نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه آموزش بهداشت، دانشکده بهداشت، دانشگاه علوم پزشکی و خدمات بهداشتی شهید صدوقی، یزد، ایران

2 گروه مهندسی بهداشت محیط، پردیس بین المللی دانشگاه علوم پزشکی و خدمات بهداشتی شهید صدوقی، یزد، ایران

3 گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی کردستان، سنندج، ایران

چکیده

چکیده وجود مقادیر خیلی کم فسفر در فاضلاب‌های شهری و صنعتی تصفیه‌شده باعث ایجاد شکوفایی جلبکی می‌گردد، ازاین‌رو حذف آن برای جلوگیری از بروز پدیده شکوفایی جلبکی در منابع آبی ضروری است. لذا هدف از این مطالعه، بررسی مقدار جذب فسفر از محیط‌های آبی با استفاده از نانولوله‌های کربنه تک جداره به‌عنوان جاذب است. این مطالعه به‌صورت تجربی در مقیاس آزمایشگاهی در یک سیستم بسته انجام پذیرفت. تعیین ویژگی جاذب سنتز شده با استفاده از میکروسکوپ الکترونی رویشی انجام شد. تأثیر متغیرهای مؤثر برجذب فسفر مثل مقدار جاذب، غلظت اولیه فسفر و pH بررسی شد. هم‌چنین برای ارزیابی داده‌ها از مدل‌های ایزوترمی و سنتیکی استفاده شد. نتایج نشان داد که با افزایش دوز جاذب کارآیی حذف افزایش می‌یابد. به صورتی که با افزایش دوز جاذب از 1/0 به 4/0 کارآیی حذف از 83/0 به 925/0 افزایش یافت هم‌چنین برای بررسی سینتیک جذب سطحی داده‌ها، از دو مدل سینتیکی شبه مرتبه اول، شبه مرتبه دوم و مدل نفوذ درون‌ذره‌ای استفاده شد. نتایج تجربی به‌دست‌آمده با مدل سینتیکی شبه مرتبه دوم تطابق خوبی نشان دادند. ایزوترم‌ حالت تعادل با مدل‌های ایزوترم جذب لانگمویر، فرندلیش و تمکین مطابقت داده شد. نتایج نشان داد که داده‌های به‌دست‌آمده با مدل ایزوترم جذب در حال تعادل لانگمیور مطابقت خوبی دارد. با توجه به نتایج به‌دست‌آمده نتیجه‌گیری می‌شود که نانولوله‌های کربنی تک دیواره شده کارآیی بالایی در جذب فسفر دارند و می‌توانند به‌عنوان یک جاذب مؤثر جهت جذب فسفر مورد استفاده قرار گیرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Isotherm and Kinetic Study of Phosphor Adsorption from Aqueous Solution using Single Wall Carbon Nanotubes

نویسندگان [English]

  • Afshin Bahmani 1
  • Seyedeh Parvin Moussavi 2
  • Kamal Salehi 3

1 Department of Health Education, Faculty of Health, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran

2 Department of Environmental Health Engineering, International Campus of Shahid Sadoughi University of Medical Sciences, Yazd, Iran

3 Department of Environmental Health Engineering, Faculty of Health, Kurdistan University of Medical Sciences, Sanandaj, Iran

چکیده [English]

The presence of trace amounts of phosphorus in treated wastewaters from municipalities and industries results in eutrophication.Therefore, its removal is crucial for controlling eutrophication in receiving water. Hence, the aim of this study was to evaluate the phosphor adsorption from aqueous solution using single wall carbon nanotubes (SWCNT) as a sorbent. The batch experiments were performed at laboratory scale. The SWCNT was characterized using scanning electron microscope (SEM). The effects of operational parameters such as adsorbent dosage, pH, and initial phosphor concentration on initial phosphor removal were evaluated. The isotherm and kinetics of phosphor adsorption were determined. The results showed that phosphor removal was directly proportional with increase in adsorbent dosage and it was reversely proportional with increase in initial phosphorous concentration. Therefore, with adsorbent dosage increased from 0.1 to 0.4 mg/l, the percentage of removal increased from 83.0 to 92.5%. Moreover, the pseudo-first order, pseudo-second order kinetic, and intraparticle diffusion models were used to describe the kinetic data. The experimental data fitted well with pseudo-second order kinetic model. Equilibrium isotherms were analyzed by Langmuir, Freundlich, and Tempkin adsorption models. It was found that the adsorption isotherm was correlated reasonably well with Freundlich isotherm. The high adsorption capacity of SWCNT indicates that this adsorbent might be a suitable alternative to remove pollutants from aqueous media. It is concluded that the SWCNTs have a high potential for phosphor adsorption and can be used as an effective adsorption for removal of phosphor form effluents.

کلیدواژه‌ها [English]

  • Single Wall Carbon Nanotubes
  • Phosphor
  • Kinetic
  • Isotherm
  • ََAdsorbent
Almeelbi T. and Bezbaruah A. (2010). Aqueous phosphate removal using nanoscale zero-valent iron. J. Nanoparticle Res.,14-1 (7), 14-2.
 
Albertsen M., Hansen L.B .S., Saunders A M., Nielsen P.H. and Nielsen K.L. (2012). A metagenome of a full-scale microbial community carrying out enhanced biological phosphorus removal. The ISME J., 6(6),1094-106.
 
Alver E. and Metin A.Ü. (2012) Anionic dye removal from aqueous solutions using modified zeolite: adsorption kinetics and isotherm studies. Chem. Eng. J., 200(20),59-67.
 
