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Sludge biochar loaded magnesium-iron oxide composite material for removing lead and cadmium in water as well as preparation method and application thereof

A composite material, biochar technology, applied in water pollutants, chemical instruments and methods, water/sludge/sewage treatment, etc. problem, to achieve the effect of superior physical and chemical properties, strong adsorption and removal capacity, and high-efficiency removal

Active Publication Date: 2021-11-12
GUANGDONG UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LDHs have a good adsorption effect on various inorganic anions and organic anions in water, and have great development potential as adsorbents in water treatment applications. However, LDHs also have some defects, and the mechanical strength of pure phase LDHs prepared in the laboratory is not high. , cannot be applied in batches to actual sewage treatment; and LDHs are in the form of powder, which is prone to agglomeration and difficult solid-liquid separation during the treatment process, which greatly affects the adsorption effect of the material

Method used

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  • Sludge biochar loaded magnesium-iron oxide composite material for removing lead and cadmium in water as well as preparation method and application thereof
  • Sludge biochar loaded magnesium-iron oxide composite material for removing lead and cadmium in water as well as preparation method and application thereof
  • Sludge biochar loaded magnesium-iron oxide composite material for removing lead and cadmium in water as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing sludge biochar-loaded magnesium-iron oxide composite materials for efficient removal of lead and cadmium in water, the flow diagram is as follows figure 1 shown, including the following steps:

[0035] (1) Preparation of sludge biochar: Dry the dehydrated municipal sludge at 105°C for 24 hours, save it for later use; weigh 5g of sludge and mix it with 10ml of potassium hydroxide solution containing 3.33g, let it stand for 6 hours Dry it in an oven at 105°C, and grind it through a 100-mesh sieve. The resulting substance was placed in a tube furnace, under nitrogen protection conditions (nitrogen flow rate 80mL min -1 ), at a heating rate of 6.24℃·min -1 Carbonize at 630°C for 45min at a certain temperature, then cool to room temperature under nitrogen protection; then take out the sample, wash it several times with distilled water to make the filtrate neutral, dry it at 105°C, crush it through a 100-mesh sieve, and obtain sludge bio Charcoal, sa...

Embodiment 2

[0038] A dose of 0.05g of the obtained sludge biochar-loaded magnesium-iron oxide composite material in Example 1 was added to the cadmium solution and the lead solution of 100ml 100mg / L respectively, and the pH was adjusted with 0.1mol / L of HCl and NaOH solution If it is 5, place it at 25°C and shake it at a constant temperature, take samples at the set time (5-1440min), pass through a 0.45μm water filter membrane, measure the remaining concentration under the flame atomic adsorption spectrophotometer, and calculate the adsorption amount.

[0039] Depend on figure 2 It can be seen that the adsorption amount of lead and cadmium by the sludge biochar-loaded magnesium-iron oxide composite material increases with time. At 1440min, the adsorption amount of lead is 185.34mg / g, and the removal rate is 92.67%. The adsorption capacity is 155.42 mg / g, and the removal rate is 77.71%.

Embodiment 3

[0041] A dose of 0.05g of the obtained sludge biochar-loaded magnesium-iron oxide composite material in Example 1 was added to the cadmium solution and the lead solution of 100ml 40-500mg / L respectively, and the HCl and NaOH solution of 0.1mol / L Adjust the pH to 5, place at 15-35°C for constant temperature oscillation, take a sample after the reaction is balanced, pass through a 0.45 μm water filter membrane, measure the remaining concentration under the flame atomic adsorption spectrophotometer, and calculate the adsorption amount.

[0042] Depend on image 3 (a) and image 3 (b) It can be seen that when the sludge biochar-supported magnesium-iron oxide composite material is used as the adsorbent, its adsorption capacity for lead and cadmium increases with the increase of the concentration and temperature of lead and cadmium. At 35°C, the maximum adsorption capacity for lead reaches 440.48 mg / g, and the maximum adsorption capacity for cadmium reaches 348.5 mg / g.

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Abstract

The invention belongs to the technical field of preparation of water treatment materials, and discloses a sludge biochar loaded magnesium-iron oxide composite material for removing lead and cadmium in water as well as a preparation method and application thereof. The preparation method comprises the following steps of: uniformly dipping municipal sludge in an activator, drying, and carrying out pyrolysis treatment in an inert gas atmosphere to obtain sludge biochar; and well mixing the sludge biochar with Mg < 2 + > and Fe < 3 + > solutions by dripping, carrying out hydrothermal reaction, separating to obtain a solid substance, and carrying out secondary pyrolysis to obtain a sludge biochar loaded magnesium-iron oxide composite material. The material prepared by the invention has excellent physical and chemical characteristics, has relatively strong adsorption and removal capability on lead and cadmium in water, the maximum adsorption capacities of cadmium and lead at 35 DEG C respectively reach 348.5 mg / g and 440.48 mg / g, and meanwhile, an effective new way is provided for recycling of sludge waste.

Description

technical field [0001] The invention belongs to the technical field of preparation of water treatment materials, in particular to a sludge biochar-loaded magnesium-iron oxide composite material for removing lead and cadmium in water, a preparation method and application thereof. Background technique [0002] With the development of industry and the overexploitation of available resources, a large amount of heavy metal elements have entered water bodies. Heavy metal elements such as cadmium and lead are highly toxic, non-biodegradable, persistent and bioaccumulative, causing great harm to my country's ecological environment and human health. The removal methods of heavy metals include adsorption method, chemical precipitation method, electrodialysis method, membrane filtration and biological method, etc. Among them, adsorption method has become the most popular water treatment technology because of its convenient operation process, high treatment efficiency and wide applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/06C02F1/281C02F1/283C02F2101/20Y02W10/40
Inventor 周佳丽林伟雄孙水裕关智杰曾刘婷黄振华高建明戴文灿
Owner GUANGDONG UNIV OF TECH
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