氨基醇改性GO/CNTs复合气凝胶的制备及对盐湖卤水硼的吸附

doi:10.19964/j.issn.1006-4990.2022-0703

Abstract

Abstract:

The separation and extraction of low concentration boron from salt lake brine can not only improve the comprehensive utilization rate of resources，but also solve the problem of boron impurity interference in the downstream products of salt lake.Graphene oxide/carbon nanotube（GO/CNTs） composite aerogel was synthesized by hydrothermal method.Polyhydroxy 2-amino-1，3-propanediol was grafted onto the surface of the aerogel by epoxy ring-opening reaction to obtain amino alcohol modified graphene oxide/carbon nanotubes（GO/CNTs） aerogel gel boron adsorbent.The effects of pH，initial concentration，temperature and contact time on boron adsorption were studied by FT-IR，XPS and SEM.It was found that the adsorbent was a porous structure with abundant polyol groups in the channel and on the surface.The results also showed that the maximum equilibrium adsorption capacity of boron was 43.42 mg/g at pH=10，C_o=1 200 mg/L.The adsorption performance of boron was the best at 35 ℃ and reached saturated adsorption equilibrium within 60 min.The adsorption process was accorded with quasi-second-order kinetic model.The adsorption mechanism was the chemical complexation between boron and polyhydroxyl groups.According to the research，the adsorbent showed good application value and potential in the separation of boron in brine.

Key words: boron adsorbent, graphene oxide, carbon nanotube, brine, composite aerogel, amino alcohol modification

CLC Number:

TQ127.1

CUI Xiangmei, PAN Tongtong, LUO Qinglong, BIAN Fuxuan, YE Xiushen. Preparation of amino alcohol modified GO/CNTs composite aerogel and boron adsorption from salt lake brines[J]. Inorganic Chemicals Industry, 2023, 55(12): 59-65.

Figures/Tables 15

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Table 1

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吸附剂	功能基团	Q/ （mg∙g^-1）	T_e/ min	溶剂
Amberlit IRA743^［26］	葡甲胺	7.46	60	—
CTS-MG^［27］	葡甲胺	35.13	720	DMF、THF
PAN-g-PG^［28］	缩水甘油	34.59	10	H₂O、乙醇
CA-KH-550-EPH^［29］	葡甲胺	15.35	600	DMF
PAN-PGMA^［30］	葡甲胺	5.5	100	DMF、THF
Si-MG^［31］	葡甲胺	16.65	120	DMF、甲苯
GMA-MMA-DVB-MG^［32］	葡甲胺	9.03	60	甲苯
GMA-MMA-DVB-PG ^［33］	缩水甘油	32.43	80	N-甲基吡咯烷酮
CTS-MG^［25］	葡甲胺	20.4	400	异丙醇
P（GMA-co-TRIM）-MG^［34］	葡甲胺	19.89	60	DMF、甲苯
GO/CNTs-OH（本工作）	—OH	43.42	60	H₂O

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Preparation of amino alcohol modified GO/CNTs composite aerogel and boron adsorption from salt lake brines

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