نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه شیمی، دانشکده علوم پایه، دانشگاه آزاد اسلامی واحد تهران مرکزی، تهران، ایران

2 مرکز پژوهش و فناوری شهید فهمیده، رضوانشهر، رشت، ایران

چکیده

هدف از انجام این پژوهش حذف یون نیترات با استفاده از نانو رس مونت موریلونیت‌هایی است که سطحشان توسط گروه عاملی اکتا دسیل آمین اصلاح شده است. در این پژوهش ابتدا نانو رس با استفاده از اکتادسیل آمین اصلاح شد و خصوصیات سطحی این نانوجاذب اصلاح شده با دستگاه‌های میکروسکوپ الکترونی روبشی(SEM) و طیف پراش اشعه ایکس(XRD) بررسی شد. در ادامه، فرایند جذب یون نیترات با استفاده از مدل جذب سطحی و با بررسی پارامترهای میزان زمان تماس بین جاذب و جذب شونده، میزان غلظت جذب شونده، تاثیر pH و تاثیر مقدار دوز جاذب در حذف نیترات مورد بررسی قرار گرفت. میزان جذب توسط دستگاه جذب اتمی ارزیابی شد. نتایج نشان داد که اصلاح سطح نانورس توسط گروه آمین سبب افزایش فاصله بین لایه‌ای از مقدار58/7 آنگستروم به 91/22 آنگستروم شده است و اندازه نانو ذرات اصلاح شده حدود 80 تا 100 نانو متر می‌باشد که با افزایش سطح نانو جاذب تعداد سایت‌های جذب فعال هم افزایش پیدا کرده است. در بررسی جذب یون نیترات هم حداکثر میزان جذب در pH برابر با 5، غلظت اولیه mg/l 100، زمان تماس min 40 و مقدار g 7/0 از نانو جاذب به دست آمد. در بررسی ایزوترم‌های تعادلی مشخص شد که فرایند جذب از دو ایزوترم لانگمویر و فروندلیش پیروی می‌کند و بالاترین ظرفیت جذب تک لایه برابر با mg/g 352/18 به دست آمد. سینتیک فرایند مذکور هم با مدل سینتیکی مرتبه دوم دارای تطابق است و مقدار جذب شونده در واحد جرم جاذب در حالت تعادل برابر با mg/g 518/2 است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Removal of Nitrate Ion from Aqueous Solution using Octa Decyl Amine Modified Montmorillonite Nanoclay

نویسندگان [English]

  • Mehdad Enkari 1
  • Elham Ebrahimi Aghmasjed 2

1 Department of Chemistry, Faculty of Basic Sciences, Islamic Azad University, Tehran Central Branch, Tehran, Iran

2 Shahid Fahmidah Research and Technology Center, Rasht, Iran

چکیده [English]

The purpose of this study was to remove nitrate ion using nano clay montmorillonites whose surface was modified using the octa decy lamine functional group. In this study, nano clay was first modified using octa decyl amine and the surface properties of this nanoparticle modified by scanning electron microscopy (SEM) and X-ray diffraction spectrum (XRD) were investigated. In the next step, the nitrate ion adsorption process was investigated by using adsorption model and by examining the parameters of contact time between adsorbent and adsorbent, absorbent concentration, pH effect and effect of adsorbent dose on nitrate removal. Absorption rate was evaluated by atomic absorption. The results showed that the correction of the nanoclay surface by the amine group increased the interlayer spacing from 7.58 Angstrom to 22.91 Angstrom and the size of the modified nanoparticles was about 80 to 100 nanometers. By increasing the nano absorbing surface, the number of sites active absorption has increased. In the study of adsorption of nitrate ions, the maximum adsorption at pH was 5, the initial concentration of 100 mg/l, the contact time of 40 min, and the 0.7 g of nano-adsorbent. In the study of equilibrium isotherms, it was found that the adsorption process follows Langmuir and Freundlich isotherms and the highest single-layer adsorption capacity was 18.352 mg/g. The kinetics of the above process is consistent with the second-order kinetic model and the amount of absorbance per unit mass of the adsorbent in equilibrium is 2.518 mg/g.

