Carbon-mediated persulfate advanced oxidation processes(PS-AOPs)are appealing in contaminant remediation.For the first time,S,B-co-doped carbon-based persulfate activators were synthesized through direct carbonization...Carbon-mediated persulfate advanced oxidation processes(PS-AOPs)are appealing in contaminant remediation.For the first time,S,B-co-doped carbon-based persulfate activators were synthesized through direct carbonization of sodium lignosulfonate and boric acid.By degrading sulfamethoxazole(SMX),CSB-750 obtained 98.7%removal and 81.4%mineralization within 30 min.In comparison with solo S or B doping,S and B co-doped carbon showed the coupling effect for enhanced catalysis.The rate constant(kobs)of 0.1679 min^(-1)was 22.38-and 279.83-fold higher than those of CS-750(0.0075 min^(-1))and CB-750(0.0006 min^(-1)),respectively.The degradation was efficient at strong acidic and weak basic conditions(pH 3-9).Substantial inhibition effect was presented at strong basic condition(pH 10.95)and in presence of CO_(3)^(2-).The CO_(3)^(2-)-caused inhibition was the combined result of the cooperation of pH and quenching O_(2)^(·-).Thiophene sulfur,BC_(3),BC_(2)O,and structural defects were identified as the active sites for PS activation.Radical and nonradical pathways were both involved in the CSB-750/PS/SMX system,where^(1)O_(2)dominated the degradation,SO_(4)^(·-),·OH and direct electron transfer played the subordinate role,and O_(2)^(·-)served as a precursor for the formation of partial^(1)O_(2).The toxicity of degradation system,the effect of real water matrix,and the reusability of carbocatalysts were comprehensively analyzed.Nine possible degradation pathways were proposed.This work focuses on the catalytic performance improvement through the coupling effect of S,B co-doping,and develops an advanced heteroatom doping system to fabricate carbonaceous persulfate activators.展开更多
近年来,锌离子电容器(ZIHCs)因其环境友好性和优异的电化学性能而备受关注。然而,ZIHCs的研究体系尚不成熟,为改善ZIHCs的储能动力学和循环稳定性等问题,亟需研发出低成本和高性能的碳基电极材料。本工作以海藻酸钠为碳前驱体,五硼酸铵...近年来,锌离子电容器(ZIHCs)因其环境友好性和优异的电化学性能而备受关注。然而,ZIHCs的研究体系尚不成熟,为改善ZIHCs的储能动力学和循环稳定性等问题,亟需研发出低成本和高性能的碳基电极材料。本工作以海藻酸钠为碳前驱体,五硼酸铵为氮源和硼源,采用一步水热活化策略合成了氮/硼含量较高的分级多孔炭(NBSPC)。这种策略可以有效重塑炭的多孔结构,产生大量的活性位点,贡献额外的赝电容,从而提高其电化学性能。以NBSPC为正极构建了锌离子电容器,其在40 A g^(-1)的超高电流密度下,可以实现85.4 mAh g^(-1)优异的倍率性能,并在10 A g^(-1)的电流密度下可以稳定循环15000次,容量保持率高达94.5%。展开更多
Titanium dioxide co-doped with N and B was prepared by sol-gel method. The photocatalytic activity was evaluated by the photodegradation of methylene blue under visible light. Its physicochemical properties were chara...Titanium dioxide co-doped with N and B was prepared by sol-gel method. The photocatalytic activity was evaluated by the photodegradation of methylene blue under visible light. Its physicochemical properties were characterized by means of UV-Vis DRS, XRD, PT-IR, and XPS. The results indicated that N-B-TiO2 has good activity to the photodegradation of MB. Its decolourizing rate of methylene blue solution goes up to 98.4% under the visible light irradiation with 5 h. The doping nitrogen forms N-Ti-O and boron primarily existing in oxide appears in the N-B-TiO2 sample. They response for visible light of TiOa was also exploited.展开更多
采用水热法制备硼硫(B/S)共掺杂纳米二氧化钛(B-S-TiO_2),并配制成浆料,利用丝网印刷技术在FTO导电玻璃上制备B-S-TiO_2薄膜;用化学浴沉积(CBD)法制备了CdS量子点敏化B-S-TiO_2薄膜电极,并用X射线衍射(XRD)、电子显微镜(TEM)、元素分析...采用水热法制备硼硫(B/S)共掺杂纳米二氧化钛(B-S-TiO_2),并配制成浆料,利用丝网印刷技术在FTO导电玻璃上制备B-S-TiO_2薄膜;用化学浴沉积(CBD)法制备了CdS量子点敏化B-S-TiO_2薄膜电极,并用X射线衍射(XRD)、电子显微镜(TEM)、元素分析能谱(EDS)和紫外–可见光谱对其进行表征分析;结果显示:B/S共掺杂不会改变TiO_2的晶型,掺杂后的TiO_2吸收边带发生明显红移,吸收强度显著增强;同样用化学浴沉积的方法制备Ni S工作电极,用改性的聚硫化物((CH3)4N)2S/((CH3)4N)2Sn)电解液,组装CdS量子点敏化硼硫(B/S)共掺杂纳米二氧化钛(B-S-TiO_2)太阳能电池,并测试电池光电性能。测试结果表明,在AM1.5G的照射下,电池的能量转化效率(η)由3.21%增大到3.69%,提高了14.9%,电池获得高达(Voc)1.218 V的开路电压和3.42 m A/cm2的短路光电流(Jsc),以及高达88.7%的填充因子(ff)。展开更多
