- Email: [email protected]
Comments on “Novel molecularly imprinted polymer based on β[email protected] oxide: Synthesis and application for selective diphenylamine determination”
Journal of Colloid and Interface Science xxx (2018) xxx–xxx
Contents lists available at ScienceDirect
Journal of Colloid and Interface Science journal homepage: www.elsevier.com/locate/jcis
Comments on ‘‘Novel molecularly imprinted polymer based on b-cyclodextrin@graphene oxide: Synthesis and application for selective diphenylamine determination” Yuan-dong Huang School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
a r t i c l e
i n f o
a b s t r a c t
Article history: Received 8 July 2018 Accepted 1 September 2018 Available online xxxx
This comment mainly deals with a mistake of applying pseudo-first-order kinetic model for testing the kinetic behaviors of adsorption. Ó 2018 Elsevier Inc. All rights reserved.
Keywords: Adsorption Kinetic model Pseudo-first-order Pseudo-second-order
Recently Sedghi et al. [1] published the paper entitled above. In Section 3.2.3 ‘‘Adsorption kinetics‘‘, the pseudo-first-order model (Eq. (1)) and pseudo-second-order model (Eq. (2)) are given bellow:
1=Q t ¼ K 1 =Q e t þ 1=Q e
ð1Þ
t=Q t ¼ 1=K 2 Q 2e þ t=Q e 1
ð2Þ 1
where Q e (mg g ) and Q t (mg g ) are the adsorption capacities at equilibrium and at arbitrary time t (min), respectively. K 1 (g mg1 min) and K 2 (g mg1 min) are the pseudo-first-order and pseudosecond-order rate constants, respectively. However, the pseudo-first-order kinetic model, Eq. (1) is not correct. In this equation, the unit of the term K 1 =Q e t does not agree with the units of the other two terms 1=Q t and 1=Q e . Thus, the results and conclusion from adsorption kinetics in the published paper by Sedghi et al. [1] might not be appropriate. The pseudo-second-order kinetic model, Eq. (2) is correct. This equation can be rearranged as 1=Q t ¼ 1=K 2 Q 2e t þ 1=Q e . Clearly, Eqs. (1) and (2) are the same when K 1 ¼ 1=K 2 Q e . In the published paper by Sedghi et al. [1], no references are cited for the adsorption kinetic models. In fact, the linear form of the pseudo-first-order kinetic model should be expressed by the Lagergren equation as follows [2]:
E-mail address: [email protected]
logðQ e Q t Þ ¼ logQ e
K1t 2:303
ðor lnðQ e Q t Þ ¼ lnQ e K 1 t Þ
In recent years, use of the wrong pseudo-first-order kinetic model 1=Q t ¼ K 1 =Q e t þ 1=Q e in adsorption systems can also be found in Journal of Industrial and Engineering Chemistry [3], European Polymer Journal [4], Colloids and Surfaces B: Biointerfaces [5], Microporous and Mesoporous Materials [6], Ecotoxicology and Environmental Safety [7], and Journal of the Taiwan Institute of Chemical Engineers [8]. This type of mistake could not be occurred if the authors utilized the pseudo-first-order kinetic equation from the original material by Lagergren [2] rather than from secondary materials.
References [1] R. Sedghi, B. Heidari, M. Yassari, Novel molecularly imprinted polymer based on b-cyclodextrin@graphene oxide: synthesis and application for selective diphenylamine determination, J. Colloid Interface Sci. 503 (2017) 47–56. [2] S. Lagergren, Zur theorie der sogenannten adsorption gelöster stoffe, Bihang till K. Svenska Vet. Akad, Handlingar 24 (1898) 1–39. [3] L. Lu, J. Li, D.H.L. Ng, P. Yang, P. Song, M. Zuo, Synthesis of novel hierarchically porous Fe3O4@MgAl–LDH magnetic microspheres and its superb adsorption properties of dye from water, J. Ind. Eng. Chem. 46 (2017) 315–323. [4] L.P. Jiang, F.Y. Chai, Q. Chen, Soft magnetic nanocomposite microgels by in-situ crosslinking of poly acrylic acid onto superparamagnetic magnetite nanoparticles and their applications for the removal of Pb(II) ion, Eur. Polym. J. 89 (2017) 468–481. [5] R. Sedghi, M. Yassari, B. Heidari, Thermo-responsive molecularly imprinted polymer containing magnetic nanoparticles: synthesis, characterization and adsorption properties for curcumin, Colloids Surf. B: Biointerfaces 162 (2018) 154–162.
