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

Chuang LI; Qingfeng YANG; Shengsen LU; Yangqiao LIU

doi:10.15541/jim20200512

Journals >Journal of Inorganic Materials >Volume 36 >Issue 8 >Page 841 > Article

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

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

Chuang LI^1、2, Qingfeng YANG^1、*, Shengsen LU¹, and Yangqiao LIU^3、*

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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DOI: 10.15541/jim20200512 Cite this Article

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 Copy Citation Text

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

Table 1. Simulation solution of RO concentrates

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Element	C	O	Fe	La
wt%	86.27	12.04	1.05	0.64

Table 2. Elemental composition of the adsorbent

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

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

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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

Table 5. Thermodynamic parameters for HEDP adsorption onto the adsorbent

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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