activated carbon. The effects of key factors, i.e., degassing pretreatment, adsorption time, temperature, adsorbent dosage and initial concentration, on the adsorption efficiency were measured. The kinetic adsorption curves and adsorption isotherms were fitted with theoretical model. The results show that the removal efficiency of methyl orange could be significantly improved by degassing pretreatment, prolonging the time, lowering temperature or reducing the initial concentration. In the context, adsorption equilibrium will be achieved up 90min. Furthermore, adsorption rate will be enhanced by the increase of the amount of activated carbon. In conclusion, adsorption isotherm and adsorption kinetics can be fitted well with Freundlich equation and pseudo-first Lagergren model, respectively.

A comparative study of the adsorption efficiency of typical adsorption materials for wastewater containing cesium

2020 ◽  
Author(s):  
Can Du ◽  
Jinsheng Wang ◽  
Xin Liu ◽  
Juanting Niu
Keyword(s):  
Activated Carbon ◽  
Adsorption Efficiency ◽  
Practical Application ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Mechanisms ◽  
Radioactive Wastewater ◽  
Alkaline Environments ◽  
Kinetics And Isotherms ◽  
Cs Ions

<p>In this paper, six typical adsorption materials (activated carbon, kaolin, montmorillonite, bentonite, zeolite, and attapulgite) were used to investigate the effects of adsorption time, initial concentration, pH, and temperature on the adsorption of cesium (Cs) contained in wastewater. A combination of kinetics and isotherms was used. The results revealed that, for the same adsorption time, the adsorption efficiencies of the six materials for Cs were as follows: zeolite>attapulgite>bentonite>montmorillonite>activated carbon>kaolin. The adsorption rate of zeolite to Cs ions was almost independent of the initial concentration and temperature. The removal effect of other materials improved in alkaline environments at 30℃. Attapulgite, montmorillonite, activated carbon, and kaolin could be used for the removal of Cs at low initial concentrations. The adsorptive processes utilized by the six adsorption materials were the result of a combination of various adsorption mechanisms. Among the six typical adsorption materials, zeolite, attapulgite, and bentonite had clear removal effects and could be used in practical application in which radioactive wastewater containing Cs needs to be disposed of. Our results suggest that zeolite is the best adsorption material for this purpose.</p>

scholarly journals Sustainable Exploitation of Coffee Silverskin in Water Remediation

2018 ◽  
Vol 10 (10) ◽  
pp. 3547 ◽  
Author(s):  
Angela Malara ◽  
Emilia Paone ◽  
Patrizia Frontera ◽  
Lucio Bonaccorsi ◽  
Giuseppe Panzera ◽  
...  
Keyword(s):  
Adsorption Equilibrium ◽  
Water Remediation ◽  
Isotherm Models ◽  
Adsorption Efficiency ◽  
Spent Coffee Grounds ◽  
Ion Removal ◽  
Coffee Silverskin ◽  
Coffee Grounds ◽  
Adsorption Data ◽  
Potential Toxic Metals

Coffee silverskin (CS), the main solid waste produced from the coffee industry, has efficiently been used as adsorbent material to remove potential toxic metals (PTMs). In order to assess its suitability in water remediation, kinetic adsorption experiments of Cu2+, Zn2+, and Ni2+ ions from wastewater were carried out and the adsorption performance of the waste material was compared with that of another well-known waste from coffee industry, spent coffee grounds (SCG). By using CS as sorbent material, ion removal follows the order Cu2+ > Zn2+ > Ni2+ with the adsorption equilibrium occurring after about 20 min. The adsorption efficiency of Ni2+ ions is the same for both investigated materials, while Cu2+ and Zn2+ ions are removed to a lesser extent by using CS. Equilibrium-adsorption data were analyzed using two different isotherm models (Langmuir and Freundlich), demonstrating that monolayer-type adsorption occurs on both CS and SCG surfaces. The overall results support the use of coffee silverskin as a new inexpensive adsorbent material for PTMs from wastewater.

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