The novel magnetic sepiolite/Fe_(3)O_(4)/zero-valent iron(nZVI)nanocomposite(nZVI@SepH-Mag)was prepared and used to achieve the removal of Cr(VI)in this work.The nZVI@SepH-Mag composites were characterized by XRD,FTIR...The novel magnetic sepiolite/Fe_(3)O_(4)/zero-valent iron(nZVI)nanocomposite(nZVI@SepH-Mag)was prepared and used to achieve the removal of Cr(VI)in this work.The nZVI@SepH-Mag composites were characterized by XRD,FTIR,BET,SEM and TEM.The characterization results indicated that the structure of the composite consisted of small nanoscale nZVI and magnetite(Mag)particles uniformly anchoring on the surface of acid-activated sepiolite(SepH).Batch experiments were used to analyze the effects of main factors on Cr(VI)removal.A 100%removal efficiency in 60 min and enhanced reaction ratio were reached by the composite comparing other existing materials.The kinetic of the adsorption and possible Cr(VI)removal mechanism of the hybrids were also evaluated and proposed.Based on the removal products identified by Raman,XRD and XPS,a reduction mechanism was proposed.The results indicated that the SepH and Mag can inhibit the agglomeration and enhance the dispersibility of nZVI,and Mag and nZVI displayed good synergetic effects.展开更多
As a decorative material, magnesium oxychloride cement was used as a photocatalyst supporter to purify the pollutants indoors. Due to excellent adsorption properties of activated carbon（AC）, the photocatalytic compo...As a decorative material, magnesium oxychloride cement was used as a photocatalyst supporter to purify the pollutants indoors. Due to excellent adsorption properties of activated carbon（AC）, the photocatalytic composties, TiO2/AC, were prepared and introduced into the porous magnesium oxychloride cement（PMOC） substrate to composite a sort of photocatalytic cementitious material（PCM）. The optimal composite processes were assessed by gas chromatograph, using toluene as the target. By comparing the perspective of toluene purification and thorough decomposition, it can be found that the optimal mass ratio for TiO2/AC composites is 4/25, and the heat treatment to TiO2/AC sample at 350 ℃ can play the optimal synergetic role of adsorbents in photocatalytic process. The synergistic effect of TiO2, AC and magnesium oxychloride cement（MOC） was also evaluated by gas chromatograph. One-take molding process was adopted to introduce the TiO2/AC into PMOC substrate, and its optimal mass fraction was 4 wt%, while the appropriate density of substrate was 0.35 g/cm3. Toluene degradation showed that the prepared PCM can degrade pollutants efficiently. The appropriate treatment process of TiO2/AC, mass of TiO2/AC, substrate density, and stable pore structure should be coordinated to maximize the adsorption-photodegradation performance. The combination of photocatalytic materials, adsorbents, and building materials provided a new idea for the application of photocatalysis.展开更多
With the development of the coal chemical industry,the emission of coal gasification slag(CGS)has grown rapidly,raising widespread concerns about environmental pollution and resource waste.The composition and structur...With the development of the coal chemical industry,the emission of coal gasification slag(CGS)has grown rapidly,raising widespread concerns about environmental pollution and resource waste.The composition and structural characteristics of CGS,such as high contents of carbon,silicon,and aluminum and well-developed pores,enable the preparation of CGS-based adsorbent materials for wastewater treatment and gas purification,thus promoting high-value resource utilization of CGS and achieving the goal of“treating waste with waste.”On the basis of the compositional and structural characteristics of CGS being summarized in this review,the preparation methods of CGS-based adsorbent materials,such as activated carbon,zeolite,mesoporous silica,and carbon-silica composites,are systematically outlined as well as their preparation mechanisms are deeply elucidated.Then,the current application status and adsorption mechanisms of various types of CGS-based adsorbent materials in the fields of wastewater treatment and gas purification,such as heavy-metal removal,nitrate removal,ammonia-nitrogen removal,dye removal,CO_(2)absorption,and pollutant adsorption-catalytic degradation,are fully discussed.Finally,bottlenecks and key research directions in the preparation of highvalue-added adsorbent materials from CGS are summarized and prospected.This review is of significant relevance in promoting the product development and industrial application of CGS in the field of adsorption.展开更多
CONSPECTUS:As a simple and common physicochemical process,adsorption is the basis of storage,separation,and many other applications.Compared to conventional adsorbents,molecule-based crystalline materials show advanta...CONSPECTUS:As a simple and common physicochemical process,adsorption is the basis of storage,separation,and many other applications.Compared to conventional adsorbents,molecule-based crystalline materials show advantages of extremely rich and easily designable/synthesized/characterized structures as well as remarkable flexibility.The emergence of new adsorbent materials has brought forth both opportunities and challenges for adsorption theory and its applications.展开更多
基金Projects(52474138,52104261,52525401)supported by the National Natural Science Foundation of ChinaProject supported by the New Cornerstone Science Foundation through the XPLORER PRIZE,ChinaProject supported by the Shanxi Key Laboratory Funds of Mine Rock Strata Control and Disaster Prevention,China。
文摘The novel magnetic sepiolite/Fe_(3)O_(4)/zero-valent iron(nZVI)nanocomposite(nZVI@SepH-Mag)was prepared and used to achieve the removal of Cr(VI)in this work.The nZVI@SepH-Mag composites were characterized by XRD,FTIR,BET,SEM and TEM.The characterization results indicated that the structure of the composite consisted of small nanoscale nZVI and magnetite(Mag)particles uniformly anchoring on the surface of acid-activated sepiolite(SepH).Batch experiments were used to analyze the effects of main factors on Cr(VI)removal.A 100%removal efficiency in 60 min and enhanced reaction ratio were reached by the composite comparing other existing materials.The kinetic of the adsorption and possible Cr(VI)removal mechanism of the hybrids were also evaluated and proposed.Based on the removal products identified by Raman,XRD and XPS,a reduction mechanism was proposed.The results indicated that the SepH and Mag can inhibit the agglomeration and enhance the dispersibility of nZVI,and Mag and nZVI displayed good synergetic effects.