کلیدواژه‌ها [English]

  • Octadecylamine
  • Adsorption
  • Aqueous Solution
  • Nanoclay
  • Nitrate Ion
Arora A. and Padua G. (2010). Nanocomposites in food packaging. J. Food Sci., 75(3), 43– 49.
 
Azeredo H. M. C. D. (2009). Nanocomposites for food packaging applications. J. Food Res. Int., 42(2), 1240–1253.
 
Bhatnagara A., Kumarb E. and Sillanpääc M. (2014). Nitrate removal from water by nanoalumina: characterization and sorption studies. Chem. Eng. J., 163(3), 317-323.
 
Bhatnagar M. and Sillanpää M. (2011). A review of emerging adsorbents for nitrate removal from water. Chem. Eng. J., 168(5), 493–504.
 
Calderon J. U., Lennox B. and Kamal M. R. (2017).  Thermally stable phosphoniummontmorillonite organoclays. Appl. Clay Sci., 40(4), 90-98.
 
Comly H. H. (1997). Cyanosis in infants caused by nitrates in well water, J. Am. Med. Assoc., 257(7), 2788–2792.
 
Demiral H. and Gunduzoglu G. (2016). Removal of nitrate from aqueous solutions by activated carbon prepared from sugar beet bagasse. Bioresour. Technol. 101(3), 1675–1680.
 
Della Rocca V. and Belgiorno S. (2007). Overview of in-situ applicable nitrate removal processes. Desal., 204(6), 46–62.
 
Hamoudi S. and Belkacemi K. (2013). Adsorption of nitrate and phosphate ions from aqueous solutions using organicallyfunctionalized silica materials: Kinetic modeling. J. Fuel, 110(2), 107-113.
 
Jaafarzadeh N., Ahmadi M., Amiri H., Yassin M. H. and Martinez S. S. (2015). Predicting Fenton modification of solid waste vegetable oil industry for arsenic removal using artificial neural networks. J. Taiwan Inst. Chem. Eng., 43(3), 873–878.
 
Kavitha D. and Namasivayam C. (2016). Exprimental and kinetic studies on methylene blue adsorption by coir pith carbon. Bioresour. Technol., 98(2), 14–21.
 
Kim J. and Benjamin M. M. (2016). Modeling a novel ion exchange process for arsenic and nitrate removal. Water Res., 38(8), 20532062.
 
Kumar A. and Viraraghavan T. (2015). Nitrate removal fromdrinking water - Review. J. Environ. Eng., 123(4), 371-380.
 
Malakootian M., Yaghmaian K. and Tahergorabi M. (2011). The efficiency of nitrate removal in drinking water using iron nano-particles: determination of optimum conditions. J. Toloo-e-behdasht, 10(2), 35-44 [In Persian].
 
 Malberg J., Savage E. and Osteryoung J. (2016). Nitrates in drinking water and the early onset of hypertension. Environ. Pollut., 15(3), 155160.
 
Mautner A., Kobkeatthawin T. and Bismarck A. (2017). Efficient chnitrates from water with cationic cellulose nanopaper membranes. Resour. Efficient Technol., 3(1), 22–28.
 
Mishra A. K., Allauddin S., Narayan R., Aminabhavi T. M. and Raju K. (2014). Characterization of surfacemodified montmorillonite nanocomposites. Ceramics Int., 38(2), 929-934.
 
Mena-Duran C. J., Sun Kou M. R., Lopez T., Azamar-Barrios J. A., Aguilar D. H. (2016). Nitrate removal using natural clays. Appl. Surf. Sci., 253(13), 5762-5766.
 
Repo E., Koivula R., Harjula R. and Sillanpää M. (2014). Effect of EDTA and some other interferingspecies on the adsorption of Co(II) by EDTA-modified chitosan. Desal., 321(3), 93-102.
 
