CN103962103A

CN103962103A - Method for preparing adsorbing material from lotus seed hulls and application of adsorbing material

Info

Publication number: CN103962103A
Application number: CN201410195005.4A
Authority: CN
Inventors: 张慧; 莫铭恩; 张学洪; 郑刘春
Original assignee: Guilin University of Technology
Current assignee: Guilin University of Technology
Priority date: 2014-05-11
Filing date: 2014-05-11
Publication date: 2014-08-06
Anticipated expiration: 2034-05-11
Also published as: CN103962103B

Abstract

The invention discloses a method for preparing an adsorbing material from lotus seed hulls and application of the adsorbing material. The method comprises the following steps: (1) cleaning, namely sequentially cleaning the lotus seed hulls by tap water and deionized water so as to remove dust on the surfaces of the lotus seed hulls and pulp in the hulls; (2) drying, namely naturally air-drying the lotus seed hulls cleaned by the step (1); and (3) crushing, namely crushing the lotus seed hulls dried by the step (2) through a crushing machine till crushed lotus seed hulls can pass through a sieve with 10-60 meshes, thereby obtaining the adsorbing material. The adsorbing material is applied to treatment of acid polluted water with Cr (III) ion concentration below 50mg/L. The method has the simple steps, can fully utilize agricultural waste, namely lotus seed hulls, and is suitable for large-scale popularization and application. The prepared adsorbing material has a good adsorption capacity and is wide in adaptability to temperature, and the removal rate changes a little at the temperature of 30-50 DEG C.

Description

A kind of method and application thereof that utilizes lotus seed shell to prepare sorbing material

Technical field

The invention belongs to science adsorption technology field, particularly a kind of method and application thereof that utilizes lotus seed shell to prepare sorbing material.

Background technology

It is the main cause that causes China's surface water body chromium severe contamination that a large amount of chromate waste waters is discharged in the industry such as plating, leather tanning and timber processing in process of production.Cr (III) can not be degraded in environment, and along with food chain enrichment in human body, serious harm health.

The main method of processing at present the Cr (III) in water is reduction precipitation method, ion-exchange and hyperfiltration etc., but general processing cost is higher.Therefore utilize the materials such as agricultural wastes to become the emphasis of research as the low cost sorbing material of trivalent chromium metal ion, not only with low cost, there is good adsorption effect simultaneously.

Lotus seeds are one of China industrial crops, the characteristic high-quality resource that Ye Shi China is important, and annual production is about 100,000 tons.And as the byproduct of lotus seed food industry, a large amount of lotus seed shells produces in lotus seeds process, but these resource long-terms do not obtain reasonable development, except minority is cultivated for mushroom, all be dropped in a large number or burn, being not only the waste to resource, having polluted environment simultaneously.

Summary of the invention

The object of the invention is for above-mentioned mentioned problem, make full use of lotus seed shell and prepare a kind of well behaved environment adsorbing materials, recycle this sorbing material and effectively remove the Cr (III) in water, thereby realize the recycling of lotus seed shell.

Concrete steps are:

(1) clean: use successively running water and washed with de-ionized water lotus seed shell, to remove pulp in the dust of lotus seed shell surface attachment and shell.

(2) dry: the lotus seed shell that will clean through step (1) is dry 12 ~ 20 hours or natural air drying in the baking oven of 50 ~ 70 DEG C.

(3) pulverize: by being crushed to 10 ~ 60 orders through the dry lotus seed shell of step (2) by pulverizer, make sorbing material.

Sorbing material prepared by the inventive method is applied to processes the acid pollution water body of Cr (III) ion concentration below 50mg/L.

The inventive method step is simple, can make full use of agricultural wastes lotus seed shell, is easy to large-scale promotion application; Prepared sorbing material has good adsorption capacity, and extensive to the adaptability of temperature, changes little at 30 ~ 50 DEG C of clearances.

