COMPARISON OF BIOMASSES AS ADSORBENT MATERIALS FOR PHENOL REMOVAL

2021 ◽  
Author(s):  
PUSHPA JHA
Keyword(s):  
Phenol Removal ◽  
Adsorbent Materials

Study of The Influence of Different Variables on Clathrate Practical Applications in Phenol Removal

2020 ◽  
Vol 38 (9A) ◽  
pp. 1373-1383
Author(s):  
Riyadh S. AL- Mukhtar ◽  
Shurooq T. Remedhan ◽  
Marwa N. Hussin
Keyword(s):  
Crystal Structures ◽  
High Capacity ◽  
Volume Ratio ◽  
Constant Speed ◽  
Water Volume ◽  
Phenol Removal ◽  
Process Performance ◽  
Economic Costs ◽  
Practical Applications ◽  
Glass Cell

In this work, effluent wastewater treated by using cyclopentane-water Clathrate system to treat water contaminates with phenols at concentrations (300, 250, 200, 150, 100 and 50) ppm in order to investigate the capability of process performance. Clathrate or hydrate are strong crystal structures including water (host particles) and little particles (guest particles). The experiments were conducted at different cyclopentane-water volume ratios (1: 2 and 1: 4). The work was done in a 250 ml glass cell with an electric mixer at a constant speed of 280 cycles per minute. Phenol was highest removal percent at 300ppm at 1: 4volume ratio was (92.3%), while the lowest concentration at 50 ppm and 1: 2volume ratio was (55%). Yield and Enrich factor had the highest values at the lowest concentration 50ppm and 1:2 volume ratio were (85% and 2.42) respectively. The technique of the Clathrate proved that it has a high capacity in the separation and achieve high removal percentage compared to other methods at standard conditions when the pressure of 1 atmosphere and temperature higher than the degree of freezing water and less economic costs compared to other methods.

Shear Loss Characteristics of an Aerobic Biofilm

1992 ◽  
Vol 26 (3-4) ◽  
pp. 595-600 ◽  
Author(s):  
S. M. Rao Bhamidimarri ◽  
T. T. See
Keyword(s):  
Growth Rate ◽  
Shear Stress ◽  
Film Thickness ◽  
Removal Rate ◽  
Surface Growth ◽  
Phenol Removal ◽  
Concentric Cylinder ◽  
Substrate Utilisation ◽  
Utilisation Rate ◽  
Net Growth Rate

Growth and shear loss characteristics of phenol utilizing biofilm were studied in a concentric cylinder bioreactor. The net accumulation of the biofilm and the substrate utilisation were measured as a function of torque. Uniform biofilms were obtained up to a thickness of around 300 microns, beyond which the surface growth was non-uniform. The substrate utilisation rate, however, reached a constant value beyond film thickness of 50 to 100 microns depending on the operational torque. The maximum phenol removal rate was achieved at a shear stress of 3.5 Nm-2. The effect of shear stress on net growth rate was found to be described byand a zero net growth was obtained at a shear stress of 18.7 Nm-2.

Accelerated Phenol Removal by Amplifying the Metabolic Pathway with a Recombinant Plasmid Encoding Catechol 2, 3 Oxygenase

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2191-2194 ◽  
Author(s):  
M. Fujita ◽  
M. Ike ◽  
T. Kamiya
Keyword(s):  
Metabolic Pathway ◽  
Recombinant Plasmid ◽  
Removal Rate ◽  
Phenol Degradation ◽  
Wild Strain ◽  
Phenol Concentration ◽  
Phenol Removal

The metabolic pathway of the phenol degradation in Pseudomonasputida BH was amplified by introducing the recombinant plasmid containing catechol 2,3 oxygenase gene isolated fron the chromosome of BH. This strain could degrade phenol and grow much faster than the wild strain at the phenol concentration of 100mg/L. This strain seems to accelerate the phenol removal rate if it is applied to the treatment of wastewater containing phenol.

Continued exploration of trifunctional alkyl 4-chloro-2-diazo-3-oxobutanoates: streamlined entry into [1,2,3]triazolo[5,1-c][1,4]benzoxazines and [1,2,3]triazolo[5,1-c][1,4]benzoxazepines

Synthesis ◽  
2021 ◽  
Author(s):  
Anton V. Budeev ◽  
Grigory Kantin ◽  
Dmitrii Viktorovich Dar'in ◽  
Mikhail Krasavin
Keyword(s):  
Medicinal Chemistry ◽  
Phenol Removal ◽  
Protecting Group

