Preparation method of heavy metal ion adsorbent based on modified bacterial cellulose
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A technology of bacterial cellulose and heavy metal ions, which is applied in microorganism-based methods, biochemical equipment and methods, chemical instruments and methods, etc., can solve the problems of weak adsorption capacity of plant cellulose and achieve good biocompatibility. , The process is simple, the adsorption effect is good
Active Publication Date: 2014-08-20
FUJIAN NORMAL UNIV
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Plant cellulose contains a large number of hydroxyl groups, which can use cellulose to adsorb metal ions, but the adsorption capacity of plant cellulose is not very strong
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Embodiment 1
[0030] (1) Preparation of modified bacterial cellulose by two-tank fermentation culture
[0031] 1. Pre-fermentation culture in mechanically stirred and ventilated fermenter
[0032] In a 15 L mechanically agitated and ventilated fermenter, put 8 L of sterilized fermented glutinous rice liquid and 0.64 L of gluconacetobacter xylosus seed solution, and then add 0.40 L of low-methoxy fruit glue solution. Control the stirring speed at 200 r / min, culture temperature at 30°C, tank pressure at 0.04MPa, ventilation rate at 0.5L / L·min, and obtain 8.9L of pre-mature fermented mash after pre-fermentation for 6 days. There will be a small amount of flocculent cellulose in the fermented mash before maturity.
[0033] 2. Post-fermentation culture in airlift tank
[0034]Transfer 8.9L of pre-ripening fermented mash into a sterilized airlift tank, and then add 1.78L of low-methoxyl pectin solution. Under the condition of 30°C, the oxygen-enriched air with an oxygen content of 50-80% prep...
Embodiment 2
[0040] (1) Preparation of modified bacterial cellulose by two-tank fermentation culture
[0041] 1、 Pre-fermentation in mechanically stirred ventilated fermenter nourish
[0042] In a 15 L mechanically agitated and ventilated fermenter, 10 L of sterilized fermented glutinous rice liquid culture liquid and Gluconacetobacter xylosus seed liquid were loaded, and the inoculation amount of Gluconacetobacter xylosus seed liquid was 0.8L, then add 0.5L of low-methoxyl pectin solution, adjust the stirring speed to 200 r / min, pre-fermentation culture temperature 30 ℃, tank pressure 0.04MPa, ventilation rate 0.5L / L min, after pre-fermentation 8 days Obtain 11.0L of fermented mash before maturation, and a small amount of flocculent cellulose will appear in the fermented mash before maturation in the mechanically stirred ventilated fermenter.
[0043] 2. Post-fermentation culture in airlift tank
[0044] Transfer 11.0L of pre-ripening fermented mash into a sterilized airlift tank, a...
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Abstract
The invention discloses a preparation method of a heavy metal ion adsorbent based on modified bacterial cellulose. The preparation method comprises the following steps: adding xylose gluconic acetobacter seed solution into a culture solution fermentation tank filled with sweet wine brewing biogas slurry, adding low-methoxyl pectins solution for fermenting and culturing into a front fermentation mash solution; adding the front fermentation mash solution into an airlift reactor, replenishing the low-methoxyl pectins solution, fermenting and culturing by using the airlift reactor to obtain a mature post-fermentation mash containing micelle modified bacterial cellulose; separating out the micelle modified bacterial cellulose, washing the micelle modified bacterial cellulose for a plurality of times and the immersing the micelle modified bacterial cellulose into NaOH solution, carrying out water bath till the micelle modified bacterial cellulose is semitransparent; finally washing the micelle modified bacterial cellulose with deionized water, drying the micelle modified bacterial cellulose, grinding the micelle modified bacterial cellulose to be greater than 40 meshes and taking the micelle modified bacterial cellulose as the heavy metal ion adsorbent. By adopting the preparation method, the process is simple; the prepared heavy metal ion adsorbent is non-toxic, good in biocompatibility, good in absorption effect on heavy metal ions and applicable to the food industry or the pharmaceutical industry.
Description
technical field [0001] The invention belongs to the field of heavy metal ion adsorbent preparation, and specifically relates to a method based on firstly adopting a two-pot method to prepare modified bacterial cellulose and then preparing a heavy metal ion adsorbent. Background technique [0002] The water environment is one of the basic elements of the environment, an important place for the survival and development of human society, and the most seriously disturbed and damaged area by human beings. The pollution and destruction of water environment has become one of the major environmental problems in the world today. Among them, heavy metal pollution is the most serious problem of water environment pollution. Heavy metal pollution refers to environmental pollution caused by heavy metals or their compounds, mainly caused by human factors such as mining, exhaust gas discharge, sewage irrigation and the use of heavy metal products. Heavy metals are not easy to move and dis...
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