Brief description of the drawings

Fig. 1 is the variation relation figure of Cr in the embodiment of the present invention (III) clearance with pH value.

Fig. 2 is the variation relation figure of Cr in the embodiment of the present invention (III) clearance with sorbing material dosage.

Fig. 3 is the variation relation figure of Cr in the embodiment of the present invention (III) clearance with adsorption time.

Fig. 4 is the adsorption capacity of sorbing material in the embodiment of the present invention and the graph of a relation of Cr (III) initial concentration.

Detailed description of the invention

embodiment:

Utilize lotus seed shell to prepare a method for sorbing material, concrete steps are:

(2) dry: the lotus seed shell natural air drying that will clean through step (1).

Sorbing material prepared by the present embodiment is applied to processes Cr (III) ionic soil water body, and concrete condition is as follows:

The impact of a.pH value on Cr (III) clearance.

Regulating Cr (III) is different pH values (1 ~ 4), be under 50mg/L condition at Cr (III) initial concentration, the dosage of sorbing material is 2.0g/L, and 30 DEG C of vibration 24h, measure the impact of pH value on sorbing material absorption Cr (III).As can be seen from Figure 1, be 5 o'clock at pH, lotus seed shell is the strongest to the suction-operated of Cr (III), and after absorption 24h, Cr (III) clearance is 58.08%, and adsorption capacity is 14.66mg/g; Be 1 o'clock at pH, Cr (III) clearance is subject to larger restriction, is only 2.16%, illustrates that sorbing material is conducive to the Cr (III) in Adsorption water under partial neutral condition.

B. the impact of sorbing material dosage on Cr (III) clearance.

In Cr (III) solution that is 50mg/L at 50mL, initial concentration respectively, add 0.05 ~ 0.45g sorbing material, at 30 DEG C of vibration 24h, measure the impact of sorbing material dosage on Cr (III) clearance.As can be seen from Figure 2, along with the increase of sorbing material dosage, the clearance of Cr in solution (III) also increases accordingly, until dosage is 0.40g, when 8.0g/L, it is the highest that clearance reaches, and is 96.64%.Show that sorbing material dosage increases the clearance that can improve Cr (III), in the time that dosage is more than or equal to 6.0g/L, clearance, higher than 90%, reaches as high as 96.64%.

C. the impact of adsorption time on Cr (III) clearance.

In Cr (III) solution that is 50mg/L at 50mL, initial concentration, add 0.10g sorbing material, under 30 DEG C of conditions, vibrate, investigate the impact of adsorption time on Cr (III) clearance.As can be seen from Figure 3, along with the increase of adsorption time, the clearance of Cr in solution (III) also increases accordingly, and when duration of oscillation is 12 days, Cr (III) clearance reaches 57.92%, and adsorption capacity is 15.17mg/g.

D. the impact of initial concentration solution on sorbing material adsorption capacity.

In 50mL, initial concentration are respectively Cr (III) solution of 5 ~ 200mg/L, add 0.10g sorbing material, 30 DEG C, 40 DEG C and 50 DEG C of vibrations 12 days, investigate the impact of initial concentration solution on Cr (III) clearance.As can be seen from Figure 4, the clearance of Cr in solution (III) reduces along with the increase of initial concentration, and in the time that initial concentration is 5mg/L, the clearance of Cr in solution (III) is 90.64%; And in the time that initial concentration is 200mg/L, clearance is 19.41%, and now adsorption capacity is 19.67mg/g.

Claims

1. utilize lotus seed shell to prepare a method for sorbing material, it is characterized in that concrete steps are:

(1) clean: use successively running water and washed with de-ionized water lotus seed shell, to remove pulp in the dust of lotus seed shell surface attachment and shell;

(2) dry: the lotus seed shell natural air drying that will clean through step (1);

2. the application of the sorbing material of preparing according to the method for claim 1, is characterized in that this sorbing material is applied to the acid pollution water body of processing Cr (III) ion concentration below 50mg/L.