The 3D porous CQDs/LDHs have been synthesized using CQDs as structure-directing agent to adsorb boron(III) from aqueous solution. Characteristic results showed that the prepared CQDs/LDHs have high adsorption capacity and selectivity. FTIR and XPS spectra revealed that CQDs/LDHs possessed more oxygen-containing groups than LDHs. BET data revealed that CQDs/LDHs had a specific surface area of 186 m²/g, which is twice larger than LDHs of 91.6 m²/g. Effects of the temperature, pH and boron(III) concentration on adsorption performance of boron(III) were investigated. The results showed that the maximum adsorption capacity of 19.5 mg/g on CQDs/LDHs was obtained when the initial boron(III) concentration is 20 mg/L at pH 8.5. In the competitive adsorption system, the removal rate of CQDs/LDHs toward boron(III) can reach to 89.7%, which is three times bigger than raw LDHs. Adsorption isotherm and kinetics studies revealed that boron(III) adsorption process was well-described by Langmuir isotherm and pseudo-second-order kinetic model, respectively. Adsorption and characterization data proved that the adsorption mechanism of boron(III) is a complex process, including anion exchange and oxygen-containing group adsorption. This work not only gives a new way to synthesize 3D porous material but also provides a potential material to selectively adsorp boron(III).

3D多孔CQDs / LDHs是使用CQDs作为结构导向剂从水溶液中吸附硼（III）合成的。表征结果表明，所制备的CQDs / LDHs具有较高的吸附能力和选择性。FTIR和XPS光谱显示CQDs / LDHs比LDHs具有更多的含氧基团。BET数据显示CQDs / LDHs的比表面积为186 m ² / g，比LDHs的91.6 m ²大两倍。/G。研究了温度，pH和硼（III）浓度对硼（III）吸附性能的影响。结果表明，当初始硼（III）浓度为20 mg / L，pH 8.5时，CQDs / LDHs的最大吸附容量为19.5 mg / g。在竞争性吸附系统中，CQDs / LDHs对硼（III）的去除率可达到89.7％，是原始LDHs的三倍。吸附等温线和动力学研究表明，Langmuir等温线和伪二级动力学模型分别很好地描述了硼（III）的吸附过程。吸附和表征数据证明，硼（III）的吸附机理是一个复杂的过程，包括阴离子交换和含氧基团的吸附。