KINETICS MODELING AND ISOTHERMS FOR ADSORPTION OF NITRATE FROM AQUEOUS SOLUTION BY WHEAT STRAW

Hedieh Ahmadpari; Mohsen Eskafi Noghany; Behnam Rigi Ladez; Babak Mehrparvar; Saeed Momeni

doi:10.18616/ta.v25i0.5301

KINETICS MODELING AND ISOTHERMS FOR ADSORPTION OF NITRATE FROM AQUEOUS SOLUTION BY WHEAT STRAW

Authors

Hedieh Ahmadpari M.Sc. Graduate of Irrigation and Drainage, Department of Irrigation and Drainage, College of Aburaihan, University of Tehran, Iran
Mohsen Eskafi Noghany Expert, Department of irrigation and drainage, College of Aburaihan, University of Tehran, Iran
Behnam Rigi Ladez M.Sc. Student of Irrigation and Drainage, University of Zabol, Iran
Babak Mehrparvar Master of Civil Engineering-Hydraulic Structures, University of Mohagheg Ardebili, Iran.
Saeed Momeni Expert of Central Laboratory, College of Aburaihan, University of Tehran, Iran

DOI:

https://doi.org/10.18616/ta.v25i0.5301

Abstract

Nitrate is a colorless, odorless chemical substance with a chemical formulation of NO₃^- and average mass of 62.0049 gr/ Mol. According to an announcement of the world health organization (WHO), the standard amount of Nitrate in potable water is at most 50 ml/ lit (based on nitrate). Nitrate enters into the body and is transformed to nitrite by digestive system’s bacteria, then enters to the circulatory system and oxides the exiting iron in Hemoglobin of blood which converts the iron capacity from 2 to 3. As a result of this process Hemoglobin is converted to Methemoglobin which has far more less capacity in oxygen delivery. Therefore, the tissues cannot receive sufficient oxygen and it causes a disease called “Methemoglobinemia”. The objective of this study was to investigate the nitrate removal using wheat straw and determining the adsorption isotherms and kinetics. In this study, nitrate solutions were prepared from potassium nitrate salt. The pH values of the solutions were adjusted by NaOH and HCl at a concentration of 0.1 molar. The pH of the solution was adjusted to different values (4 to 13). Kinetics models of Ho et al and Lagergren were used to describe the data. Isotherm models of Langmuir and Freundlich were used to describe the data. The results showed that the maximum capacity of wheat straw in nitrate adsorption occurred at pH=6 and contact time 140 minutes. Equilibrium models (Langmuir and Freundlich) and non-equilibrium (Ho et al and Lagergren) were used to investigate the adsorption process. Comparing the determination coefficients between measured data and obtained value from Ho’s model (R²= 0.97) and Lagergren model (R²= 0.91) showed that the Ho’s model describes experimental data better. Also, comparing the Langmuir and Freundlich isotherm for nitrate adsorption by wheat straw showed that Freundlich isotherm (R²= 0.98) was more proper than Langmuir isotherm (R²= 0.83) in describing adsorption process.

Downloads

Download data is not yet available.

Downloads

PDF (Português (Brasil))

Published

2019-10-07

How to Cite

Ahmadpari, H., Noghany, M. E., Ladez, B. R., Mehrparvar, B., & Momeni, S. (2019). KINETICS MODELING AND ISOTHERMS FOR ADSORPTION OF NITRATE FROM AQUEOUS SOLUTION BY WHEAT STRAW. Tecnologia E Ambiente, 25, 203–214. https://doi.org/10.18616/ta.v25i0.5301

Download Citation

Issue

Vol. 25 (2019): Tecnologia e Ambiente

Section

Artigos

License

Na qualidade de titular dos direitos autorais relativos à obra acima descrita, o autor, com fundamento no artigo 29 da Lei n. 9.610/1998, autoriza a UNESC – Universidade do Extremo Sul Catarinense, a disponibilizar gratuitamente sua obra, sem ressarcimento de direitos autorais, para fins de leitura, impressão e/ou download pela internet, a título de divulgação da produção científica gerada pela UNESC, nas seguintes modalidades: a) disponibilização impressa no acervo da Biblioteca Prof. Eurico Back; b) disponibilização em meio eletrônico, em banco de dados na rede mundial de computadores, em formato especificado (PDF); c) Disponibilização pelo Programa de Comutação Bibliográfica – Comut, do IBICT (Instituto Brasileiro de Informação em Ciência e Tecnologia), órgão do Ministério de Ciência e Tecnologia.

O AUTOR declara que a obra, com exceção das citações diretas e indiretas claramente indicadas e referenciadas, é de sua exclusiva autoria, portanto, não consiste em plágio. Declara-se consciente de que a utilização de material de terceiros incluindo uso de paráfrase sem a devida indicação das fontes será considerado plágio, implicando nas sanções cabíveis à espécie, ficando desde logo a FUCRI/UNESC isenta de qualquer responsabilidade.

O AUTOR assume ampla e total responsabilidade civil, penal, administrativa, judicial ou extrajudicial quanto ao conteúdo, citações, referências e outros elementos que fazem parte da obra.