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The influence of aluminum chloride on biosynthetic schwertmannite and Cu(II)/Cr(VI) adsorption

机译：氯化铝对生物合成的影响和Cu（II）/ Cr（VI）吸附的影响

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The iron oxyhydroxides schwertmannite and akaganeite are recognized as promising absorbents for heavy metal contaminated water treatment. In this study, aluminium chloride modified schwertmannite was biosynthesized using Acidithiobacillus ferrooxidans and characterized using SEM, FTIR, XRD, TGA, potentiometric titrations and XPS. The effect of pH, and the adsorption kinetics, isotherms and mechanism were systematically investigated. With increasing aluminium chloride, the adsorbent transformed from nanoscale villus covered spherical aggregates to rod like structures consisting of globes, and facilitated the decreasing crystallinity and akaganeite formation. The optimum pH for Cr(VI) adsorption was between 6.0 and 7.0, while Cu(II) adsorption was increased over the pH range of 4.0- 8.0. The adsorption kinetics varied with pH and the adsorbents. Equilibrium was reached within 30 min for both metals, and the pseudo-second-order model fitted the adsorption process well. The maximum Cu(II) and Cr(VI) adsorption reached 23.95 and 57.60 mg g~(-1) which occurred at an FeSO4$7H2O/AlCl3 ratio of 15 : 5 and 15 : 10 respectively. As for the binary metal system, the maximum adsorption for Cu(II) and Cr(VI) was 14.10 and 28.89 mg g~(-1) , respectively, achieved with an FeSO4$7H2O/AlCl3 ratio of 15 : 5. The modification enhanced the adsorption capacity effectively. Additionally, the adsorbent could be effectively regenerated through pH 2.0 water washing. FTIR, XPS and released proton correlation analysis revealed that -O-H, O-H-Cl and SO4 ~(2-) were the key groups in adsorption. Heavy metals were adsorbed on schwertmannite through anion-exchange and surface complexation. Heavy metals can be efficiently removed by the modified biosynthetic schwertmannite.
机译：铁羟基氧化铁Schwertmannite和Akaganeite被认为是重金属污染水处理的有前途的吸收剂。在该研究中，使用酸酐铁氧化物生物氧化铝改性Schwertmannite并使用SEM，FTIR，XRD，TGA，电位滴定和XPS进行了表征。系统地研究了pH和吸附动力学，等温物，等温度和机理的影响。随着氯化铝的增加，从纳米级绒毛覆盖的球形聚集体转化的吸附剂与地球组成的棒状结构，并促进了结晶度和αkaganeite形成的降低。 Cr（VI）吸附的最佳pH值为6.0和7.0，而Cu（II）吸附在4.0-8.0的pH范围内增加。吸附动力学随pH和吸附剂而变化。金属30分钟内达到平衡，伪二阶模型很好地拟合吸附过程。最大Cu（II）和Cr（VI）吸附达到23.95和57.60mg G〜（-1），其分别为15：5和15：10的FeSO4 $ 7H2O / ALCL3比例发生。对于二元金属系统，Cu（II）和Cr（VI）的最大吸附分别为14.10和28.89mg g〜（-1），以FesO4 7小时/ alcl3比例为15：5。修改有效增强了吸附能力。另外，通过pH2.0水洗可以有效地再生吸附剂。 FTIR，XPS和释放的质子相关分析显示，-O-H，O-H-Cl和SO4〜（2-）是吸附中的关键基团。通过阴离子交换和表面络合吸附重金属在Schwertmannite上。通过修饰的Biosynthetic Sc​​hwertmannite可以有效地去除重金属。

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  • 来源
    《RSC Advances》 |2015年第114期|共13页
  • 作者

    Min Gan; Zhihe Zheng; Shengjie Sun;

  • 作者单位

    School of Minerals Processing and Bioengineering Key Laboratory of Biometallurgy of Ministry of Education Central South University Changsha 410083 China.;

    School of Minerals Processing and Bioengineering Key Laboratory of Biometallurgy of Ministry of Education Central South University Changsha 410083 China.;

    School of Minerals Processing and Bioengineering Key Laboratory of Biometallurgy of Ministry of Education Central South University Changsha 410083 China.;

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  • 正文语种 eng
  • 中图分类 化学;
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