With the aid of Riemann–Liouville fractional calculus theory,fractional order Savitzky–Golay differentiation（FOSGD） is calculated and applied to pretreat near infrared（NIR） spectra in order to improve the perfor...With the aid of Riemann–Liouville fractional calculus theory,fractional order Savitzky–Golay differentiation（FOSGD） is calculated and applied to pretreat near infrared（NIR） spectra in order to improve the performance of multivariate calibrations.Similar to integral order Savitzky–Golay differentiation（IOSGD）,FOSGD is obtained by fitting a spectral curve in a moving window with a polynomial function to estimate its coefficients and then carrying out the weighted average of the spectral curve in the window with the coefficients.Three NIR datasets including diesel,wheat and corn datasets were utilized to test this method.The results showed that FOSGD,which is easy to compute,is a general method to obtain Savitzky–Golay smoothing,fractional order and integral order differentiations.Fractional order differentiation computation to the NIR spectra often improves the performance of the PLS model with smaller RMSECV and RMSEP than integral order ones,especially for physical properties of interest,such as density,cetane number and hardness.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
基金supported by Science and Technology Commission of Shanghai Municipality (No.14142201400)
文摘With the aid of Riemann–Liouville fractional calculus theory,fractional order Savitzky–Golay differentiation（FOSGD） is calculated and applied to pretreat near infrared（NIR） spectra in order to improve the performance of multivariate calibrations.Similar to integral order Savitzky–Golay differentiation（IOSGD）,FOSGD is obtained by fitting a spectral curve in a moving window with a polynomial function to estimate its coefficients and then carrying out the weighted average of the spectral curve in the window with the coefficients.Three NIR datasets including diesel,wheat and corn datasets were utilized to test this method.The results showed that FOSGD,which is easy to compute,is a general method to obtain Savitzky–Golay smoothing,fractional order and integral order differentiations.Fractional order differentiation computation to the NIR spectra often improves the performance of the PLS model with smaller RMSECV and RMSEP than integral order ones,especially for physical properties of interest,such as density,cetane number and hardness.
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.
