Abstract
To achieve the full utilization of waste rice noodle (WRN) without secondary pollution, activated carbon (AC) and carbon quantum dots/titanium dioxide (CQDs/TiO2) composite were simultaneously synthesized by using WRN as raw material. Both of the two materials showed potential applications in water pollution control. The AC based on WRN displayed a porous spherical micro-morphology, which could absorb heavy metal elements like Pb(II) and Cr(VI) efficiently, with a maximum equilibrium uptake of 12.08 mg·g−1 for Pb(II) and 9.36 mg·g−1 for Cr(VI), respectively. The adsorption of the resulted AC could match the Freundlich adsorption isotherm and the pseudo-second-order kinetics mode. On the other hand, the CQDs/TiO2 composite based on WRN displayed a high efficient photocatalytic degradation effect on various water-soluble dyes such as methylene blue, malachite green, methyl violet, basic fuchsin, and rhodamine B under visible light irradiation, which showed better photocatalytic performance than commercial TiO2. The introduction of CQDs based on WRN to TiO2 could result in efficient electron-hole pair separation and enable more photogenerated electrons to reduce O2 and more photogenerated holes to oxidize H2O or OH−, which could cause stronger abilities in producing O2·− and ·OH radical and better photocatalytic activity.
Highlights
Published: 29 January 2022Cooking waste can cause potential pollution to the soil and water environment and provide a significant challenge to urban governance [1,2,3]
In order to achieve the full utilization of waste rice noodle (WRN) and obtain low-cost carbon materials for water pollution control, we design a new method for co-producing activated carbon (AC) and carbon quantum dots (CQDs)/TiO2 composite with WRN as raw materials (See Figure 1)
AC both accorded with pseudo-second-order modelprocess better, which suggested that the metal adsorption the pseudo-second-order kineticby model better, which suggested that the heavy metal adprocess of the AC was controlled the chemisorption mechanism
Summary
Cooking waste can cause potential pollution to the soil and water environment and provide a significant challenge to urban governance [1,2,3]. Pure TiO2 displays a wide band gap whose photogenerated electrons and holes are easy to combine again It has a low absorption and utilization rate of visible light whose wavelength is more than 380 nm, which limits its application in visible light catalysis. In order to achieve the full utilization of WRN and obtain low-cost carbon materials for water pollution control, we design a new method for co-producing AC and CQDs/TiO2 composite with WRN as raw materials (See Figure 1). The obtained AC could absorb heavy metal elements, while the CQDs/TiO2 composite displayed a high efficient photocatalytic degradation effect on water-soluble dyes, which could together form a wastewater treatment system
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