https://doi.org/10.1016/j.jcis.2018.09.001 0021-9797/Ó 2018 Elsevier Inc. All rights reserved.
Please cite this article in press as: Y.-d. Huang, J. Colloid Interface Sci. (2018), https://doi.org/10.1016/j.jcis.2018.09.001
2
Y.-d. Huang / Journal of Colloid and Interface Science xxx (2018) xxx–xxx
[6] K. Seaton, I. Little, C. Tate, R. Mohseni, M. Roginskaya, V. Povazhniy, A. Vasiliev, Adsorption of cesium on silica gel containing embedded phosphotungstic acid, Microporous Mesoporous Mater. 244 (2017) 55–66. [7] A. Asfaram, M. Ghaedi, G.R. Ghezelbash, F. Pepe, Application of experimental design and derivative spectrophotometry methods in optimization and analysis
of biosorption of binary mixtures of basic dyes from aqueous solutions, Ecotoxicol. Environ. Saf. 139 (2017) 219–227. [8] J.B. Pang, F.L. Fu, Z.C. Ding, J.W. Lu, N. Li, B. Tang, Adsorption behaviors of methylene blue from aqueous solution on mesoporous birnessite, J. Taiwan Inst. Chem. Eng. 77 (2017) 168–176.
Please cite this article in press as: Y.-d. Huang, J. Colloid Interface Sci. (2018), https://doi.org/10.1016/j.jcis.2018.09.001
Contents lists available at ScienceDirect
Journal of Colloid and Interface Science journal homepage: www.elsevier.com/locate/jcis
Comments on ‘‘Novel molecularly imprinted polymer based on b-cyclodextrin@graphene oxide: Synthesis and application for selective diphenylamine determination” Yuan-dong Huang School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
a r t i c l e
i n f o
a b s t r a c t
Article history: Received 8 July 2018 Accepted 1 September 2018 Available online xxxx
This comment mainly deals with a mistake of applying pseudo-first-order kinetic model for testing the kinetic behaviors of adsorption. Ó 2018 Elsevier Inc. All rights reserved.
Keywords: Adsorption Kinetic model Pseudo-first-order Pseudo-second-order
Recently Sedghi et al. [1] published the paper entitled above. In Section 3.2.3 ‘‘Adsorption kinetics‘‘, the pseudo-first-order model (Eq. (1)) and pseudo-second-order model (Eq. (2)) are given bellow:
1=Q t ¼ K 1 =Q e t þ 1=Q e
ð1Þ
t=Q t ¼ 1=K 2 Q 2e þ t=Q e 1
ð2Þ 1
where Q e (mg g ) and Q t (mg g ) are the adsorption capacities at equilibrium and at arbitrary time t (min), respectively. K 1 (g mg1 min) and K 2 (g mg1 min) are the pseudo-first-order and pseudosecond-order rate constants, respectively. However, the pseudo-first-order kinetic model, Eq. (1) is not correct. In this equation, the unit of the term K 1 =Q e t does not agree with the units of the other two terms 1=Q t and 1=Q e . Thus, the results and conclusion from adsorption kinetics in the published paper by Sedghi et al. [1] might not be appropriate. The pseudo-second-order kinetic model, Eq. (2) is correct. This equation can be rearranged as 1=Q t ¼ 1=K 2 Q 2e t þ 1=Q e . Clearly, Eqs. (1) and (2) are the same when K 1 ¼ 1=K 2 Q e . In the published paper by Sedghi et al. [1], no references are cited for the adsorption kinetic models. In fact, the linear form of the pseudo-first-order kinetic model should be expressed by the Lagergren equation as follows [2]:
E-mail address: [email protected]
logðQ e Q t Þ ¼ logQ e
K1t 2:303
ðor lnðQ e Q t Þ ¼ lnQ e K 1 t Þ
In recent years, use of the wrong pseudo-first-order kinetic model 1=Q t ¼ K 1 =Q e t þ 1=Q e in adsorption systems can also be found in Journal of Industrial and Engineering Chemistry [3], European Polymer Journal [4], Colloids and Surfaces B: Biointerfaces [5], Microporous and Mesoporous Materials [6], Ecotoxicology and Environmental Safety [7], and Journal of the Taiwan Institute of Chemical Engineers [8]. This type of mistake could not be occurred if the authors utilized the pseudo-first-order kinetic equation from the original material by Lagergren [2] rather than from secondary materials.
