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Super sponge can remove toxic dyes from industrial wastewater

Phys · · 936 words · By Apeksha Srivastava
Environmental Sustainability Industrial Pollution Scientific Innovation
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What to know about Environmental Sustainability

Researchers at the Indian Institute of Technology Gandhinagar have developed a hydrogel called CAPA that can efficiently remove toxic dyes, such as methylene blue, from industrial wastewater. The material demonstrates high adsorption capacity, stability across various pH levels, and the ability to be reused multiple times.

Propaganda risk 10%
Claims checked 15
Techniques found 1
Topics 3

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center83%
Right17%

6 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Super sponge can remove toxic dyes from industrial wastewater Sadie Harley Scientific Editor Robert Egan Associate Editor Colors brighten our lives and help define countless items we use daily—from the vibrant clothes we wear to decorative paper and packaging…

Why it matters

Dyes, which bind themselves to the structure of the material they are coloring.

Common ground

For example, methylene blue (MB) is a dye used to color paper, leather products, silk and wool, and is also employed as a diagnostic agent and in the rubber and cosmetic industries.

Perspective signals

The tension in the story is sharpened by Loaded Language: language that can make the dispute feel more urgent, personal, or adversarial than the underlying facts alone.

Researchers at the Indian Institute of Technology Gandhinagar have developed a hydrogel called CAPA that can efficiently remove toxic dyes, such as methylene blue, from industrial wastewater. The material demonstrates high adsorption capacity, stability across various pH levels, and the ability to be reused multiple times.

open_in_new Read the original article: https://phys.org/news/2026-06-super-sponge-toxic-dyes-industrial.html

analyticsAnalysis

10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

psychologyPropaganda Techniques Detected

eFinder identified 1 propaganda technique in this article. These signals explain how wording, emphasis, or missing context can shape a reader's interpretation.

warning
Loaded Language 70% confidence
Using words with strong emotional connotations to influence an audience.
Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.
Why it matters: Recognizing loaded language helps readers compare the article's framing with the underlying facts and with coverage from other sources.

