LANYi-miao,SHIMing-yan,LINShao-nan,et al.Schwertmannite-like Mineral Materials for Removal of Cr(Ⅵ) from Industrial Wastewater[J].China Water & Wastewater,2023,39(19):101-108.
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Schwertmannite-like Mineral Materials for Removal of Cr(Ⅵ) from Industrial Wastewater

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第19期 Page: 101-108 Column: Date of publication: 2023-10-01
Author(s):
LAN　Yi-miao1;  SHI　Ming-yan1;  LIN　Shao-nan1;  AN　Guan-feng2;  LU　Cui-yun3;  LI　Ni1;  LIN　Xing-zhu1;  LIU　Xu1;  LIU　Jia-yu4
（1. College of Civil Engineering， Guangzhou University， Guangzhou 510006， China； 2. Guangzhou Municipal Group Co. Ltd.， Guangzhou 510180， China； 3. South China Institute of Environmental Sciences， Ministry of Ecology and Environment， Guangzhou 510655， China； 4. Guangzhou Beikong Environmental Protection Engineering Co. Ltd.， Guangzhou 510000， China）
Keywords:
Schwertmannite-like mineral materials;  industrial wastewater;  Cr(Ⅵ );  coexisting ion concentration;  co-precipitation
Abstract:
Schwertmannite-like mineral materials were synthesized by adding Na2SiO3 and CaCl2 into the reaction between FeSO4·7H2O and H2O2 to remove Cr(Ⅵ) from industrial wastewater. The key influencing factors and mechanism of Schwertmannite-like mineral materials for Cr（Ⅵ) removal were analyzed by shaking bottle test for 10 min at a rotating speed of 150 r/min. When the concentration of the coexisting ions (Na+, Mg2+ and K+) increased from 20 mmol/L to 100 mmol/L, the removal rate of Cr(Ⅵ) decreased from 95.16%-96.27% to 30.65%-31.35%, and the increase of the coexisting ion concentration had a significant inhibitory effect on the removal of Cr(Ⅵ). When the concentration of complexant increased from 0.5 mmol/L to 8.0 mmol/L, the removal rate of Cr(Ⅵ) decreased from 97.52%-97.86% to 75.22%-75.33%, and the increasing concentration of complexant inhibited the removal of Cr(Ⅵ). Under the optimal reaction conditions, the removal rate of Cr(Ⅵ) reached 97.7% in the sharking bottle test with dosages of FeSO4·7H2O (11.12 g/L), H2O2 (6.66 g/L), Na2SiO3 (8.53 g/L) and CaCl2 (4.44 g/L), which was 49.72% higher than that of Schwertmannite. Schwertmannite-like mineral materials were synthesized within 6-8 min, and Cr(Ⅵ) was basically removed within 1 min, which was about 36 h shorter than the treatment time of Schwertmannite. Within 40 days after the reaction, the highest dissolution rate of Cr(Ⅵ) in the solution of Schwertmannite-like mineral materials was 1.16%, which was 27.23% lower than that of Schwertmannite. This was the result of multiple ways such as electrostatic adsorption, ion exchange, co-precipitation and enmeshment of Schwertmannite-like mineral materials.
Last Update: 2023-10-01