“…Thus, higher dopant concentration in m-BiVO 4 could induce the formation of small amount of t-BiVO 4 . Similarly, partial transitions of m-BiVO 4 to t-BiVO 4 by doping were reported in Zn-doped BiVO 4 [30], Ag-doped BiVO 4 [31] and Gd-doped BiVO 4 [32].…”
Section: Pxrd and Raman Analysissupporting
confidence: 57%
“…Thus, higher dopant concentration in m -BiVO 4 could induce the formation of small amount of t -BiVO 4 . Similarly, partial transitions of m -BiVO 4 to t-BiVO 4 by doping were reported in Zn-doped BiVO 4 [30], Ag-doped BiVO 4 [31] and Gd-doped BiVO 4 [32]. Figure 1 (a) Powder X-ray diffraction patterns of undoped and strontium doped BiVO 4 along with JCPDS reference pattern of monoclinic BiVO 4 and (b) Magnified portion of powder X-ray diffraction patterns of all the samples from 2θ range of 26 to 34 ° (* symbol indicates the reflections from secondary tetragonal BiVO 4 phase).…”
Nanosized m-BiVO4 and Sr-doped derivatives were prepared by solid state reactions, to produce Bi1-xSrxVO4 (X = 0%, 4%, 8% & 12%). XRD and Raman investigations confirmed the formation of BiVO4 phase. 8% and 12% doped samples contained a small fraction of secondary t-BiVO4 phase. SEM images exhibited flat and irregular nanoparticles (64–70 nm). Estimated band gaps were in visible region (2.34–2.42 eV). The materials were used to photodegrade malachite green and BVO-12 showed maximum efficiency ˜ 88% in 180 min. The catalyst was stable and effective for three cycles. Radical scavenging experiments proved the role of holes and hydroxyl radicals. Polymer nanocomposite films made of EOC and photocatalyst were prepared. 0.15 g catalyst loaded film showed maximum activity and recyclability.
“…Thus, higher dopant concentration in m-BiVO 4 could induce the formation of small amount of t-BiVO 4 . Similarly, partial transitions of m-BiVO 4 to t-BiVO 4 by doping were reported in Zn-doped BiVO 4 [30], Ag-doped BiVO 4 [31] and Gd-doped BiVO 4 [32].…”
Section: Pxrd and Raman Analysissupporting
confidence: 57%
“…Thus, higher dopant concentration in m -BiVO 4 could induce the formation of small amount of t -BiVO 4 . Similarly, partial transitions of m -BiVO 4 to t-BiVO 4 by doping were reported in Zn-doped BiVO 4 [30], Ag-doped BiVO 4 [31] and Gd-doped BiVO 4 [32]. Figure 1 (a) Powder X-ray diffraction patterns of undoped and strontium doped BiVO 4 along with JCPDS reference pattern of monoclinic BiVO 4 and (b) Magnified portion of powder X-ray diffraction patterns of all the samples from 2θ range of 26 to 34 ° (* symbol indicates the reflections from secondary tetragonal BiVO 4 phase).…”
Nanosized m-BiVO4 and Sr-doped derivatives were prepared by solid state reactions, to produce Bi1-xSrxVO4 (X = 0%, 4%, 8% & 12%). XRD and Raman investigations confirmed the formation of BiVO4 phase. 8% and 12% doped samples contained a small fraction of secondary t-BiVO4 phase. SEM images exhibited flat and irregular nanoparticles (64–70 nm). Estimated band gaps were in visible region (2.34–2.42 eV). The materials were used to photodegrade malachite green and BVO-12 showed maximum efficiency ˜ 88% in 180 min. The catalyst was stable and effective for three cycles. Radical scavenging experiments proved the role of holes and hydroxyl radicals. Polymer nanocomposite films made of EOC and photocatalyst were prepared. 0.15 g catalyst loaded film showed maximum activity and recyclability.
“…9c). The 10%-C 3 N 4 /Zn 0.5 Cd 0.5 S shows higher photocurrent density than the pure g-C 3 N 4 or Zn 0.5 Cd 0.5 S, indicating a better charge separation 68 in this member. Besides, the 10%-C 3 N 4 /Zn 0.5 Cd 0.5 S has a lower overpotential than that of the pure g-C 3 N 4 and Zn 0.5 Cd 0.5 S in Fig.…”
We present synthesis of 2D g-C3N4 nanosheets prepared by high-temperature calcination resulting in a series of 2D/0D g-C3N4/Zn0.5Cd0.5S heterojunctions. The structure, microscopic morphology, photoelectric performance, photocatalytic performance, and the mechanism for enhanced photocatalytic performance were studied through various characterization methods. Results indicate that 0D Zn0.5Cd0.5S nanoparticles (ca. 3~5 nm) were uniformly dispersed on the surface of the g-C3N4 and formed a heterostructure. The photoelectrochemical test shows that an appropriate amount of g-C3N4 modification (10%-C3N4/Zn0.5Cd0.5S) can effectively improve the separation and transfer efficiency of photogenerated carriers. In addition, with the amount of g-C3N4, the hydrogen production performance of the g-C3N4/Zn0.5Cd0.5S samples first increased and then decreased. When the amount of loaded g-C3N4 is 10%, the photocatalytic activity of the 10%-C3N4/Zn0.5Cd0.5S is highest, with hydrogen production of 3.53 mmol·g-1·h−1, 2.8-fold higher than that of pure Zn0.5Cd0.5S (1.26 mmol·g-1·h−1). The enhanced photocatalytic performance could be attributed to introduced g-C3N4 which can supply more reaction sites, and the formation of the heterojunction interface which could effectively improve the separation and migration of photogenerated charge carriers. Therefore, designing a low cost and efficient photocatalys without precious metals will provide a feasible solution to meet the increasing global energy demand.
“…Regmi et al 45 observed that the monoclinic structure remains intact until 2% doping of Cu 2+ in the BiVO 4 lattice, and Cu 2+ substitutes Bi 3+ rather than V 5+ . Zou et al 46 mentioned that 2.5% doping of Zn 2+ in BiVO 4 results in the M-T heterostructure formation and also found the substitution of Bi 3+ by Zn 2+ . Out of these, only Ni 2+ -doped BiVO 4 had been used to study the degradation of CV.…”
Fabrication of codoped photocatalysts is a developing area of research. Herein, we explore the visible light photocatalytic properties of Cu, Zn codoped BiVO 4 particles. Doping lower valent cations (Cu and Zn) makes the BiVO 4 surface more acidic and enables us to target the basic crystal violet (CV) dye. The adopted hydrothermal protocol of synthesis results in the formation of Cu−Zn codoped monoclinic BiVO 4 particles. Undoped monoclinic BiVO 4 , prepared by the same protocol, showed significant formation of oxygen vacancies. XPS analyses confirm the coexistence of Cu 2+ /Cu + and Zn 2+ dopants. Increased dopant percentage reduced oxygen vacancies. XRD indicates that Cu 2+ /Cu + or Zn 2+ dopants generally substitute Bi 3+ in BiVO 4 . All photocatalysis activities for CV degradation are reported under near-neutral pH conditions. A typical codoped BiVO 4 photocatalyst with 1% Zn and 2% Cu demonstrated the best CV degradation photocatalytic activity. The activity of this Zn, Cu codoped photocatalyst is better than that of pure, Zn-doped, and Cu-doped BiVO 4 samples. Active species trapping experiments indicated the possible photocatalysis mechanism. The photocatalysts exhibited appropriate recyclability and photostability.
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