Tin-based porous electro-adsorption arsenic removal material as well as preparation method and application thereof
An electro-adsorption, tin-based technology is applied in the field of tin-based porous electro-adsorption arsenic removal materials and their preparation, which can solve the problems of difficult desorption and regeneration of arsenic adsorption materials, small effective arsenic adsorption, etc., to achieve abundant pores and reduce material costs. , good electrical contact effect
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Embodiment 1
[0026]In this example, 200g of metal tin powder with a purity of 99wt.% and a particle size of 80 mesh was added to a flat rectangular mold (100mm×50mm×15mm), and molded with a hot press at 205°C to prepare a porous metal tin electrode. plate. The applied pressure is 5MPa, and the hot pressing time is 10min. The size of the prepared porous metal tin plate is 100mm×50mm×8.3mm, and the pore diameter is 20-50µm. According to the density of metal tin, the porosity of porous metal tin is estimated to be about 34%. After the porous metal tin plate is made, it is used as the anode and the stainless steel mesh is used as the cathode, and anodic oxidation is carried out in 5mol / L sodium fluoride aqueous solution, the anodic oxidation voltage is 20V, and the oxidation time is 120min. The anodized porous metal tin plate was put into the cavity of a microwave oven, protected by argon gas, and then the power was adjusted to 1000W. After microwave heating for 60 seconds, it was taken out a...
Embodiment 2
[0028] In this example, the tin-based porous electrosorption material prepared in Example 1 was used as the anode, and the graphite sheet was used as the cathode, and the arsenic removal test by electrosorption was carried out under the condition of continuous stirring. A conductive carbon fiber felt with a similar size is used as the anode, and a graphite sheet is used as the cathode. The comparative test is carried out under the same conditions, and the power supply adopts a programmable DC power supply. The arsenic concentration of the raw water is 357.1ppb, the electrical conductivity is 322 μs / cm, the pH value is 7.4, and the volume of the raw water is 5L. The first group of experiments did not apply voltage. After 24 hours, the arsenic concentration in the water sample corresponding to the conductive carbon fiber felt anode was 352.5ppb, and the arsenic concentration in the water sample corresponding to the tin-based anode was 179.0ppb; the second group of experiments app...
Embodiment 3
[0031] In this example, the tin-based porous electro-adsorption material (24-hour sample) for electro-absorbing arsenic in Example 2 was used as the cathode, and graphite was used as the anode. The desorption test was carried out under continuous stirring conditions, and the power supply was a programmable DC power supply. The arsenic concentration of the raw water is 0 ppb, the conductivity is 411 μs / cm, the pH value is 7.5, and the volume of the raw water is 1 L. The arsenic concentrations in the water were 71.2ppb and 69.4ppb after the positive and negative electrodes were short-circuited for 2 hours and 6 hours; after the positive and negative electrodes were short-circuited for 6 hours and samples were taken, a reverse voltage of 2.0V was applied for 2 hours and 6 hours After sampling and testing, the arsenic concentrations in the water were 977ppb and 1135.5ppb respectively; after applying a reverse voltage of 2.0V for 6 hours and sampling, the reverse voltage was increas...
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Abstract
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