Abstract Ultrafast and facile microwave hydrothermal approach was applied to synthesize gallotannin modified carbon nanotube composites (CNT-GT) for effective recovery of Ga(III) from aqueous solutions. The successful preparation of CNT-GT composites was ascertained by a series of characterization techniques including TEM, FTIR, TGA, BET, Raman, XPS and Boehm titration. The CNT-GT obviously enhanced Ga(III) adsorption capability (170.8 mg g−1) as compared with the unmodified carboxylic carbon nanotubes (CNT-COOH). The CNT-GT composites had superior selectivity and excellent reusability. The adsorption mechanism of CNT-GT is based on the ion exchange of the surface hydroxyl hydrogen of CNT-GT with Ga(OH)2+, Ga(OH)2+, or Ga3+. In a word, the method described in this paper should be a quick and simple way to prepare highly efficient adsorbents, which has definite significance for the application of the environment.

中文翻译：

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镓单宁/碳纳米管复合材料的微波水热合成回收镓离子

摘要 采用超快、简便的微波水热法合成了棓单宁改性碳纳米管复合材料（CNT-GT），以有效地从水溶液中回收Ga（III）。CNT-GT 复合材料的成功制备是通过一系列表征技术确定的，包括 TEM、FTIR、TGA、BET、拉曼、XPS 和 Boehm 滴定。与未改性的羧基碳纳米管 (CNT-COOH) 相比，CNT-GT 明显增强了 Ga(III) 吸附能力（170.8 mg g-1）。CNT-GT 复合材料具有优异的选择性和优异的可重复使用性。CNT-GT 的吸附机理是基于 CNT-GT 表面羟基氢与 Ga(OH)2+、Ga(OH)2+ 或 Ga3+ 的离子交换。总之，本文描述的方法应该是一种快速简单的制备高效吸附剂的方法，