McAdam E. J. and Judd S. J. (2016). A review of membrane bioreactor potential for nitrate removal from drinking water. Desal., 196(5), 135–148.
 
Narayan R. L. and King T. S. (2012). Hydrogen adsorption states on silica-suported Ru- Ag and Ru-Cu bimetalliccatalysts investigated via microcalorimetry, Thermochimia Acta, 312(5), 105-114.
 
Pintar A., Batista J. and Levec J. (2015). Integrated ion exchange/catalytic process for efficient removal of nitrates from drinking water. Chem. Eng. Sci., 56(3), 1551-1559.
 
Rahman S. N. A. (2016). Preparation and characterization of tertiary amine functionalized MCM-41 for removal of nitrate from aqueous solution. Dissertation, Chemical Engineering, Universiti Teknologi Petronas.
 
Ren X., Sun P. and Order M. (2016). Carbon nanotubes as adsorbents in environmental pollution management: a review. Chem. Eng. J., 170 (2), 395–410.
 
Riha K., Michalski G., Gallo E., Lohse K., Brooks P. and Meixner T. (2014). High atmospheric nitrate inputs and nitrogen turnover in semi-arid urban catchments, J. Ecosys., 17(2), 1–17.
 
Santamaria P. (2006). Nitrate in vegetables: toxicity, content, intake and EC regulation, J. Sci. Food Agric. 86(1), 10–17.
 
Schoeman J. and Steyn A. (2015). Nitrare removal with reverse osmosis in a rural area in South Africa. Desal., 15(4), 15-26.
 
Seliem M. K., Komarneni S., Byrne T., Cannon F. and Shahien M. (2017). Removal of nitrate by synthetic organosilicas and organoclay: Kinetic and isotherm studies. Sep. Puri. Technol., 110(4), 181-187.
 
Shannon M. A., Bohn P. W., Elimelech M., Georgiadis J. G. B. J. and Marinas A. M. (2008). Science and technology for water purification in the coming decades. Nature, 452(4), 3–10.
 
 
Singla P., Mehta R. and Nath S. (2016). Clay modification by the use of organic cations. Green Sustain. Chem., 14(2), 21-25.
 
Varadwaj G. B. B., Rana S. and Parida K. (2015). Amine functionalized K10 montmorillonite: a solid acid–base catalyst for the Knoevenagel condensation reaction. Dalton Trans., 42(3), 5122–5129.
 
Vermeer I. T., Pachen D. M., Dallinga J. W., Kleinjans J. C. and Maanen J. M. (1998). Volatile n-nitrosamine formation after intake of nitrate at the ADI level in combination with an amine-rich diet. Environ. Health Perspect., 106(5), 459–463.
 
Wang Y. C., Szeto Y. S., Cheung W. H. and Etal M. (2013). Equilibrium studies for acid dye adsorption onto chitosan. Langmuir., 19(2), 7888-7894.
 
Westerhoff P. and Doudrick K. (2009). Nitrates in groundwater: treatment technologies for today and tomorrow. J. Southwest Hydrol., 8(4), 30-31.
 
Wu P., Long H. and Zhu N. (2016). Evaluation of Cs+ removal from aqueous solution by adsorption on ethylamine-modified montmorillonite. Chem. Eng. J., 225(3), 237– 244.
 
Yeong Y. F. and Lau Y. L. (2016). Optimization of nitrate removal from aqueous solution by amine functionalized MCM-41 using response surface methodology. Procedia Eng., 148(3), 1239 – 1246.
 
Zhu J., Wang T., Zhu R., Ge F. and Yuan P. (2014). Expansion characteristics of organo- montmorillonites during the intercalation, aging, drying and rehydration processes: Effect of surfactant/CEC ratio. Colloid. Surf. A: Physicochem. Eng. Aspects., 384(1), 401407.
 
Zhuang Y. H. and Zhang T.C. (2015). Effects of dissolved oxygen on formation of corrosion products and contaminant oxygen and nitrate reduction in zero valent iron systems with or without aqueous Fe. J. Water Res., 39(3), 1751-1760.