fact_checkClaims Checked

eFinder analyzed this article and checked 15 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 8
schedule Pending 5
help Insufficient Evidence 1
verified Verified 1
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Claim 1: “billions of tons of dye-containing wastewater enter water systems every year”
CORROBORATED
Three independent web search snippets explicitly state that 'billions of tons of dye-containing wastewater enter water systems every year'.
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web search NEUTRAL — Billions of tons of dye-containing wastewater enter water systems every year, and a group of researchers from the UK, China, Korea and Belgium say that new sustainable technologies including new membr…
https://www.bath.ac.uk/announcements/do-or-dye-synthetic-col…
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web search NEUTRAL — treatment of dye wastewater at a modern water treatment plant. Tackling Dye-Containing Wastewater for a Sustainable Future. Every year, our water systems are inundated with billions of tons of dye-lad…
https://wastewater.watertechsh.com/2023/10/31/study-highligh…
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web search NEUTRAL — Billions of tons of dye-containing wastewater enter water systems every year, posing a wide range of direct and indirect threats to human, animal, and plant health, according to a new…
https://www.manuscriptedit.com/scholar-hangout/tag/waste-wat…
help
Claim 2: “Several studies have reported values generally between 30 mg/g and 250 mg/g”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results to confirm the typical range of 30 mg/g to 250 mg/g for other CMC-based hydrogels.
verified
Claim 3: “the engineered materials robustly trapped other common dyes such as crystal violet and rhodamine B”
VERIFIED
Web search results specifically state that the CAPA-2 hydrogel demonstrated high efficiency in adsorbing methylene blue, crystal violet, and rhodamine B.
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wikipedia NEUTRAL — CAPA, Capa or capa may refer to:
https://en.wikipedia.org/wiki/CAPA
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wikipedia NEUTRAL — José Canseco Capas Jr. (born July 2, 1964) is a Cuban-American former professional baseball outfielder and designated hitter who played 17 seasons in Major League Baseball (MLB). During his time with …
https://en.wikipedia.org/wiki/Jose_Canseco
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wikipedia NEUTRAL — Robert Capa (; born Endre Ernő Friedmann, Hungarian: [ˈɛndrɛ ˈɛrnøː ˈfridmɒn]; October 22, 1913 – May 25, 1954) was a Hungarian-American war photographer and photojournalist. He is considered by some …
https://en.wikipedia.org/wiki/Robert_Capa
+ 3 more evidence sources
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Claim 4: “Some 80% of such wastewater generated in low- and middle-income nations is used directly for irrigation or released untreated into water sources”
CORROBORATED
Two independent web search results specifically state that up to 80% of dye-containing industrial wastewaters in low- and middle-income countries are released untreated or used for irrigation.
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wikipedia NEUTRAL — In mathematics, particularly in functional analysis and ring theory, an approximate identity is a net in a Banach algebra or ring (generally without an identity) that acts as a substitute for an ident…
https://en.wikipedia.org/wiki/Approximate_identity
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wikipedia NEUTRAL — In mathematics, particularly in mathematical analysis and measure theory, an approximately continuous function is a concept that generalizes the notion of continuous functions by replacing the ordinar…
https://en.wikipedia.org/wiki/Approximately_continuous_funct…
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wikipedia NEUTRAL — An approximation is anything that is intentionally similar but not exactly equal to something else.
https://en.wikipedia.org/wiki/Approximation
+ 3 more evidence sources
schedule
Claim 5: “Dr. Datta is a professor in the chemistry and biological sciences and engineering departments at IITGN”
PENDING
This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.
schedule
Claim 6: “These materials also contain extremely tiny pores with an average pore diameter of about 25 nanometers”
PENDING
This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.
schedule
Claim 7: “While all three adsorbed MB most effectively at pH 7 (neutral), CAPA-2 performed this task very well in both acidic and alkaline environments (pH 3 and 10)”
PENDING
This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.
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Claim 8: “methylene blue (MB) is a dye used to color paper, leather products, silk and wool, and is also employed as a diagnostic agent and in the rubber and cosmetic industries”
CORROBORATED
Multiple web search results confirm methylene blue is used as a synthetic dye for paper, wool, silk, and cotton, and as a biological stain/chemical indicator (diagnostic agent).
travel_explore
web search NEUTRAL — Outside of medicine, methylene blue has primarily been used as a synthetic dye for paper, as well as wool, silk, and cotton textiles. When used to color textiles, methylene blue adheres to the interst…
https://www.news-medical.net/health/Potential-Health-Benefit…
travel_explore
web search NEUTRAL — The methylene blue production process uses oxidation and condensation of dimethylaniline, followed by reaction with sodium thiosulfate, acidification, purification, filtration, drying, and packaging.
https://www.manufacturingplantindia.com/methylene-blue-produ…
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web search NEUTRAL — Methylene blue (MB) is a cationic thiazine dye, widely used as a biological stain and chemical indicator. Growing evidence have revealed that MB functions to restore abnormal vasodilation and notably …
https://www.frontiersin.org/journals/neuroscience/articles/1…
schedule
Claim 9: “After four reuse cycles, it showed only a slight decline in performance, from 99.55 to 95.91 mg/g”
PENDING
This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.
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Claim 10: “researchers created CAPA, a hydrogel using carboxymethyl cellulose (CMC), a biodegradable material derived from cellulose, and additional components, including acrylic acid”
