A simple precipitation-calcination method was used to successfully prepare palygorskite (PAL)/CuO composite catalyst. As-prepared PAL/CuO composites were characterized by X-ray diffractions, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis diffused reflectance spectra. Photocatalytic activities of PAL/CuO composites were evaluated by the Cr(VI) reduction efficiency in the presence of tartaric acid under the illumination of visible light. Compared with a single component of PAL or CuO, the PAL/CuO composite catalyst showed outstanding photocatalytic performance, and Cr(VI) was completely reduced within 30 min. Effects of test parameters, such as initial pH, catalyst loading, and concentrations of tartaric acid, on the reduction efficiency of Cr(VI) have also been investigated. It is worth mentioning that the as-synthesized PAL/5.9CuO catalyst shows good reusability and can be effective in a wide range of pH (3–9) with quite high catalytic performance.
Get full access to this article
View all access options for this article.
References
1.
Barrera-DíazC.E., Lugo-LugoV., and BilyeuB. (2012). A review of chemical, electrochemical and biological methods for aqueous Cr(VI) reduction. J. Hazard. Mater. 223, 1.
2.
BounaL., RhoutaB., AmjoudM., MauryF., LafontM.C., JadaA., SenocqF., and DaoudiL. (2011). Synthesis, characterization and photocatalytic activity of TiO2 supported natural palygorskite microfibers. Appl. Clay Sci. 52, 301.
3.
DongG.H., and ZhangL.Z. (2013). Synthesis and enhanced Cr(VI) photoreduction prope of formate anion containing graphitic carbon nitride. J. Phys. Chem. C, 117, 4062.
4.
JiangD.J., LiY., WuY., ZhouP., LanY.Q., and ZhouL.X. (2012). Photocatalytic reduction of Cr(VI) by small molecular weight organic acids over schwertmannite. Chemosphere, 89, 832.
5.
KumarD.R., ManojD., SanthanalakshmiJ., and ShimJ.J. (2015). Au-CuO core-shell nanoparticles design and development for the selective determination of Vitamin B6. Electrochim. Acta, 176, 514.
6.
LealM., Martinez-HernandezV., MeffeR., LilloJ., and de BustamanteI. (2017). Clinoptilolite and palygorskite as sorbents of neutral emerging organic contaminants in treated wastewater: Sorption-desorption studies. Chemosphere, 175, 534.
7.
LiY., ChenC., ZhangJ., and LanY.Q. (2015). Catalytic role of Cu(II) in the reduction of Cr(VI) by citric acid under an irradiation of simulated solar light. Chemosphere, 127, 87.
8.
LiangR.W., JingF.F., ShenL.J., QinN., and WuL. (2015a). MIL-53(Fe) as a highly efficient bifunctional photocatalyst for the simultaneous reduction of Cr(VI) and oxidation of dyes. J. Hazard. Mater. 287, 364.
9.
LiangR.W., ShenL.J., JingF.F., QinN., and WuL. (2015b). Preparation of MIL-53(Fe)-reduced graphene oxide nanocomposites by a simple self-assembly strategy for increasing interfacial contact: Efficient visible-light photocatalysts. ACS Appl. Mater. Interfaces, 7, 9507.
10.
LiuJ.L., ZhaoY.R., MaJ.Z., DaiY.M., LiJ.Q., and ZhangJ. (2016). Flower-like ZnO hollow microspheres on ceramic mesh substrate for photocatalytic reduction of Cr(VI) in tannery wastewater. Ceram. Int. 42, 15968.
11.
LiuX.J., PanL.K., ZhaoQ.F., LvT., ZhuG., ChenT.Q., LuT., SunZ., and SunC.Q. (2012). UV-assisted photocatalytic synthesis of ZnO–reduced graphene oxide composites with enhanced photocatalytic activity in reduction of Cr(VI). Chem. Eng. J. 183, 238.
12.
LuY.Z., FuL., DingJ., DingZ.W., LiN., and ZengR.J. (2016). Cr(VI) reduction coupled with anaerobic oxidation of methane in a laboratory reactor. Water Res. 102, 445.
