The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jinhua Zhan - One of the best experts on this subject based on the ideXlab platform.
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effect of ph on oh induced degradation progress of syringol Syringaldehyde and health effect
Chemosphere, 2020Co-Authors: Jianfei Sun, Dandan Han, Qiong Mei, Bo Wei, Xueyu Wang, Ju Xie, Jinhua ZhanAbstract:Abstract Syringol and Syringaldehyde are widely present pollutants in atmosphere and wastewater due to lignin pyrolysis and draining of pulp mill effluents. The hydroxylation degradation mechanisms and kinetics and health effect assessment of them under high and low-NOx regimes in atmosphere and wastewater have been studied theoretically. The effect of pH on reaction mechanisms and rate constants in their · O H -initiated degradation processes has been fully investigated. Results have suggested that aqueous solution played a positive role in the · O H -initiated degradation reactions by decreasing the energy barriers of most reactions and changing the reactivity order of initial reactions. For Sy− and Sya− (anionic species of syringol and Syringaldehyde), most initial reaction routes were more likely to occur than that of HSy and Hsya (neutral species of syringol and Syringaldehyde). As the pH increased from 1 to 14, the overall rate constants (at 298 K) of syringol and Syringaldehyde with · O H in wastewater increased from 5.43 × 1010 to 9.87 × 1010 M−1 s−1 and from 3.70 × 1010 to 1.14 × 1011 M−1 s−1, respectively. In the NOx-rich environment, 4-nitrosyringol was the most favorable product, while ring-opening oxygenated chemicals were the most favorable products in the NOx-poor environment. On the whole, the NOx-poor environment could decrease the toxicities during the hydroxylation processes of syringol and Syringaldehyde, which was the opposite in a NOx-rich environment. · O H played an important role in the methoxyphenols degradation and its conversion into harmless compounds in the NOx-poor environment.
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effect of ph on formula omitted induced degradation progress of syringol Syringaldehyde and health effect
Chemosphere, 2020Co-Authors: Jianfei Sun, Dandan Han, Qiong Mei, Bo Wei, Ju Xie, X Q Wang, Jinhua ZhanAbstract:Syringol and Syringaldehyde are widely present pollutants in atmosphere and wastewater due to lignin pyrolysis and draining of pulp mill effluents. The hydroxylation degradation mechanisms and kinetics and health effect assessment of them under high and low-NOₓ regimes in atmosphere and wastewater have been studied theoretically. The effect of pH on reaction mechanisms and rate constants in their ·OH-initiated degradation processes has been fully investigated. Results have suggested that aqueous solution played a positive role in the ·OH-initiated degradation reactions by decreasing the energy barriers of most reactions and changing the reactivity order of initial reactions. For Sy⁻ and Sya⁻ (anionic species of syringol and Syringaldehyde), most initial reaction routes were more likely to occur than that of HSy and Hsya (neutral species of syringol and Syringaldehyde). As the pH increased from 1 to 14, the overall rate constants (at 298 K) of syringol and Syringaldehyde with ·OH in wastewater increased from 5.43 × 10¹⁰ to 9.87 × 10¹⁰ M⁻¹ s⁻¹ and from 3.70 × 10¹⁰ to 1.14 × 10¹¹ M⁻¹ s⁻¹, respectively. In the NOₓ-rich environment, 4-nitrosyringol was the most favorable product, while ring-opening oxygenated chemicals were the most favorable products in the NOₓ-poor environment. On the whole, the NOₓ-poor environment could decrease the toxicities during the hydroxylation processes of syringol and Syringaldehyde, which was the opposite in a NOₓ-rich environment. ·OH played an important role in the methoxyphenols degradation and its conversion into harmless compounds in the NOₓ-poor environment.
Jianfei Sun - One of the best experts on this subject based on the ideXlab platform.
