The petrochemical industry is an important pillar industry in China, which is related to the security and stability of the industrial and supply chains, green and low?carbon development, and the improvement of people's well?being. By matching macro?level urban digitalization data with micro?level petrochemical enterprise data from 2012 to 2021, an empirical analysis was conducted to examine the impact of digitalization on the green total factor productivity of petrochemical enterprises. Additionally, the mechanisms through which digitalization enhances the green total factor productivity of petrochemical enterprises were investigated. Research has found that: Digitization has significantly improved the green total factor productivity of petrochemical enterprises; for the eastern region, regions with higher levels of digitalization, and petrochemical enterprises with smaller scale and state?owned property rights, digitalization has a greater impact on improving their green total factor productivity; the mechanism of digitalization to enhance the green total factor productivity of petrochemical enterprises is to enhance regional innovation, promote green innovation of enterprises, and accelerate digital transformation of enterprises. Finally, suggestions are proposed to actively embrace digitalization, formulate differentiated development strategies, and leverage the leading role of state?owned enterprises, aiming to provide reference and guidance for improving green total factor productivity of petrochemical enterprises in China.

The bilirubin adsorption properties of three different types of carbon nanotubes (MW, LMW and SW) were studied. X?Ray Diffractomer (XRD) spectra shows that the diameters of the three carbon nanotubes are ranked as LMW>MW>SW. Scanning Electron Microscopy (SEM) and Brunner Emmet Teller (BET) show that MW has the best dispersion, a larger specific surface area, the largest pore size and a maximum pore volume. The bilirubin adsorption results show that the carbon nanotubes have the maximum bilirubin adsorption capacity when the temperature is set as 37^{℃ and the adsorption time reach 40 min. When the concentration of bilirubin is higher than 0.5 g/L, the bilirubin adsorption capacity of MW carbon nanotubes is the largest, and the maximum adsorption capacity of bilirubin reach 208 mg/g membrane. With increasing ion strength, albumin mass concentration, and under alkaline conditions, increasing pH does not benefit the absorption of bilirubin in the buffer solution. Compared with the conventional adsorbents, all the three carbon nanotubes show the excellent performance of short adsorption time and large adsorption capacity for bilirubin, which provide the experimental basis for the preparation of polymer microfiltration membranes blending with carbon nanotubes and its adsorption of bilirubin.}