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Modified attapulgite adsorbent and preparation method thereof

A technology for modifying attapulgite and attapulgite powder is applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc. Increased specific surface area, good removal effect

Inactive Publication Date: 2019-09-03
MINGGUANG FEIZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two modification methods can improve the adsorption capacity of attapulgite to pollutants, the adsorption of phosphorus in phosphorus-containing wastewater still needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a preparation method of modified attapulgite adsorbent 1, comprising the following steps:

[0025] S1. Pretreatment: After crushing and grinding the attapulgite, the attapulgite powder is obtained for use;

[0026] S2. Acid modification: disperse the attapulgite powder obtained in step S1 and a hydrochloric acid solution with a concentration of 2 mol / L with an ultrasonic disperser at a constant temperature of 20°C for 2 hours, and the mass ratio of the attapulgite powder to the hydrochloric acid solution is 1:10, wash with ultrapure water until neutral, dry in vacuum at 100°C, and set aside;

[0027] S3. Thermal modification: calcining the acid-modified attapulgite powder obtained in step S2 at a temperature of 550° C. for 2 hours, passing through a 200-mesh sieve after natural cooling, and set aside;

[0028] S4. Lanthanum modification: add the acid-heat modified attapulgite powder obtained in step S3 into the lanthanum nitrate solution at a c...

Embodiment 2

[0034] This embodiment provides a preparation method of modified attapulgite adsorbent 2, comprising the following steps:

[0035] S1. Pretreatment: After crushing and grinding the attapulgite, the attapulgite powder is obtained for use;

[0036] S2. Acid modification: disperse the attapulgite powder obtained in step S1 and a hydrochloric acid solution with a concentration of 3 mol / L with an ultrasonic disperser at a constant temperature of 20°C for 2 hours, and the mass ratio of the attapulgite powder to the hydrochloric acid solution is 1:10, wash with ultrapure water until neutral, dry in vacuum at 105°C, and set aside;

[0037] S3. Thermal modification: calcining the acid-modified attapulgite powder obtained in step S2 at a temperature of 750° C. for 2 hours, passing through a 200-mesh sieve after natural cooling, and set aside;

[0038]S4. Lanthanum modification: add the acid-heat modified attapulgite powder obtained in step S3 into the lanthanum nitrate solution at a co...

Embodiment 3

[0044] This embodiment provides a preparation method of modified attapulgite adsorbent 3, comprising the following steps:

[0045] S1. Pretreatment: After crushing and grinding the attapulgite, the attapulgite powder is obtained for use;

[0046] S2. Acid modification: disperse the attapulgite powder obtained in step S1 and a hydrochloric acid solution with a concentration of 4mol / L at a constant temperature of 20°C for 2 hours with an ultrasonic disperser, and the mass ratio of the attapulgite powder to the hydrochloric acid solution is 1:10, wash with ultrapure water until neutral, dry in vacuum at 110°C, and set aside;

[0047] S3. Thermal modification: calcining the acid-modified attapulgite powder obtained in step S2 at a temperature of 850° C. for 2 hours, passing through a 200-mesh sieve after natural cooling, and setting aside;

[0048] S4. Lanthanum modification: add the acid-heat modified attapulgite powder obtained in step S3 into the lanthanum nitrate solution at ...

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Abstract

The invention belongs to the technical field of adsorbent materials, and particularly relates to a modified attapulgite adsorbent and a preparation method thereof. The preparation method comprises: S1, pretreatment: breaking attapulgite, and grinding to obtain attapulgite powder; S2, acid modification: dispersing the attapulgite powder obtained in the step S1 in a hydrochloric acid solution for 2h at a constant temperature of 20 DEG C, washing with ultrapure water to achieve a neutral state, and carrying out vacuum drying at a temperature of 100-110 DEG C so as to be spare; S3, thermal modification: calcining the acid-modified attapulgite powder obtained in the step S2 for 2 h at a temperature of 550-850 DEG C, naturally cooling, and screening with a 200 mesh sieve so as to be spare; andS4, modification with lanthanum: adding the modified attapulgite powder obtained in the step S3 in a lanthanum nitrate solution at a constant temperature of 20 DEG C, impregnating for 2 h, dispersingfor 2 h, washing with ultrapure water to remove residual lanthanum ions, carrying out vacuum drying at a temperature of 100-110 DEG C, and screening with a 230 mesh sieve. According to the present invention, the modified attapulgite adsorbent can effectively remove phosphorus from wastewater.

Description

technical field [0001] The invention belongs to the technical field of adsorbent materials, and in particular relates to a modified attapulgite adsorbent and a preparation method thereof. Background technique [0002] Phosphorus in phosphorus-containing wastewater mainly exists in the form of phosphate, which mainly comes from production wastewater and domestic sewage containing pesticides, fertilizers and detergents. As one of the key factors causing water eutrophication, the treatment of phosphorus-containing wastewater has always been the focus of research in the field of water environment governance. The process of phosphorus removal by adsorption is simple and easy to operate. Compared with biological phosphorus removal and chemical precipitation phosphorus removal, it has the characteristics of high adsorption efficiency and wide application range, and is attracting more and more attention. Attapulgite is an important inorganic non-metallic mineral. It has a three-dim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F101/10
CPCB01J20/0207B01J20/0296B01J20/12B01J2220/42B01J2220/4806C02F1/281C02F2101/105
Inventor 胡睿顾文宇
Owner MINGGUANG FEIZHOU NEW MATERIAL
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