Preparation method of novel straw cellulose adsorbent

Abstract

The invention discloses a preparation method of a novel straw cellulose adsorbent. The preparation method comprises the following steps: after putting cleaned straw in a steam explosion tank for steam explosion treatment, taking the straw out; adding concentrated hydrochloric acid for acidification treatment; after adding tetradecane base trimethyl ammonium chloride according to a certain mass ratio, adding ammonium hydroxide and epoxy chloropropane into a reaction vessel at the same time, and reacting for 4 h at the temperature of 60 DEG C to obtain a product; adding NaOH, and reacting for 8 h at the temperature of 110 DEG C; filtering and washing until the product is neutral, putting the washed product in a three-mouth bottle, and carrying out ultrasonic activation treatment to obtain an activated fiber product; dissolving thiosemicarbazide in the reaction vessel, adding the activated fiber product and glutaraldehyde, reacting for 4.5 h at the temperature of 92 DEG C, filtering, washing, and drying at the temperature of 53 DEG C to obtain a finished product. The preparation method is simple, free of pollution and low in cost, the chemical reactivity of straw cellulose is improved, and the prepared straw adsorbent is high in separation and enrichment efficiency, large in adsorption capacity, energy-saving, environment-friendly and wide in application range, and has practical applicability.

Description

technical field [0001] The invention relates to the field of adsorbents, in particular to a preparation method of a novel straw cellulose adsorbent. Background technique [0002] my country is a large agricultural production country, and a large amount of agricultural straw is produced every year. According to statistics, there are more than 600 million tons of crop straw produced in my country every year. Crop stalks not only contain various nutrients needed for plant growth, but also rich in organic matter. It can be used not only as a feed resource, but also as a source of soil organic matter. At present, the utilization rate of straw in our country is only 33%, of which only about 2.6% have been processed by technology. [0003] With the continuous improvement of rural living standards, energy sources such as coal and natural gas have gradually replaced straw as the main energy source for rural life. At the same time, the rapid development of intensive farming and feed...

AI Technical Summary

Problems solved by technology

[0004] The separation methods of precious metals mainly include precipitation method, extraction method, ion exchange method, electrolysis method and selective volatilization method, etc. The most prominent shortcomings of these methods are that when treating low-concentration metal wastewater, the operation is cumbersome, the operation cost is high, and the energy consumption is large. , and easily cause secondary pollution

Before the 1970s, the classic refining process based on selective precipitation was used to separate and purify precious metals. The process was long, the cycle was long, the plant area was large, the operation was complicated, and the direct recovery rate was low. Some precious metals were stranded in the production process. Economic benefits are affected

The ion exchange method has been widely used in the separation of metal ions, but the disadvantage of the ion exchange method is intermittent operation, which is not suitable for a large amount of metallurgical feed liquid, and is only used in the refining process.

In the past two decades, solvent extraction has been widely used in the production of precious metals due to its technical superiority and significant economic benefits, but its disadvantages are easy emulsification and high loss rate.