13.
MarinhoB.A., CristóvãoR.O., LoureiroJ.M., BoaventuraR.A.R., and VilarV.J.P. (2016). Solar photocatalytic reduction of Cr(VI) over Fe(III) in the presence of organic sacrificial agents. Appl. Catal. B, 192, 208.
14.
MurrayH.H. (2000). Traditional and new applications for kaolin, smectite, and palygorskite: A general overview. Appl. Clay Sci. 17, 207.
15.
RusminR., SarkarB., LiuY.J., McClureS., and NaiduR. (2015). Structural evolution of chitosan-palygorskite composites and removal of aqueous lead by composite beads. Appl. Surf. Sci. 353, 363.
16.
ShenL.J., HuangL.J., LiangS.J., LiangR.W., QinN., and WuL. (2014). Electrostatically derived self-assembly of NH2-mediated zirconium MOFs with graphene for photocatalytic reduction of Cr(VI). RSC Adv. 4, 2546.
17.
SunJ., MaoJ.D., GongH., and LanY.Q. (2009). Fe(III) photocatalytic reduction of Cr(VI) by low-molecular-weight organic acids with α-OH. J. Hazard. Mater. 168, 1569.
18.
WangN., ZhuL.H., DengK.J., SheY.B., YuY.M., and TangH.Q. (2010). Visible light photocatalytic reduction of Cr(VI) on TiO2 in situ modified with small molecular weight organic acids. Appl. Catal. B, 95, 400.
19.
WangC.C., DuX.D., LiJ., GuoX.X., WangP., and ZhangJ. (2016). Photocatalytic Cr(VI) reduction in metal-organic frameworks: A mini-review. Appl. Catal. B, 193, 198.
20.
WangW.B., TianG.Y., ZhangZ.F., and WangA.Q. (2015). A simple hydrothermal approach to modify palygorskite for high-efficient adsorption of Methylene blue and Cu(II) ions. Chem. Eng. J. 265, 228.
21.
XiY.F., SunZ.M., HreidT., AyokoG.A., and FrostR.L. (2014). Bisphenol A degradation enhanced by air bubbles via advanced oxidation using in situ generated ferrous ions from nano zero-valent iron/palygorskite composite materials. Chem. Eng. J. 247, 66.
22.
XuJ.J., XuZ.H., ZhangM., XuJ.Y., FangD., and RanW. (2015). Impregnation synthesis of TiO2/hydroniumjarosite composite with enhanced property in photocatalytic reduction of Cr(VI). Mater. Chem. Phys. 152, 4.
23.
XuZ.H., BaiS.Y., LiangJ.R., ZhouL.X., and LanY.Q. (2013). Photocatalytic reduction of Cr(VI) by citric and oxalic acids over biogenetic jarosite, Mater. Sci. Eng. C, 33, 2192.
24.
XuZ.H., JiangH.M., YuY.Q., XuJ.Y., LiangJ.R., ZhouL.X., and HuF. (2017). Activation and β-FeOOH modification of sepiolite in one-step hydrothermal reaction and its simulated solar light catalytic reduction of Cr(VI). Appl. Clay Sci. 135, 547.
25.
XuZ.H., YuY.Q., FangD., LiangJ.R., and ZhouL.X. (2016). Simulated solarlight catalytic reduction of Cr(VI) on microwave-ultrasonication synthesized flower-like CuO in the presence of tartaric acid. Mater. Chem. Phys. 171, 386.
26.
YangY.Q., LiuR.X., ZhangG.K., GaoL.Z., and ZhangW.K. (2016). Preparation and photocatalytic properties of visible light driven Ag-AgCl-TiO2/palygorskite composite. J. Alloys Compd. 657, 801.
27.
ZhangM., XuZ.H., LiangJ.R., ZhouL.X., and ZhangC.Y. (2015). Potential application of novel TiO2/β-FeOOH composites for photocatalytic reduction of Cr(VI) with an analysis of statistical approach. Int. J. Environ. Sci. Technol. 12, 1669.
