机械力化学法降解十二烷基苯磺酸钠

doi:10.3969/j.issn.1001-1803.2021.09.006

Abstract

Abstract:

Sodium dodecyl benzene sulfonate （SDBS） is a widely used anionic surfactant in many industrial fields such as printing, washing, textile and building materials. The use of SDBS generates a lot of bubbles to reduce the oxygenation in water, which causes some negative effects and requires degradation treatment. Mechanochemical method is environmentally friendly and efficient for treatment of organic pollutants, which is widely used in soil remediation. At present, the ball milling method is mainly applied to the degradation of halogenated organics. The research on the treatment of surfactants has rarely been reported. In this work, the degradation properties of SDBS which was ball milled with La₂O₃ and magnetic recyclable Fe₃O₄ were investigated. Then the degradation of SDBS by the same method was explored in the soil. The chemical structure and properties of SDBS and the degradation products thereof were characterized by FTIR, UV-vis and LC-MS to find out the best experimental parameters. The results show that the best degradation rates of La₂O₃ and Fe₃O₄ to SDBS are 93.89% and 85.56%, respectively. The best experimental parameters are as follows: the mass ratio of additives to SDBS is 19:1, the mass ratio of ball to material is 40:1, the ball grinding speed is 500 r/min, and the ball grinding time is 4 h. When the additive is La₂O₃, 100% Φ 5 mm ball milling beads are used, and when the additive is Fe₃O₄, 20% Φ 10 mm, 60% Φ 5 mm and 20% Φ 2 mm ball milling beads are used. In the soil, the degradation rates of SDBS by La₂O₃ and Fe₃O₄ are 75.35% and 34.88%, respectively. Through UV and IR analysis, it is found that the benzene ring structure is destroyed and -SO₃- is oxidized, both indicating that SDBS has been degraded by ball milling treatment. LC-MS analysis shows that the molecular ion peaks of SDBS become weaker and many ion peaks of small organic molecules appear after ball milling, which also demonstrates that SDBS has been degraded by ball milling.

Key words: SDBS, mechanochemistry, external additive, degradation

CLC Number:

TQ423

Zhao Qingqing,Chen Hongling. Degradation of sodium dodecyl benzene sulfonate by mechanochemical method[J].China Surfactant Detergent & Cosmetics, 2021, 51(9): 844-851.

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References 18

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物料质量比	SDBS质量/g	外源添加剂质量/g
5.06:1	0.33	1.67
10.11:1	0.18	1.82
15.66:1	0.12	1.88
19:1	0.10	1.90
24:1	0.08	1.92
32.33:1	0.06	1.94

Degradation of sodium dodecyl benzene sulfonate by mechanochemical method

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球料比	Fe₃O₄添加剂用不同尺寸磨珠质量/g			La₂O₃添加剂用磨珠质量/g
球料比	Φ 10 mm	Φ 5 mm	Φ 2 mm	Φ 5 mm
20:1	4	12	4	20
30:1	4	20	6	30
40:1	8	24	8	40
50:1	8	32	10	50
60:1	12	36	12	60

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实验编号	Φ 10 mm磨珠质量/g	Φ 5 mm磨珠质量/g	Φ 2 mm磨珠质量/g
1	40	0	0
2	0	40	0
3	20	20	0
4	16	16	8
5	0	20	20
6	8	24	8
7	0	30	10