References [1] R. Sedghi, B. Heidari, M. Yassari, Novel molecularly imprinted polymer based on b-cyclodextrin@graphene oxide: synthesis and application for selective diphenylamine determination, J. Colloid Interface Sci. 503 (2017) 47–56. [2] S. Lagergren, Zur theorie der sogenannten adsorption gelöster stoffe, Bihang till K. Svenska Vet. Akad, Handlingar 24 (1898) 1–39. [3] L. Lu, J. Li, D.H.L. Ng, P. Yang, P. Song, M. Zuo, Synthesis of novel hierarchically porous Fe3O4@MgAl–LDH magnetic microspheres and its superb adsorption properties of dye from water, J. Ind. Eng. Chem. 46 (2017) 315–323. [4] L.P. Jiang, F.Y. Chai, Q. Chen, Soft magnetic nanocomposite microgels by in-situ crosslinking of poly acrylic acid onto superparamagnetic magnetite nanoparticles and their applications for the removal of Pb(II) ion, Eur. Polym. J. 89 (2017) 468–481. [5] R. Sedghi, M. Yassari, B. Heidari, Thermo-responsive molecularly imprinted polymer containing magnetic nanoparticles: synthesis, characterization and adsorption properties for curcumin, Colloids Surf. B: Biointerfaces 162 (2018) 154–162.
https://doi.org/10.1016/j.jcis.2018.09.001 0021-9797/Ó 2018 Elsevier Inc. All rights reserved.
Please cite this article in press as: Y.-d. Huang, J. Colloid Interface Sci. (2018), https://doi.org/10.1016/j.jcis.2018.09.001
2
Y.-d. Huang / Journal of Colloid and Interface Science xxx (2018) xxx–xxx
[6] K. Seaton, I. Little, C. Tate, R. Mohseni, M. Roginskaya, V. Povazhniy, A. Vasiliev, Adsorption of cesium on silica gel containing embedded phosphotungstic acid, Microporous Mesoporous Mater. 244 (2017) 55–66. [7] A. Asfaram, M. Ghaedi, G.R. Ghezelbash, F. Pepe, Application of experimental design and derivative spectrophotometry methods in optimization and analysis
of biosorption of binary mixtures of basic dyes from aqueous solutions, Ecotoxicol. Environ. Saf. 139 (2017) 219–227. [8] J.B. Pang, F.L. Fu, Z.C. Ding, J.W. Lu, N. Li, B. Tang, Adsorption behaviors of methylene blue from aqueous solution on mesoporous birnessite, J. Taiwan Inst. Chem. Eng. 77 (2017) 168–176.
Please cite this article in press as: Y.-d. Huang, J. Colloid Interface Sci. (2018), https://doi.org/10.1016/j.jcis.2018.09.001