The Efficiency of the Removal of Naphthalene from Aqueous Solutions by Different Adsorbents

Abstract

The paper presents the results of laboratory tests on possibilities to utilize active carbons produced in Poland (AG-5 and DTO) and clinoptilolite for removing naphthalene from a water solution in the adsorption process. The concentration of naphthalene in the model solution was 20 mg/dm3. The effects of pH, dose and adsorption time were determined under static conditions. Adsorption kinetics were consistent with the pseudo-second-order model (PSO). Among the applied models, the best fit was obtained using the Langmuir isotherms. The maximum adsorption capacity for the activated carbons (AG-5 and DTO) equaled 24.57 and 30.28 mg/g, respectively. For clinoptilolite, all the analyzed models of adsorption poorly described the adsorption process. The flow conditions were realized by filtration method. On the basis of the obtained results, the breakthrough curves, so-called isoplanes, were prepared and served in turn to determine the adsorption capacities in flow conditions. The total adsorption capacities determined under dynamic conditions of the AG-5 and DTO activated carbons were 85.63 and 94.54 mg/g, respectively, and only 2.72 mg/g for clinoptilolite. The exit curves (isoplanes) were also utilized to determine the mass penetration zone (the adsorption front height), as well as to calculate the rate of mass-exchange zone advance.

Bioremoval of some heavy metals from aqueous solutions by two different indigenous fungi Aspergillus sp. AHM69 and Penicillium sp. AHM96 isolated from petroleum refining wastewater

“…The analysis of PAHs adsorption capacity of each fungal strain as adsorbent against phenanthrene, acenaphthylene, fluoranthene, acenaphthene, anthracene, pyrene, benz[ a ]anthracene, chrysene and Benzo[ a ]pyrene, individually from aqueous solution was done in batch equilibrium adsorption experiments using UV–VIS spectrophotometry (SHIMADZU UV-1700) as described by Brandão et al. (2010) and Puszkarewicz and Kaleta (2020) . Experiments were performed in flasks contains 500 mg/L hydrocarbon, fungal biomass dosage of 4 mg/L in 100 mL acetonitrile-water solution agitated in a shaker at 120 rpm for 24 h at 30 °C.…”

High-Strength Organic–Inorganic Composites with Superior Thermal Insulation and Acoustic Attenuation

“…The hybrid nature of these PUC composites (0.9–1.2 g/cm 3 ) contributes to their low densities, compared to OPC (1.5 g/cm 3 ). Despite the innately higher density of clinoptilolite (2–2.2 g/cm 3 ), , the low density of the PUC composites can be attributed to their porous structure and the presence of the organic components. The effect of porosity on the density is more pronounced at higher excess TDI contents (and lower clinoptilolite contents) owing to a lower solid loading and increased foaming.…”

Post‐combustion carbon dioxide adsorption of concurrent activated and surface modified palm kernel shell‐derived activated carbon

“…Table 3 summarizes the CO 2 adsorption performance of CAM‐PKSdAC, commercial AC (Norit® row 0.8 supra, DTO and WG12) and their modified AC and the conventional surface modified‐activated PKSdAC at 40 °C and 1 bar. Norit (500 g pellets, Sigma Aldrich, United States) and WG12 were the granular AC synthesized using black coal through steam activation process, while DTO is a type of AC supplied by GRYFSKAND from Hajnówka, Poland 60–63 . When comparing CAM‐PKSdAC CO 2 adsorption performance to the commercial AC and their modified AC, CAM‐PKSdAC exhibited a CO 2 adsorption capacity of 1.91 mmol g −1 , 63% higher than Norit (1.17 mmol g −1 ), 68% higher than DTO (1.14 mmol g −1 ), 58% higher than DTO modified by zinc chloride (ZnCl 2 ) activation (1.21 mmol g −1 ), 38% higher than DTO modified by potassium carbonate (K 2 CO 3 ) activation (1.38 mmol g −1 ), 28% higher than WG12 (1.49 mmol g −1 ), 19% higher than WG12 modified by ZnCl 2 activation (1.60 mmol g −1 ) and 5.52% higher than DTO modified by KOH activation (1.81 mmol g −1 ).…”

“…Norit (500 g pellets, Sigma Aldrich, United States) and WG12 were the granular AC synthesized using black coal through steam activation process, while DTO is a type of AC supplied by GRYFSKAND from Hajnówka, Poland. [60][61][62][63] When comparing CAM-PKSdAC CO 2 adsorption performance to the commercial AC and their modified AC, CAM-PKSdAC exhibited a CO 2 adsorption capacity of 1.91 mmol g −1 , 63% higher than Norit (1.17 mmol g −1 ), 68% higher than DTO (1.14 mmol g −1 ), 58% higher than DTO modified by zinc chloride Post-combustion carbon dioxide adsorption of concurrent (ZnCl 2 ) activation (1.21 mmol g −1 ), 38% higher than DTO modified by potassium carbonate (K 2 CO 3 ) activation (1.38 mmol g −1 ), 28% higher than WG12 (1.49 mmol g −1 ), 19% higher than WG12 modified by ZnCl 2 activation (1.60 mmol g −1 ) and 5.52% higher than DTO modified by KOH activation (1.81 mmol g −1 ). Compared to Norit AC, DTO AC and WG12 AC without Ba modification, although it has a smaller surface area (∼422 m 2 g −1 ) compared to Norit (1,150 m 2 g −1 ), DTO (1,187 m 2 g −1 ), ZnCl 2 -modified DTO (1,353 m 2 g −1 ), K 2 CO 3 -modified DTO (1,224 m 2 g −1 ), WG12 (1,186 m 2 g −1 ), ZnCl 2 -modified WG12 (1,374 m 2 g −1 ) and KOH-modified DTO (2,063 m 2 g −1 ), 60,64,65 Ba doping via the reduction of BaSO 4 to BaS during CAM assists to increase CO 2 adsorption capacity of CAM-PKSdAC.…”