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Modification method of corncobs, modified product of corncobs and application of modified product

A corncob, corncob flour technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of underutilization and waste of resources, and achieve excellent physical adsorption and chemical properties

Inactive Publication Date: 2016-05-25
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resource of corncob has not been well utilized, and most of them are burned in vain, causing a lot of waste. As an agricultural waste product rich in plant fiber, corncob has the characteristics of economic effectiveness and environmental protection. , the rich cellulose and lignin contained in it can be modified to become an adsorbent material with low price and simple preparation method

Method used

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  • Modification method of corncobs, modified product of corncobs and application of modified product
  • Modification method of corncobs, modified product of corncobs and application of modified product
  • Modification method of corncobs, modified product of corncobs and application of modified product

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Effect test

Embodiment 1

[0032] The modification method of embodiment 1 corn cob, the steps are:

[0033] (1) After chopping the corncobs, mix them with tap water and mash them, wash and soak the slag with tap water, remove suspended fine substances and soluble substances, air-dry at room temperature after filtering, and pass through a 0.5mm sieve to obtain dry corncobs;

[0034] (2) According to the volume ratio of solid-liquid ratio 1:5, (also can be 1:8, or 1:10), dry agricultural by-products and concentration are 2mol / L (also can be 1.5mol / L, or 1mol / ) L phosphoric acid solution is mixed evenly, soaked in a water bath at 40°C for 2 hours, and filtered;

[0035] (3) drying the filtered corncob phosphoric acid mixture at a temperature of 30 to 70°C for 2 to 5 hours, and then drying at a temperature of 110 to 150°C for 1.5 to 4 hours;

[0036] (4) The dried material is repeatedly washed with deionized water to PH=7;

[0037] (5) Dry the neutral material at a temperature of 30-50°C, and the obtaine...

Embodiment 2

[0038] Embodiment 2 modified material adsorption test:

[0039] Add 100mL of 500mg / L malachite green solution to each of ten 250mL Erlenmeyer flasks, then add different amounts of modified corncobs and unmodified corncobs, and shake the malachite green solution with quantitative corncobs After adsorption, directly absorb the supernatant, dilute a certain multiple, measure its absorbance value at a wavelength of 617nm with a spectrophotometer, and calculate its adsorption rate by measuring the concentration of the malachite green solution after 4 hours of adsorption. Compared. Calculated as follows:

[0040] T % = C 0 - C t C 0 × 100 % ; q = C 0 ...

Embodiment 3

[0045] Embodiment 3 modified material isothermal adsorption experiment:

[0046] A series of 100mL malachite green solutions of different concentrations were added to a 250mL conical flask, the pH was controlled at 7.0, and 0.1g of modified corn cob adsorbent was added to the conical flask, which was shaken and adsorbed in a constant temperature water bath shaking box for 4h. Ensure that malachite green solutions of different concentrations are adsorbed and saturated, then take the supernatant and dilute it by a certain number of times to measure its absorbance, calculate the remaining malachite green concentration through the standard curve, and finally use the equilibrium mass concentration C e The equilibrium adsorption capacity qe is plotted to obtain the isotherm adsorption line of the modified corn cob to malachite green, such as Figure 6 shown, and fitted by the Langmuir adsorption equation and the Freundlich adsorption equation. The Langmuir fitting results of malach...

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Abstract

The invention discloses a modification method of corncobs, a modified product of the corncobs and application of the modified product and belongs to the technical field of modified materials. The modification method of the corncobs comprises the following steps: (1) chopping the corncobs and mixing the corncobs with tap water, and mashing; washing and immersing crushed residues with the tap water; removing suspended fine substances and soluble matters; after filtering, drying with air at a room temperature and sieving; (2) uniformly mixing a sieved matter and a phosphoric acid solution, immersing with a water bath and then filtering; (3) drying at 30-70 DEG C and 110-150 DEG C in sequence; (4) washing until the pH value is equal to 7; and (5) drying. With the adoption of the method disclosed by the invention, the reutilization of the agricultural waste corncobs is realized; and active groups on the surfaces of particles can be increased and uneven and porous structures can be formed on the surfaces of the particles, so that the modified material has excellent physical absorption and chemical properties, and the adsorption rate is averagely improved by about 24%-40%.

Description

technical field [0001] The invention belongs to the technical field of modified materials, and in particular relates to a modification method, product and application of corn cobs. technical background [0002] As a large agricultural country, my country's corn production can reach 110-130 million tons per year, and 20 million tons of corn cobs can be produced by-product every year. However, the resource of corncob has not been well utilized, and most of them are burned in vain, causing a lot of waste. As an agricultural waste product rich in plant fiber, corncob has the characteristics of economic effectiveness and environmental protection. , the rich cellulose and lignin contained in it can be modified to become an adsorption material with low price and simple preparation method. [0003] Chinese patent 2015101295885 discloses a NaHSO 3 and (NH 4 ) 2 S 2 o 8 The preparation method of the corncob modified material prepared as an initiator. Chinese patent 201210544428...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/58C02F101/30
CPCB01J20/24B01J2220/4875C02F1/286C02F1/58C02F2101/308
Inventor 梁维新张敏黄艳荧
Owner FOSHAN UNIVERSITY
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