Article
Environmental Sciences
D. Prabu, P. Senthil Kumar, B. Senthil Rathi, S. Sathish, K. Vijai Anand, J. Aravind Kumar, Osama B. Mohammed, P. Silambarasan
Summary: This study established the potential of Fe3O4-BAC adsorbent by coating activated carbon with a nano adsorbent. The adsorbent exhibited superior magnetic behavior, high adsorption capacity, and removal efficiency under certain conditions.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Physical
Yanbo Pei, Menglin Li, Wei Li, Kai Su, Junmin Chen, Hongwei Yang, Daiyan Hu, Shengli Zhang
Summary: The cellulose-based composite adsorbent PEI-PAM-CF, featuring a double-network structure and blue fluorescence, demonstrated synergistic effects in removing low concentrations of Cr(VI) and exhibited good regeneration performance. The electrostatic adsorption mechanism between Cr(VI) and PEI-PAM-CF was revealed through reversible fluorescence phenomenon and DFT calculation, showing potential for treating Cr(VI)-containing wastewater at low concentrations.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Chemical
Natsuki Hayashi, Daiju Matsumura, Hiroyuki Hoshina, Yuji Ueki, Takuya Tsuji, Jinhua Chen, Noriaki Seko
Summary: This study proposed a method to reduce toxic hexavalent chromium to less harmful trivalent chromium using radiation-induced graft polymerization, and successfully synthesized solid adsorbents with good handling properties. The results showed that most of the hexavalent chromium was reduced to trivalent chromium relatively early during the adsorption process, followed by gradual changes in structure, requiring over a day to completely stabilize.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Vijay Kumar, Gaurav Rattan, Preeti Tewatia, Manpreet Kaur, Deepak Pathania, Sonal Singhal, Anupama Kaushik
Summary: Cellulose nanofibers (CNFs) derived from rice straw were used to develop effective fluorescent sensors for simultaneous detection of chromium Cr(VI) and mercury Hg(II) ions, addressing the problems of rice straw burning and heavy metal pollution. Modified CNFs with L-histidine (CHIS) exhibited significant fluorescence quenching in response to Cr(VI) and Hg(II) ions, with detection limits of 2.236 nM and 3.97 nM, respectively. XPS studies revealed strong interactions of CHIS with the metal ions, leading to fluorescence quenching. The sensor showed high selectivity, stability, and usability up to 4 cycles.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Multidisciplinary
P. E. Dim, L. S. Mustapha, M. Termtanun, J. O. Okafor
Summary: The study focused on using modified clay as adsorbents to remove heavy metals from industrial effluents, showing promising results in terms of adsorption efficiency and cost-effectiveness.
ARABIAN JOURNAL OF CHEMISTRY
(2021)
Article
Environmental Sciences
Linlin Hao, Dongmei Jia, Mengzhu Liu
Summary: A novel layer-by-layer adsorption method using pre-bleached sawdust cellulose coated with polyethylenimine (PSC-PEI) was proposed for the adsorption of Cu(II) and Cr(VI). The study found that PSC-PEI loaded with Cu(II) cations had a favorable effect on the adsorption of Cr(VI) anions. Kinetic regression analysis showed that PSC-PEI exhibited a stronger affinity towards Cr(VI) than Cu(II). The adsorption mechanism for Cu(II) involved the formation of copper-amine complex, while the adsorption mechanism for Cr(VI) mainly involved electrostatic attraction and redox reaction.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
James F. Amaku, Jude C. Nnaji, Segun A. Ogundare, Kovo G. Akpomie, Comfort M. Ngwu, Helen O. Chukwuemeka-Okorie, Siyaka Mj Zubairu, Boniface I. Ugwu, Stephen A. Odoemelam, Jeanet Conradie
Summary: In this research, a novel green tillite-based adsorbent (CMT) was synthesized by modifying the surface of natural/pristine tillite (PT) with Chrysophyllum albidum stem bark extract. CMT showed higher efficiency and adsorption capacity for Cr(VI) removal compared to most materials used for this purpose. The results also demonstrated the reusability of CMT and the chemisorption as the rate-controlling step. This study highlights the potential of Chrysophyllum albidum stem bark extract anchored on tillite as a green adsorbent for efficient Cr(VI) removal from polluted water.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Environmental Sciences
Qaiser Khan, Muhammad Zahoor, Syed Muhammad Salman, Muhammad Wahab, Muhammad Talha, Abdul Waheed Kamran
Summary: This study aimed to eliminate chromium from industrial effluents using chemically modified Pteris vittata plant leaves as an adsorbent. The modified leaves showed high uptake capacity for chromium and the adsorption process was exothermic and spontaneous.
