<trans-title>Adsorption of Phosphonate Antiscalant HEDP from Reverse Osmosis Concentrates by La/FeOOH@PAC</trans-title>

Chuang LI; Qingfeng YANG; Shengsen LU; Yangqiao LIU

doi:10.15541/jim20200512

Journal of Inorganic Materials, Volume. 36, Issue 8, 841(2021)

Adsorption of Phosphonate Antiscalant HEDP from Reverse Osmosis Concentrates by La/FeOOH@PAC

Chuang LI1...2, Qingfeng YANG1,*, Shengsen LU1 and Yangqiao LIU3,* |Show fewer author(s)

Author Affiliations

¹1. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China

²2. University of Chinese Academy of Sciences, Beijing 100049, China

³3. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

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Figures & Tables(12)

1. Variation of HEDP adsorption capacity on La/FeOOH@PAC with different molar ratios of the La/Fe

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2. XRD patterns of PAC and La/FeOOH@PAC

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3. Different magnification FE-SEM images of La/FeOOH@PAC composite

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4. Adsorption kinetics of HEDP onto the adsorbent

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5. Adsorption isotherm of HEDP onto the adsorbent

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6. Linear plots fit of lnK_dversus C_efor the adsorption HEDP onto the adsorbent at different temperatures (a); linear plots of lnK₀versus 1/T for the adsorption of HEDP onto the adsorbent (b)

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7. Wide scan (a), P2p (b) and O1s (c, d) XPS spectra of the adsorbent before and after adsorption

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Table 1. Simulation solution of RO concentrates
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Table 1. Simulation solution of RO concentrates
Concentration/(mg·L^-1) T/K Initial pH
HEDP Ca²⁺ Mg²⁺ Na⁺ Cl^- SO₄^2- HCO^-
18.00 298 8.00 204.54 397.86 407.62 542.46 298 8.00

Table 2. Elemental composition of the adsorbent
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Table 2. Elemental composition of the adsorbent
Element C O Fe La
wt% 86.27 12.04 1.05 0.64

Table 3. Parameters of kinetic models for HEDP adsorption onto the La/FeOOH@PAC composite

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Table 3. Parameters of kinetic models for HEDP adsorption onto the La/FeOOH@PAC composite

T/K	Q_e,exp/(mg·g^-1)	Pseudo-first-order equation			Pseudo-second-order equation
T/K	Q_e,exp/(mg·g^-1)	k₁/h^-1	Q_e/(mg·g^-1)	R²	k₂/(g·mg^-1·h^-1)	Q_e/(mg·g^-1)	R²
298	41.600	0.476	24.143	0.983	0.0659	42.553	0.999

Table 4. Parameters of isotherm models for HEDP adsorption onto the adsorbent

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Table 4. Parameters of isotherm models for HEDP adsorption onto the adsorbent

T/K	Langmuir model parameters			Freundlich model parameters
T/K	Q_m/ (mg·g^-1)	K_L/ (L·mg^-1)	R²	n	K_F	R²
298	65.359	0.455	0.974	1.880	19.249	0.864
308	56.818	0.674	0.992	2.446	21.509	0.949
318	56.689	0.512	0.993	2.211	18.571	0.940

Table 5. Thermodynamic parameters for HEDP adsorption onto the adsorbent
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Table 5. Thermodynamic parameters for HEDP adsorption onto the adsorbent
T/K ΔG^o/(kJ·mol^-1) ΔH^o/(kJ·mol^-1) ΔS^o/(J·mol^-1 K^-1)
298 -7.579 -9.632 -6.834
308 -7.567
318 -7.440

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Chuang LI, Qingfeng YANG, Shengsen LU, Yangqiao LIU. Adsorption of Phosphonate Antiscalant HEDP from Reverse Osmosis Concentrates by La/FeOOH@PAC[J]. Journal of Inorganic Materials, 2021, 36(8): 841

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