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Preparation of Zn-Doped Amino Functionalized Biochar from Hazardous Waste…
Preparation of Zn-Doped Amino Functionalized Biochar from Hazardous Waste for Arsenic Removal
Background
Sludge
Carbonized by microwave carbonization
Chemically activated at high temp
+Use ZnCl2
To enhance porosity and surface area
Combined with the As species after reacting with Zn-SBC-DETA, the As transformation and adsorption mechanism are also discussed.
detect
Detail
SEM
thermalgravimetric analysis(熱重分析)
Nitrogen adsorption& Desorption
Result
Zn-SBC-DETA
surface area 525 m2 g−1
average pore volume0.35 cm3 g−1
uniform pore size.
As(III)
highest adsorption efficiency
79% at pH 3
adsorption capacity of 0.84 mg g-1
As(V
)*
adsorption efficiency98% at pH 3
adsorption capacity of1.43 mg g-1
:warning: Adsorption data describe by Langmuir Not Frendulich
Preparation
Zn-SBC-DETA
different amounts of ZnCl2 (including 33, 5, 60, and 67%) and diethylenetriamine (DETA) were dissolved in 150 mL of distilled water.
2.10 g of the as-synthesized carbonized sludge was mixed with DETA and ZnCl2 solution, and stirred at 85 ± 5 C for 2 h.
dehydrated in an oven at 110±5 C for 24 h
pyrolyzed in a horizontal tubular furnace under nitrogen flow at 45 ± 5 C for 2 h.
adsorbents (such as 33%Zn-SBC-DETA, 50%Zn-SBC-DETA, 60%Zn-SBC-DETA and 67%Zn-SBC-DETA) was rinsed with warm distilled water until neutral pH and dried at 100 ± 5 C in an oven for approximately 12 h.
6.Adsor- bents production yields were calculated from the weight of adsorbents divided by the weight of the dried as- synthesized carbonized sludge.
7.
surface area, pore size distribution, and pore vol- ume were determined by nitrogen adsorption–desorption measurements (BET)
morphology of Zn- SBC-DETA was measured by field-emission scanning electron microscopy (SEM) analysis and thermo gravimet- ric analysis (TGA).