Features of sorption of 4-hydroxybenzaldehyde from aqueous solutions by Norit GAC 1240W activated carbon
Abstract
Activated carbons are among the most widespread inorganic sorbents, actively used in many areas of industry to extract organic toxicants. In this study, we investigated the features of sorption of a representative of a number of substituted benzaldehydes, para-hydroxybenzaldehyde (PHBA), from aqueous solutions by Norit GAC1240W activated carbon under static conditions. A comparison of the equilibrium characteristics of the sorption process was carried out using a commercial sample of the sorbent and the sample that was ground to powder. A different form of the obtained dependences was noted. An increase in the affinity of activated carbon to aromatic aldehyde was observed due to an increase in the area of interface between the aqueous solution of PHBA and the sorbent, as well as the uniformity of the interface.
The study evaluates the sorption isotherms using a formal approach based on the selection of sorption equations (Langmuir, Temkin, Freundlich) describing the obtained dependences as closely as possible. It has been noted that the highest correlation coefficients of the linear dependence for the granular sorbent were noted as a result of the presentation of the curve in the coordinates of the linearized Freundlich equation, for the ground sorbent - in the coordinates of the linearized Langmuir equation. Representation of the dependence of the capacity of carbon on the equilibrium concentration of hydroxybenzaldehyde in the solution in the coordinates of the Langmuir monomolecular sorption equation allowed calculating some equilibrium characteristics of the studied process (the energy of the sorption process, its enthalpy and entropy). It was noted that the absorption of para-hydroxybenzaldehyde from the solution is accompanied by an exothermic effect. In addition, some kinetic parameters of sorption were investigated - the time of achieving equilibrium and the rate constant of the studied process. The analysis of the kinetic curve of sorption of PHBA was carried out from the position of the pseudo-first, pseudo-second order equations, and Weber-Morris equation. It was noted that the pseudo-second order equation is optimal for describing the obtained dependence.
Thus, the study of the sorption extraction of para-hydroxybenzaldehyde from aqueous solutions using Norit GAC1240W activated carbon allowed determining the features of the equilibrium and kinetics of the studied process and evaluating the role of the surface area in the molecular adsorption of this compound.
Downloads
References
Mukhin V.M., Klushin V.N., Proizvodstvo i primenenie uglerodnyh adsorbentov, M., Rossiyskiy himiko-tekhnologicheskiy universitet im. D.I. Mendeleeva, 2012, 305 p.
Voronyuk I.V., Eliseeva T.V., Sorbtsionnye i khromatograficheskie protsessy, 2018, Vol. 18, No 2, pp. 231-237
Reshetnikova O.V., Yatsev A.M., Voronyuk I.V., Eliseeva T.V., Sorbtsionnye i khromatograficheskie protsessy, 2015, Vol. 15, No 4, pp. 571-577.
Sholohova, A.Yu., Eliseeva T.V., Buryak A.K., Kolloidnyy zhurnal, 2019, Vol. 81, No 5, pp. 676-680.
Kotel'nikova T.A., Kuznetsov B.V., Moreva A.A., Murav'eva G.P., Sorbtsionnye i khromatograficheskie protsessy, 2012, Vol. 12, No 2, pp. 295-303.
Koyuncu H., Applied Clay Science, 2008, Vol. 38, No 3-4, pp. 279-287.
Kohno G.V., Khokhlova G.P., Vestnik Kuzbasskogo gosudarstvennogo tekhnicheskogo universiteta, 2007, No 6, pp. 123-125.
Norit digital library. (http://www.irimex.ru/files/catalog/rubs/files/887/3.pdf) (data obrashcheniya: 28.09.2020).
p-Hydroxybenzaldehyde (https://go.drugbank.com/drugs/DB03560) (data obrashche-niya: 28.09.2020).
Handbook of heterogeneous catalysis, Wiley-VCH Verlag GmbH& Co. KGaA, Weinheim, Germany. Second Completely Revised and Enlarged Edition, Vol. 1, 2008, 3865 p.
Giles C.H., MacEwan C.H., Nakhwa S.N., Smith D., J. Chem. Soc., 1960, pp. 3973-3993.
Adsorbtsiya iz rastvorov na poverhnosti tverdyh tel, Red. G. Parfit, K. Rochester, M., Mir, 1986, 488 p.
Lagergren S., Sven K., Vetenskapsakad. Handl, 1898, Vol. 24, No 4, pp. 1-39.
Ho Y.S., McKay G., Process Biochem., 1999, Vol. 34, pp. 451-465.
Weber J.G., Asce J.M., Morris J.C., J. Sanit. Eng. Div. Am. Soc. Civ. Engrs., 1963, Vol. 89, pp. 31-59.
Rajoriya R.K., Prasad B., Indramani M., Kailas L. W., Chem. Bio-chem. Eng., 2007, No 21, pp. 219-226.
Sivakova L.G., Vestnik Kuzbasskogo gosudarstvennogo tekhnicheskogo uni-versiteta, 2007, No 2, pp. 94-96.
Romantsova I.V., Burakov A.E., Kucherova A.E., Izvestiya Samarskogo nauch-nogo tsentra Rossiyskoy akademii nauk, 2014, Vol. 16, No 4, pp. 611-614.
