Degradation of printing and dyeing wastewater by modified biochar catalyzed persulfate

Feng Ding,Tengyan Wu,Zichen Luo,Zi Xiao,Hongbin Zhong

doi:10.1051/e3sconf/201911804040

Feng Ding, Tengyan Wu + Show 3 more

Open Access

https://doi.org/10.1051/e3sconf/201911804040

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Abstract

The biochar (BC) obtained from banana peel was used to catalyze persulfate (PS) to degrade the Direct Blue 86 (DB86) simulating and dyeing wastewater, which can obtain a much better degradation efficiency (71.1% within 1440 min) compared with BC (insignificant) or PS (26.7%) alone. Then BC was modified, and the influence of modified method, PS concentration, biochar content and temperature on DB86 degradation was also investigated. Results showed that the acid modified method of BC had advantage for the DB86 degradation, and 99% decolorization efficiency can reach within 240 min. The degradation of DB86 increased with PS concentration increasing, and then decreased slowly. Increasing the acid modified BC dosage and temperature can improve effectively the DB86 degradation. When the experimental conditions are PS 5×10-3 M, acid modified BC 5.0 g/L, and 25°C, the degradation of DB86 can reach 99% within 60 min.

Highlights

With the development of society, the protection of environment is receiving more and more recognition
The acidic groups increasing may lead to the enhancement of catalytic property of acid modified biochar (ACBC)
BC can effectively activate persulfate to degrade Direct Blue 86 (DB86), and the degradation of DB86 can be further enhanced after the BC was modified by sulfate acid

Summary

Introduction

With the development of society, the protection of environment is receiving more and more recognition. The treatment method of dyeing and printing wastewater degradation to reach the emission standard has caused the interests of scientists. Advanced oxidation processes (AOPs) can degrade and mineralize organic pollutants efficiently, which have widely been applied in dyeing and printing wastewater treatment [3,4,5,6]. Among AOPs methods, persulfate oxidation process is considered as an environmental friendly oxidant, which has some advantages, such as prince moderate and easier to store and transport. Metal ions are the mainly catalyst to introduce PS, the reuse and the toxicity of the metal catalysts, as well as the associated secondary contamination to the environment, pose some challenges in such homogeneous oxidation processes

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Conclusion