CN-121974435-A - Wastewater adsorption purification method for modified blue algae biochar loaded nano material

CN121974435ACN 121974435 ACN121974435 ACN 121974435ACN-121974435-A

Abstract

The invention relates to the technical field of water treatment and discloses a wastewater adsorption purification method for a modified blue algae biochar loaded nano material, which comprises the steps of placing blue algae powder loaded with nano active material precursors under inert atmosphere, performing stepped heating pyrolysis, performing in-situ pore forming by utilizing instantaneous internal pressure decomposed and separated from endogenous lipids of blue algae to generate a hierarchical pore channel structure, inducing polysaccharide components to react with the nano active material to construct a heteroatom doped modification layer, adding a product into a wastewater system, applying a pulse magnetic field, utilizing the electrical selectivity of the modification layer to inhibit interference ion competitive adsorption, utilizing asynchronous displacement difference of the nano active material and a carbonization framework to generate microseismic shear force, and stripping a deposited passivation film of an adsorption interface.

Inventors

FANG LI
CHEN LIN
XU WEI
ZHU BANGHUI
WANG JUAN
YANG JIAN
Zhao Meifei
CHEN RANNI
WANG YAN

Assignees

长沙环境保护职业技术学院

Dates

Publication Date: 20260505
Application Date: 20260324

Claims (10)

1. A wastewater adsorption purification method for modified blue algae biochar loaded nano materials comprises the following steps: Step S101, performing crushing treatment on blue algae biomass to obtain blue algae powder; Step S102, blue algae powder is immersed in a solution containing a precursor of a nano active substance, and ultrasonic dispersion and solid-liquid separation treatment are carried out to obtain a blue algae matrix loaded with the precursor; Step S103, the blue algae matrix loaded with the precursor is placed in an inert atmosphere to execute the step heating pyrolysis procedure of the first stage /Min to The temperature rise rate per min is To the point of Preserving heat in the temperature range, flushing inside the carbonized skeleton to form a hierarchical pore structure by utilizing the instantaneous expansion internal pressure generated by the decomposition of endogenous lipid components in the blue algae matrix loaded with the precursor, and heating in the second stage To the point of Performing graphitization transformation, inducing nitrogen-containing polysaccharide components in the carbonized skeleton to perform thermochemical reaction with the nano active substance, and generating a heteroatom doped modification layer on the surface of the hierarchical pore structure in situ; Step S104, adding the pyrolysis product generated in the step S103 into a wastewater system, applying an intermittent pulse magnetic field by using a magnetic field generating device, blocking non-target interfering ions and guiding target heavy metal ions into the interior of the hierarchical pore structure by using the electrostatic selectivity of the heteroatom doped modification layer to wastewater ions, and stripping a passivation film deposited on the surface of the pyrolysis product by using the asynchronous thermal expansion displacement difference of the nano active substance and the carbonization framework under the action of the intermittent pulse magnetic field to generate microseismic shearing force at an adsorption interface.
2. The method for adsorbing and purifying wastewater with modified blue algae charcoal loaded with nanomaterial according to claim 1, wherein the step-heating pyrolysis procedure performed in step S103 further comprises a cooling step after the end of heat preservation, the cooling step being performed by /Min to The rate of/min is reduced for maintaining the geometric stability of the hierarchical pore structure and limiting the particle size of the nano-active material.
3. The method for adsorbing and purifying wastewater of the modified blue algae biochar loaded nano material according to claim 1, wherein the precursor of the nano active substance in the step S102 comprises one or more of a zero-valent iron salt, a manganese sulfide salt or a nano metal oxide salt, and the step S103 is to limit the distribution density of active sites in the heteroatom doped modification layer by adjusting the molar ratio of nitrogen element to the nano active substance in the blue algae matrix loaded with the precursor.
4. The method for adsorbing and purifying wastewater by using modified blue algae biochar loaded nano materials according to claim 1, wherein the magnetic induction intensity of the intermittent pulsed magnetic field in step S104 is T to T, pulse frequency is Hz to Hz。
5. The method for adsorbing and purifying wastewater by using the modified blue algae biochar loaded nano material according to claim 1, wherein the temperature interval in the first stage of the step S103 is selected by obtaining a thermal weight change curve of blue algae biomass, and setting the maximum weightlessness peak temperature of the lipid component decomposition rate in the thermal weight change curve as the center temperature of the heat preservation stage.
6. The method for adsorbing and purifying wastewater of a modified blue algae biochar loaded nano material according to claim 1, wherein the heteroatom doped modification layer comprises an electron cloud offset structure formed by co-doping source nitrogen and phosphorus, and the electron cloud offset structure is used as an interface electron donor to slow down the oxidation rate of nano active substances.
7. The method for adsorbing and purifying wastewater by using the modified blue algae biochar loaded nano material according to claim 1, wherein the step S101 further comprises the step of carrying out deashing treatment on blue algae powder by using an inorganic acid solution.
8. The method for adsorbing and purifying wastewater by using modified blue algae biochar loaded nano materials according to claim 1, wherein step S104 is performed by acquiring the conductivity value of the wastewater system through the monitoring device in the wastewater purification process, and adjusting the pulse duty ratio of the magnetic field generating device according to the change rate of the conductivity value with time.
9. The method for adsorbing and purifying wastewater by using modified blue algae biochar loaded nano materials according to claim 1, wherein the selective adsorption performance of the heteroatom doped modification layer on target heavy metal ions is achieved through a selectivity coefficient Evaluation of selectivity coefficient The following formula is satisfied: , wherein, For the equilibrium adsorption quantity of the pyrolysis product to the target heavy metal ions, Is the equilibrium concentration of the target heavy metal ions in the wastewater, To balance the adsorption of interfering ions by the pyrolysis products, Is the equilibrium concentration of interfering ions in the wastewater.
10. The method for adsorbing and purifying wastewater of the modified blue algae biochar loaded nano material according to claim 1, wherein the purified pyrolysis product is subjected to magnetic separation and then subjected to regeneration treatment, and micro-area fluid disturbance is generated inside the graded pore structure in the regeneration treatment process through intermittent pulse magnetic field induction.

