Removal Performance and Mechanism of Selenite with the Highly Active Ferrous Hydroxyl Complex FHC(Cl-)†

doi:10.7503/cjcu20160772

Abstract

Abstract:

The highly active ferrous hydroxyl complex[FHC(Cl^-)] was synthesized by slow titration. The dynamics of Se(Ⅳ) removal by FHC(Cl^-) was investigated, where the impact factors of FHC(Cl^-) dosage, pH, oxygen and sodium chloride concentration were studied with response surface analysis method. The results demonstrated that the apparent rate constant(k_obs) was 0.60 min^-1, which was 4 times as great as that of Nano Zero-Valent Iron and 16 times that of Zero-Valent Iron. In addition, the response value of quadratic multinomial regression equation(designed by Box-Benhnken) for coding the independent variables was Y(c/c₀)=0.14-0.20A+0.017B-0.27C-0.019D-0.047AB-0.095AC+0.13AD-0.010BC-0.082BD+0.33A²+0.023B²+0.097C²+0.065D². The optimum reaction conditions were FHC(Cl^-) dosage 98 mg/L, pH=7.5, the concentration of NaCl 1 mmol/L and closed system. The results of XPS indicated that Se(Ⅳ) was eventually reduced to Se(0) or Se(Ⅱ) by FHC(Cl^-).

Key words: Reaction kinetics, High-reactivity, Reduction, Response surface method(RSM), X-ray photoelectron spectroscopy(XPS)

CLC Number:

O641
O613.52

TrendMD:

ZHANG Yong, FU Mao, WU Deli, ZHANG Yalei. Removal Performance and Mechanism of Selenite with the Highly Active Ferrous Hydroxyl Complex FHC(Cl^-)^†[J]. Chem. J. Chinese Universities, 2017, 38(5): 830.

Figures/Tables 12

References 25

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Level	Dosage/(mg·L^-1)	O₂	pH	c(NaCl)/(mmol·L^-1)
1	56.0	Aerobic	5.5	0
2	98.0	Closed	7.5	1
3	140.0	Anaerobic	9.5	2

Level	Dosage/(mg·L^-1)	O₂	pH	c(NaCl)/(mmol·L^-1)
1	56.0	Aerobic	5.5	0
2	98.0	Closed	7.5	1
3	140.0	Anaerobic	9.5	2

pH	c(NaCl)/ (mmol·L^-1)	Dosage/ (mg·L^-1)	O₂	c/c₀	pH	c(NaCl)/ (mmol·L^-1)	Dosage/ (mg·L^-1)	O₂	c/c₀
7.5	2	98.0	Aerobic	0.08	7.5	0	98.0	Aerobic	0.11
7.5	1	98.0	Closed	0.14	5.5	1	98.0	Aerobic	0.66
5.5	1	140.0	Closed	0.52	9.5	0	98.0	Closed	0.38
5.5	1	56.0	Closed	0.88	7.5	2	140.0	Closed	0.02
7.5	1	140.0	Aerobic	0.08	5.5	0	98.0	Closed	0.71
7.5	1	98.0	Closed	0.14	7.5	1	98.0	Closed	0.14
7.5	1	56.0	Aerobic	0.59	7.5	1	98.0	Closed	0.14
7.5	0	98.0	Anaerobic	0.17	9.5	1	98.0	Anaerobic	0.14
9.5	2	98.0	Closed	0.22	7.5	0	56.0	Closed	0.48
7.5	1	98.0	Closed	0.14	5.5	1	98.0	Anaerobic	0.84
7.5	1	140.0	Anaerobic	0.01	7.5	2	56.0	Closed	0.53
7.5	0	140.0	Closed	0.01	5.5	2	98.0	Closed	0.74
9.5	1	140.0	Closed	0.02	9.5	1	98.0	Aerobic	0.49
9.5	1	56.0	Closed	0.76	7.5	2	98.0	Anaerobic	0.47
7.5	1	56.0	Anaerobic	0.61

pH	c(NaCl)/ (mmol·L^-1)	Dosage/ (mg·L^-1)	O₂	c/c₀	pH	c(NaCl)/ (mmol·L^-1)	Dosage/ (mg·L^-1)	O₂	c/c₀
7.5	2	98.0	Aerobic	0.08	7.5	0	98.0	Aerobic	0.11
7.5	1	98.0	Closed	0.14	5.5	1	98.0	Aerobic	0.66
5.5	1	140.0	Closed	0.52	9.5	0	98.0	Closed	0.38
5.5	1	56.0	Closed	0.88	7.5	2	140.0	Closed	0.02
7.5	1	140.0	Aerobic	0.08	5.5	0	98.0	Closed	0.71
7.5	1	98.0	Closed	0.14	7.5	1	98.0	Closed	0.14
7.5	1	56.0	Aerobic	0.59	7.5	1	98.0	Closed	0.14
7.5	0	98.0	Anaerobic	0.17	9.5	1	98.0	Anaerobic	0.14
9.5	2	98.0	Closed	0.22	7.5	0	56.0	Closed	0.48
7.5	1	98.0	Closed	0.14	5.5	1	98.0	Anaerobic	0.84
7.5	1	140.0	Anaerobic	0.01	7.5	2	56.0	Closed	0.53
7.5	0	140.0	Closed	0.01	5.5	2	98.0	Closed	0.74
9.5	1	140.0	Closed	0.02	9.5	1	98.0	Aerobic	0.49
9.5	1	56.0	Closed	0.76	7.5	2	98.0	Anaerobic	0.47
7.5	1	56.0	Anaerobic	0.61

Soruces of variation	Quadratic sum	Degree of freedom	F	Level of significance, P
Model	2.18	14	23.38	<0.0001
A-pH	0.46	1	68.57	<0.0001
B-c(NaCl)	0.003	1	0.50	0.4907
C-dosage	0.85	1	127.44	<0.0001
D-DO	0.004	1	0.66	0.4293
AB	0.009	1	1.36	0.2636
AC	0.04	1	5.43	0.0353
AD	0.07	1	10.55	0.0058
BC	0.0004	1	0.06	0.8099
BD	0.03	1	4.09	0.0626
CD	0.002	1	0.30	0.5899
A²	0.69	1	105.09	<0.0001
B²	0.004	1	0.53	0.4783
C²	0.06	1	9.18	0.0090
D²	0.03	1	4.07	0.0634
Residual error	0.09	14	0.007
Lack of fit	0.09	10	0.09
Pure error	0	4	0
Sum	2.27	28