Beschreibung:
Herein, we proposed a mild method for the preparation of carbon quantum dots (CQDs) nanofluids, in which PEG-200 as raw material greatly reduced nanomaterial cost. To ensure the effectiveness of CQDs nanofluids in real seawater desalination, a systematic stability evaluation and stability mechanism study were conducted, and the results showed almost all of CQDs nanofluids could keep stable in a wide NaCl concentration range with absolute Zeta potential value over 30 mV. Meanwhile, CQDs nanofluids diluted from slurry were confirmed with stability in seawater including other salt ions and natural organic matters. Moreover, CQDs nanofluids were proved with high thermal stability and the variation of Turbiscan stability index (TSI) value was below 0.24 after five heating cycling. The optical properties of them displayed over 85 % incoming solar energy can be captured by 1 cm of 10 vol.% CQDs nanofluids implying their application potential in solar desalination. Finally, the performance of traditional and CQDs nanofluids modified solar still was compared, and the total water production increased about 58.0%. The economic analysis indicated that water production cost is 0.013 to 0.015 $/L for modified solar still with CQDs nanofluids under two operating modes, which both are lower than traditional solar still