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effect of ph on oh induced degradation progress of syringol Syringaldehyde and health effect
Chemosphere, 2020Co-Authors: Jianfei Sun, Dandan Han, Qiong Mei, Bo Wei, Xueyu Wang, Ju Xie, Jinhua ZhanAbstract:Abstract Syringol and Syringaldehyde are widely present pollutants in atmosphere and wastewater due to lignin pyrolysis and draining of pulp mill effluents. The hydroxylation degradation mechanisms and kinetics and health effect assessment of them under high and low-NOx regimes in atmosphere and wastewater have been studied theoretically. The effect of pH on reaction mechanisms and rate constants in their · O H -initiated degradation processes has been fully investigated. Results have suggested that aqueous solution played a positive role in the · O H -initiated degradation reactions by decreasing the energy barriers of most reactions and changing the reactivity order of initial reactions. For Sy− and Sya− (anionic species of syringol and Syringaldehyde), most initial reaction routes were more likely to occur than that of HSy and Hsya (neutral species of syringol and Syringaldehyde). As the pH increased from 1 to 14, the overall rate constants (at 298 K) of syringol and Syringaldehyde with · O H in wastewater increased from 5.43 × 1010 to 9.87 × 1010 M−1 s−1 and from 3.70 × 1010 to 1.14 × 1011 M−1 s−1, respectively. In the NOx-rich environment, 4-nitrosyringol was the most favorable product, while ring-opening oxygenated chemicals were the most favorable products in the NOx-poor environment. On the whole, the NOx-poor environment could decrease the toxicities during the hydroxylation processes of syringol and Syringaldehyde, which was the opposite in a NOx-rich environment. · O H played an important role in the methoxyphenols degradation and its conversion into harmless compounds in the NOx-poor environment.
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effect of ph on formula omitted induced degradation progress of syringol Syringaldehyde and health effect
Chemosphere, 2020Co-Authors: Jianfei Sun, Dandan Han, Qiong Mei, Bo Wei, Ju Xie, X Q Wang, Jinhua ZhanAbstract:Syringol and Syringaldehyde are widely present pollutants in atmosphere and wastewater due to lignin pyrolysis and draining of pulp mill effluents. The hydroxylation degradation mechanisms and kinetics and health effect assessment of them under high and low-NOₓ regimes in atmosphere and wastewater have been studied theoretically. The effect of pH on reaction mechanisms and rate constants in their ·OH-initiated degradation processes has been fully investigated. Results have suggested that aqueous solution played a positive role in the ·OH-initiated degradation reactions by decreasing the energy barriers of most reactions and changing the reactivity order of initial reactions. For Sy⁻ and Sya⁻ (anionic species of syringol and Syringaldehyde), most initial reaction routes were more likely to occur than that of HSy and Hsya (neutral species of syringol and Syringaldehyde). As the pH increased from 1 to 14, the overall rate constants (at 298 K) of syringol and Syringaldehyde with ·OH in wastewater increased from 5.43 × 10¹⁰ to 9.87 × 10¹⁰ M⁻¹ s⁻¹ and from 3.70 × 10¹⁰ to 1.14 × 10¹¹ M⁻¹ s⁻¹, respectively. In the NOₓ-rich environment, 4-nitrosyringol was the most favorable product, while ring-opening oxygenated chemicals were the most favorable products in the NOₓ-poor environment. On the whole, the NOₓ-poor environment could decrease the toxicities during the hydroxylation processes of syringol and Syringaldehyde, which was the opposite in a NOₓ-rich environment. ·OH played an important role in the methoxyphenols degradation and its conversion into harmless compounds in the NOₓ-poor environment.
Yonghao Ni - One of the best experts on this subject based on the ideXlab platform.
