This study explored the possibility of recovering waste powder from photonic industry into two useful resources, sodium fluoride (NaF) and the silica precursor solution. An alkali fusion process was utilized to effectively separate silicate supernatant and the sediment. The obtained sediment contains purified NaF (>90%), which provides further reuse possibility since NaF is widely applied in chemical industry. The supernatant is a valuable silicate source for synthesizing mesoporous silica material such as MCM-41. The MCM-41 produced from the photonic waste powder (PWP), namely MCM-41(PWP), possessed high specific surface areas (1082m 2 /g), narrow pore size distributions (2.95nm) and large pore volumes (0.99cm 3 /g). The amine-modified MCM-41(PWP) was further applied as an adsorbent for the capture of CO 2 greenhouse gas. Breakthrough experiments demonstrated that the tetraethylenepentamine (TEPA) functionalized MCM-41(PWP) exhibited an adsorption capacity (82mg CO 2 /g adsorbent) of only slightly less than that of the TEPA/MCM-41 manufactured from pure chemical (97mg CO 2 /g adsorbent), and its capacity is higher than that of TEPA/ZSM-5 zeolite (43mg CO 2 /g adsorbent). The results revealed both the high potential of resource recovery from the photonic solid waste and the cost-effective application of waste-derived mesoporous adsorbent for environmental protection.
- CO2 adsorbent
- Mesoporous silica materials
- Photonic industrial waste powder
- Resource recovery