Sorption Behaviors and Mechanisms of Eu(III) on Rice Straw-derived Biochar

Lijia DONG; Siying WU; Shengbo LI; Zuofu WEI; Guo YANG; Baowei HU

doi:10.15541/jim20190314

Journals >Journal of Inorganic Materials >Volume 35 >Issue 3 >Page 390 > Article

Journal of Inorganic Materials
Vol. 35, Issue 3, 390 (2020)

Sorption Behaviors and Mechanisms of Eu(III) on Rice Straw-derived Biochar

Lijia DONG¹, Siying WU¹, Shengbo LI¹, Zuofu WEI², Guo YANG¹, and Baowei HU^1、*

Author Affiliations

¹School of Life Science, Shaoxing University, Shaoxing 312000, China

²School of Life Science, Shanxi Normal University, Linfen 041004, China

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DOI: 10.15541/jim20190314 Cite this Article

Lijia DONG, Siying WU, Shengbo LI, Zuofu WEI, Guo YANG, Baowei HU. Sorption Behaviors and Mechanisms of Eu(III) on Rice Straw-derived Biochar[J]. Journal of Inorganic Materials, 2020, 35(3): 390 Copy Citation Text

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. SEM image (a), TEM image (b), and FT-IR spectrum (c) of rice straw-derived biochar

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. Influence of ionic strength on Eu(III) sorption on biochar as a function of pH(a), and the relative distribution of Eu(III) species in solutions as a function of pH(b)

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. Effect of HA/FA addition on Eu(III) sorption onto biochar under the conditions of T=(298±2) K, C_{Eu(III)initial}= 10.0 mg/L, m/V=0.45 g/L, C_NaClO4=0.01 mol/L

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. Eu(III) sorption percentage on biochar as a function of contact time and pH (a), 3D plots of t/q_tvs. t for pseudo-second-order model simulation (b), and q_tvs. t^1/2 for intra-particle diffusion model simulation at 4 pH (c)

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. Isotherms of Eu(III) sorption onto biochar at different temperatures under the conditions of pH=5.5±0.2, C_NaClO4= 0.01 mol/L, m/V=0.45 g/L

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. Linearized Langmuir isotherm (a), Freundlich isotherm(b), Temkin isotherm (c), Dubinin-Radushkevich isotherm (d) of Eu(III) sorption on biochar at different temperatures (pH=5.5±0.2, C_NaClO4=0.01 mol/L, m/V=0.45 g/L)

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. Linear relationships of lnK_dvs. C_e for Eu(III) sorption on biochar at different temperatures (a) and lnK^θ vs. 1/T (b). (pH= 5.5±0.2, C_NaClO4=0.01 mol/L, m/V=0.45 g/L)

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pH	Pseudo-second-order model			Intra-particle diffusion model
pH	q_e/(mol∙g^-1)	K/(g∙mol^-1∙h^-1)	r²	k_int/(mg∙g^-1∙h^-1/2)	r²
5.26	1.265 × 10^-4	5.361 × 10⁴	1.000	2.147	0.829
5.98	1.073 × 10^-4	3.503 × 10⁴	1.000	1.589	0.764
6.57	9.911 × 10^-5	3.253 × 10⁴	1.000	1.513	0.749
7.22	8.591 × 10^-5	1.756 × 10⁴	0.999	1.630	0.650

Table 1.

Parameters of Eu(III) sorption kinetic on rice straw-derived biochar with 4 pH of solutions

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T/K	Langmuir model
T/K	q_max/(mg∙g^-1)	K_L/(L∙mg^-1)	r²
298	34.626	0.130	0.950
318	31.289	0.322	0.974
338	40.717	0.336	0.984
	Freundlich model
	K_F/(mg^1-ⁿ∙Lⁿ∙g^-1)	n	r²
298	4.091	0.738	0.988
318	7.723	0.548	0.992
338	10.280	0.561	0.974
	Temkin model
	A	b	r²
298	1.875	401.551	0.957
318	3.342	374.482	0.970
338	3.217	304.874	0.978
	Dubinin-Radushkevich model
	q_max/(mg∙g^-1)	E/(J∙g^-1)	r²
298	13.518	0.502	0.824
318	18.320	0.609	0.873
338	22.920	0.617	0.801

Table 2.

Parameters for Eu(III) sorption isotherms onto rice straw-derived biochar at different temperatures

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T/K	ΔG^θ/(kJ∙mg^-1)	ΔS^θ/(J∙mg^-1∙K^-1)	ΔH^θ/(kJ∙mg^-1)
298	-20.708	142.169	21.659
318	-24.059	142.169	21.151
338	-26.351	142.169	21.703

Table 3.

Thermodynamic parameters for Eu(III) sorption on rice straw-derived biochar at different temperatures

Lijia DONG, Siying WU, Shengbo LI, Zuofu WEI, Guo YANG, Baowei HU. Sorption Behaviors and Mechanisms of Eu(III) on Rice Straw-derived Biochar[J]. Journal of Inorganic Materials, 2020, 35(3): 390

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