Article
Materials Science, Multidisciplinary
Abhijit Behera, Sumanta Sahu, Souman Pahi, Satish Kumar Singh, Bikash Mahapatra, Raj Kishore Patel
Summary: In this study, a novel polypyrrole modified alpha-zirconium phosphate nanocomposite was synthesized and demonstrated its potential in removing hexavalent chromium.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
G. Sarojini, S. Venkatesh Babu, N. Rajamohan, P. Senthil Kumar, M. Rajasimman
Summary: This study investigated the sorption ability of PPy-Fe3O4-SW nano-composite for Cr(VI) removal under various operating parameters, and found that the composite effectively removed Cr(VI) under optimized conditions. The sorption mechanism was primarily identified as electrostatic interaction and ion-exchange.
ENVIRONMENTAL RESEARCH
(2021)
Article
Engineering, Environmental
YunJin Kim, Jinseok Park, Junsik Bang, Jungkyu Kim, Hyoung-Joon Jin, Hyo Won Kwak
Summary: Nanocellulose has promising applications in water treatment due to its unique properties, such as renewability and large surface area; a study showed that carboxymethyl cellulose nanofibrils modified with polyethyleneimine had excellent Cr(VI) removal capacity and stability; the removal of Cr(VI) was achieved through a combination of electrostatic attraction, chemical reduction, and chelation mechanisms.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Arvind Gupta, Camila Reyes Ladino, Tizazu H. Mekonnen
Summary: This study presents the development and utilization of a cellulose-based cationic adsorbent for the removal of anionic dyes from water, providing an efficient and environmentally friendly solution for dye removal from wastewater.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Polymer Science
Konstantin A. Milakin, Oumayma Taboubi, Jirina Hromadkova, Patrycja Bober
Summary: Polypyrrole-gelatin aerogels containing magnetic barium ferrite particles were synthesized and used for the removal of Cr(VI) from aqueous media. The optimal pH for adsorption was found to be 4, due to the dominance of HCrO4- species and its better adsorption and reduction compared to CrO42-. The presence of magnetic particles did not affect the adsorption performance of the aerogels. The adsorption mechanism involved electrostatic interaction between chromium and the adsorbent.
Article
Engineering, Chemical
Li Zhang, Jing Huang, Xuemei Liu, Simeng Luo, Lingxiao Qu
Summary: This study modified bagasse with phosphoric acid, nitric acid, and oxalic acid to obtain PMB, NMB, and OMB adsorbents for Cr(VI) adsorption in wastewater. An orthogonal test was conducted to investigate the effects of immersion ratio, immersion temperature, immersion time, and acid concentration on the adsorption performance. The results showed that the adsorbent had the highest adsorption efficiency under specific conditions. Characterization analysis revealed that the surface properties of PMB, NMB, and OMB differed from those of bagasse, and they exhibited better adsorption performance than the original bagasse. Langmuir adsorption isotherm and quasi-secondary kinetic equation confirmed the adsorption of Cr(VI) by PMB, NMB, and OMB. Overall, PMB, NMB, and OMB can effectively purify Cr(VI) wastewater.
DESALINATION AND WATER TREATMENT
(2022)
Article
Materials Science, Ceramics
Perumal Karthikeyan, Krishnapillai Ramkumar, Kalimuthu Pandi, Aqsa Fayyaz, Sankaran Meenakshi, Chang Min Park
Summary: This study successfully investigated the use of two-dimensional MXenes as an adsorbent for removing Cr(VI) and MO from water. The MXenes showed fast removal rates, good regeneration ability, and high adsorption efficiency, demonstrating its selectivity and feasibility as an effective adsorbent.
CERAMICS INTERNATIONAL
(2021)