De Sousa A. F., Braga T. P., Gomes E. C. C., Valentini A. and Longhinotti E. (2012). Adsorption of phosphate using mesoporous spheres containing iron and aluminum oxide. Chem. Eng. J., 210(5), 143-9.
 
Gupta V. K., Kumar R., Nayak A., Saleh T. A. and Barakat M. (2013). Adsorptive removal of dyes from aqueous solution onto carbon nanotubes: a review. Adv. Colloid Interface Sci., 193(6), 24-34.
 
Gong J. L., Wang B., Zeng G. M., Yang C. P., Niu C. G. and Niu Q. Y. (2009). Removal of cationic dyes from aqueous solution using magnetic multi-wall carbon nanotube nanocomposite as adsorbent. J. Hazard. Mater., 164(2), 122-517.
 
Ghasemi M., Naushad M., Ghasemi N. and Khosravi-Fard Y. (2014). Adsorption of Pb (II) from aqueous solution using new adsorbents prepared from agricultural waste: Adsorption isotherm and kinetic studies. J. Indust. Eng. Chem., 20(4), 2193-2199.
 
Genz A., Kornmüller A. and Jekel M. (2004). Advanced phosphorus removal from membrane filtrates by adsorption on activated aluminium oxide and granulated ferric hydroxide. Wat. Res., 38(16), 3523-3530.
 
Konicki W., Pełech I., Mijowska E. and Jasińska I. (2014). Adsorption Kinetics of Acid Dye Acid Red 88 onto Magnetic Multi‐WalledCarbon Nanotubes‐Fe3C Nanocomposite. Clean Soil, Air, Water. 42(3), 284-294.
 
Lin S. H. and Juang R. S. (2002). Heavy metal removal from water by sorption using surfactant-modified montmorillonite. J. Hazard. Mater., 92(3), 315-326.
 
Lixia W., Zhihui L., Juan W. and Shu Z. (2015). Removal phosphorus in pollution water by composite aluminum electrode. AASRI International Conference on Industrial Electronics and Applications (IEA 2015).
 
Liu C. J., Liy Z., Luan Z. K., Chen Z. Y., Zhang Z. G. and Jia Z. P. (2007). Adsorption removal of phosphate from aqueous solution by active red mud. J. Environ. Sci., 19(10), 1166-1170.
 
Mohamed E., Selim A., Seliem M. and Abukhadra M. R. (2015) Modeling and optimizations of phosphate removal from aqueous solutions using synthetic zeoliteNa-A. J. Mater. Sci. Chem. Eng., 3(09),15.
 
Mohammed S. A., Shanshool H. A. (2009). Phosphorus removal from water and waste water by chemical precipitation using alum and calcium chloride. Iraqi J. Chem. Petrol. Eng., 10(2), 35-42.
 
Mittal A., Jhare D. and Mittal J. (2013). Adsorption of hazardous dye eosin yellow from aqueous solution onto waste material de-oiled soya: isotherm, kinetics and bulk removal. J. Molecul. Liquids, 179(2), 133-40.
 
Madrakian T., Afkhami A. and Ahmadi M. (2012). Adsorption and kinetic studies of seven different organic dyes onto magnetite nanoparticles loaded tea waste and removal of them from wastewater samples. Spectrochimica Acta Part A :Molecular and Biomolecular Spectroscopy, 99(3), 9-102.
 
Ngah W. W., Fatinathan S. and Yosop N. (2011). Isotherm and kinetic studies on the adsorption of humic acid onto chitosan-H2SO4 beads. Desal., 272(1), 293-300.
 
Oliveira M., Machado A. and Nogueira R.(2012). Phosphorus removal from eutrophic waters with an aluminium hybrid nanocomposite. Water, Air, & Soil Pollut., 223(8), 4831-4840.
 
Rahchamani J., Mousavi H. Z. and Behzad M. (2011). Adsorption ofmethyl violet from aqueous solution by polyacrylamide as an adsorbent: Isotherm and kinetic studies. Desal. Wat. Treat., 267(2), 256-260.
 
Samarghandi M. R., Rahmani A. R., Nourisepehr M., Zarrabi M. and Borji S. (2013). Determination of thermodynamic and kinetic parameters during sorption of phosphorous by weakly anion exchanger. J. Wat. Wastewat., 24(3), 2-11 [In Persian].
 
Tang H., Zhou W. and Zhang L. (2012). Adsorption isotherms and kinetics studies of malachite green on chitin hydrogels. J. Hazard. Mater., 209(3), 218-225.
 
Tang Y., Hu T., Zeng Y., Zhou Q. and Peng Y. (2015). Effective adsorption of cationic dyes by lignin sulfonate polymer based on simple emulsion polymerization: isotherm and kinetic studies. RSC Adv., 5(5), 3757-66.
 
Tang Y. K., Tong Z. F., Wei G. T., Li Z. M. and Liang D. W. (2006). Removal of phosphate from aqueous solution with modified bentonite. Water, Air, & Soil Pollut., 6(2), 350-365.
 
Vučurović V. M., Razmovski R. N. and Tekić M. N. (2012). Methylene blue (cationic dye) adsorption onto sugar beet pulp: equilibrium isotherm and kinetic studies. J. Taiwan Instit. Chem. Eng., 43(1), 108-11.
 
Zheng X., Wu R. and Chen Y. (2011). Effects of ZnO nanoparticles on wastewater biological nitrogen and phosphorus removal. Environ. Sci. Technol., 45(7), 2826-2832.
 
Zhou Q., Wang X., Liu J. and Zhang L. (2012). Phosphorusremoval from wastewater using nano-particulates of hydrated ferric oxide doped activated carbon fiber prepared by Sol–Gel method. Chem. Eng. J., 200(5), 619-626.