کارآیی فرایند تبادل یونی در حذف نیترات از آب هم‌دماهای تعادلی جذب نیترات توسط رزین Purolite A-400

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه گیلان

چکیده

فرآیند تبادل یونی به علت سهولت اجرا، هزینه کم و کارآیی بالا یکی از مناسب­ترین روش­های بهبود کیفیت آب­های آلوده به نیترات است. در تحقیق حاضر، همدماهای جذب نیترات با استفاده از رزین آنیونی  Purolite A-400در دو pH برابر 5/6 و 5/7 و در دو دمای 20 و 25 درجه سلسیوس، با هشت غلظت اولیه­ی 5، 20، 40، 60، 80، 100، 150 و 200 میلی­گرم در لیتر نیترات بررسی شد. پارامترهای جذبی رزین با بهره­گیری از چهار مدل همدمای جذب لانگمویر، فرندلیچ، ردلیچ- پترسون و سیپس مورد ارزیابی قرار گرفت. با در نظرگرفتن هم­زمان دو معیار ضریب تبیین و آزمون آماری مربع­ کی، مدل لانگمویر و پس از آن مدل سیپس و ردلیچ – پترسون بهترین برازش را به داده­های جذبی نشان دادند. برازش مدل فرندلیچ بر نتایج آزمایش با وجود ضریب تبیین بالا، به دلیل نتایج ضعیف آزمون مربع کی، مناسب تشخیص داده نشد. با توجه به نتایج مدل لانگمویر، می­توان گفت که رزین Purolite A-400 برای جذب نیترات در دمای C°25 تمایل پیوندی بیشتری (به طور میانگین 30 درصد) نسبت به دمای C°20  دارد. همچنین جذب­سطحی نیترات توسط رزین در pH برابر 5/6 نسبت به 5/7  به طور میانگین 25 درصد بیشتر بود.
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Ion Exchange Efficiency of Nitrate Removal from Water 1- Equilibrium Sorption Isotherms for Nitrate on Resin Purolite A-400

نویسندگان [English]

  • A Moussavi
  • H Asadi
  • M Esfandbod
چکیده [English]

In the current study, an anion exchange resin, Purolite A 400, was employed to investigate nitrate removal from aqueous solutions. For the adsorption isotherm study, 0.15 g of resin was contacted with 50 mL of NaNO3 solution at the concentrations of 5, 20, 40, 60, 80, 100, 150, and 200 mg-NO3 L-1 with two pHs of 6.5 and 7.5 at two equilibrium temperatures of 20 and 25 oC for 24 h with continuous shaking. Aadsorption characteristics of the resin for nitrate were evaluated by modeling of adsorption isotherms using Langmuir, Freundlich, Redlich - Peterson and Sips models. Based on the statistics of Chi-square test and correlation coefficient, Langmuir equation showed the best fit to the data. Sips and Redlich–Peterson equations followed Langmuir model, respectively. Freundlich equation fitted poorly to the date, though its correlation coefficient was significant. Comparison and relations among the calibrated parameters of the models showed that Sips and Redlich–Peterson equations were similar to Langmuir equation. Based on the latter equation, Purolite A-400 revealed higher (average 30 percent) bonding energy at 25 oC than 20 oC. Adsorption capacity of the resin also was 25 percent higher at pH 6.5 than pH 7.5.
 
 

کلیدواژه‌ها [English]

  • Equilibrium adsorption
  • Equilibrium concentration
  • Langmuir
  • Freundlich
  • Redlich – Peterson
  • Sips

