TiO2-SnO2 coated bamboo biochar for electrochemical treatment of coking wastewater

doi:10.11949/0438-1157.20200347

Abstract

Abstract:

A new type of bamboo biochar (BC) loaded TiO₂-SnO₂ particle electrode was prepared and characterized by SEM, FT-IR, BET and XRD for efficient treatment of the coking wastewater in a three-dimensional electrochemical reaction system(3DERs). The results showed that bamboo biochar had a dense microporous space structure, and a significant amount of Ti-Sn oxides existed on the surface and in the interior of the BC. The removal rates of COD and DOC in coking wastewater reached to 73.96% and 66.72% respectively, and UV₂₅₄ reduced from 6.65 cm^-1 to 3.00 cm^-1 by the electrolysis treatment of 150 min at the current density of 30 mA/cm². The three-dimensional fluorescence spectra indicated that the most of the soluble organic compounds and soluble microbial by-products were degraded and transformed. The addition of Ti and Sn enhanced the efficacy of the electrooxidation, electro-adsorption and electrocatalytic behavior of the BC particle electrodes, which improved the treatment effect on coking wastewater in the 3DERs. In addition, this study provides the possibility of basic research for the engineering practice of electrochemical oxidation treatment of coking wastewater.

Key words: particle electrodes, coking wastewater, bamboo biochar, catalysis, electrochemical oxidation

摘要：

制备了一种新型竹制生物炭负载TiO₂-SnO₂的颗粒电极，采用SEM、FT-IR、BET及XRD对其进行表征，并对其在三维电化学系统中处理焦化废水的性能进行了研究。结果表明：竹制生物炭拥有致密的微孔空间结构，改性后其表面和内部存在大量的Ti-Sn氧化物；在电流密度为30 mA/cm²，经过150 min电解处理后，焦化废水的COD去除率达到73.96%，DOC去除率达到66.72%，UV₂₅₄由6.65 cm^-1降至3.00 cm^-1；三维荧光光谱结果表明：焦化废水中大部分有机化合物和可溶性微生物副产物被降解和转化。Ti、Sn的加入提高了颗粒电极电氧化、电吸附和电催化的性能，改善了焦化废水的处理效果。此外，本研究为电化学氧化法处理焦化废水的工程实践提供了基础研究的可能性。

关键词: 颗粒电极, 焦化废水, 竹制生物炭, 催化, 电化学氧化

CLC Number:

X 784

ZHANG Tingting,LIU Yongjun,ZHOU Chengtao,DONG Xin,LIU Jiachen. TiO₂-SnO₂ coated bamboo biochar for electrochemical treatment of coking wastewater[J]. CIESC Journal, 2020, 71(12): 5793-5801.

张婷婷,刘永军,周成涛,董欣,刘嘉晨. 竹制生物炭负载TiO₂-SnO₂电化学处理焦化废水[J]. 化工学报, 2020, 71(12): 5793-5801.

Figures/Tables 9

Fig.1 Preparation process of the particle electrodes

Fig.2 Schematic of the three-dimensional electrode reactor

Fig.3 Microstructure of particle electrodes

Table 1 Specific surface area and pore volume of particle electrodes

Sample	S_BET/(m²/g)	V_p/(m³/g)
BC	257.89	0.167
Ti-Sn/BC	20.62	0.031

Fig.4 EDS of particle electrodes

Fig.5 XRD patterns of particle electrodes

Fig.6 FT-IR spectra of particle electrodes

Fig.7 Treatment of the coking wastewater by using different molar ratio of Ti∶Sn particle electrodes

Fig.8 Three - dimensional fluorescence spectra of coking wastewater treated by the 3DERs

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TiO₂-SnO₂ coated bamboo biochar for electrochemical treatment of coking wastewater

竹制生物炭负载TiO₂-SnO₂电化学处理焦化废水

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References 36

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