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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

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2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2020, Vol. 14 Issue (2) : 26    https://doi.org/10.1007/s11783-019-1205-5
RESEARCH ARTICLE
Dibutyl phthalate adsorption characteristics using three common substrates in aqueous solutions
Tiancui Li1,2, Yaocheng Fan1,2, Deshou Cun1,2, Yanran Dai1, Wei Liang1()
1. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
2. University of Chinese Academy of Sciences, Beijing 100039, China
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Abstract

• DBP adsorption was tested using three kinds of substrates in constructed wetlands.

• The DBP adsorption capacity followed the order: steel slag>gravel>shell sand.

• High temperatures increased the DBP adsorption capacity in the substrates.

• DOM consistently inhibited the DBP adsorption onto steel slag and gravel.

In recent years, the presence and adverse impacts of phthalic acid esters in aquatic environments have gained increasing attention. This work investigated the adsorption behavior of a typical phthalic acid ester, dibutyl phthalate (DBP), onto steel slag, gravel, and shell sand (substrates commonly used in constructed wetlands). The influence of dissolved organic matter (DOM) on DBP adsorption was investigated using humic acid as a proxy for DOM. The results demonstrated that the adsorption of DBP to three substrates reached equilibrium within 96 h, and the adsorption kinetics were well fitted by a pseudo-second-order model. The DBP adsorption isotherms were best fitted by the Langmuir adsorption model. The DBP adsorption capacity decreased in the order of steel slag>gravel>shell sand, with values of 656 mg/kg, 598 mg/kg, and 6.62 mg/kg at 25°C, respectively. DBP adsorbed to the surface of all substrates in a monolayer via an endothermic process. The DBP adsorption capacities of steel slag and gravel decreased as the DOM content increased. The DBP adsorption mechanisms to steel slag and gravel mainly involved the surface coordination of DBP with –OH or –COOH groups and electrostatic interactions. The results of this work suggest that steel slag and gravel may be ideal substrates for use in constructed wetlands to treat wastewater polluted with DBP.

Keywords Adsorption      Dibutyl phthalate (DBP)      Dissolved organic matter      Substrates     
Corresponding Author(s): Wei Liang   
Issue Date: 27 December 2019
 Cite this article:   
Tiancui Li,Yaocheng Fan,Deshou Cun, et al. Dibutyl phthalate adsorption characteristics using three common substrates in aqueous solutions[J]. Front. Environ. Sci. Eng., 2020, 14(2): 26.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-019-1205-5
https://academic.hep.com.cn/fese/EN/Y2020/V14/I2/26
Fig.1  N2 adsorption-desorption isotherms of steel slag (a), gravel (b), and shell sand (c).
Substrates Steel slag Gravel Shell sand
BET surface area (m2/g) 3.697 1.099 1.531
Total pore volume (cm3/g) 0.009855 0.004290 0.007041
Adsorption average pore diameter (nm) 106.6 156.1 183.9
Tab.1  BET surface areas and pore volumes of three substrates
Fig.2  FTIR spectra of dibutyl phthalate before and after adsorption to steel slag (a), gravel (b), and shell sand (c).
Fig.3  Kinetics data for the adsorption of dibutyl phthalate onto (a) steel slag (black line), gravel (red line), and (b) shell sand at 25°C at an initial dibutyl phthalate concentration of 5 mg/L (error bars represent the standard deviation of three replicates).
Adsorbents Pseudo-first-order kinetic model Pseudo-second-order kinetic model Elovich kinetic model
qe
(mg/kg)
k1
(h-1)
R2 qe
(mg/kg)
k2
(g/mg/h)
R2 a b R2
Steel slag 104 0.0309 0.997 136 2.08 × 10-4 0.991 10.2 0.0371 0.972
Gravel 91.5 0.0599 0.923 106 6.89 × 10-4 0.964 22.3 0.0499 0.970
Shell sand 3.59 0.0439 0.880 4.18 0.0135 0.931 0.748 1.29 0.953
Tab.2  Kinetics parameters of dibutyl phthalate adsorption onto steel slag, gravel, and shell sand
Fig.4  Adsorption isotherms of dibutyl phthalate onto steel slag (black line) and gravel (red line) at (a) 10°C, (b) 25°C, and (c) 40°C. (d) The adsorption of dibutyl phthalate onto shell sand at 10°C (black line), 25°C (red line), and 40°C (blue line). The contact time was 120 h (error bars represent the standard deviation of three replicates).
Temperature (°C) Adsorbents Langmuir isotherm Freundlich isotherm
qm
(mg/kg)
KL
(mg/L)
R2 KF
(mg/kg)
n R2
10 Steel slag 131 8.42 0.890 108 -0.160 0.743
Gravel 132 5.08 0.833 99.6 -0.212 0.658
Shell sand 4.89 5.64 0.827 3.83 -0.221 0.913
25 Steel slag 656 1.79 0.947 354 -0.229 0.939
Gravel 598 0.838 0.940 276 -0.246 0.855
Shell sand 6.61 10.9 0.928 5.60 -0.202 0.954
40 Steel slag 1871 2.75 0.891 1220 -0.193 0.821
Gravel 1416 3.87 0.945 1015 -0.151 0.870
Shell sand 8.14 8.82 0.962 6.39 -0.229 0.932
Tab.3  Isotherm parameters of dibutyl phthalate adsorption onto steel slag, gravel, and shell sand
Adsorbents PAEs Temperature (°C) pH qm (mg/g) Source
Coal-chitosan DEP 25 5.8 31.7 Shaida et al. (2018)
Mollisol DBP 25 7.0 0.757 Lin et al. (2018)
Rhizosphere soil DBP 25 2.04
Montmorillonite DBP 30 7.0 13.8 Lu et al. (2016)
Goethite 12.6
Kaolinite 5.09
Vermiculite DEHP 25 7.0 0.714 Wen et al. (2013)
Natural zeolites DMP 30 6.36 3.30 Xu et al. (2016)
DEHP 3.4
Mg–Al layered double hydroxide DMP 25 7.0 4.21 Wang et al. (2012)
DEHP 4.80
DOP 5.20
Steel slag DBP 25 7.2 0.656 This work
Gravel 0.598
Shell sand 0.006
Tab.4  Comparison of the adsorbents used in this study with other adsorbents reported for the removal of PAEs
Fig.5  The effects of humic acid on removal efficiencies of dibutyl phthalate onto steel slag (a) and gravel (b) (error bars represent the standard deviation of three replicates).
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