Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (03): 109-117.doi: 10.13475/j.fzxb.20171202310

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation of photocatalyst loaded activated carbon grafted with polyhydrazide for removing formaldehyde

ZHANG Yian1, DI Jianfeng1,2()   

  1. 1. College of Textile and Clothing, Jiangnan University, Wuxi, Jiangsu 214122, China
    2. College of Textile and Clothing, Wuyi University, Jiangmen, Guangdong 529020, China
  • Received:2017-12-11 Revised:2018-11-05 Online:2019-03-15 Published:2019-03-15
  • Contact: DI Jianfeng E-mail:djfwyu@163.com

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Abstract:

In order to solve the problem of pollution due to formaldehyde, PAH grafted activated carbon (ACm-g-PAH)was prepared by the condensation reaction of grafting polyhydrazide onto nitric acid-modified activated carbon. Then, the self-purifying removal formaldehyde material of Mnx/Agy-TiO2-l-ACm-g-PAH (photocatalyst Mnx/Agy-TiO2 loaded PAH grafted activated carbon) was further assembled to eliminate the possibly secondary pollution by loading Mnx/Agy-TiO2(Mn and Ag co-doped nano-TiO2) on the surface of ACm-g-PAH. The morphology and chemical composition of Mnx/Agy-TiO2-l-ACm-g-PAH were characterized by scanning electron microscopy. And then the catalytic formaldehyde data was fitted to the kinetic equation by software Originpro 8.5 and the dynamic law of catalytic formaldehyde for Mnx/Agy-TiO2-l-ACm-g-PAH was studied. The influences of activation time, activation temperature and N,N-Dicyclohexylcarbodiimide(DCC) concentration on the formaldehyde removal rate of Mnx/Agy-TiO2-l-ACm-g-PAH materials were compared . The test results show that when the activation time is 2 h, the activation temperature is 650 ℃, DCC is 2% of the mass of activated carbon, and PAH is 11 mmol/L, its removal formaldehyde rate of the Mnx/Agy-TiO2-l-ACm-g-PAH is 99.6%. When the formaldehyde concentration loading is in the range of 5-28.2 mg/g, the formaldehyde removal rate of Mnx/Agy-TiO2-l-ACm-g-PAH show a tendency to decrease. After cleaning for 10 cycles, the self-purifying capability of the material is reduced to 12%.

Key words: visible light, formaldehyde removing material, activated carbon, kinetics, photocatalysis

CLC Number: 

  • TS194.5

Fig.1

Scheme of reactor structure"

Fig.2

Influence of activation temperature on formaldehyde removal of Mnx/Agy-TiO2-l-ACm-g-PAH"

Fig.3

Influence of activation time on formaldelye removal of Mnx/Agy-TiO2-l-ACm-g-PAH"

Tab.1

Weight ratio of ACm to Mnx/Agy-TiO2 in formaldehyde removal of Mnx/Agy-TiO2-l-ACm-g-PAH"

ACm与Mnx/Agy-TiO2的质量比 甲醛移除率/%
60∶1 57.2
50∶1 62.6
40∶1 72.8
30∶1 75.5
20∶1 78.8
10∶1 79.7
5∶1 79.3

Fig.4

Influence of concentration of PAH on formaldehyde removal of Mnx/Agy-TiO2-l-ACm-g-PAH"

Fig.5

Influence of mass ratio of DCC on formaldehyde removal of Mnx/Agy-TiO2-l-ACm-g-PAH"

Fig.6

Influence of temperature on formaldehyde removal"

Fig.7

Influence of formaldghyde concentration on formaldehyde removal"

Fig.8

Influence of washing times on formaldehyde removal"

Fig.9

Formaldehyde removal rate of different materials"

Fig.10

SEM images of Mnx/Agy-TiO2-l-ACm-g-PAH and ACm"

Fig.11

FT-IR spectra of PAH and Mnx/Agy-TiO2-l-ACm-g-PAH"

Fig.12

XPS curves of ACm and Mnx/Agy-TiO2-l-ACm-g-PAH"

Tab.2

Surface atom composition of ACm and Mnx/Agy-TiO2-l-ACm-g-PAH"

样本 元素相对含量/% 原子比 结合能/eV
C N O N与C O与C N1s O1s
ACm 97.92 0.12 1.96 0.001 23 0.020 01 418.11 532.44
Mnx/Agy-TiO2-l-ACm-g-PAH 96.38 2.21 1.41 0.022 93 0.014 62 392.16 532.10

Fig.13

XRD patterns of Mnx/Agy-TiO2-l-ACm at activation temperature of 650 ℃"

Tab.3

Photocatalic kinetics of Mnx/Agy-TiO2-ACm-g- PAH in different relative humidities"

时间/
h		 甲醛浓度/(mg·g-1)
相对湿度65% 相对湿度74% 相对湿度82%
0 15.80 15.80 15.80
1 13.20 13.00 13.20
3 13.60 12.60 12.10
5 12.41 11.91 11.43
7 10.78 11.20 10.72
9 10.53 10.53 10.19
10 9.91 9.63 9.23
12 9.14 8.84 8.18
14 8.32 7.52 7.12
16 7.21 6.81 6.16
18 5.84 4.92 4.53
20 4.63 3.63 3.23
22 3.31 2.21 2.03
24 2.72 2.02 1.28

Tab.4

Fitting data of catalytic kinetics of Mnx/Agy-TiO2-l-ACm-g-PAH for formaldehyde removal"

相对湿度/% k R2
45 0.053 75 0.928 2
65 0.059 19 0.961 2
80 0.063 91 0.995 5
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