Removal of Cr(VI) by modified diatomite supported NZVI from aqueous solution: evaluating the effects of removal factors by RSM and understanding the effects of pH | Zendy

Yongxiang Zhang | Zendy; Zhenjun Tian | Zendy; Qi Jing | Zendy; Yuanyuan Chen | Zendy; Xuezheng Huang | Zendy

Open Access

Removal of Cr(VI) by modified diatomite supported NZVI from aqueous solution: evaluating the effects of removal factors by RSM and understanding the effects of pH

Author(s) -

Yongxiang Zhang,

Zhenjun Tian,

Qi Jing,

Yuanyuan Chen,

Xuezheng Huang

Publication year - 2019

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2019.275

Subject(s) - response surface methodology , aqueous solution , box–behnken design , zerovalent iron , chemistry , central composite design , surface charge , composite number , materials science , nuclear chemistry , chemical engineering , chromatography , composite material , adsorption , engineering

In this study, a novel composite of modified diatomite supported nanoscale zero-valent iron (mD-NZVI) was synthesized and characterized. The effects of four factors (mD-NZVI dose, temperature, contact time and initial pH) on the removal of Cr(VI) by mD-NZVI were studied by experimental work and analyzed by response surface methodology (RSM). A second-order polynomial equation fitted by Box-Behnken design was used as a statistical model and proved to be precise in describing the significance of four factors. The analysis results show that the effects of four factors on the removal efficiency of Cr(VI) were significant (F value is 19.83), initial pH was found to be the key factor. In addition, the effect of initial pH was further studied and the maximum removal efficiency of 89.34% was obtained at pH of 3, the decrease in removal efficiency with the increase in pH is a synergistic effect of Cr(VI) species, surface charge of mD-NZVI and OH - amount at different pH.

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