scholarly journals Adsorption of polycyclic aromatic hydrocarbons from wastewater by using silica-based organic–inorganic nanohybrid material

2014 ◽  
Vol 5 (1) ◽  
pp. 50-63 ◽  
Author(s):  
Ali Balati ◽  
Afsaneh Shahbazi ◽  
Mostafa M. Amini ◽  
Seyed Hossein Hashemi
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Adsorption Capacity ◽  
Aromatic Hydrocarbons ◽  
Maximum Adsorption Capacity ◽  
Transmission Electron ◽  
Petroleum Refinery Wastewater ◽  
Polycyclic Aromatic ◽  
The Media ◽  
Wastewater Samples ◽  
Nanohybrid Material

Polycyclic aromatic hydrocarbons (PAHs) are a group of priority pollutants, which are classified as persistent hazardous contaminants. Herein, the adsorption of three PAHs, naphthalene (NAP), acenaphthylene (ACN), and phenanthrene (PHN), from wastewater onto NH2-SBA-15 organic–inorganic nanohybrid material as a function of pH of the media (2–10), sorbent dosage (0.5–3.5 g L−1), PAH concentration (1–18 mg g−1), and temperature (25–45 °C) were elucidated. The prepared adsorbents were characterized by scanning electron microscope, transmission electron microscopy, X-ray diffractions, and thermogravimetric analysis. Among Langmuir, Freundlich, and Temkin isotherms models, it was found that the Langmuir model gave an excellent overall fit (R2 > 0.97). The maximum adsorption capacity of 1.92, 1.41, and 0.76 mg g−1 was obtained for NAP, ACN, and PHN, respectively. Adsorption kinetics of PAHs onto NH2-SBA-15 was in accordance with the pseudo-second-order model, providing evidence that pore mass transferring was involved. PAHs' adsorption was strongly dependent on temperature, and confirmed the spontaneous and endothermic nature of the process. The optimized sorption condition was successfully applied to the real petroleum refinery wastewater samples and the adsorption capacity of NH2-SBA-15 was satisfactory for PAHs' studies as 1.67, 1.06, and 0.24 mg g−1 for NAP, ACN and PHN, respectively. Furthermore, reusability was successfully tested by five sequential recoveries.

scholarly journals Optimization of the sorption of selected polycyclic aromatic hydrocarbons by regenerable graphene wool

2019 ◽  
Vol 80 (10) ◽  
pp. 1931-1943 ◽  
Author(s):  
Adedapo O. Adeola ◽  
Patricia B. C. Forbes
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Adsorption Capacity ◽  
Aromatic Hydrocarbons ◽  
Kinetic Data ◽  
Second Order ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Polycyclic Aromatic ◽  
Pseudo Second Order ◽  
Best Fit

Abstract A novel graphene wool (GW) material was used as adsorbent for the removal of phenanthrene (PHEN) and pyrene (PYR) from aqueous solution. Adsorption kinetics, adsorption isotherms, thermodynamics of adsorption and effect of pH, ionic strength, and temperature on the adsorption of PHEN and PYR onto GW were comprehensively investigated. Isothermal and kinetic experimental data were fitted to Langmuir, Freundlich, Temkin, Sips and Dubinin–Radushkevich models, as well as pseudo-first-order and pseudo-second-order kinetic models. The adsorption kinetic data best fit the pseudo-second-order kinetic model for PHEN and PYR sorption with R2 value >0.999, whilst the Sips model best fit isotherm data. Kinetic data revealed that 24 hr of contact between adsorbent and polycyclic aromatic hydrocarbons (PAHs) was sufficient for maximum adsorption, where the Langmuir maximum adsorption capacity of GW for PHEN and PYR was 5 and 20 mg g−1 and the optimum removal efficiency was 99.9% and 99.1%, respectively. Thermodynamic experiments revealed that adsorption processes were endothermic and spontaneous. Desorption experiments indicated that irreversible sorption occurred with a hysteresis index greater that zero for both PAHs. The high adsorption capacity and potential reusability of GW makes it a very attractive material for removal of hydrophobic organic micro-pollutants from water.

