Remediation of azodye contaminated soil by Electrokinetics

IF 6.3 3区工程技术 Q1 ENGINEERING, CHEMICAL Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-01-01 DOI:10.1016/j.jtice.2023.105262

Selvakumar Santhosh , Subramani Abilaji , Mohamad S AlSalhi , Sandhanasamy Devanesan , Jayaraman Narenkumar , Rajaram Rajamohan , Aruliah Rajasekar

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Abstract

Background

An in situ electrokinetic remediation (EK) method was employed for the effective removal of the azo dye in the contaminated soil. Besides, the catalysts sodium chloride and potassium sulphate were evaluated for the total removal efficiency of pollutant in the soil

Methods

The direct current (10 V/cm⁻¹) was selected for EK (56 h) and the ruthenium oxide (RuO₂) and titanium oxide (TiO₂) as anode and cathode materials respectively.The soil was spiked with 100 mg/kg of azo dyes namely congo red, methylene blue, methylene red and trypan blue.

Significant findings

The UV spectrum reveals that the higher concentration of pollutant in the cathode than anode insodium chloride (NaCl) catalyst. Chemical oxygen demand was achieved in the NaCl (82%) than potassium sulphate (62 %). The higher removal rate of the dye was observed in the NaCl, which was due to the active chlorine generation and breakdown the dye. FTIR confirms the breakdown of the azo dye during the EK. Plant growth (vicia faba)in the treated soil resulted in well germination when compared to untreated soil due to the lesser toxic pollutant present in the soil. Overall, this study concluded that EK techniques are promising method combined with sodium chloride for the effective removal of the azo dyes.

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利用电动力学修复受偶氮染料污染的土壤

背景采用原位电动力学修复（EK）法对污染土壤中的偶氮染料进行了有效去除。此外，考察了氯化钠和硫酸钾催化剂对土壤中污染物的总去除率。方法选择直流电（10 V/cm−1）为EK (56 h)，氧化钌（RuO2）和氧化钛（TiO2）分别作为阳极和阴极材料。在土壤中添加100 mg/kg偶氮染料，即刚果红、亚甲基蓝、亚甲基红和台苯蓝。结果表明：氯化钠（NaCl）催化剂的阴极污染物浓度高于阳极污染物浓度。NaCl（82%）比硫酸钾（62%）达到化学需氧量。在NaCl中，染料的去除率较高，这是由于活性氯的生成和染料的分解。红外光谱证实了偶氮染料在EK过程中的分解。与未经处理的土壤相比，处理过的土壤中的植物生长（蚕豆）发芽良好，因为土壤中存在的有毒污染物较少。综上所述，本研究认为EK技术与氯化钠相结合是有效去除偶氮染料的有效方法。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.