Biochar-activated persulfate for organic contaminants removal: Efficiency, mechanisms and influencing factors

In this experiment quartz sand was chosen as a carrier to be coated by aluminous salt under alkaline condition, and then the specific surface area was tested, and the adsorption capability and Cd2+ removal influencing factors of modified sand were studied. The investigation results showed that the specific surface area of modified sand was 75.244m2/g which was 9.38 times of that of original sand; the removal efficiency of Cd2+ by aluminous salt modified sand reached 59% contrast to 39% of original sand with pH 7.00. It was also found that the removal efficiency of Cd2+ by the aluminous salt modified sand was reduced with the increase of initial concentration of Cd2+ solution, and was enhanced with the increase of pH value, the Cd2+ removal efficiency was almost 71% with pH 9.0.

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Uptake/release of organic contaminants by microplastics: A critical review of influencing factors, mechanistic modeling, and thermodynamic prediction methods

Critical Reviews in Environmental Science and Technology ◽

10.1080/10643389.2020.1856594 ◽

2020 ◽

pp. 1-45

Author(s):

Domenica Mosca Angelucci ◽

M. Concetta Tomei

Keyword(s):

Influencing Factors ◽

Critical Review ◽

Organic Contaminants ◽

Mechanistic Modeling ◽

Prediction Methods ◽

Thermodynamic Prediction

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Persulfate activation by nano zero-valent iron for the degradation of metoprolol in water: influencing factors, degradation pathways and toxicity analysis

RSC Advances ◽

10.1039/d0ra01273d ◽

2020 ◽

Vol 10 (35) ◽

pp. 20991-20999

Author(s):

Yu-qiong Gao ◽

Jia Zhang ◽

Jin-qiang Zhou ◽

Cong Li ◽

Nai-yun Gao ◽

...

Keyword(s):

Influencing Factors ◽

Zero Valent Iron ◽

Degradation Pathways ◽

Toxicity Analysis ◽

Nano Zero Valent Iron ◽

Persulfate Activation ◽

Activated Persulfate

The influencing factors, mechanism and toxicity of MTP degradation by nZVI activated persulfate were investigated.

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Influence of chloride ions on organic contaminants decolorization through the Fe0-activated persulfate oxidation process: efficiency and intermediates

Water Science & Technology ◽

10.2166/wst.2019.303 ◽

2019 ◽

Vol 80 (3) ◽

pp. 563-574 ◽

Cited By ~ 1

Author(s):

Feng Ding ◽

Yong Xie ◽

Tengyan Wu ◽

Na Liu

Keyword(s):

Organic Contaminants ◽

Oxidation Process ◽

Operating Cost ◽

Oxygen Demand ◽

Transformation Products ◽

Chloride Ions ◽

Process Efficiency ◽

Persulfate Oxidation ◽

By Products ◽

Activated Persulfate

Abstract This study was conducted to evaluate the influence of chloride ions (Cl−) on organic contaminants decolorization by the Fe0-activated persulfate process (PS/Fe0), as well as the generation of transformation products. Orange II (OII) was chosen as the target pollution. The results indicated that Cl− influenced the OII decolorization by PS/Fe0 system, resulting in the generation of chlorine-containing by-products. OII containing Cl− solution can be efficiently decolorized by PS/Fe0 process, and the decolorization efficiencies changed depending on Cl− concentration due to the reaction between Cl− and sulfate radicals (SO4–•). The operating cost for 94% color and 64% chemical oxygen demand (COD) removal of the OII dye was estimated at 0.73 USD/m3. The chlorine-containing by-products, such as chlorobenzene, 3,5-dichloro-benzene-1,2-diol, and 2,3-dichloro-2,3-dihydro-1,4-naphthoquinone, were generated during the reaction. The results further indicated that increasing both PS concentration and temperature enhanced OII decolorization and reduced the generation of chlorine-containing intermediates. The addition of ultrasound can further decrease the generation of chlorine-containing intermediates under high-temperature conditions. The proposed pathways of decolorization of OII containing Cl− also indicated that SO4–• dominated the OII degradation, while the presence of Cl− led to the generation of chlorine-containing intermediates.

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