In this work,LED-based photocatalysis using mixed rutile and anatase phase TiO_(2)(P25)as the photocatalyst could effectively remove 5-chloro-2-methyl-4-isothiazolin-3-one(CMIT)and methylisothiazolone(MIT)simultaneous...In this work,LED-based photocatalysis using mixed rutile and anatase phase TiO_(2)(P25)as the photocatalyst could effectively remove 5-chloro-2-methyl-4-isothiazolin-3-one(CMIT)and methylisothiazolone(MIT)simultaneously,with removal efficiencies above 80%within 20 min.The photocatalytic degradation of both CMIT and MIT could be modeled using a pseudo-first-order rate equation.The photocatalytic degradation rates of CMIT and MIT under LED280 illumination were higher than under LED310 or LED360 illumination.At concentrations below 100 mg/L,the degradation rate of CMIT and MIT under LED illumination significantly increased with increasing catalyst dosage.Additionally,the effects of the chloride ion concentration,alkalinity and dissolved organic matter on the photocatalytic degradation reaction were also investigated.The·OH free radicals were determined to play the primary role in the photocatalytic degradation reaction,with a degradation contribution of>95%.The photocatalytic degradation of CMIT and MIT mainly occurred via oxidation,hydrolysis,and chain growth reactions.Finally,the possible photocatalytic degradation pathways of CMIT and MIT over LED/P25 are proposed.展开更多
To develop highly effective adsorbents for chromium removal,a nitrogen-doped biomass-derived carbon(NHPC)was synthesized via direct carbonation of loofah sponge followed by alkali activation and doping modification.NH...To develop highly effective adsorbents for chromium removal,a nitrogen-doped biomass-derived carbon(NHPC)was synthesized via direct carbonation of loofah sponge followed by alkali activation and doping modification.NHPC possessed a hierarchical micro-/mesoporous lamellar structure with nitrogen-containing functional groups(1.33 at%),specific surface area(1792.47 m2/g),and pore volume(1.18 cm^(3)/g).NHPC exhibited a higher Cr(Ⅵ)adsorption affinity than the HPC(without nitrogen doping)or the pristine loofah sponge carbon(LSC)did.The influence of process parameters,including pH,dosage,time,temperature,and Cr(Ⅵ)concentration,on Cr(Ⅵ)adsorption by NHPC were evaluated.The Cr(Ⅵ)adsorption kinetics matched with the pseudo-second-order model(R^(2)≥0.9983).The Cr(Ⅵ)adsorption isotherm was fitted with the Langmuir isotherm model,which indicated the maximum Cr(Ⅵ)adsorption capacities:227.27,238.10,and 285.71 mg/g at 298K,308K,and 318K,respectively.The model analysis also indicated that adsorption of Cr(Ⅵ)on NHPC was a spontaneous,endothermal,and entropy-increasing process.The Cr(Ⅵ)adsorption process potentially involved mixed reductive and adsorbed mechanism.Furthermore,computational chemistry calculations revealed that the adsorption energy between NHPC and Cr(VI)(-0.84 eV)was lower than that of HPC(-0.51 eV),suggesting that nitrogen doping could greatly enhance the interaction between NHPC and Cr(VI).展开更多
At present,endometriosis remains a worldwide health burden,with the main symptoms of dysmenorrhea,chronic pelvic pain,and infertility,markedly reducing the quality of life(de Ziegler et al.,2010).Although there is no ...At present,endometriosis remains a worldwide health burden,with the main symptoms of dysmenorrhea,chronic pelvic pain,and infertility,markedly reducing the quality of life(de Ziegler et al.,2010).Although there is no proof that the disease is associated with high mortality,this disorder can significantly contribute to the deterioration of women’s general well-being(McPeak et al.,2018).展开更多
基金the Major Science and Technology Program for Water Pollution Control and Treatment,China(No.2017ZX07205001)the Shenzhen Science and Technology Innovation Commission(No.JCYJ20160125095838752)the Development and Reform Commission of Shenzhen Municipality(Urban Water Recycling and EnvironmentSafety Program).
文摘In this work,LED-based photocatalysis using mixed rutile and anatase phase TiO_(2)(P25)as the photocatalyst could effectively remove 5-chloro-2-methyl-4-isothiazolin-3-one(CMIT)and methylisothiazolone(MIT)simultaneously,with removal efficiencies above 80%within 20 min.The photocatalytic degradation of both CMIT and MIT could be modeled using a pseudo-first-order rate equation.The photocatalytic degradation rates of CMIT and MIT under LED280 illumination were higher than under LED310 or LED360 illumination.At concentrations below 100 mg/L,the degradation rate of CMIT and MIT under LED illumination significantly increased with increasing catalyst dosage.Additionally,the effects of the chloride ion concentration,alkalinity and dissolved organic matter on the photocatalytic degradation reaction were also investigated.The·OH free radicals were determined to play the primary role in the photocatalytic degradation reaction,with a degradation contribution of>95%.The photocatalytic degradation of CMIT and MIT mainly occurred via oxidation,hydrolysis,and chain growth reactions.Finally,the possible photocatalytic degradation pathways of CMIT and MIT over LED/P25 are proposed.
基金funded by the National Natural Science Foundation of China(Grant No.41872169)the Project of Education Department of Henan Province(No.21A610002)the Innovation and entrepreneurship training plan for college students of Henan Province in 2020(No.S202011517004)。
文摘To develop highly effective adsorbents for chromium removal,a nitrogen-doped biomass-derived carbon(NHPC)was synthesized via direct carbonation of loofah sponge followed by alkali activation and doping modification.NHPC possessed a hierarchical micro-/mesoporous lamellar structure with nitrogen-containing functional groups(1.33 at%),specific surface area(1792.47 m2/g),and pore volume(1.18 cm^(3)/g).NHPC exhibited a higher Cr(Ⅵ)adsorption affinity than the HPC(without nitrogen doping)or the pristine loofah sponge carbon(LSC)did.The influence of process parameters,including pH,dosage,time,temperature,and Cr(Ⅵ)concentration,on Cr(Ⅵ)adsorption by NHPC were evaluated.The Cr(Ⅵ)adsorption kinetics matched with the pseudo-second-order model(R^(2)≥0.9983).The Cr(Ⅵ)adsorption isotherm was fitted with the Langmuir isotherm model,which indicated the maximum Cr(Ⅵ)adsorption capacities:227.27,238.10,and 285.71 mg/g at 298K,308K,and 318K,respectively.The model analysis also indicated that adsorption of Cr(Ⅵ)on NHPC was a spontaneous,endothermal,and entropy-increasing process.The Cr(Ⅵ)adsorption process potentially involved mixed reductive and adsorbed mechanism.Furthermore,computational chemistry calculations revealed that the adsorption energy between NHPC and Cr(VI)(-0.84 eV)was lower than that of HPC(-0.51 eV),suggesting that nitrogen doping could greatly enhance the interaction between NHPC and Cr(VI).
基金supported by the Natural Science Foundation of Zhejiang Province(No.LGF20H040009),China。
文摘At present,endometriosis remains a worldwide health burden,with the main symptoms of dysmenorrhea,chronic pelvic pain,and infertility,markedly reducing the quality of life(de Ziegler et al.,2010).Although there is no proof that the disease is associated with high mortality,this disorder can significantly contribute to the deterioration of women’s general well-being(McPeak et al.,2018).
