Zhejiang University

Changai Zhang

Shengdao Shan

Jingming Li

Wanpeng Liu

Haifeng Zhuang

Baolan Hu

Zhirong Wang

Ping Zheng

Huicai Cheng

Yongpeng Luo

Wu Huang

Liting Zhang

Zhichao Hu

Tianyong Xiang

Disclosed is a method of preparing a carbon quantum dot from soybean dregs by hydrothermal synthesis, including: mixing the soybean dregs with water, and subjecting the reaction mixture under heating at 100-500&#xb0; C. in an autoclave for reaction; cooling the reaction mixture when the reaction is completed, and removing insoluble substances from the reaction mixture; and dialyzing the reaction mixture, and lyophilizing the dialyzed product to produce the carbon quantum dot. The invention further provides the carbon quantum dot prepared by the above method and a use thereof in the detection of Feand Hgin water, where the lowest detection limit can reach 30 nmol/L and the detection range is 0.1-50 &#x3bc;mol/L.

Method of making biomass fluorescent carbon quantum dots from soybean dregs by hydrothermal synthesis and uses thereof

A high-concentration anaerobic fermentation apparatus includes a liquid accumulation tank, a fermentation vessel, a feeding assembly, and a biogas residue collecting bin. The feeding assembly includes a hopper and a return conveyor belt including a first portion extending downward from the hopper till below a liquid level, a second portion extending upward from a bottom end of the first portion till above the liquid level, a third portion extending downward from a top end of the second portion till the liquid level, and a fourth portion extending upward from a bottom end of the third portion till out of the liquid level and above the biogas residue collecting bin. A pressure-feed flange is disposed at an outer side of the fermentation vessel, a feed channel is formed between the pressure-feed flange and the first portion, and a discharge channel is formed between the pressure-feed flange and the fourth portion.

High-concentration anaerobic fermentation apparatus

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Zhejiang, China

Changai Zhang