双阴极系统高效连续流电子芬顿处理抗生素废水,ACS Sustainable Chemistry & Engineering

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双阴极系统高效连续流电子芬顿处理抗生素废水
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-01-14 , DOI: 10.1021/acssuschemeng.0c08705
Haifang Tang ₁ , Zuoyan Zhu ₂ , Qian Shang ₂ , Yanhong Tang ₁ , Danyu Zhang ₂ , Yi Du ₂ , Meijun Liu ₂ , Kai Yin ₂ , Chengbin Liu ₂

Affiliation

对于EF的实际应用，非常需要一种简单，高效且环保的电子芬顿（EF）工艺。在本文中，实用性高的双阴极EF系统已经开发：（1）KOH活化的石墨毡（AGF）用于h ₂ ö ₂为h生产和（2）FeOCl改性碳布（FeOCl / CC）₂ ö ₂激活。AGF阴极在60分钟内产生的H ₂ O ₂达到3.4 mmol / L（pH 3，-0.6 V，相对于Ag / AgCl），FeOCl / CC阴极显示出优异的H ₂ O ₂活化性能，其中去除率的四环素（TC，一种难降解的有机污染物）在5分钟内达到[98.2％（[H ₂ O₂ ] = 1.0 mmol / L，C ₀ = 10.0 mg / L，pH 3，相对于Ag / AgCl为-0.8 V）。TC降解证明了双阴极EF系统。静态中TC的去除率在20分钟内达到96％，总有机碳（TOC）去除率在2小时内达到92％（相对于Ag / AgCl，C ₀ = 10.0 mg / L，pH 5和-0.6 V）系统。此外，该系统在3至7的宽pH范围内都非常有效。重要的是，在连续流系统中，TC降解百分率在1.5 h内达到95％，矿化在4 h内达到88％（C ₀ = 10.0毫克/ L，v= 4 mL / min，pH 5，相对于Ag / AgCl为-0.6 V），即使延长15 h，性能仍保持高度稳定。该系统具有高氧化通量（1510 mg /（min m ²））和低能耗（45 kWh /（kg TOC））。令人鼓舞的是，这样的小型反应器（V = 100 mL，4 mL / min）一天即可处理5.76 L的TC废水。EF处理后，TC溶液的毒性显着降低。这项研究将促进EF治疗过程的实际应用。

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Highly Efficient Continuous-Flow Electro-Fenton Treatment of Antibiotic Wastewater Using a Double-Cathode System

A simple, efficient, and environmentally friendly electro-Fenton (EF) process is highly demanded for EF practical application. Herein, a highly practical double-cathode EF system has been developed: (1) KOH-activated graphite felt (AGF) for H₂O₂ production and (2) FeOCl-modified carbon cloth (FeOCl/CC) for H₂O₂ activation. The H₂O₂ production at the AGF cathode reaches 3.4 mmol/L in 60 min (pH 3, −0.6 V vs Ag/AgCl), and the FeOCl/CC cathode shows an excellent H₂O₂ activation performance where the removal percentage of tetracycline (TC, a rising refractory organic pollutant) reaches 98.2% in 5 min ([H₂O₂] = 1.0 mmol/L, C₀ = 10.0 mg/L, pH 3, and −0.8 V vs Ag/AgCl). The double-cathode EF system is proved by TC degradation. The removal percentage of TC achieves 96% in 20 min and total organic carbon (TOC) removal percentage reaches 92% in 2 h (C₀ = 10.0 mg/L, pH 5, and −0.6 V vs Ag/AgCl) in a static system. Furthermore, the system is highly effective in a wide pH range from 3 to 7. Significantly, in the continuous-flow system, the TC degradation percentage reaches 95% within 1.5 h, the mineralization reaches 88% within 4 h (C₀ = 10.0 mg/L, v = 4 mL/min, pH 5, and −0.6 V vs Ag/AgCl), and the performance remains highly stable even after prolonging for 15 h. The system has a high oxidative flux (1510 mg/(min m²)) and low energy consumption (45 kWh/(kg TOC)). Encouragingly, such a small-scale reactor (V = 100 mL, 4 mL/min) can treat 5.76 L of TC wastewater in one day. The toxicity of TC solution is remarkably reduced after EF treatment. This study would advance the practical application of an EF treatment process.

更新日期：2021-01-25

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