Preparation method and application of polymeric flocculant
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A flocculant and reaction system technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor removal of heavy metal ions in sewage, low regeneration ability of flocculant, no preparation method and application, etc., and achieve wide application effect of space
Inactive Publication Date: 2013-03-06
HUAZHONG AGRI UNIV
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[0026] At present, the research and development of natural polysaccharide flocculants at home and abroad are mainly concentrated on starch, cellulose, chitin or chitosan and their derivatives, while the research on KGM is mainly based on the single use of cross-linking or grafting. Preparation of flocculants by copolymerization or carboxymethylation has poor effect on removing heavy metal ions from sewage, and the regeneration ability of flocculants is low
[0027] So far, there has been no use of konjac flour as a raw material to prepare a polymer flocculant by a three-step method of cross-linking-grafting-xanthation and its multi-functional flocculant for removing heavy metal ions in sewage, especially copper ions and reducing sewage turbidity. Reports on preparation methods and applications
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Embodiment 2
[0086] Embodiment 2 adsorption experiment
[0087] 1. Experimental materials: the same as in Example 1.
[0088] 2. Experimental method
[0089] (1) Feeding amount to Cu 2+ The effect of adsorption performance
[0090] Take 50mg / L of Cu 2+ The solution was 100mL, the pH value of the solution was adjusted to 5.0, different amounts of flocculant CKAX were added, and the flocculation experiment was carried out at room temperature. The experimental results were as follows Figure 7 shown.
[0091] Depend on Figure 7 It can be seen that with the increase of sample dosage, the effect of CKAX on metal ion Cu 2+ The removal rate of Cu 2+ The removal rate showed a downward trend instead. This may be because the excessive flocculant will stick to the surface of the floc, and the xanthic acid group on the flocculant will be negatively charged after dissociation, so that the floc also bears a negative charge, thereby generating electrostatic repulsion and making it difficult to c...
Embodiment 3
[0127] Embodiment 3 analysis and regeneration experiment
[0128] The desorption effects of hydrochloric acid and nitric acid on the CKAX loaded with copper ions were investigated. For load Cu2+ The optimal desorption conditions of CKAX are: room temperature (25°C), hydrochloric acid 0.2mol / L or HNO 3 0.2mol / L, desorb for 30min. Under these conditions, the adsorbent regeneration experiment was carried out, and the specific steps were as follows:
[0129] 1. Experimental materials: as described in Example 1.
[0130] 2. Experimental method
[0131] Prepare 1000mg / L copper ion standard aqueous solution according to GB7475-87, and then dilute it with distilled water to different concentrations as needed. Take 100mg / L copper ion solution, pour it into a 250mL Erlenmeyer flask, then add 0.1g flocculant CKAX, stir rapidly (150r / min) at room temperature for 2min, stir slowly (50r / min) for 10min, and let stand for 15min. Centrifuge for 10min (4200r / min), take the supernatant and...
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Abstract
The invention belongs to the technical field of polymeric flocculant synthesis, and concretely relates to a preparation and an application of a flocculant suitable for sewage treatment. The flocculant can be used for the sewage treatment field. The preparation of the flocculant is characterized in that a final product which is konjak grafted xanthate is obtained through an epichlorohydrin crosslinking-acrylamide grafting-xanthation three-step process carried out on konjak powder which is a raw material. The preparation method of the flocculant concretely comprises the following steps: adding the konjak powder and distilled water into a three-necked bottle having a stirring and condensing device to form a reaction system; adding epichlorohydrin to the reaction system, and continuously stirring; adjusting the temperature of the reaction system under the protection of nitrogen, and adding ceric ammonium nitrate to the reaction system; adding acrylamide; adding sodium hydroxide and carbon disulfide to make reaction products be saffron in color; and adjusting the pH of the obtained reaction product solution to 7, repeatedly washing with ethanol, carrying out vacuum dying of crude products, crushing, and sieving to obtain the polymeric flocculant. The first regeneration desorption rate of the polymeric flocculant can reach 96%, and the copper ion removal rate of the polymeric flocculant can reach above 80%.
Description
technical field [0001] The invention belongs to the technical field of polymer flocculant synthesis, and specifically relates to a method and application for synthesizing a novel flocculant by using konjac flour as a raw material. The product can be used in the field of sewage treatment. Background technique [0002] 1 Classification of flocculants [0003] There are many ways to classify flocculants. According to their chemical composition, they can be divided into inorganic flocculants, organic flocculants and biological flocculants that have emerged in recent years. According to the molecular weight, the characteristics of functional groups and the charge properties after the dissociation of functional groups, it can be divided into low molecular flocculants, polymer flocculants, anionic flocculants, cationic flocculants and nonionic flocculants, etc. Among them, the dosage of inorganic flocculants is relatively large, and the amount of sludge generated is also large; or...
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