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Method for preparing high-efficiency adsorbent for dyed wastewater from discarded goat wool

A technology for dyeing wastewater and goat hair, which is applied in chemical instruments and methods, textile industry wastewater treatment, adsorption water/sewage treatment, etc., can solve the problems of non-environmental protection, high cost, and complicated modification methods, and achieve the purpose of increasing amorphous zone effect

Active Publication Date: 2019-09-17
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high cost
Someone proposed to use hair as the raw material, and then modify it with formaldehyde and dimethylamine in two steps after pretreatment with NaOH aqueous solution to prepare a modified keratin adsorbent containing quaternary ammonium salts, but the modification method is complicated. and not environmentally friendly

Method used

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  • Method for preparing high-efficiency adsorbent for dyed wastewater from discarded goat wool
  • Method for preparing high-efficiency adsorbent for dyed wastewater from discarded goat wool
  • Method for preparing high-efficiency adsorbent for dyed wastewater from discarded goat wool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Using steam flash explosion and liquid nitrogen crushing technology to process waste goat hair, the specific steps are as follows:

[0034] Step 1: Pretreatment of waste goat hair by steam flash explosion:

[0035] (1) Carry out steam flash explosion on waste goat hair, the steam flash explosion pressure is 1.5MPa, and the steam flash explosion time is 150s;

[0036] (2) adopt 200 mesh sieves, filter and remove the water in the goat hair after steam flash explosion;

[0037] (3) Put the sample after steam flash explosion into -80°C ultra-low temperature refrigerator to freeze for 2 hours, then dry the goat hair by vacuum freeze-drying method, the vacuum degree is 9.5Pa, the temperature is -50°C, and the drying time is 48h;

[0038] Step 2: Liquid nitrogen freezing and crushing: The flash-exploded and dried goat hair is crushed with liquid nitrogen to obtain a goat hair powder with a particle size of 20 μm. The goat hair is small in size and has small voids inside, so i...

Embodiment 2

[0042] Embodiment 2: the influence of different steam flash explosion conditions on the performance of goat hair powder

[0043] 1. Effects of different flash explosion pressures on the properties of goat wool:

[0044] Adopt the method of embodiment 1 to process waste goat hair, the only difference is that the steam flash explosion pressure is 1.3MPa and 1.7MPa respectively, the particle size of the goat hair obtained after treatment is about 36 μ m and 18 μ m respectively, the adsorption performance and crystallization of goat hair index see Figure 4 And Table 1 and Table 2.

[0045] 2. The influence of different flash explosion time on the performance of goat wool:

[0046] Adopt the method of embodiment 1 to process waste goat hair, the only difference is that the steam holding time is 30s, 90s and 240s respectively, the particle size of the goat hair obtained after the treatment is respectively 42 μm, 38 μm, 19 μm, the adsorption performance of goat hair and Crystalli...

Embodiment 3

[0052] Embodiment 3: the reuse of goat hair adsorbent.

[0053] Desorption and repeated adsorption of the goat hair sorbent consisted of the following steps:

[0054] (1) Wash the goat hair after dye adsorption in 0.1g / L NaOH for 30min to achieve desorption;

[0055] (2) Wash the desorbed goat hair with deionized water until neutral, and freeze-dry the collected desorbed goat hair again;

[0056] (3) The goat hair after desorption is repeatedly adsorbed, and the adsorption condition is the same as step three in Example 1, and the results are as follows Image 6 shown. The goat hair adsorbent can repeat the cycle of adsorption and desorption for 5-6 times.

[0057] Depend on Figure 5 It can be seen that the goat hair adsorbent can repeat the adsorption and desorption cycle for 5-6 times.

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Abstract

The invention discloses a method for preparing high-efficiency adsorbent for dyed wastewater from discarded goat wool, and belongs to the field of bio-based adsorption materials. The discarded goat wool is treated by adopting steam flash explosion and liquid nitrogen pulverization. According to the method provided by the invention, the steam flash explosion and liquid nitrogen pulverization technology adopted by the method is a high-efficiency environmentally-friendly pretreatment method, treated goat wool powder particles have a particle size as low as 20 [mu]m and a crystallization index as low as 2.6%, an amorphous region of the goat wool powder is increased, and the adsorption of the goat wool is facilitated; when the goat wool adsorbent prepared by adopting the method adsorbs dye in the dyed wastewater, the dye removal rate can be up to 95%, and the adsorption capability can be up to 426 mg / g, so that the goat wool adsorbent is an excellent biological adsorbent; and the goat wool adsorbent prepared by adopting the method can be used for repeated adsorption-desorption cycle for 5-6 times.

Description

technical field [0001] The invention discloses a method for preparing a high-efficiency dyeing wastewater adsorbent from waste goat hair, and belongs to the field of bio-based adsorbent materials. Background technique [0002] According to data, there are 1.074 billion goats raised in the world, mainly distributed in China, Mongolia, Pakistan and other Asian and African countries. Goats provide both goat hair and cashmere fibers as they grow. Cashmere is a rare and special animal fiber, commonly known as "soft gold" and "fiber gem". Its products are soft, slippery and elegant in style. China's cashmere production and quality both rank first in the world. However, its discarded goat hair has no curl, is rough and hard, and has low utilization value. At present, the reducing agent-formic acid method is mainly used to dissolve and prepare goat hair keratin solution and the like. Due to secondary pollution and high cost, these have not been practically used. Therefore, furth...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/30C02F103/30
CPCB01J20/24C02F1/286B01J2220/4875B01J2220/4856C02F2101/308C02F2103/30
Inventor 侯秀良魏世锦朱莹徐荷澜
Owner JIANGNAN UNIV
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