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Study on the catalytic degradation of sodium lignosulfonate to aromatic aldehydes over nano-cuo:Process optimization and reaction kinetics

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Chinese Journal of Chemical Engineering 2023年第1期53卷 300-309页

作者： Yingjie Song Shuqi Zhong Yingjiao Li Kun Dong Yong Luo Guangwen Chu Haikui Zou Baochang Sun State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

As one of the few renewable aromatic resources,the research of depolymerization of lignin into highvalue chemicals has attracted extensive attention in recent *** wet aerobic oxidation(CWAO)is an effective technology to convert lignin like sodium lignosulfonate(SL),a lignin derivative,into aromatic aldehydes such as vanillin and ***,how to improve the yield of aromatic aldehyde and conversion efficiency is still a challenge,and many operating conditions that significantly affect the yield of these aromatic compounds have rarely been investigated *** this work,we adopted the stirred tank reactor(STR)for the CWAO process with nano-cuo as catalyst to achieve the conversion of SL into vanillin and *** effect of operating conditions including reaction time,oxygen partial pressure,reaction temperature,SL concentration,rotational speed,catalyst amount,and NaOH concentration on the yield of single phenolic compound was systematically *** results revealed that all these operating conditions exhibit a significant effect on the aromatic aldehyde ***,they should be regulated in an optimal value to obtain high yield of these *** importantly,the reaction kinetics of the lignin oxidation was *** work could provide basic data for the optimization and design of industrial operation of lignin oxidation.

关键词： nano-cuo Sodium lignosulfonate Catalytic wet aerobic oxidation(CWAO) Aromatic aldehyde Reaction kinetics

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Toxic Effects of nano-cuo, Micro-cuo and Cu<sup>2+</sup>on <i>Chlorella</i>sp.

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Journal of Environmental Protection 2013年第1期4卷 86-91页

作者： Liyan Wang Mian Wang Changsheng Peng Jinfen Pan Key Lab of Marine Environmental Science and Ecology of the Ministry of Education College of Environmental Science and Engineering Ocean University of China Qingdao China 266100

The 96 h acute toxic effects of nano-cuo (N-cuo), micro-cuo (M-cuo) and 2+ on Chlorella sp. were investigated in this paper. The results showed that toxicities decreased in an order of Cu2+>N-cuo>M-cuo. The 96 h EC50 of Cu2+ on Chlorella sp. was 1.06 mg /L, and of N-cuo it was 74.61 mg /L, while no pronounced toxicity was observed when the concentration of M-cuo was lower than 160 mg/L. Further experiments were carried out in order to study the toxicity mechanism of nano-cuo on Chlorella sp.. The results of Cu2+ release from N-cuo showed less than 0.2 mg/L Cu2+ were released, so the release of Cu2+ was not responsible for the toxicity. Further experiments showed N-cuo inhibited formation of Chlorophyll A. Content of Chlorophyll A in the control group was 4.75 mg/108 cells, while it declined to 2.89 mg/108 cells for 160 mg/L N-cuo after 96 h, which indicated that N-cuo could inhibit photosynthesis of Chlorella sp.. Moreover, N-cuo condensed with algal cells. It affected the activity of SOD and POD, indicating that N-cuo could cause oxidant stress to Chlorella sp.. These may be the toxicity mechanism.

关键词： nano-cuo Chlorella sp. Toxic effects Photosynthesis Oxidant stress

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