مراجع

Allen SJ, Gan Q, Matthews R and Johnson PA, 2003. Comparison of optimized isotherm models for basic dye adsorption by kudzu. Bioresource Technology 88: 143–152.
Ann M and Franson H, 1992. Standard Methods for the Examination of Water and Waste Water. 19th Edition. American Public Health Association.
Arslanoglu FN, Kar F and Arslan N, 2005. Adsorption of dark coloured compounds from peach pulp by using powdered-activated carbon. Journal of Food Engineering 71: 156-163.
Bae BU, Jung YH, Han WW and Shin HS, 2002. Improved brine recycling during nitrate removal using ion exchange. Journal of Water Research 36: 3330-3340
Boumediene M and Achour D, 2004. Denitrification of the underground waters by specific resin exchange of ion. Desalination 168: 187-194.
Bouwer H, 1989. Agricultural contamination: problems and solutions. Water Environment and Technology 1: 292–297.
Chabani M, Amrane A and Bensmaili A, 2006. Kinetic modelling of the adsorption of nitrates by ion exchange resin. Chemical Engineering Journal 125: 111-117.
Chabani M, Amrane A and Bensmaili A, 2007. Kinetics of nitrates adsorption on Amberlite IRA-400. Desalination 206: 560-567.
Chabani M, Amrane A and Bensmaili A, 2009. Equilibrium sorption isotherms for nitrate on resin Amberlite IRA-400. Journal of Hazardous Materials 165: 27-33.
Clifford DA and Liu X, 1993. Ion exchange for nitrate removal. American Water Works Association 85(4): 135-143.
Donat R, Akdogan A, Erdem E and Cetisli H, 2005. Thermodynamics of Pb2+ and Ni2+ adsorption onto natural bentonite from aqueous solutions. Journal of Colloid and Interface Science 286: 43–52.
Freundlich HMF, 1906. Over the adsorption in solution. Journal of Physical Chemistry 57: 385-470.
Ho YS, 2006. Isotherms for the sorption of lead onto peat: comparison of linear and non-linear methods. Polish Journal of Environmental Studies 15: 81–86.
Ho YS, 2004. Selection of optimum sorption isotherm. Carbon 42: 2113–2130.
Ho YS, Porter JF and McKay G, 2002. Equilibrium isotherm studies for the sorption of divalent metal ions onto peat: copper, nickel and lead single component systems. Water, Air and Soil Pollution 141: 1–33.
Langmuir I, 1916. The constitution and fundamental properties of solids and liquids. Journal of the American Chemical Society 38: 2221–2295
Logan TJ, Eckert DJ and DG Beak, 1994. Tillage, crop and climatic effects on runoff and tile drainage losses of nitrate and 4 herbicides. Soil and Tillage Research 30: 75-103.
Mizuta K, Matsumoto T, Hatate Y, Nishihara K and Nakanishi T, 2004. Removal of nitrate-nitrogen from drinking water using bamboo powder charcoal. Bioresource Technology 95: 255–257.
Ng JCY, Cheung WH and McKay G, 2002. Equilibrium studies of the sorption of Cu(II) ions onto chitosan. Journal of Colloid and Interface Science 255: 64–74.
Öztürk N and Ennil Bektas T, 2004. Nitrate removal from aqueous solution by adsorption onto various materials. Journal of Hazardous Materials 112: 155–162.
PapageorgiouSK, Katsaros FK Kouvelos EP, Nolan, JW Deit HL and Kanellopoulos NK, 2006. Heavy metal sorption by calcium alginate beads from Laminaria digitata, Journal of Hazardous Materials 137: 1765–1772.
Ramachandran V and Souza TJD, 1999. Adsorption of cadmium by Indian soils. Water, Air and Soil Pollution 111: 225-234.
Ratkowsky DA, 1990. Handbook of  Nonlinear  Regression Models. Marcel Dekker Inc., New York.
Redlich O and Peterson DL, 1959. A useful adsorption isotherm. Journal of Physical Chemistry 63: 1024–1030
Samatya S, Kabay N, Yuksel U, Arda M and Yuksel M, 2006. Removal of nitrate from queous solution by nitrate selective ion exchange resins. Reactive and Functional polymers 66: 1206-1214.
Scheidegger AM, Fendrof M and Sparks DL, 1996. Mechanisms of nickel sorption on pyrophylite: Macroscopic and microscopic approaches. Soil Science Society of America Journal 60: 1763-1772.
Tiwari RP, Bala Ramudu P, Srivastava RK and Gupta MK, 2007. Sorption and desorption studies of metallic zinc on an alluvial soil. Iranian Journal of Environmental Health Science and Engineering 4: 139-146
Vasanth Kumar K, Porkodi K and Rocha F, 2008. Comparison of various error functions in predicting the optimum isotherm by linear and non-linear regression analysis for the sorption of basic red 9 by activated carbon. Journal of Hazardous Materials 150: 158–165.
Wu FC, Liu BL, Wu KT and Tseng RL, 2010. A new linear form analysis of Redlich–Peterson isotherm equation for the adsorptions of dyes. Chemical Engineering Journal 162: 21–27.
Zhou ML, Martin G, Taha S and Sant’anna F, 1996. Adsorption isotherm comparison and modeling in liquid phase onto activated carbon. Water Research 32: 1109–1118.

فایل ها

هم رسانی

ارجاع به این مقاله

آمار