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.
类施氏矿物对工业废水中Cr(Ⅵ)的去除
- Title:
- Schwertmannite-like Mineral Materials for Removal of Cr(Ⅵ) from Industrial Wastewater
- Keywords:
- Schwertmannite-like mineral materials; industrial wastewater; Cr(Ⅵ ); coexisting ion concentration; co-precipitation
- 摘要:
- 在FeSO4·7H2O、H2O2合成施氏矿物过程中添加Na2SiO3、CaCl2以制备类施氏矿物，用于去除工业废水中的Cr（Ⅵ）。在转速为150 r/min的条件下进行10 min摇瓶试验，分析类施氏矿物去除Cr（Ⅵ）的关键影响因素及其作用机制。结果表明，当共存离子浓度（Na+、Mg2+、K+）由20 mmol/L增至100 mmol/L时，Cr（Ⅵ）去除率由95.16%~96.27%降至30.65%~31.35%，共存离子浓度增大对Cr（Ⅵ）的去除存在显著的抑制作用；当络合剂浓度由0.5 mmol/L增至8.0 mmol/L时，Cr（Ⅵ）去除率由97.52%~97.86%降至75.22%~75.33%，络合剂浓度增大会抑制Cr（Ⅵ）的去除。在最佳反应条件下，投加11.12 g/L的FeSO4·7H2O、6.66 g/L的H2O2、8.53 g/L的Na2SiO3、4.44 g/L的CaCl2进行摇瓶试验，对Cr（Ⅵ）的去除率达到97.7%，较施氏矿物提高了49.72%；类施氏矿物在6~8 min内合成完，且在反应1 min内可以将Cr（Ⅵ）基本去除，较施氏矿物的处理时间缩短了约36 h；反应结束后40 d内，类施氏矿物溶液中Cr（Ⅵ）的最高溶出率为1.16%，较施氏矿物降低了27.23%，这是类施氏矿物通过静电吸附、离子交换、共沉淀及网捕等多重途径作用的结果。
- 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.
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