716
T. Liao et al.
Conclusion
The conclusions of this study can be drawn as follows. (1) Based on orthogonal
experiment, the influences of four factors A (temperature), B (the reaction time), C
(pH), and D (the molar ratio of Fe/As) on the method of treating as in waste acid by
Fe and CuSO 4 were analyzed, and the reaction time and pH were the main factors
affecting the removal rate of arsenic. The reaction time has a great influence on
the adsorption effect, and pH plays an important role in the displacement reaction,
the adsorption process, and the formation of iron oxides and hydroxides. (2) Based
on the orthogonal experiment, the best process of treating arsenic in waste acid by
adding Fe and CuSO 4 are as follows: temperature was 80 °C, the reaction time was
30 min, pH was 8, and the molar ratio of Fe/As was 8. The removal rate of arsenic
reached 91.73%. (3) By analyzing the main factors obtained through orthogonal
experiment and researching the results of the verification experiment from verified
experiment, the experimental mechanism was further studied. The mechanism was
that CuSO 4 was added, and the substitution reaction occurred between Fe and CuSO 4
to formed Cu. Then, forming Cu–Fe battery to accelerate the corrosion of iron powder
to form Fe(II) and Fe(III) (iron oxides and hydroxides) which adopt adsorption
coprecipitation mechanism is to remove arsenic from waste acid.
Acknowledgements This work was supported by a Yunnan Provincial Science and Technology
Key Project (No. 2017FA026); Yunnan Ten Thousand Talents Plan Young & Elite Talents Project;
National Natural Science Foundation of China (No. 51404115), Yunnan Ten Thousand Talents Plan
Young & Elite Talents Project. The authors are grateful to the Kunming Key Laboratory of Special
Metallurgy, Kunming Academician Workstation of Advanced Preparation for Super hard Materials
Field, and Kunming Academician Workstation of Metallurgical Process Intensification.
Foundation support by the Yunnan Provincial Science and technology key project (NO.
2017FA026).
References
1. Bhattacharya P, Welch AH, Stollenwerk KG, Mclaughlin MJ, Bundschuh J, Panaullah G (2007)
Arsenic in the environment: biology and chemistry. Sci Total Environ 379(2):109–120
2. Woolson EA, Axley JH, Kearney PC, Woolson EA, Axley JH, Kearney PC (1971) The chemistry and phytotoxicity of arsenic in soils: I. Contaminated field soils. Soil Scisocamerproc
35(6):938–943
3. Papassiopi N, Virˇ ciková E, Nenov V, Kontopoulos A, Molnár L (1996) Removal and fixation
of arsenic in the form of ferric arsenates. Three parallel experimental studies. Hydrometallurgy
41(2–3):243–253
4. Oh C, Rhee S, Oh M, Park J (2012) Removal characteristics of As(III) and As(V) from acidic
aqueous solution by steel making slag. J Hazard Mater 213–214(213–214):147–155
5. Riveros PA, Dutrizac JE, Spencer P (2001) Arsenic disposal practices in the metallurgical
industry. Can Metall Q 40(4):395–420
6. Fei J, Wang T, Zhou Y, Wang Z, Min X, Ke Y, Hu W, Chai L (2018) Aromatic organoarsenic
compounds (AOCs) occurrence and remediation methods. Chemosphere 207:665–675
T. Liao et al.
Conclusion
The conclusions of this study can be drawn as follows. (1) Based on orthogonal
experiment, the influences of four factors A (temperature), B (the reaction time), C
(pH), and D (the molar ratio of Fe/As) on the method of treating as in waste acid by
Fe and CuSO 4 were analyzed, and the reaction time and pH were the main factors
affecting the removal rate of arsenic. The reaction time has a great influence on
the adsorption effect, and pH plays an important role in the displacement reaction,
the adsorption process, and the formation of iron oxides and hydroxides. (2) Based
on the orthogonal experiment, the best process of treating arsenic in waste acid by
adding Fe and CuSO 4 are as follows: temperature was 80 °C, the reaction time was
30 min, pH was 8, and the molar ratio of Fe/As was 8. The removal rate of arsenic
reached 91.73%. (3) By analyzing the main factors obtained through orthogonal
experiment and researching the results of the verification experiment from verified
experiment, the experimental mechanism was further studied. The mechanism was
that CuSO 4 was added, and the substitution reaction occurred between Fe and CuSO 4
to formed Cu. Then, forming Cu–Fe battery to accelerate the corrosion of iron powder
to form Fe(II) and Fe(III) (iron oxides and hydroxides) which adopt adsorption
coprecipitation mechanism is to remove arsenic from waste acid.
Acknowledgements This work was supported by a Yunnan Provincial Science and Technology
Key Project (No. 2017FA026); Yunnan Ten Thousand Talents Plan Young & Elite Talents Project;
National Natural Science Foundation of China (No. 51404115), Yunnan Ten Thousand Talents Plan
Young & Elite Talents Project. The authors are grateful to the Kunming Key Laboratory of Special
Metallurgy, Kunming Academician Workstation of Advanced Preparation for Super hard Materials
Field, and Kunming Academician Workstation of Metallurgical Process Intensification.
Foundation support by the Yunnan Provincial Science and technology key project (NO.
2017FA026).
References
1. Bhattacharya P, Welch AH, Stollenwerk KG, Mclaughlin MJ, Bundschuh J, Panaullah G (2007)
Arsenic in the environment: biology and chemistry. Sci Total Environ 379(2):109–120
2. Woolson EA, Axley JH, Kearney PC, Woolson EA, Axley JH, Kearney PC (1971) The chemistry and phytotoxicity of arsenic in soils: I. Contaminated field soils. Soil Scisocamerproc
35(6):938–943
3. Papassiopi N, Virˇ ciková E, Nenov V, Kontopoulos A, Molnár L (1996) Removal and fixation
of arsenic in the form of ferric arsenates. Three parallel experimental studies. Hydrometallurgy
41(2–3):243–253
4. Oh C, Rhee S, Oh M, Park J (2012) Removal characteristics of As(III) and As(V) from acidic
aqueous solution by steel making slag. J Hazard Mater 213–214(213–214):147–155
5. Riveros PA, Dutrizac JE, Spencer P (2001) Arsenic disposal practices in the metallurgical
industry. Can Metall Q 40(4):395–420
6. Fei J, Wang T, Zhou Y, Wang Z, Min X, Ke Y, Hu W, Chai L (2018) Aromatic organoarsenic
compounds (AOCs) occurrence and remediation methods. Chemosphere 207:665–675