Boron regulates catalytic sites of biochar to enhance the formation of surface-confined complex for improved peroxydisulfate activation
Boron regulates catalytic sites of biochar to enhance the formation of surface-confined complex for improved peroxydisulfate activation
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DOI：
10.1016/j.chemosphere.2022.134690
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发表时间：
2022-04-30
期刊：
影响因子：
8.8
通讯作者：
Xu, Juan
中科院分区：
文献类型：
--
作者：
Chen, Chen;Zhou, Lu-Lu;Xu, Juan
生物炭因其碳质、易得、价廉等特点，被开发用于活化过硫酸盐处理废水。有效的活性位点和界面电子转移是非常需要的过二硫酸盐（PDS）活化。本研究证实硼掺杂生物炭的硼酸酯结构和缺陷程度是提高PDS活性的活性位点。污染物的降解性能被证明与两个激活位点的结构-活性关系。此外，硼掺杂的生物炭通过形成表面限制的络合物，促进电子从污染物到络合物的转移，表现出更高的稳定性和氧化电位。优化后的掺硼生物炭具有适应pH范围宽（2.9-10.0）、抗Cl（-）和有机物能力强、活化能低（11.22 kJ mol（-1））的优点，可实现实际印染废水的降解。我们的工作为通过杂原子掺杂调控生物炭的界面催化活性提供了一条新的途径。
Biochar has been developed to activate persulfate for wastewater treatment due to its carbon essence, easily available and low-cost. Efficiently active sites and interfacial electron transfer are highly desired for peroxydisulfate (PDS) activation. In this study, boronic ester structure and defect degree of boron-doped biochar are confirmed as activate sites to improve PDS activation. The performance of pollutants degradation is proven to have structure-activity relationships with both activate sites. Moreover, boron-doped biochar exhibits higher stability and oxidation potential by forming the surface-confined complex, promoting electron transfer from pollutants to complex. The optimized boron-doped biochar has the advantages of adapting to a broad pH range (2.9-10.0), strong resistance to Cl(- )and organic matters, a low activation energy of 11.22 kJ mol(-1), and achieving the decomposition of practical dyeing wastewater. Our work provides a promising approach to regulating the interfacial catalytic sites of biochar by doping heteroatom for PDS activation in practical wastewater treatment.