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furfural formation from the pre hydrolysis liquor of a hardwood kraft based dissolving pulp production process
Bioresource Technology, 2013Co-Authors: Huiren Hu, Sarwar M Jahan, Yonghao NiAbstract:Abstract This study aimed to produce furfural from the PHL. Results showed best furfural yield of 32.8% and the furfural selectivity of 37.7% in the monophase system (170 °C, 100 min), while they were 60.1% and 69.8%, respectively in the biphase system. The lower furfural selectivity in the monophase system was explained by more side reactions, such as fragmentation, condensation reactions, resinification and others. Model compounds such as: xylose, furfural, Syringaldehyde, were used to confirm/identify these side reactions. The addition of dilute sulfuric acid/acetic acid in the system under the same conditions decreased the recovery of furfural. The addition of Syringaldehyde into the PHL also led to a decrease in the furfural yield, supporting the conclusion that lignin structures in the PHL may also be involved in the side reactions, thus decreasing the furfural yield.
Bo Wei - One of the best experts on this subject based on the ideXlab platform.
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effect of ph on oh induced degradation progress of syringol Syringaldehyde and health effect
Chemosphere, 2020Co-Authors: Jianfei Sun, Dandan Han, Qiong Mei, Bo Wei, Xueyu Wang, Ju Xie, Jinhua ZhanAbstract:Abstract Syringol and Syringaldehyde are widely present pollutants in atmosphere and wastewater due to lignin pyrolysis and draining of pulp mill effluents. The hydroxylation degradation mechanisms and kinetics and health effect assessment of them under high and low-NOx regimes in atmosphere and wastewater have been studied theoretically. The effect of pH on reaction mechanisms and rate constants in their · O H -initiated degradation processes has been fully investigated. Results have suggested that aqueous solution played a positive role in the · O H -initiated degradation reactions by decreasing the energy barriers of most reactions and changing the reactivity order of initial reactions. For Sy− and Sya− (anionic species of syringol and Syringaldehyde), most initial reaction routes were more likely to occur than that of HSy and Hsya (neutral species of syringol and Syringaldehyde). As the pH increased from 1 to 14, the overall rate constants (at 298 K) of syringol and Syringaldehyde with · O H in wastewater increased from 5.43 × 1010 to 9.87 × 1010 M−1 s−1 and from 3.70 × 1010 to 1.14 × 1011 M−1 s−1, respectively. In the NOx-rich environment, 4-nitrosyringol was the most favorable product, while ring-opening oxygenated chemicals were the most favorable products in the NOx-poor environment. On the whole, the NOx-poor environment could decrease the toxicities during the hydroxylation processes of syringol and Syringaldehyde, which was the opposite in a NOx-rich environment. · O H played an important role in the methoxyphenols degradation and its conversion into harmless compounds in the NOx-poor environment.
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effect of ph on formula omitted induced degradation progress of syringol Syringaldehyde and health effect
Chemosphere, 2020Co-Authors: Jianfei Sun, Dandan Han, Qiong Mei, Bo Wei, Ju Xie, X Q Wang, Jinhua ZhanAbstract:Syringol and Syringaldehyde are widely present pollutants in atmosphere and wastewater due to lignin pyrolysis and draining of pulp mill effluents. The hydroxylation degradation mechanisms and kinetics and health effect assessment of them under high and low-NOₓ regimes in atmosphere and wastewater have been studied theoretically. The effect of pH on reaction mechanisms and rate constants in their ·OH-initiated degradation processes has been fully investigated. Results have suggested that aqueous solution played a positive role in the ·OH-initiated degradation reactions by decreasing the energy barriers of most reactions and changing the reactivity order of initial reactions. For Sy⁻ and Sya⁻ (anionic species of syringol and Syringaldehyde), most initial reaction routes were more likely to occur than that of HSy and Hsya (neutral species of syringol and Syringaldehyde). As the pH increased from 1 to 14, the overall rate constants (at 298 K) of syringol and Syringaldehyde with ·OH in wastewater increased from 5.43 × 10¹⁰ to 9.87 × 10¹⁰ M⁻¹ s⁻¹ and from 3.70 × 10¹⁰ to 1.14 × 10¹¹ M⁻¹ s⁻¹, respectively. In the NOₓ-rich environment, 4-nitrosyringol was the most favorable product, while ring-opening oxygenated chemicals were the most favorable products in the NOₓ-poor environment. On the whole, the NOₓ-poor environment could decrease the toxicities during the hydroxylation processes of syringol and Syringaldehyde, which was the opposite in a NOₓ-rich environment. ·OH played an important role in the methoxyphenols degradation and its conversion into harmless compounds in the NOₓ-poor environment.
