Newly developed adsorbents, poly(tannin-hexamethylendiamine) (PTHA), were fabricated by varying the mole ratio of tannin (TA) and hexamethylendiamine (HA) under one-pot reaction. The specific forming process of the adsorbent which had undergone the transition from hydrogen bonds to covalent bonds was subsequently explored. Based on the efficiency of Cr(VI) removal from aqueous solution over all prepared adsorbents, the PTHA-4 (mole ratio of TA/HA = 1:12.5) exhibited an excellent adsorption behavior. Adsorption experiments affected by contact time and ionic strength have been conducted successively by PTHA-4, and the equilibrium was reached at 24 h. The kinetic data revealed that the adsorption was good agreement with pseudo-second order model and needed to undergo the rate-controlling step. The maximum adsorption capacity was 283.29 mg/g at 30°C, relying on the isothermal curve suitably described by Langmuir model. Furthermore, toxic Cr(VI) had been reduced to the low toxic Cr(III) during adsorption process. The structures and adsorption performance of adsorbent were confirmed by means of SEM, FT-IR, XPS etc. Thus, the cheap-sustainable adsorbents have a superior feature for Cr(VI)-wastewater purification in future.

通过在单锅反应下改变单宁（TA）和六甲基己二胺（HA）的摩尔比来制备新开发的吸附剂聚（单宁-六甲基己二胺）（PTHA）。随后探讨了吸附剂从氢键过渡到共价键的具体形成过程。基于所有制备的吸附剂上从水溶液中去除Cr（VI）的效率，PTHA-4（TA / HA的摩尔比= 1：12.5）表现出优异的吸附性能。PTHA-4连续进行了受接触时间和离子强度影响的吸附实验，并在24 h达到平衡。动力学数据表明，吸附与拟二阶模型吻合良好，需要进行速率控制。在30°C下的最大吸附容量为283.29 mg / g，依赖于Langmuir模型适当描述的等温曲线。此外，在吸附过程中，有毒的Cr（VI）已还原为低毒的Cr（III）。通过SEM，FT-IR，XPS等方法确定了吸附剂的结构和吸附性能。等。因此，廉价可持续的吸附剂在未来的Cr（VI）-废水净化中具有优越的功能。