Further exploration of the trifunctional character of previously introduced alkyl 4-chloro-2-diazo-3-oxobutanoates in reactions with N-protected substituted o-aminophenols followed by deprotection provided a convenient entry into [1,2,3]triazolo[5,1-c][1,4]benzoxazines which are of high medicinal importance as documented in the literature. The same approach applied to N-protected substituted o-(aminomethyl)phenols afforded [1,2,3]triazolo[5,1-c][1,4]benzoxazepines which are practically unexplored from medicinal chemistry perspective. The syntheses start with SN2-type alkylation of the phenol. Removal of the protecting group triggered an imine formation followed by the Wolff 1,2,3-triazole synthesis.

scholarly journals Graphene-Based Materials Immobilized within Chitosan: Applications as Adsorbents for the Removal of Aquatic Pollutants

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3655
Author(s):  
Daniele C. da Silva Alves ◽  
Bronach Healy ◽  
Tian Yu ◽  
Carmel B. Breslin
Keyword(s):  
Mechanical Properties ◽  
Heavy Metal Ions ◽  
Chelating Agents ◽  
Organic Molecules ◽  
Adsorption Process ◽  
Chitosan Hydrogel ◽  
Polymeric Blends ◽  
Aquatic Pollutants ◽  
Immobilization Matrix ◽  
Adsorbent Materials

Graphene and its derivatives, especially graphene oxide (GO), are attracting considerable interest in the fabrication of new adsorbents that have the potential to remove various pollutants that have escaped into the aquatic environment. Herein, the development of GO/chitosan (GO/CS) composites as adsorbent materials is described and reviewed. This combination is interesting as the addition of graphene to chitosan enhances its mechanical properties, while the chitosan hydrogel serves as an immobilization matrix for graphene. Following a brief description of both graphene and chitosan as independent adsorbent materials, the emerging GO/CS composites are introduced. The additional materials that have been added to the GO/CS composites, including magnetic iron oxides, chelating agents, cyclodextrins, additional adsorbents and polymeric blends, are then described and discussed. The performance of these materials in the removal of heavy metal ions, dyes and other organic molecules are discussed followed by the introduction of strategies employed in the regeneration of the GO/CS adsorbents. It is clear that, while some challenges exist, including cost, regeneration and selectivity in the adsorption process, the GO/CS composites are emerging as promising adsorbent materials.

Phenol removal via activated carbon from co-pyrolysis of waste coal tar pitch and vinasse

2021 ◽  
Vol 38 (1) ◽  
pp. 64-71
Author(s):  
Ming Gao ◽  
Xiaona Wang ◽  
Changlei Xia ◽  
Na Song ◽  
Yuhui Ma ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Coal Tar ◽  
Coal Tar Pitch ◽  
Phenol Removal ◽  
Waste Coal

scholarly journals Conversion of industrial carpet waste into adsorbent materials for organic dye removal from water

2021 ◽  
pp. 100150
Author(s):  
Kasidit Janbooranapinij ◽  
Arinchai Yimponpipatpol ◽  
Narueporn Ngamthanacom ◽  
Gasidit Panomsuwan
Keyword(s):  
Dye Removal ◽  
Organic Dye ◽  
Carpet Waste ◽  
Adsorbent Materials

scholarly journals Investigating the performance of agricultural wastes and their ashes in removing phenol from leachate in a fixed-bed column

2020 ◽  
Vol 81 (10) ◽  
pp. 2109-2126 ◽  
Author(s):  
Seyed Omid Ahmadinejad ◽  
Seyed Taghi Omid Naeeni ◽  
Zahra Akbari ◽  
Sara Nazif
Keyword(s):  
Activated Carbon ◽  
Large Scale ◽  
Fixed Bed ◽  
Walnut Shell ◽  
Continuous Systems ◽  
Phenol Removal ◽  
Adsorption Method ◽  
Fixed Bed Column ◽  
Saturation Time ◽  
Coconut Shell Activated Carbon

Abstract One of the major pollutants in leachate is phenol. Due to safety and environmental problems, removal of phenol from leachate is essential. Most of the adsorption studies have been conducted in batch systems. Practically, large-scale adsorption is carried out in continuous systems. In this research, the adsorption method has been used for phenol removal from leachate by using walnut shell activated carbon (WSA) and coconut shell activated carbon (CSA) as adsorbents in a fixed-bed column. The effect of adsorbent bed depth, influent phenol concentration and type of adsorbent on adsorption was explored. By increasing the depth of the adsorbent bed in the column, phenol removal efficiency and saturation time increase significantly. Also, by increasing the influent concentration, saturation time of the column decreases. To predict the column performance and describe the breakthrough curve, three kinetic models of Yon-Nelson, Adams-Bohart and Thomas were applied. The results of the experiments indicate that there is a good match between the results of the experiment and the predicted results of the models.

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