Preparation of areca residue activated carbon composite and its adsorption performance for uranium (VI) in wastewater
Preparation of areca residue activated carbon composite and its adsorption performance for uranium (VI) in wastewater
复制标题
槟榔渣活性炭复合材料的制备及其对废水中铀（VI）的吸附性能
DOI：
10.5004/dwt.2020.25136
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发表时间：
2020
影响因子：
1.1
通讯作者：
Yu Qing
中科院分区：
文献类型：
--
作者：
Wu Ling-ling;Cao Yan-sen;Li Zhao-peng;Hu Lin;Zhang Zhi-jun;Yu Qing
本文以槟榔渣为原料，采用微波法制备炭。以木质活性炭的碘吸附值为主要指标，通过静态吸附实验，考察了不同铀液pH值、不同铀液初始浓度、槟榔渣炭投加量、吸附时间等条件下，木质活性炭对铀的吸附能力。在此基础上，分析了微波辐射时间、活化剂浓度和活化剂浸泡时间对活性碳生产过程的影响。用扫描电子显微镜-能谱仪(SEM-EDS)和傅里叶变换红外光谱(FTIR)研究了槟榔渣吸附处理前后制备的活性碳的结构。结果表明，以槟榔渣为原料制备的活性炭，当活化剂浓度为20%、活化时间为36h、微波功率为700W、时间为2min时，吸附效果最佳。结果表明，当pH值为7，槟榔渣活性炭用量为8g/L，吸附时间为7h时，溶液中铀的脱除率最高，为92.8%，动力学数据符合准二级动力学模型。制备的活性碳表面的羟基、羰基、羧基和C=C基团对铀的吸附起主要作用。脱附和再生过程表明，槟榔渣制备的活性碳材料具有再生和再利用的潜力。
In this paper, areca residue was used as a new material to prepare activated carbon by microwave. With the iodine adsorption value of wood activated carbon as the main index, the adsorption capacity of activated carbon to uranium was investigated by static adsorption experiment with the different pH value of uranium solution, initial concentration of uranium solution, dosage of areca residue activated carbon and adsorption time. On this basis, the impact of microwave irradiation time, activator concentration and activator immersion time on the production process of activated carbon was analyzed. The structure of the prepared activated carbon from areca residue before and after adsorption treatment was explored by scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and Fourier transform infrared spectroscopy. The results showed that the activated carbon prepared by areca residue had the best adsorption effect when the concentration of activator with NaOH was 20%, the soaking time of activator was 36 h, and the microwave irradiation time with power of 700 W was 2 min. It is found that the best percentage removal of uranium from solution was 92.8% under pH value of 7, the dosage of areca residue activated carbon of 8 g/L and the adsorption time of 7 h. The kinetic data followed the pseudo-second-order model. The hydroxyl, carbonyl, carboxyl and C=C groups on the surface of the prepared activated carbon were responsible for adsorption of uranium. Desorption and regeneration processes showed that the activated carbon material prepared by areca residue had the potential of regeneration and reuse.