基金financially supported by the GuangDong Basic and Applied Basic Research Foundation(Nos.2019A1515110649,2020A1515110271,2019A1515110244)the National Natural,Science Fund of China(No.51908127)+1 种基金the Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme(2017)the Research Team in Dongguan University of Technology(No.TDYB2019013)。
文摘Carbon-mediated persulfate advanced oxidation processes(PS-AOPs)are appealing in contaminant remediation.For the first time,S,B-co-doped carbon-based persulfate activators were synthesized through direct carbonization of sodium lignosulfonate and boric acid.By degrading sulfamethoxazole(SMX),CSB-750 obtained 98.7%removal and 81.4%mineralization within 30 min.In comparison with solo S or B doping,S and B co-doped carbon showed the coupling effect for enhanced catalysis.The rate constant(kobs)of 0.1679 min^(-1)was 22.38-and 279.83-fold higher than those of CS-750(0.0075 min^(-1))and CB-750(0.0006 min^(-1)),respectively.The degradation was efficient at strong acidic and weak basic conditions(pH 3-9).Substantial inhibition effect was presented at strong basic condition(pH 10.95)and in presence of CO_(3)^(2-).The CO_(3)^(2-)-caused inhibition was the combined result of the cooperation of pH and quenching O_(2)^(·-).Thiophene sulfur,BC_(3),BC_(2)O,and structural defects were identified as the active sites for PS activation.Radical and nonradical pathways were both involved in the CSB-750/PS/SMX system,where^(1)O_(2)dominated the degradation,SO_(4)^(·-),·OH and direct electron transfer played the subordinate role,and O_(2)^(·-)served as a precursor for the formation of partial^(1)O_(2).The toxicity of degradation system,the effect of real water matrix,and the reusability of carbocatalysts were comprehensively analyzed.Nine possible degradation pathways were proposed.This work focuses on the catalytic performance improvement through the coupling effect of S,B co-doping,and develops an advanced heteroatom doping system to fabricate carbonaceous persulfate activators.
文摘近年来,锌离子电容器(ZIHCs)因其环境友好性和优异的电化学性能而备受关注。然而,ZIHCs的研究体系尚不成熟,为改善ZIHCs的储能动力学和循环稳定性等问题,亟需研发出低成本和高性能的碳基电极材料。本工作以海藻酸钠为碳前驱体,五硼酸铵为氮源和硼源,采用一步水热活化策略合成了氮/硼含量较高的分级多孔炭(NBSPC)。这种策略可以有效重塑炭的多孔结构,产生大量的活性位点,贡献额外的赝电容,从而提高其电化学性能。以NBSPC为正极构建了锌离子电容器,其在40 A g^(-1)的超高电流密度下,可以实现85.4 mAh g^(-1)优异的倍率性能,并在10 A g^(-1)的电流密度下可以稳定循环15000次,容量保持率高达94.5%。
基金supported by the National Natural Science Foundation of China (No. 20771024)the Science and Technology Project of Fujian Province (Nos. 2007J0359, 2006F5030)
文摘Titanium dioxide co-doped with N and B was prepared by sol-gel method. The photocatalytic activity was evaluated by the photodegradation of methylene blue under visible light. Its physicochemical properties were characterized by means of UV-Vis DRS, XRD, PT-IR, and XPS. The results indicated that N-B-TiO2 has good activity to the photodegradation of MB. Its decolourizing rate of methylene blue solution goes up to 98.4% under the visible light irradiation with 5 h. The doping nitrogen forms N-Ti-O and boron primarily existing in oxide appears in the N-B-TiO2 sample. They response for visible light of TiOa was also exploited.
文摘采用水热法制备硼硫(B/S)共掺杂纳米二氧化钛(B-S-TiO_2),并配制成浆料,利用丝网印刷技术在FTO导电玻璃上制备B-S-TiO_2薄膜;用化学浴沉积(CBD)法制备了CdS量子点敏化B-S-TiO_2薄膜电极,并用X射线衍射(XRD)、电子显微镜(TEM)、元素分析能谱(EDS)和紫外–可见光谱对其进行表征分析;结果显示:B/S共掺杂不会改变TiO_2的晶型,掺杂后的TiO_2吸收边带发生明显红移,吸收强度显著增强;同样用化学浴沉积的方法制备Ni S工作电极,用改性的聚硫化物((CH3)4N)2S/((CH3)4N)2Sn)电解液,组装CdS量子点敏化硼硫(B/S)共掺杂纳米二氧化钛(B-S-TiO_2)太阳能电池,并测试电池光电性能。测试结果表明,在AM1.5G的照射下,电池的能量转化效率(η)由3.21%增大到3.69%,提高了14.9%,电池获得高达(Voc)1.218 V的开路电压和3.42 m A/cm2的短路光电流(Jsc),以及高达88.7%的填充因子(ff)。
