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author:

Qi, Zhaoyang (Qi, Zhaoyang.) [1] | Zhou, Miaomiao (Zhou, Miaomiao.) [2] | Li, Ling (Li, Ling.) [3] (Scholars:李玲) | Qiu, Ting (Qiu, Ting.) [4] (Scholars:邱挺) | Ye, Changshen (Ye, Changshen.) [5] (Scholars:叶长燊)

Indexed by:

EI Scopus SCIE

Abstract:

Different zeolites were screened to achieve the aim of effective selective removal of p-xylene (PX) from the pure terephthalic acid (PTA) wastewater, and the ZSM-5 zeolite modified by NH4Cl was chosen as a suitable adsorbent because of the maximum equilibrium adsorption capacity and the largest selectivity factor. The selectivity factors of PX to Co2+ and PX to Mn2+ can attain 1778.069 and 1875.650, respectively, and the saturation adsorption capacity of PX even increases to 126.10 mg.g(1). First, the adsorption experiments were conducted at 298.15, 308.15, 318.15, and 328.15 K with the initial concentration of PX ranging from 50 to 180 mg.L-1 in a batch adsorber. The Langmuir model agreed better with the experimental results than did the Freundlich model. The adsorption parameters of thermodynamics are Delta S = -17.83 J.mol(1).K-1, Delta H = -12.33 kJ mol(1), and Delta G < 0, respectively. It is demonstrated that the adsorption of PX on the H-ZSM-5 zeolite is a spontaneous and exothermic physisorption. Second, the kinetics of PX adsorbed on the H-ZSM-5 zeolite was studied by batch adsorption. The results showed that the pseudo-second-order rate model can be used to better describe the adsorption behavior of PX on the H-ZSM-5 zeolite. The H-ZSM-5 zeolite is successfully regenerated using the high-temperature roasting method. On the basis of this, the molding process of the solid H-ZSM-5 zeolite was further studied. Finally, fixed bed adsorption was conducted in a tubular glassware instrument to obtain the breakthrough curves. The influences of operation parameters on the adsorption process in the fixed bed were discussed. The results showed that H+-exchanged ZSM-5 zeolite was a highly efficient material for selectively adsorbing PX from PTA wastewater.

Keyword:

Community:

  • [ 1 ] [Qi, Zhaoyang]Fuzhou Univ, Sch Chem Engn, Fuzhou 350116, Peoples R China
  • [ 2 ] [Zhou, Miaomiao]Fuzhou Univ, Sch Chem Engn, Fuzhou 350116, Peoples R China
  • [ 3 ] [Li, Ling]Fuzhou Univ, Sch Chem Engn, Fuzhou 350116, Peoples R China
  • [ 4 ] [Qiu, Ting]Fuzhou Univ, Sch Chem Engn, Fuzhou 350116, Peoples R China
  • [ 5 ] [Ye, Changshen]Fuzhou Univ, Sch Chem Engn, Fuzhou 350116, Peoples R China

Reprint 's Address:

  • 叶长燊

    [Ye, Changshen]Fuzhou Univ, Sch Chem Engn, Fuzhou 350116, Peoples R China

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Source :

JOURNAL OF CHEMICAL AND ENGINEERING DATA

ISSN: 0021-9568

Year: 2017

Issue: 3

Volume: 62

Page: 1047-1057

2 . 1 9 6

JCR@2017

2 . 0 0 0

JCR@2023

ESI Discipline: CHEMISTRY;

ESI HC Threshold:226

JCR Journal Grade:2

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count: 5

SCOPUS Cited Count: 5

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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