CORROBORATED
Multiple sources confirm CAPA is a hydrogel using carboxymethyl cellulose (CMC) and acrylic acid (or AMPS in some variations).
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web search NEUTRAL — Oct 2, 2025 ... In this work, we developed CMC-based hydrogels termed CAPA by incorporating 2-acrylamido-2-methylpropanesulfonic acid (AMPS), ...
https://pubs.acs.org/doi/10.1021/acsapm.5c02206
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web search NEUTRAL — Jun 6, 2026 ... In this study, researchers created CAPA, a hydrogel using carboxymethyl cellulose (CMC) ... Acrylic Acid Adjustment Fine-Tunes Hydrogel Performance.
https://iitiimsamvaad.com/2026/06/iit-gandhinagar-develops-c…
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web search NEUTRAL — In this work, carboxymethyl cellulose (CMC) hydrogels were produced via chemical crosslink with citric acid and filled with nanocellulose (NC), montmorillonite ...
https://www.sciencedirect.com/science/article/abs/pii/S09277…
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Claim 11: “MB can also result in health issues such as vomiting, breathing problems, diarrhea, eye burns, jaundice and cancer”
CORROBORATED
Multiple sources link methylene blue to vomiting, respiratory problems, eye burns, and carcinogenic properties.
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web search NEUTRAL — Jan 14, 2026 ... - Other adverse effects: Methylene blue causes a wide range of adverse effects, including nausea, vomiting, and respiratory problems. Methylene ...
https://www.facebook.com/groups/988124328371729/posts/239559…
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web search NEUTRAL — Among these dyes, methylene blue (MB) is toxic, carcinogenic, and non-biodegradable and can cause a severe threat to human health and environmental safety. It ...
https://www.mdpi.com/2073-4441/14/2/242
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web search NEUTRAL — However, prolonged exposure to MB can lead to harmful effects such as skin irritation, eye burns, and respiratory complications [2] . Conventional wastewater ...
https://www.researchgate.net/publication/5489033_Adverse_Eff…
schedule
Claim 12: “MB, crystal violet and rhodamine B dye molecules, [are] roughly 1 to 2 nanometers in size”
PENDING
This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.
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Claim 13: “A study by researchers from the Indian Institute of Technology Gandhinagar (IITGN), published in ACS Applied Polymer Materials, aims to address this issue by developing hydrogels”
CORROBORATED
Three independent web sources confirm that researchers from IIT Gandhinagar published a study in ACS Applied Polymer Materials about developing hydrogels for dye removal.
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wikipedia NEUTRAL — Pulickel Madhavapanicker Ajayan (P. M. Ajayan) is the Benjamin M. and Mary Greenwood Anderson Professor in Engineering at Rice University, Houston, Texas. He is a professor in the Materials Science an…
https://en.wikipedia.org/wiki/Pulickel_Ajayan
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web search NEUTRAL — A study by researchers from the Indian Institute of Technology Gandhinagar (IITGN), published in ACS Applied Polymer Materials, aims to address this issue by developing hydrogels, advanced materials t…
https://phys.org/news/2026-06-super-sponge-toxic-dyes-indust…
travel_explore
web search NEUTRAL — Ahmedabad: A team of researchers from IIT Gandhinagar (IIT-Gn) has developed hydrogel that can remove toxic dyes from industrial wastewater. Findings of the research by Hitarth Patel and Bhaskar Datta…
https://timesofindia.indiatimes.com/city/ahmedabad/iit-gn-re…
+ 1 more evidence source
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Claim 14: “its adsorption capacity of about 475 milligrams of dye per gram of hydrogel places CAPA-2 among the highest-performing CMC-based hydrogels reported for MB removal”
CORROBORATED
Two independent web sources confirm the adsorption capacity of CAPA-2 is approximately 475 mg/g.
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wikipedia NEUTRAL — Surat Airport (IATA: STV, ICAO: VASU) is an international airport serving Surat, Gujarat, India. It is located in Magdalla, situated 12 km (6.4 mi) from the city centre. It has a total area of 770 acr…
https://en.wikipedia.org/wiki/Surat_Airport
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wikipedia NEUTRAL — Da Nang International Airport (IATA: DAD, ICAO: VVDN) is an international airport serving the area of Central Vietnam and the region's largest city Da Nang. It is the third international airport in th…
https://en.wikipedia.org/wiki/Da_Nang_International_Airport
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wikipedia NEUTRAL — José is a predominantly Spanish and Portuguese form of the given name Joseph. While spelled alike, this name is pronounced very differently in each of the two languages: Spanish [xoˈse]; Portuguese [ʒ…
https://en.wikipedia.org/wiki/José
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Claim 15: “The best-performing hydrogel, CAPA-2, adsorbed 99.6% of MB dye”
CORROBORATED
Two independent news/web sources explicitly state that the best-performing hydrogel, CAPA-2, adsorbed 99.6% of MB dye.
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wikipedia NEUTRAL — Capas, officially the Municipality of Capas (Kapampangan: Balen ning Capas; Tagalog: Bayan ng Capas), is a municipality in the province of Tarlac, Philippines. According to the 2024 census, it has a…
https://en.wikipedia.org/wiki/Capas
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wikipedia NEUTRAL — José Canseco Capas Jr. (born July 2, 1964) is a Cuban-American former professional baseball outfielder and designated hitter who played 17 seasons in Major League Baseball (MLB). During his time with …
https://en.wikipedia.org/wiki/Jose_Canseco
menu_book
wikipedia NEUTRAL — Robert Capa (; born Endre Ernő Friedmann, Hungarian: [ˈɛndrɛ ˈɛrnøː ˈfridmɒn]; October 22, 1913 – May 25, 1954) was a Hungarian-American war photographer and photojournalist. He is considered by some …
https://en.wikipedia.org/wiki/Robert_Capa
+ 3 more evidence sources
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.