Description

Wastewater adsorption purification method for modified blue algae biochar loaded nano material Technical Field The invention relates to a wastewater adsorption purification method for a modified blue algae biochar loaded nano material, and belongs to the technical field of water treatment. Background The current composite material formed by taking biochar as a carrier to load an active nano material is the current mainstream technology, the nano particles are anchored by utilizing a micropore structure on the surface of the biochar, water pollutants are removed through physical adsorption and chemical reaction, industrial wastewater generally contains high-concentration calcium ions, magnesium ions and other non-target interference ions, and as the functional groups on the surface of the biochar lack electrical identification capability on the ions, the interference ions occupy a large number of adsorption sites, and meanwhile, organic macromolecules in the wastewater are easy to form passivation films on an adsorption interface to block graded pore channels of a carbon-based material, so that the mass transfer resistance of the pollutants to the internal active sites is increased. In order to maintain the treatment effect, the conventional method generally adopts linear improvement paths such as increasing the dosage of a medicament or executing secondary chemical activation, and the like, the dosage of the medicament is increased to generate a large amount of waste sludge and increase the treatment cost, the limited domain structure between the nano particles and the carbon skeleton is destroyed in the strong acid or strong alkali activation process to cause the falling of active components, and under the pressure of complex working conditions, the adsorption selectivity, the interface passivation resistance property and the physical stability of a carrier structure are difficult to be considered in the prior art, for example, although the Chinese patent application with the authority of CN114105290B discloses a preparation method and application of a modified blue algae charcoal loaded nano zero-valent iron material, the loaded nano zero-valent iron promotes the reduction activity to assist the denitrification of a bioelectrochemical system, but the adsorption surface is still blocked by non-target components in the face of the working conditions of high salinity and colloid organic matters. Therefore, how to utilize the endogenous components of blue algae biomass to perform in-situ modification solves the competitive adsorption of non-target ions by constructing an interface structure with an identification function, and constructs an intercommunication mass transfer channel by utilizing an endogenous pressure release mechanism so as to overcome the performance attenuation caused by interface passivation, so that the invention becomes the technical problem to be solved. Disclosure of Invention In order to solve the problems in the background technology, the technical scheme of the invention is as follows, the wastewater adsorption purification method of the modified blue algae biochar loaded nano material comprises the following steps: Step S101, performing crushing treatment on blue algae biomass to obtain blue algae powder; Step S102, blue algae powder is immersed in a solution containing a precursor of a nano active substance, and ultrasonic dispersion and solid-liquid separation treatment are carried out to obtain a blue algae matrix loaded with the precursor; Step S103, the blue algae matrix loaded with the precursor is placed in an inert atmosphere to execute the step heating pyrolysis procedure of the first stage /Min toThe temperature rise rate per min isTo the point ofPreserving heat in the temperature range, flushing inside the carbonized skeleton to form a hierarchical pore structure by utilizing the instantaneous expansion internal pressure generated by the decomposition of endogenous lipid components in the blue algae matrix loaded with the precursor, and heating in the second stageTo the point ofPerforming graphitization transformation, inducing nitrogen-containing polysaccharide components in the carbonized skeleton to perform thermochemical reaction with the nano active substance, and generating a heteroatom doped modification layer on the surface of the hierarchical pore structure in situ; Step S104, adding the pyrolysis product generated in the step S103 into a wastewater system, applying an intermittent pulse magnetic field by using a magnetic field generating device, blocking non-target interfering ions and guiding target heavy metal ions into the interior of the hierarchical pore structure by using the electrostatic selectivity of the heteroatom doped modification layer to wastewater ions, and stripping a passivation film deposited on the surface of the pyrolysis product by using the asynchronous thermal expansion displacement difference of the nano active substance and the carboniz