Dandan Han - One of the best experts on this subject based on the ideXlab platform.
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effect of ph on oh induced degradation progress of syringol Syringaldehyde and health effect
Chemosphere, 2020Co-Authors: Jianfei Sun, Dandan Han, Qiong Mei, Bo Wei, Xueyu Wang, Ju Xie, Jinhua ZhanAbstract:Abstract Syringol and Syringaldehyde are widely present pollutants in atmosphere and wastewater due to lignin pyrolysis and draining of pulp mill effluents. The hydroxylation degradation mechanisms and kinetics and health effect assessment of them under high and low-NOx regimes in atmosphere and wastewater have been studied theoretically. The effect of pH on reaction mechanisms and rate constants in their · O H -initiated degradation processes has been fully investigated. Results have suggested that aqueous solution played a positive role in the · O H -initiated degradation reactions by decreasing the energy barriers of most reactions and changing the reactivity order of initial reactions. For Sy− and Sya− (anionic species of syringol and Syringaldehyde), most initial reaction routes were more likely to occur than that of HSy and Hsya (neutral species of syringol and Syringaldehyde). As the pH increased from 1 to 14, the overall rate constants (at 298 K) of syringol and Syringaldehyde with · O H in wastewater increased from 5.43 × 1010 to 9.87 × 1010 M−1 s−1 and from 3.70 × 1010 to 1.14 × 1011 M−1 s−1, respectively. In the NOx-rich environment, 4-nitrosyringol was the most favorable product, while ring-opening oxygenated chemicals were the most favorable products in the NOx-poor environment. On the whole, the NOx-poor environment could decrease the toxicities during the hydroxylation processes of syringol and Syringaldehyde, which was the opposite in a NOx-rich environment. · O H played an important role in the methoxyphenols degradation and its conversion into harmless compounds in the NOx-poor environment.
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effect of ph on formula omitted induced degradation progress of syringol Syringaldehyde and health effect
Chemosphere, 2020Co-Authors: Jianfei Sun, Dandan Han, Qiong Mei, Bo Wei, Ju Xie, X Q Wang, Jinhua ZhanAbstract:Syringol and Syringaldehyde are widely present pollutants in atmosphere and wastewater due to lignin pyrolysis and draining of pulp mill effluents. The hydroxylation degradation mechanisms and kinetics and health effect assessment of them under high and low-NOₓ regimes in atmosphere and wastewater have been studied theoretically. The effect of pH on reaction mechanisms and rate constants in their ·OH-initiated degradation processes has been fully investigated. Results have suggested that aqueous solution played a positive role in the ·OH-initiated degradation reactions by decreasing the energy barriers of most reactions and changing the reactivity order of initial reactions. For Sy⁻ and Sya⁻ (anionic species of syringol and Syringaldehyde), most initial reaction routes were more likely to occur than that of HSy and Hsya (neutral species of syringol and Syringaldehyde). As the pH increased from 1 to 14, the overall rate constants (at 298 K) of syringol and Syringaldehyde with ·OH in wastewater increased from 5.43 × 10¹⁰ to 9.87 × 10¹⁰ M⁻¹ s⁻¹ and from 3.70 × 10¹⁰ to 1.14 × 10¹¹ M⁻¹ s⁻¹, respectively. In the NOₓ-rich environment, 4-nitrosyringol was the most favorable product, while ring-opening oxygenated chemicals were the most favorable products in the NOₓ-poor environment. On the whole, the NOₓ-poor environment could decrease the toxicities during the hydroxylation processes of syringol and Syringaldehyde, which was the opposite in a NOₓ-rich environment. ·OH played an important role in the methoxyphenols degradation and its conversion into harmless compounds in the NOₓ-poor environment.
