**4. Conclusions**

In summary, the high-photothermal conversion composite material can be produced in a large scale with a low-cost by a physical evaporation phase inversion method in which rGO was loaded into the nonwoven fabric as a main photothermal conversion material. The non-woven fabric is rGO composite membrane, and its mechanical properties are relatively proficient. It can be used repeatedly for seawater purification after sonication based on photothermal heating. The rGO-loaded nonwoven fabric has a high permeability and an evaporation rate of five–six times higher than conventional evaporation. For the solar density of about 726 kw/m2, our method can purify 2.35 L of seawater to be evaporated into water vapor for purification. Cell viability studies indicate the purified water has

no cell toxicities, while the seawater is highly toxic at high concentrations. Our method designed is viable for drinking water purification from seawater.

**Author Contributions:** Conceptualization, J.H. and Z.C.; methodology, Z.L.; software, Z.C.; validation, J.H., Z.C. and Z.L.; formal analysis, Z.C.; investigation, J.H. and W.L.; resources, Z.L.; data curation, Z.C.; writing—original draft preparation, Z.L.; writing—review and editing, Z.L. and W.C.; visualization, Z.L.; supervision, Z.L. and W.C.; project administration, Z.L. and W.C.; funding acquisition, Z.L. and W.C.; Editing—C.X. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by High-level talents project of Hainan Basic and Applied Basic Research Program gran<sup>t</sup> number 2019RC141 and partially by UT Arlington.

**Institutional Review Board Statement:** This study was approved by the institutional review committee of our Universities.

**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study.

**Acknowledgments:** W.C. would like to thank the support from Solgro Inc., Guangxi Jialouyuan Medical Inc. and UT Arlington distinguished award.

**Conflicts of Interest:** The authors declare no conflict of interest.
