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This work focused on the utilization of biological extract for the preparation of lignin-based carbon composites materials and used in the field of photocatalysis. A straightforward one-step carbonization way has been developed to prepare vanadium-doped lignin-based carbon/Bi 2 O 3 composites photocatalyst by using sodium lignosulfonate as the carbon source and catalyst. The application of lignin as the carbon source to form photocatalyst support tends to control the uniform distribution. At the same time, sodium lignosulfonate as the catalyst could break down the BiVO 4 during carbonization process. A series of characterizations demonstrated the BiVO 4 was transformed into Bi 2 O 3 and vanadium-doped lignin-based carbon. The possible synthesis process was proposed. Moreover, the novel V-doped carbon/Bi 2 O 3 composites photocatalyst displayed higher photocatalytic activity than bare BiVO 4. A possible photocatalytic mechanism was also discussed. This work provided new insight into the lignin-based carbon materials. • One-step carbonization for preparing novel V-doped lignin-based carbon/Bi 2 O 3 composites. • The biological extract of sodium lignosulfonate lignin both as the carbon source and catalyst to form carbon supporter and decomposition of BiVO 4. • The V played as the trapping centers in the lignin-based carbon for effectively separation of electron-hole pairs. [ABSTRACT FROM AUTHOR]

A novel, sensitive sensor material combined the technique of surface enhance Raman scattering (SERS) and molecular imprinting was prepared. It was used the amino-functionalized SiO 2 nanospheres as the supporting materials and anchored Ag nanoparticles on the surface by the function of coordination between Ag + and NH 2 − . Then, it was used that the Rhodamine 6G (R6G) as the template, acrylamide (AM) as functional monomer, ethyleneglycol dimethacrylate (EGDMA) as cross-linker, 2,2′-azobis(2-methylpropionitrile) (AIBN) as initiator to prepare the core-shell molecular imprinted polymers. Prominently, the shell thickness could be controlled by the regulation of cross-linker dosage and it was found that the SERS detection signal was most obvious when the shell thickness was about 40 nm. Under the optimal condition, it was presented good linear relationship (R 2 = 0.93) between the Raman signal (at 1505 cm −1 ) and the concentration of the templates and the limit of detection was 10 −12 mol L −1 . Meanwhile, the selective experiment was proved that this materials owned specific selectivity to the template. It was confirmed that the core-shell molecular imprinted polymers were a kind of highly sensitive and selective sensor materials in the field of R6G detection. [ABSTRACT FROM AUTHOR]