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IIT Delhi Researchers Develop Modified Cotton Fabric Which Adsorbs Air Pollutants From Air

ZIF-8@CM Cotton and ZIF-67@CM Cotton, as they are called, are Zeolite Imidazolate Framework (ZIF)-modified functionalised fabrics which adsorb high levels of organic air pollutants like benzene, aniline, and styrene from the ambient air

IIT Delhi Researchers Develop Modified Cotton Fabric Which Adsorbs Air Pollutants From Air
Highlights
  • These fabrics can easily be regenerated by heating at 120°C: Researchers
  • “Fabrics can be reused without any decrease in their adsorption capacity”
  • These fabrics can withstand even harsh conditions of washing, said the team

New Delhi: Researchers at the Indian Institute of Technology (IIT) Delhi have developed a modified cotton fabric capable of adsorbing harmful air pollutants. ZIF-8@CM Cotton and ZIF-67@CM Cotton, as they are called, are Zeolite Imidazolate Framework (ZIF)-modified functionalised fabrics which adsorb high levels of organic air pollutants like benzene, aniline, and styrene from the ambient air. According to the research team, air pollution resulting from the rising levels of particulate matter, nitrous oxides, sulphur oxides, carbon oxides, and other toxic volatile organic compounds (VOCs) is a major concern. A long-term exposure to even a few parts per million of these chemicals takes a toll on health and can cause asthma, and eye and throat irritations etc.

Also Read: Smog Towers ‘Quick Fix’, No Scientific Evidence They Tackle Pollution Long-Term: Experts

In this study, we have shown the functionalisation of cotton fabric by ZIF MOFs (ZIF-8 and ZIF-67) using a rapid, facile, eco-friendly, and scalable approach. The ZIF functionalised textiles possess a huge potential for applications as protective garments and in controlling indoor air pollution. These fabrics may be used as upholstery for controlling gaseous pollutants that cannot be filtered out using a filter media. In particular, these can be used within closed spaces such as homes, offices, theatres, aeroplanes and other transport vehicles, said Ashwini Agrawal of the Textile and Fibre Engineering Department, IIT Delhi.

The ZIF-8 functionalised fabric was found to adsorb a maximum of 19.89 mg/g of aniline, 24.88 mg/g of benzene, and 11.16 mg/g of styrene on the weight of the fabric. These fabrics could be easily regenerated by heating the fabrics at 120 degrees Celsius and reused without any decrease in their adsorption capacity for several cycles, the team said.

Also Read: Air Quality Commission Asks NCR States To Adopt ISRO’s Protocol For Farm Fire Estimation

Using a technique known as in-situ growth of ZIF-8 and ZIF-67 nanocrystals on the carboxymethylated cotton fabric using a rapid water-based textile finishing approach, the researchers at IIT Delhi have successfully developed a low-cost cotton fabric capable of adsorbing 400-600 per cent more VOCs than ordinary cotton fabrics.

Further, these fabrics are robust and can withstand even the harsh conditions of washing. They can be used repeatedly and in designing functional filters and pollution controlling upholstery fabrics among others.

Also Read: Nitrogen Dioxide’s Levels In Delhi Increased By 125 Per Cent In One Year: Greenpeace India Study

IIT Delhi research scholar Hardeep Singh, who carried out detailed experiments to develop these fabrics, said the porous materials such as activated carbon, zeolites, and Metal Organic Frameworks (MOFs) are capable of adsorbing VOCs from air.

The MOFs can be tweaked to create textiles that have antimicrobial, biomedical, particulate matter filtering, fuel filtering, chemical warfare protecting and UV radiation absorbing properties. The ZIFs specifically are more suitable under Indian conditions, he said.

Also Read: 10-Unit Rise In PM2.5 Causes 7 Hospital Admissions With Respiratory Disease A Week In Delhi: Study

(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)

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World

24,24,98,327Cases
20,40,54,102Active
3,35,14,449Recovered
49,29,776Deaths
Coronavirus has spread to 195 countries. The total confirmed cases worldwide are 24,24,98,327 and 49,29,776 have died; 20,40,54,102 are active cases and 3,35,14,449 have recovered as on October 22, 2021 at 5:24 am.

India

3,41,43,236 15,786Cases
1,75,7453,086Active
3,35,14,449 18,641Recovered
4,53,042 231Deaths
In India, there are 3,41,43,236 confirmed cases including 4,53,042 deaths. The number of active cases is 1,75,745 and 3,35,14,449 have recovered as on October 22, 2021 at 2:30 am.

State Details

State Cases Active Recovered Deaths
Maharashtra

65,98,218 1,573

27,899 1,434

64,30,394 2,968

1,39,925 39

Kerala

48,88,523 8,733

82,093 1,240

47,79,228 9,855

27,202 118

Karnataka

29,84,849 365

9,017 86

29,37,848 443

37,984 8

Tamil Nadu

26,91,797 1,164

13,790 268

26,42,039 1,412

35,968 20

Andhra Pradesh

20,62,303 493

5,500 66

20,42,476 552

14,327 7

Uttar Pradesh

17,10,068 10

107 5

16,87,062 14

22,899 1

West Bengal

15,83,646 833

7,535 44

15,57,090 775

19,021 14

Delhi

14,39,488 22

311 1

14,14,087 21

25,090

Odisha

10,37,056 524

4,336 51

10,24,422 573

8,298 2

Chhattisgarh

10,05,773 38

206 21

9,91,995 16

13,572 1

Rajasthan

9,54,395 2

36 2

9,45,405 4

8,954

Gujarat

8,26,353 13

156 20

8,16,110 33

10,087

Madhya Pradesh

7,92,721 12

88 6

7,82,110 6

10,523

Haryana

7,71,125 9

131 2

7,60,945 11

10,049

Bihar

7,26,042 6

30 0

7,16,351 6

9,661

Telangana

6,69,739 183

3,967 1

6,61,829 183

3,943 1

Assam

6,07,811 384

3,762 152

5,98,087 228

5,962 4

Punjab

6,02,135 22

226 6

5,85,358 27

16,551 1

Jharkhand

3,48,526 40

166 24

3,43,225 16

5,135

Uttarakhand

3,43,787 14

176 0

3,36,213 14

7,398

Jammu And Kashmir

3,31,386 87

814 14

3,26,143 73

4,429

Himachal Pradesh

2,22,138 202

1,452 58

2,16,955 140

3,731 4

Goa

1,77,765 59

618 21

1,73,790 35

3,357 3

Puducherry

1,27,564 43

454 7

1,25,258 50

1,852

Manipur

1,23,051 81

1,346 14

1,19,800 94

1,905 1

Mizoram

1,15,944 737

10,034 229

1,05,510 962

400 4

Tripura

84,369 18

105 10

83,448 8

816

Meghalaya

83,210 52

735 26

81,034 76

1,441 2

Chandigarh

65,315 3

26 2

64,469 1

820

Arunachal Pradesh

55,065 22

140 2

54,645 20

280

Sikkim

31,819 19

185 10

31,241 9

393

Nagaland

31,670 11

250 5

30,743 15

677 1

Ladakh

20,896 10

43 9

20,645 1

208

Dadra And Nagar Haveli

10,678 2

4 2

10,670

4

Lakshadweep

10,365

0 0

10,314

51

Andaman And Nicobar Islands

7,646

7 0

7,510

129

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