Maize straw charcoal, method for utilizing maize straw charcoal to remove triclosan from water and application
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A corn stalk and biochar technology is applied in chemical instruments and methods, water pollutants, and other chemical processes to achieve the effect of ensuring the removal rate
Inactive Publication Date: 2016-08-17
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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[0002] For a long time, triclosan has been widely used as an artificial antibacterial agent, resulting in more and more triclosan entering the environment, which can be detected in water, sludge, sediment, animals and plants, and even human body its content; in recent years, the toxicity of triclosan has been continuously confirmed; at present, it takes a long time to degrade triclosan by biological methods, and chemical methods are prone to produce a large number of highly toxic compounds. The adsorption method is easy to operate and has no secondary pollution. Biochar adsorption can realize the resource utilization of agricultural waste, the treatment time is short, and the effect is good, but there is no report on this aspect so far
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Embodiment 1
[0035] A kind of corn stalk biochar, it is prepared through the following steps:
[0036] (1) Wash the corn stalks with tap water, air-dry them naturally, cut them into 1-5cm pieces, pulverize them with a grinder, mix them well, and seal them;
[0037] (2) Put the crushed corn stalks in the tubular atmosphere furnace and check the tightness;
[0038] (3) Use nitrogen to remove the oxygen in the tube of the tube atmosphere furnace, then open the tube atmosphere furnace, feed nitrogen, the nitrogen pressure is 0.25MPa, the outlet pipe is sealed with water to ensure air tightness, and the whole process is kept in the furnace tube anaerobic state;
[0039] (4) Program controlled temperature rise, rising to 450°C at 15°C / min, keeping for 20 minutes, rising to 700°C at the same heating rate, keeping for 180 minutes, and cooling to 500°C at 20°C / min;
[0040] (5) Cool to room temperature in the furnace to obtain biochar;
[0041] (6) Soak biochar in 1mol / L hydrochloric acid for 12...
Embodiment 2
[0044] Using the corn stalk biochar obtained in Example 1 as an adsorbent to treat polluted water containing triclosan, the dosage of the adsorbent is 4g / L, at 25°C, neutral, the initial concentration of triclosan is 10mg / L, After 90 minutes of reaction, the removal rate of triclosan reached 98.28%, and the biochar loading reached 2.717mg / L.
Embodiment 3
[0046] Using the corn stalk biochar obtained in Example 1 as an adsorbent to treat polluted water containing triclosan, the dosage of the adsorbent is 4g / L, neutral, and the initial concentration of triclosan is 10mg / L. The effect on the removal rate is shown in Table 1.
[0047] Table 1 The influence of time and temperature on the removal rate.
[0048]
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Abstract
The invention relates to a maize straw charcoal, a method for utilizing the maize straw charcoal to remove triclosan from water and application. The maize straw charcoal is prepared according to the following steps: (1) drying and smashing; (2) anaerobically carbonizing for 120-180min by adopting temperature programming under the condition of 500-700 DEG C; (3) cooling in a furnace to room temperature; and (4) soaking in hydrochloric acid, washing with deionized water till the eluate is neutral, drying till constant weight is achieved, grinding and filtering through a 60-mesh sieve. The maize straw charcoal is taken as an absorbent and is put into the triclosan-containing water for absorbing and removing triclosan, so that the problem of difficulty of treating the antibiotics in water is solved. The environment problem caused by the burning of straws is also solved, the wastes are turned into wealth, the resource utilization of maize straw is realized and the maize straw charcoal has high economic benefit and social benefit.
Description
technical field [0001] The invention relates to corn stalk biochar and a method and application thereof for removing triclosan in water, belonging to the technical field of water treatment. Background technique [0002] For a long time, triclosan has been widely used as an artificial antibacterial agent, resulting in more and more triclosan entering the environment, which can be detected in water, sludge, sediment, animals and plants, and even human body its content; in recent years, the toxicity of triclosan has been continuously confirmed; at present, it takes a long time to degrade triclosan by biological methods, and chemical methods are prone to produce a large number of highly toxic compounds. The adsorption method is easy to operate and has no secondary pollution. Biochar adsorption can realize the resource utilization of agricultural waste, with short processing time and good effect, but there is no report on this aspect so far. Contents of the invention [0003] ...
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