| 1 |
What is the primary role of transition metal ion catalysts in the catalytic ozonation process for nanoplastic removal?
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To facilitate the decomposition of O3 and generate active free radicals |
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The metal ions facilitate the decomposition of ozone into reactive oxygen species, improving the efficiency of the ozonation process. This reaction, often enhanced by the transition metal, lowers the energy barrier for ozone activation, making it more efficient at breaking down pollutants.
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| 2 |
According to the article, what was the observed effect of using Co2+ at 1 mM on the mineralization rate of polystyrene nanoplastics during ozonation?
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Increased mineralization rate by 70% |
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It effectively accelerated the conversion of polystyrene nanoplastics into simpler, inorganic molecules, indicating a higher degree of mineralization compared to ozonation without the catalyst.
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| 3 |
In the context of nanoplastics removal, what does the scavenger experiment with methanol demonstrate about the catalytic ozonation process?
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Methanol has no effect on the catalytic process |
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| 4 |
If the initial concentration of nanoplastics is 20 mg/L and the catalytic ozonation achieves a 70% mineralization rate, what is the concentration of remaining nanoplastics?
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6 mg/L |
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ความเข้มข้นที่เหลืออยู่ = ความเข้มข้นเริ่มต้น x (1-อัตรา Mineralization)
ความเข้มข้นที่เหลืออยู่ = 20mg/L x (1-0.70)
ความเข้มข้นที่เหลืออยู่ = 20mg/L x 0.30
ความเข้มข้นที่เหลืออยู่ = 6 mg/L
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| 5 |
Given an ozone flow rate of 0.5 NL/min and an ozonation time of 120 minutes, how much ozone (in grams) has been used if the ozone concentration is 10 mg/NL?
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0.6 grams |
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ปริมาณ03 ทั้งหมด = Flow rate x time
ปริมาณ03 ทั้งหมด = 0.5 x 120
ปริมาณ03 ทั้งหมด = 60 NL
.
.
มวลโอโซนทั้งหมด = ปริมาตรโอโซนทั้งหมด x ความเข้มข้นของโอโซน
มวลโอโซนทั้งหมด = 60 x 10
มวลโอโซนทั้งหมด = 600 mg = 600/1000 = 0.6 grams
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| 6 |
If reducing the turbidity of water by catalytic ozonation with Co2+ from 100 NTU to 35 NTU represents a 65% reduction, what was the original turbidity?
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100 NTU |
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| 7 |
What is a major benefit of catalytic ozonation over single ozonation in water treatment?
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It provides higher mineralization rates |
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| 8 |
Which of the following is NOT a transition metal ion used as a catalyst in the study?
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Ca2+ |
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| 9 |
What environmental issue does the removal of nanoplastics address?
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Reduction of water pollution |
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| 10 |
What analytical technique is NOT mentioned as used for monitoring the degradation of nanoplastics?
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Mass Spectrometry |
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| 11 |
What effect does the melt fiber spinning system have on the crystallinity of PET fibers?
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It has no effect on the crystallinity. |
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| 12 |
What role does the spooling speed play in the fiber spinning system described in the article?
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Higher spooling speeds lead to lower crystallinity and smaller fiber diameters. |
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| 13 |
According to the article, what was the impact of using the LCC-ICCG enzyme on PET depolymerization?
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It was less effective than mechanical recycling methods. |
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| 14 |
If the initial mass of PET before enzymatic treatment in a bioreactor was 500 grams and 96.9% mass was lost due to depolymerization, what is the final mass of PET?
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15.5 grams |
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| 15 |
Considering the average crystallinity of PET fibers after treatment is 9.7%, what would be the crystallinity if the process conditions were unaltered but the drop distance doubled?
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It would remain the same due to other compensating factors. |
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| 16 |
If the surface area to volume ratio of PET increased 15-fold due to processing, and the initial ratio was 0.1 mm²/mm³, what is the new ratio?
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1.5 mm²/mm³ |
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| 17 |
What is a major advantage of the melt fiber spinning system over traditional recycling methods?
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Produces higher crystallinity PET |
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| 18 |
What does the term 'amorphous content' refer to in the context of PET recycling?
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The amount of impurities in PET |
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| 19 |
What is the primary benefit of reducing the crystallinity of PET in recycling processes?
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It enhances the enzymatic degradation efficiency. |
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| 20 |
Which measurement technique was used to assess the polymer spectra to confirm the presence of PET?
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Scanning Electron Microscopy |
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