Method for preparing efficient heavy metal adsorbent from modified cotton stalk biomass charcoal
A biomass charcoal, cotton straw technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of small pore size, low performance, long reaction time, etc. The effect of short sex time
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Embodiment 1
[0023] The preparation method of cotton biochar: cut the washed and dried cotton stalks into pieces, put them into a pulverizer for preliminary crushing, sieve the crushed stalks, weigh the 100-mesh cotton and put it in a ceramic crucible. Carbonize in a Furnace at 300°C for 6h. The carbonized biochar was weighed, and the carbonization rate of the straw was calculated to be 48.04%.
[0024] Modification method of biochar: first add 0.3mol / L KMnO to 1g of biochar 4 Solution 7.4ml, then add 3.6ml60%HNO 3 The solution was heated in a temperature-controlled water bath at 90°C for 3 hours, filtered through filter paper, and the biochar was washed with deionized water until the pH of the filtrate was constant. Put the filter residue and filter paper in an evaporating dish and bake at 80°C for 7 hours.
Embodiment 2
[0026] Cut the cleaned and dried cotton stalks into pieces, put them into a pulverizer for preliminary crushing, sieve the crushed stalks, weigh the sieved 60-mesh cotton, put it in a ceramic crucible, and put it in a muffle furnace at a temperature of 300 ° C. Carbonization 4.5h. The carbonized biochar was weighed, and the carbonization rate of the straw was calculated to be 46.43%.
[0027] Modification method of biochar: first add 0.3mol / L KMnO to 1g of biochar 4 Solution 7ml, then add 3.3ml60%HNO 3 The solution was heated in a temperature-controlled water bath at 90°C for 3 hours, filtered with filter paper, and the biochar was washed with deionized water until the pH of the filtrate was constant. Put the filter residue and filter paper in an evaporating dish and bake at 80°C for 8 hours.
Embodiment 3
[0029] Cut the cleaned and dried cotton stalks into pieces, put them into a pulverizer for preliminary crushing, sieve the crushed stalks, weigh the sieved 20-mesh cotton, put it in a ceramic crucible, and put it in a muffle furnace at a temperature of 300 ° C. Carbonization for 3h. The carbonized biochar was weighed, and the carbonization rate of the straw was calculated to be 44.89%.
[0030] Modification method of biochar: first add 0.3mol / L KMnO to 1g of biochar 4 Solution 7.8ml, then add 4.0ml60%HNO 3 The solution was heated in a temperature-controlled water bath at 90°C for 3 hours, filtered with filter paper, and the biochar was washed with deionized water until the pH of the filtrate was constant. Put the filter residue and filter paper in an evaporating dish and bake at 80°C for 8 hours.
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