基金Funded by the National Natural Science Foundation of China(No.51478370)
文摘As a decorative material, magnesium oxychloride cement was used as a photocatalyst supporter to purify the pollutants indoors. Due to excellent adsorption properties of activated carbon（AC）, the photocatalytic composties, TiO2/AC, were prepared and introduced into the porous magnesium oxychloride cement（PMOC） substrate to composite a sort of photocatalytic cementitious material（PCM）. The optimal composite processes were assessed by gas chromatograph, using toluene as the target. By comparing the perspective of toluene purification and thorough decomposition, it can be found that the optimal mass ratio for TiO2/AC composites is 4/25, and the heat treatment to TiO2/AC sample at 350 ℃ can play the optimal synergetic role of adsorbents in photocatalytic process. The synergistic effect of TiO2, AC and magnesium oxychloride cement（MOC） was also evaluated by gas chromatograph. One-take molding process was adopted to introduce the TiO2/AC into PMOC substrate, and its optimal mass fraction was 4 wt%, while the appropriate density of substrate was 0.35 g/cm3. Toluene degradation showed that the prepared PCM can degrade pollutants efficiently. The appropriate treatment process of TiO2/AC, mass of TiO2/AC, substrate density, and stable pore structure should be coordinated to maximize the adsorption-photodegradation performance. The combination of photocatalytic materials, adsorbents, and building materials provided a new idea for the application of photocatalysis.
基金supported by the National Natural Science Foundation of China(No.52374279)the Natural Science Foundation of Shaanxi Province(No.2024CY2-GJHX-69)
文摘With the development of the coal chemical industry,the emission of coal gasification slag(CGS)has grown rapidly,raising widespread concerns about environmental pollution and resource waste.The composition and structural characteristics of CGS,such as high contents of carbon,silicon,and aluminum and well-developed pores,enable the preparation of CGS-based adsorbent materials for wastewater treatment and gas purification,thus promoting high-value resource utilization of CGS and achieving the goal of“treating waste with waste.”On the basis of the compositional and structural characteristics of CGS being summarized in this review,the preparation methods of CGS-based adsorbent materials,such as activated carbon,zeolite,mesoporous silica,and carbon-silica composites,are systematically outlined as well as their preparation mechanisms are deeply elucidated.Then,the current application status and adsorption mechanisms of various types of CGS-based adsorbent materials in the fields of wastewater treatment and gas purification,such as heavy-metal removal,nitrate removal,ammonia-nitrogen removal,dye removal,CO_(2)absorption,and pollutant adsorption-catalytic degradation,are fully discussed.Finally,bottlenecks and key research directions in the preparation of highvalue-added adsorbent materials from CGS are summarized and prospected.This review is of significant relevance in promoting the product development and industrial application of CGS in the field of adsorption.
基金supported by the National Natural Science Foundation of China(22231012,22090061,21821003,and 22401296)the XPLORER PRIZEthe Natural Science Foundation of Guangdong Province(2023A1515110457).
文摘CONSPECTUS:As a simple and common physicochemical process,adsorption is the basis of storage,separation,and many other applications.Compared to conventional adsorbents,molecule-based crystalline materials show advantages of extremely rich and easily designable/synthesized/characterized structures as well as remarkable flexibility.The emergence of new adsorbent materials has brought forth both opportunities and challenges for adsorption theory and its applications.
