Removal of chromium from aqueous solution by porous Bi2MoO6@BiOCl nanostructure

• Published in: Journal of solid state chemistry Vol. 292; p. 121719
• Main Authors: Shah, Abid Hussain, Gu, Wenhao, Abideen, Zain Ul, Teng, Fei
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.12.2020
• Subjects: Adsorption; Bi2MoO6–BiOCl; Chromium (VI); Wastewater treatment; Bi2MoO6–BiOCl; Chromium (VI); Adsorption; Wastewater treatment
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2020.121719

Adsorption is one of the most economical and effective ways to isolate pollutants from wastewater. In this work, a porous Bi2MoO6@BiOCl (BMO@BOC) nanostructure is got via a simple one-pot hydrothermal method. Its adsorption performances for rhodamine blue (RhB), methyl orange (MO), methylene blue (MB) and chromium (VI) are investigated mainly. It is found that BMO@BOC sample has a significantly enhanced adsorption capacity for RhB, but a poor adsorption capacity for MO and MB. After 8 ​min, 70%, 86% and 94% of RhB are adsorbed by BMO, BOC and BMO@BOC, respectively. After 6 ​min, 77%, 16% and 13% of MO are adsorbed by BMO, BOC and BMO@BOC, respectively. After 8 ​min, 12%, 32% and 83% of MB are adsorbed by BMO, BOC and BMO@BOC, respectively. In addition, 9%, 21% and 33% chromium (VI) are adsorbed at pH ​= ​4, 7 and 9 by BMO@BOC after 20 ​min, respectively. The different adsorption behaviors are discussed. Meanwhile, the effect of additional inorganic salt on the adsorption of chromium (VI) is also investigated. The porous microstructures are beneficial for pollutant adsorption. This work can help us to understand the adsorption treatment processes for practical wastewater. The adsorption capacity of chromium increases with pH. Moreover, the high-valence anion ion obviously increases chromium adsorption, but cation ion does not. [Display omitted] •Porous Bi2MoO6/BiOCl(BMO@BOC) is got via one-pot hydrothermal method.•BMO@BOC shows a higher adsorption ability of chromium at a higher pH value.•Adding anion ion greatly increases chromium adsorption, but cation ion does not.•This work favors to understand adsorption processes for wastewater treatment.