Citation: WANG Xuejin, ZHU Xiaping, LAN Lumei. Efficient Removal of Cr (Ⅵ) in Wastewater by Mg/Al Layered Superamolecular Compounds[J]. Chinese Journal of Applied Chemistry, ;2017, 34(1): 98-104. doi: 10.11944/j.issn.1000-0518.2017.01.160115 shu

Efficient Removal of Cr (Ⅵ) in Wastewater by Mg/Al Layered Superamolecular Compounds

College of Materials and Chemistry & Chemical Engineering, Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu University of Technology, Chengdu 610059, China

Corresponding author: ZHU Xiaping, zhuxiaping@cdut.edu.cn
Received Date: 17 March 2016
Revised Date: 27 May 2016
Accepted Date: 27 May 2016

Fund Project: the Major Project of Education Department in Sichan 15ZA0071the Project Supported by Sichaun Technology Department Science and Technology Support Project 2015GZ0243

Figures(8)

Mg/Al layered compounds were prepared by using Na₂CO₃/NaOH, NaOH and NH₄OH as precipitants. Their Cr (Ⅵ) adsorption properties were studied using simulated wastewater containing Cr (Ⅵ). The structures of Mg/Al layered compounds were discussed in combination with X-ray diffraction XRD and Brunauer Emmett Teller (BET) methods surface area experiments. The results show that Mg/Al layered compounds have higher crystallinity, perfect layered structure, larger specific surface area and suitable pore distribution by using Na₂CO₃/NaOH as the precipitator. The optimal absorption efficiency of Cr (Ⅵ) can be reached when pH values are 7.0~9.0, and solid-liquid ratio at room temperature for 9 h is 1 g to 500 mL. The saturated adsorption capacity of Mg/Al layered compounds is 199.4 mg/g under the optimal conditions. The Cr (Ⅵ) in wastewater is removed by forming layered superamolecular compounds between anions containing Cr (Ⅵ) and Mg/Al layered compounds. The remaining Cr (Ⅵ) concentration of laboratory wastewater initially containing 226.1 mg/L is less than 0.5 mg/L after six absorption cycles with Mg/Al layered compounds. The treated wastewater is in line with national sewage comprehensive emission standard (GB8978-1996). Mg/Al layered compounds are excellent absorbents for disposing laboratory wastewater containing Cr (Ⅵ).
- Mg/Al-layered superamolecular compounds,
- memory effect,
- laboratory wastewater,
- Cr (Ⅵ),
- removal
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