Inorganic Chemicals Industry ›› 2021, Vol. 53 ›› Issue (10): 119-124.doi: 10.19964/j.issn.1006-4990.2020-0635

• Catalytic Materials • Previous Articles     Next Articles

Degradation of methylene blue by catalytic peroxymonosulfate with Ni(OH)2synthesized through chemical bath deposition method

Xia Qiang(),Liao Xiaogang,Li Gang()   

  1. College of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054,China
  • Received:2020-11-23 Online:2021-10-10 Published:2021-10-11
  • Contact: Li Gang E-mail:1409623509@139.com;ligang2015@cqut.edu.cn

Abstract:

Powder nickel hydroxide hydrate(Ni(OH)2·0.75H2O)was successfully prepared by a simple chemical bath depo-sition(CBD) method.The sample exhibited a micro/nano hierarchical structure.Namely,these powders presented irregular granule appearance with micron-size,which were actually made up of many nano-flakes.The performance of powdered nickel hydroxide hydrate used as catalyst for decomposition of methylene blue(MB) in aqueous solution with potassium monopersul-fate(PMS) was investigated.The results showed that the Ni(OH)2·0.75H2O/PMS composite system had an outstanding cata-lytic ability in MB degrading.The degradation rate of MB was 84.33%.Under the same conditions,the degradation rates of MB by Ni(OH)2·0.75H2O or PMS were only 9.46% and 21.19%,respectively.The degradation rate of MB solution increased with the increase of the amount of PMS in the reaction system and decreased with the increase of the initial concentration of MB,which also increased firstly and then remained unchanged with the increase of the amount of catalyst.The introduction of C2O42- 或 PO43- anion into Ni(OH)2/PMS system could inhibit the degradation of MB solution,and the inhibition rates were 65.77% and 16.44%,respectively,but the introduction of NO3- had no inhibition on the degradation of MB.The results of free radical capture confirmed that ·SO4 - was the main active intermediate involved in the direct oxidative degradation of MB.Kinetic analysis showed that the degradation of MB solution by PMS catalyzed by nickel hydroxide was a second-order reaction,and its apparent reaction rate constant k=5.39 L/(mmol·min).

Key words: chemical bath deposition method, nickel hydroxide, potassium monopersulfate, catalytic degradation, methylene blue

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