Adsorption efficiency of ordered mesoporous carboxyl-functionalized tube bundles in functional wood toward heavy metal ions: Optimization, performance and chemiluminescence reuse after adsorption

Abstract

Design a novel and efficient adsorption-reutilization system is required urgently to overcome the difficulty of heavy metal-polluted water and secondary pollution of adsorbent-heavy metals. Here, a functional imitation wood-derived adsorbent was fabricated with carboxyl-functionalized ordered mesoporous tube bundles (named as OMTB@CA-IWA), which was successfully used in the high efficiency removal of heavy metal and then reused in chemiluminescence after adsorption. Experimental results indicated that high-density carboxyl groups were grafted onto the ordered mesoporous tube bundles of the delignified parasol via chemical modification, resulting in an efficient adsorption toward various heavy metal from wastewater. More importantly, the adsorbed spent adsorbent (M2+@OMTB@CA-IWA) was reused for the first time to act as heterogeneous catalytic cites for the chemiluminescence via an ingenious strategy in the system of N-(4-aminobutyl)-N-ethylisoluminol (ABEI) and H2O2. The prepared chemiluminescence system presented high intensity (1.42 ×106 a.u.) and long duration time (over 10 h), which avoids the traditional secondary pollution and waste reprocessing. In view of the low price, easy availability and renewable of raw materials, the simple facile fabrication process, and the high efficiency of adsorbent as well as the interesting strategy for successive application in adsorption and chemiluminescence, the OMTB@CA-IWA will potentially bring about high speed development and widespread applications in wastewater treatment, biological imaging and cold light sources.