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Showing 4 results for Carbon Nanotube
Assessment of Phthalate Esters in A Variety of Carbonated Beverages Bottled in PET
Mojtaba Moazzen, Noushin Rastkari, Mahmood Alimohammadi, Nabi Shariatifar, Reza Ahmadkhaniha, Shahrokh Nazmara, Arash Akbarzadeh, Ali Azari, Ramin Nabizadeh, Gholamreza Jahed Khaniki,
Volume 2, Issue 1 (12-2014)
Abstract

Background: Phthalate esters are polymeric compounds usually used as a plasticizer. These materials can enter to the human body through various ways the main way could be food packaging. Chronic contact with these materials could result cancer, including breast cancer in women and prostate cancer in men as well as other endocrine problems. The objective of this study was to assess the concentration of phthalate esters in carbonated beverages. Methods: In this study, a magnetic nano-scale adsorbent, made from carbon nanotubes and Fe3O4. Deposition of Fe3O4 on the adsorbent could result in improvement of adsorption and desorption as well as extraction procedure. Then, by means of adsorbent and solvent extraction, phthalate esters were extracted from the beverage matrices and determined using GC-MS analysis. Results: amongst studied ingredients, BEP or DEHP, that have been found to be carcinogenic, had highest concentration in beverages, and also the brand of A and taste of C had the highest average concentration. Except one sample, the total amounts of these ingredients were below than international standards. Conclusion: Based on the results, consumers can use these beverages without any concern regarding phthalate esters amounts. The results also demonstrated that this synthesized adsorbent has good performance for extraction of phthalates from studied matrices.


Evaluation of Diazinon Adsorption from Water Solutions Using Magnetic Carbon Nano-Tubes with Fe3O4
Anoushiravan Mohseni-Bandpei, Masoud Fattahzadeh, Roshanak Rezaei Kalantary, Akbar Eslami,
Volume 2, Issue 4 (6-2015)
Abstract

Background and objective: Insecticides are one of the most important pollutants in water. Diazinon is one of the phosphorus pesticides that can be found in aquatic ecosystems in Iran. The toxic effect of diazinon is inhibition of the enzyme acetyl cholinesterase (Ache). In this study, MWCNT/ Fe3O4 efficiency was investigated.

Materials and Methods: In this study, co-precipitation method was used for the Fe3O4 synthesis on multiwall carbon nanotube. The pH, contact time, adsorbent dose, pollutant concentrations and temperature parameters were investigated. Diazinon was measured by Gas chromatography method.

Results: The results showed that the optimum conditions for diazinon removal were pH 6, contact time of 15 minutes, and  adsorption dose of 0.6 g/l. So, the absorption efficiency increases with increasing of temperature and decresing of pollutant concentration. The diazinon adsorption corresponded with Freundlich isotherm (R2> 0.99) more than Langmuir isotherm model (R2> 0.90).

Conclusion: The results show that the magnetic carbon nanotubes with Fe3O4 can be suitable adsorbent for diazinon removal from aquatic environment. 


Performance Evaluation of Magnetic-Multiwalled Carbon Nanotube in Removal of 2,4-DNP from Aqueous Solutions and Determining Toxicity Reduction
Golnar Nourisepehr, Mozhgan Emtiazjoo, Mohammad Nourisepehr, Emad Dehghanifard,
Volume 3, Issue 4 (9-2016)
Abstract

Background and Objective: In Iran, due to vast development of different chemical and petrochemical industries and water resource pollution to refractory organic matters, using a costeffective method for the removal of those pollutant from drinking water. The aim of this study was to evaluate the performance of magnetic-multiwalled carbon nanotube for the removal of 2,4-
dinitrophenol from aquoeous solutions and deteremining toxicity reduction of the effluent.
Methods: Adsorption experiments were conducted in a batch system. Magnetic-multiwalled carbon nanotubes were synthesized by co-precipitation method. Variables of contact time (0-90 min), pH (3,5, 7, 9, 11), pollutant concentration (10-100 mg/L) and adsorbent concentration (1-2.5 g/L) were considered. For the determination of toxicity reduction of the effluent, the Bioassay tests were applied by using Daphnia magna which toxicity of 48h and 96 h were obtained.
Results: Results were showed that the maximum removal of 92.97% in the contact time of 90 min were obtained in pH=7, pollutant concentration of 10 mg/L and adsorption concentration of 2.5 g/L. The adsorption process was in accordance with Freundlich isotherm which showed non-uniform and multi-layered adsorption on the surface of the adsorbent and heterogeneous adsorption. The results of the toxicity of 2,4-DNP, before the adsorption process, on the Daphnia magna organism showed that the lethal concentration (LC50) 48h and 96 h of the raw wastewater was 42 and 38 percent (4.2 and
3.8 mg/L), respectively.
Conclusions: The magnetic-multiwalled carbon nanotube adsorbent could be a proper choice for removal of 2,4-DNP, due to high removal efficiency, recyclability, reusability and activity in neutral pH.


Investigation the efficiency of magnetized carbon nanotubes in the removal of aniline from aqueous solutions
Babak Kakavandi, Mohammad Noorisepehr, Emad Dehghanifard, Mohammad Rafiee,
Volume 7, Issue 3 (5-2020)
Abstract
Background &Objectives: Aniline is a substance used in chemical industries and in various processes such as pesticide production, chemical bleaching, textile dyes, etc. In spite of the negative effects of aniline on the environment due the difficult decomposition of this substance, various methods have been investigated to remove this substance from water resources. The aim of this study was to investigate the efficiency of magnetized carbon nanotubes in the removal of aniline from aqueous solutions.
Methods: Fe3O4-CNT magnetic nanoparticles were prepared by co-precipitation method. The morphology of the adsorbent surface, shape and size of CNT-Fe3O4 magnetic nanoparticles was investigated by scanning electron microscopy (SEM) and transfer electron microscopy (TEM). BET analysis was also used to determine the physical properties of the adsorbent such as surface area, size and volume of the cavities and their distribution on the adsorbent. An X-ray diffraction device (XRD) was used to determine the pattern and the purity of the Fe3O4 particles. The synthetic adsorbent properties were analyzed by FTIR technique. In order to optimize the adsorption conditions and determine the optimal values of each of the factors affecting the adsorption process (pH, contact time, adsorbent value, initial aniline error and temperature), adsorption experiments were performed and aniline concentration was determined by spectrophotometric method.
Results: SEM and TEM analyzes showed that the magnetic carbon nanotubes were almost uniform and had an average diameter of 5 nanometers and an average length of 100 nanometers. XRD analysis also showed the stabilization of Fe3O4 on carbon nanotubes. FTIR analysis for the absorption of aniline contaminants on the magnetic carbon nanotubes adsorbent indicated that the aniline contaminant bond has appeared on the adsorbent.
Conclusion: The results of the study showed that magnetic MWCNT adsorbent was able to effectively remove aniline contaminants from aquatic environments. Statistical analysis showed that pH parameters, adsorption concentration, pollutant concentration, temperature and contact time were effective on pollutant removal efficiency.

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