Preparation and Photocatalytic Properties of a Bagasse Cellulose-Supported Nano-TiO2 Photocatalytic-Coupled Microbial Carrier

Abstract

Intimate coupling of photocatalysis and biodegradation (ICPB) has shown promise in removing unwanted organic compounds from water. In this study, bagasse cellulose titanium dioxide composite carrier (SBC-TiO2) was prepared by low-temperature foaming methods. The optimum preparation conditions, material characterization and photocatalytic performance of the composite carrier were then explored. By conducting a single factor test, we found that bagasse cellulose with a mass fraction of 4%, a polyvinyl alcohol solution (PVA) with a mass fraction of 5% and 20 g of a pore-forming agent were optimum conditions for the composite carrier. Under these conditions, good wet density, porosity, water absorption and retention could be realized. Scanning electron microscopy (SEM) results showed that the composite carrier exhibited good biologic adhesion. X-ray spectroscopy (EDS) results confirmed the successful incorporation of nano-TiO2 dioxide into the composite carrier. When the mass concentration of methylene blue (MB) was 10 mg L−1 at 200 mL, 2 g of the composite carrier was added and the initial pH value of the reaction was maintained at 6, the catalytic effect was best under these conditions and the degradation rate reached 78.91% after 6 h. The method of preparing the composite carrier can aid in the degradation of hard-to-degrade organic compounds via ICPB. These results provide a solid platform for technical research and development in the field of wastewater treatment.

A Cellulose-Type Carrier for Intimate Coupling Photocatalysis and Biodegradation

“…The calculation method was as followed: absorb surface moisture by filter papers after soaking the prepared carriers in deionized water for 24 h and weighing its wet weight ( m 1 ); measured total volume ( V 1 ) of carriers by the drainage in cylinder (100 mL, with accuracy of 1 mL); weigh the dry weight ( m 0 ) of the carriers after drying for 6 h at a temperature of 60 ℃ in a vacuum drying oven; stir the mixture of water and carriers for 60 min at a speed of 500 r/min in a beaker (1 L, with 600 mL water), in which carriers were added by the volume ratio of 1/15 (carrier/water); after stirring, measure the total volume ( V 2 ) of the carriers again. The wet density ( ρ , g/cm 3 ), water absorption ( ω , %), porosity ( ε , %) and retention rates ( σ , %) were then calculated using the following Equation [ 21 ]: …”

High Internal Phase Emulsion Template Strategy for the Preparation of UiO-66-NH2 Foam Photocatalysts: A Pseudomonas putida Intimately Coupled UiO-66-NH2 System for Efficient Removal of Antibiotics

“…Pseudomonas putida (P. putida), as a Gram negative bacterium commonly found in water and soil, has been extensively investigated in wastewater treatment owing to its good degradation capacity, strong vitality, and low cost. − Nevertheless, antibiotics and fungicides have strong bacteriostatic activity in general, which still leads to their reduction in the bio-degradation effect. , …”

“…5−7 Nevertheless, antibiotics and fungicides have strong bacteriostatic activity in general, which still leads to their reduction in the bio-degradation effect. 8,9 Semiconductor photocatalytic technology, as a new, efficient, low-cost, and green approach, 10 has attracted extensive attention and exhibited broad prospects in water purification. 11−15 However, as we all know, most current photocatalytic methods still face inefficient and incomplete decontamination issues (especially for the contaminants with obstinate nature and a stable structure), which severely limits their practical applications.…”

Undissolved Ilmenite Mud from TiO2 Production—Waste or a Valuable Addition to Portland Cement Composites?

“…Ilmenite MUD, due to its high content of silica, which was subjected to intensive mechanical which increased highly its specific area and also chemical treatment, might be a highly active pozzolanic material. The treatment that accompanies the process of waste formation and the constitution of this material may suggest that the composition contains nano-particles of SiO 2 and TiO 2 [22,23], which, as shown in the literature, are characterised by high reactivity and influence the microstructure of composites [24][25][26][27][28]. The nano particles of TiO 2 might also have a photocatalytic properties [27].…”

“…The treatment that accompanies the process of waste formation and the constitution of this material may suggest that the composition contains nano-particles of SiO 2 and TiO 2 [22,23], which, as shown in the literature, are characterised by high reactivity and influence the microstructure of composites [24][25][26][27][28]. The nano particles of TiO 2 might also have a photocatalytic properties [27]. The aim of the rinsing and filtration process was to receive more of the titanyl sulphate from the MUD, which is a valuable substitute for TiO 2 production, and to decrease the concentration of sulphate acid and some of the heavy metals.…”