Degradation of polycyclic aromatic hydrocarbons (PAHs) by a mixed culture and its component pure cultures, obtained from PAH-contaminated soil

1995 ◽  
Vol 41 (6) ◽  
pp. 470-476 ◽  
Author(s):  
D. Trzesicka-Mlynarz ◽  
O. P. Ward
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Mixed Culture ◽  
Aromatic Hydrocarbons ◽  
Aqueous Media ◽  
Water Soluble ◽  
Nitrogen Levels ◽  
Glucose Levels ◽  
Polycyclic Aromatic ◽  
Pure Cultures ◽  
The Media

A mixed culture, isolated from soil contaminated with polycyclic aromatic hydrocarbons (PAHs), grew on and degraded fluoranthene in aqueous media supplemented with glucose, yeast extract, and peptone. Increased complex nitrogen levels in the medium promoted bacterial growth and a greater extent of fluoranthene degradation. Amendment of the media with high glucose levels also diminished specific fluoranthene degradation. The mixed culture was capable of degrading a range of other PAHs, including benzo[a]pyrene, anthracene, phenanthrene, acenaphthene, and fluorene. The mixed culture contained four predominant isolates, all of which were Gram-negative rods, three of which were identified as Pseudomonas putida, Flavobacterium sp., and Pseudomonas aeruginosa. Better degradation of a defined PAH mixture was observed with the mixed culture than with individual isolates. A reconstituted culture, prepared by combining the four individual isolates, manifested a similar PAH biodegradation performance to the original mixed culture. When compared with the mixed culture, individual isolates exhibited a relatively good capacity to remove more water-soluble PAHs (acenaphthene, fluorene, phenanthrene, fluoranthene). In contrast, removal of less water-soluble PAHs (anthracene and pyrene) was low or negligible with isolated cultures compared with the mixed culture.Key words: polycyclic aromatic hydrocarbons, mixed culture, fluoranthene, Pseudomonas, Flavobacterium.

scholarly journals Adsorption of Polycyclic Aromatic Hydrocarbons by Natural, Synthetic and Modified Clays

Environments ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 124
Author(s):  
Sara Satouh ◽  
Julia Martín ◽  
María del Mar Orta ◽  
Santiago Medina-Carrasco ◽  
Nabil Messikh ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Adsorption Capacity ◽  
Aromatic Hydrocarbons ◽  
Low Cost ◽  
X Ray Diffraction ◽  
X Ray ◽  
Toxicological Effects ◽  
Polycyclic Aromatic ◽  
Interesting Alternative ◽  
Environmental Compartments

Polycyclic aromatic hydrocarbons (PAHs) are of major scientific concern owing to their widespread presence in environmental compartments and their potential toxicological effects on humans and biota. In this study, the adsorption capacity of natural (montmorillonite (Mt)), synthetic (Na-Mica-4), and modified (with octadecylamine and octadecyltrimethylamine (ODA-Mt, ODA-Mica-4, and ODTMA-Mt and ODTMA-Mica-4)) clays were assessed and compared for the removal of 16 PAHs. Materials were synthesized and characterized by X-Ray diffraction, Zeta potential, and Fourier-transform infrared spectroscopy. The results showed its correct preparation and the incorporation of PAHs in the structure of the clays after the adsorption tests. The proposed materials were effective PAH adsorbents, with adsorption percentages close to 100%, in particular those using Mt. Mt and Na-Mica-4 presented a better adsorption capacity than their organofunctionalized derivatives, indicating that the adsorption of PAHs may occur both in the surface part and in the interlayer. The proposed adsorbents take the advantage of being a low cost and highly effective. They can be an interesting alternative for wastewater treatment and soil remediation to prevent PAH contamination.

scholarly journals Investigation of using bleaching earth and activated carbon mixturein sunfloweroilrefining

2017 ◽  
Vol 13 (1) ◽  
pp. 5932-5936
Author(s):  
Guliyev Nihad Gudret ◽  
Ibrahimov Hikmet Jamal ◽  
Alekperov Jamil Arif ◽  
Amirov Fariz Ali ◽  
Ibrahimova Zenfira Meherrem
Keyword(s):  
Heavy Metals ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Aromatic Hydrocarbons ◽  
Sunflower Oil ◽  
Bleaching Earth ◽  
Bleaching Agent ◽  
Bleaching Process ◽  
Polycyclic Aromatic

Adsorption is one commonly used technique for treatment of sunflower oil. In this study, activated carbon and bleaching earth as a bleaching agent mixed with certain proportions and1% of the mixture added to sunflower oil in the bleaching process. The combination of bleaching earth and activated carbon produced higher adsorption capacity than the single bleaching earth. This article focuses more particularly on heavy metals and polycyclic aromatic hydrocarbons (PAHs) removal. It was detected that, the mixture is an excellent adsorbent in the adsorption of PAHs and metals from sunflower oil with the highest adsorption capacity. The results showed that, the adsorption of metals and PAHs depend strongly on activated carbon and decreased with increasing activated carbonin mixture and the maximum adsorption was reached after using B5 (95 % bleaching earth and 5 % activated carbon combination).

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