Dye adsorption by self-recoverable, adjustable amphiphilic graphene aerogel
Dye adsorption by self-recoverable, adjustable amphiphilic graphene aerogel
复制标题
可自恢复、可调节的两亲性石墨烯气凝胶吸附染料
DOI：
10.1016/j.jcis.2019.07.041
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发表时间：
2019
影响因子：
9.9
通讯作者：
Peng Yinxian
中科院分区：
文献类型：
--
作者：
Tang Sheng;Xia Dasha;Yao Yao;Chen Tianyu;Sun Jun;Yin Yijie;Shen Wei;Peng Yinxian
制备了一种可自恢复、可调节的两亲性石墨烯气凝胶（GA）并将其应用于染料吸附。以聚乙烯醇（PVA）为交联剂的GA具有可调节两亲性的特点。通过调节GA中PVA的含量，后者可用于吸附不同疏水性和亲水性的染料。以四种染料（孔雀石绿、罗丹明B、亚甲蓝和甲基橙）为目标，计算饱和吸附量。采用Langmuir吸附模型和Lagrange伪二阶方程数学模型研究了GA对染料的吸附行为，实验数据与数学模型完全吻合。优异的机械性能（可压缩性和可恢复性）使GA适合染料吸附。还进行了计算模拟来验证 GA 对染料的吸附能。在 10 个应用周期后，GA 能够保留 89.5% 的初始去除效率（对于孔雀石绿）。
A type of self-recoverable, adjustable amphiphilic graphene aerogel (GA) was prepared and applied to the dye adsorption. The GA with polyvinyl alcohol (PVA) as its cross-linking agent has the characteristics of adjustable amphiphilicity. By adjusting the PVA content in GA, the later can be used to adsorb dyes with different hydrophobic and hydrophilic properties. Four kinds of dyes (Malachite green, Rhodamine B, Methylene blue and Methyl orange) were applied as targets and the saturated adsorption amounts were calculated. The Langmuir adsorption model and the Lagrange pseudo-second-order equation mathematical model were used to study the behavior of dye adsorption by GA, and the experimental data was in full compliance with the mathematical models. The excellent mechanical properties (compressibility and recoverability) make the GA suitable for dye adsorption. A computational simulation was also performed to verify the adsorption energy of GA to dyes. The GA was able to retain 89.5% of its initial removal efficiency (for malachite green) after 10 cycles of application.