竹制生物炭负载TiO2-SnO2电化学处理焦化废水

doi:10.11949/0438-1157.20200347

化工学报 ›› 2020, Vol. 71 ›› Issue (12): 5793-5801.DOI: 10.11949/0438-1157.20200347

竹制生物炭负载TiO₂-SnO₂电化学处理焦化废水

张婷婷¹(),刘永军^1,²(),周成涛^3,⁴,董欣⁴,刘嘉晨⁴

^1.西安建筑科技大学环境与市政工程学院，陕西西安 710055
^2.西安建筑科技大学西北水资源与环境生态教育部重点实验室，陕西西安 710055
^3.中铁二十局集团第六工程有限公司，陕西西安 710032
^4.内蒙古科技大学，内蒙古包头 014010

收稿日期:2020-04-01 修回日期:2020-06-04 出版日期:2020-12-05 发布日期:2020-12-05
通讯作者: 刘永军
作者简介:张婷婷（1987—），女，博士研究生，tingtingzhang999@163.com
基金资助:
国家自然科学基金项目(51978559);陕西省重点研发项目(2019ZDLSF05-06)

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

ZHANG Tingting¹(),LIU Yongjun^1,²(),ZHOU Chengtao^3,⁴,DONG Xin⁴,LIU Jiachen⁴

^1.School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China
^2.Key Laboratory of Northwest Water Resource, Ecology and Environment, Ministry of Education, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China
^3.No. 6 Engineering Corporation Limited of CR20G, Xi’an 710032, Shaanxi, China
^4.Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China

Received:2020-04-01 Revised:2020-06-04 Online:2020-12-05 Published:2020-12-05
Contact: LIU Yongjun

摘要/Abstract

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

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

中图分类号:

X 784

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.

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.

图/表 9

图1 颗粒电极的制备流程a—BC; b—Ti-Sn/BC

Fig.1 Preparation process of the particle electrodes

图2 三维电化学反应装置图

Fig.2 Schematic of the three-dimensional electrode reactor

图3 颗粒电极结构

Fig.3 Microstructure of particle electrodes

表1 粒子电极的比表面积和孔隙体积

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

图4 颗粒电极的EDS图

Fig.4 EDS of particle electrodes

图5 颗粒电极的XRD谱图

Fig.5 XRD patterns of particle electrodes

图6 颗粒电极的FT-IR谱图

Fig.6 FT-IR spectra of particle electrodes

图7 不同Ti∶Sn摩尔比颗粒电极处理焦化废水的效果

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

图8 三维电化学系统处理焦化废水的三维荧光光谱图

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

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竹制生物炭负载TiO₂-SnO₂电化学处理焦化废水

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

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