Journal
MINERALS
Volume 11, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/min11121371
Keywords
expanded vermiculite; absorbent; hazard spillage; H2O2 treatment; microwave oven
Funding
- GRRC program of Gyeonggi Province [GRRC-HY2021-B04]
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Research shows that two-step expanded eVMT has a higher pore volume compared to conventional thermal methods, significantly improving its liquid uptake performance for hazardous substances. Through physical absorption and capillary action, two-step eVMT successfully mitigates liquid hazards on impermeable surfaces.
Expanded vermiculite (eVMT) has been studied as a risk-free, general-purpose absorbent for liquid hazards due to its excellent thermal and chemical stability. Here, vermiculite was expanded by two steps: exfoliation by 30 wt% H2O2 treatment at 60 degrees C and subsequent expansion by microwave heating. This two-step expansion produced more homogenously separated concertina-like eVMTs with a higher total pore volume of 7.75 cm(3) g(-1) than the conventional thermal method. The two-step eVMT was found to be greatly superior to the thermal and commercial silver counterparts in hazardous liquid-uptake performance. The uptake was simply interpreted as a physical infilling process of a liquid into the eVMT pores, and the spontaneous hazard removal with a great capacity was discussed with the large pore volume of two-step eVMT and its suitable pore dimensions for capillary action. As a practical device, a prototype absorbent assembly made of these eVMTs demonstrated the successful mitigation of liquid hazards on an impermeable surface.
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