The construction of efficient and
stable heterojunction photocatalysts
with a controllable close contact interface and visible-light response
is a challenging research topic in the field of photocatalysis. Herein,
a series of BiOCl/rutile-TiO2 (R-TiO2) nanorod
heterojunctions were constructed using R-TiO2 nanorods
as supporting frameworks followed by selective adsorption of Cl– on R-TiO2(110) facets and in situ growth of BiOCl on the surface of TiO2 nanorods. The
strong affinity of rhodamine B (RhB) as a photosensitizer for BiOCl
allowed the prepared BiOCl/R-TiO2 heterojunctions to work
efficiently under visible-light irradiation. The dye-sensitized BiOCl/R-TiO2 nanorod heterojunctions displayed promising photocatalytic
performance for simultaneously treating RhB and the persistent organic
pollutant 2-sec-butyl-4,6-dinitrophenol (DNBP). The
highly enhanced photodegradation activity of the BiOCl/R-TiO2 system was mainly attributed to the efficient RhB-photosensitization
effect, the enhanced heterojunction effect, and the suitable conduction
band match between BiOCl and R-TiO2, which facilitated
electron transfer from the excited RhB to the catalyst surface and
charge separation across the BiOCl/R-TiO2 interface, thus
promoting the formation of •O2
– and h+ as dominant active species in the reaction system
for degradation of pollutants. The results demonstrate that the construction
of a dye-sensitized BiOCl/R-TiO2 heterojunction system
is an effective strategy for improving the photocatalytic potential.
A novel and simple method was described for preparation of carbonaceous adsorbent (CA) from corncob under phosphoric acid conditions. The method succeeded to introduce oxygen-containing groups onto the product surface through hydrothermal carbonization (HTC) at low temperature of 160 °C. Adsorption of methylene blue (MB) was studied systematically through the effect of pH, contact time and initial dye concentrations. The MB adsorption kinetics and isotherms experiments showed that Langmuir model and pseudo-second-order model could better describe the adsorption behavior, with a maximum adsorption capacity of MB was 140.25 mg/g. The high adsorption capacity could be ascribed to the presence of surface oxygen-containing functional groups and pore channels. In conclusion, it could be a potential adsorbent in the removal of methylene blue from wastewater.
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