Article
Materials Science, Multidisciplinary
Dan Luo, Shao-zhong Hu, Ting Huang, Nan Zhang, Yan-zhou Lei, Yong Wang
Summary: This paper presents the development of an efficient, economical, and environmentally friendly monolithic adsorbent for the removal of toxic hexavalent chromium. The study successfully prepared cellulose acetate and polyethylenimine blended porous fiber membranes with high porosity using electrospinning. The adsorption behavior and eliminating mechanism of the membranes towards Cr(VI) were comprehensively explored. The maximum adsorption capacity was higher than most biomass-based adsorbents, and the membrane effectively reduced the concentration of Cr(VI) to a level much lower than the drinking water standard.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Energy & Fuels
Zahraa S. Taha, Ahmed Labena, Hekmat R. Madian, Hala S. Ahmed, H. M. Hassan
Summary: Jatropha curcas seedcakes were utilized for bioethanol production and removal of methylene blue dye and hexavalent chromium from contaminated wastewater. Results showed that seedcakes from sewage water and sewage water with sludge irrigation produced the highest ethanol yield, while seedcakes from sewage water irrigation had the highest removal efficiencies for methylene blue and hexavalent chromium. The optimal parameters for removal efficiency were determined for both pollutants using Jatropha curcas seedcakes.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Environmental Sciences
Xiaoyan Liu, Shenyu Zhang, Xinying Zhang, Hao Guo, Xinde Cao, Ziyang Lou, Wei Zhang, Chuanhua Wang
Summary: A novel hydrogel-supported nanoscale zero-valent iron (nZVI) composite, synthesized by ion exchange and in-situ reduction, showed enhanced removal efficiency for Cr(VI) compared to pure nZVI. The composite exhibited high removal capacity under acidic conditions, attributed to chemical reduction/precipitation, surface sorption, and swelling uptake mechanisms. The lignin hydrogel acted as a carrier, preventing aggregation of nZVI particles and improving their reactivity and utilization.
Article
Materials Science, Multidisciplinary
Uttam Kumar Sahu, Ying Zhang, Wei Huang, Hui Ma, Sandip Mandal, Sumanta Sahu, Manoj Kumar Sahu, Raj Kishore Patel, Shengyan Pu
Summary: In this study, a tea waste/CeO2 bio-composite was synthesized and evaluated for the remediation of Cr(VI) in contaminated water. The bio-composite demonstrated high removal efficiency, with 96% of Cr(VI) being removed under optimized conditions. The material also showed good reusability, with 85% removal efficiency in the fourth consecutive cycle.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Yue Zhang, Yayuan Mo, Thierry Vincent, Catherine Faur, Eric Guibal
Summary: In this study, APEI beads were quaternized to enhance the sorption of Cr(VI), with optimal pH of 2 for both sorption and reduction. The reduction-assisted sorption mechanism boosts the global removal of chromate, while the sorbent's stability for Cr(VI) removal was confirmed through three successive sorption and desorption cycles. The interactions between the sorbent and Cr(VI) were further elucidated using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS).
Article
Environmental Sciences
He Peng, Ke Liang, Huanyan Luo, Huayan Huang, Shihua Luo, AKang Zhang, Heng Xu, Fei Xu
Summary: This study successfully established a system using newly screened chromium-reducing strains in conjunction with hyperaccumulator plants for the remediation of Cr-contaminated soil. The system not only increased soil enzyme activities, decreased toxic substances in plant leaves significantly, but also enhanced plant uptake of Cr.
Article
Engineering, Chemical
Sheng Cao, Shao-zhong Hu, Dan Luo, Ting Huang, Nan Zhang, Yan-zhou Lei, Yong Wang
Summary: The study successfully coated polydopamine (PDA) nanoparticles onto the smooth surface of a melamine foam (MF) skeleton through a bio-inspired functionalization method, resulting in changes in surface roughness and chemical features. The PDA-coated MF (MF-PDA) showed good removal ability, high adsorption selectivity, and high desorption ability towards highly toxic Cr(VI), making it a promising adsorbent for removing this toxic metal ion from wastewater. Additionally, the coated PDA had a strong reduction effect on Cr(VI), converting a significant portion of toxic Cr(VI) into lower-toxic Cr(III) during adsorption.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Polymer Science
Anzu Nishino, Ayane Taki, Hiromichi Asamoto, Hiroaki Minamisawa, Kazunori Yamada
Summary: The adsorption properties of hexavalent chromium ions onto porous silica beads were enhanced through functionalization with alkylamine chains or polyfunctional amine compounds. The presence of amino groups on the silica beads was confirmed, and increasing the concentration of alkylamine or reaction time increased the amount of amino groups. The adsorption capacity was highest at pH 3.0 and increased with temperature. The adsorption behavior followed a pseudo-second order kinetic model and adhered to the Langmuir isotherm. Treating the silica beads with additional compounds further increased the adsorption capacity.
Review
Engineering, Environmental
Rekah Nadarajah, Md. Sohrab Hossain, Md Bazlul Mobin Siddique, Md. Azharul Arafath, Mu. Naushad, Jun Wei Lim, Adel Al-Gheethi, Harlina Ahmad
Summary: This study reviews the contamination of hexavalent chromium (Cr(vi)) in the aquatic ecosystem and the application of magnetic bio-adsorbents for the adsorptive elimination of Cr(vi) from industrial effluent. The results show that magnetic adsorbents can be potential adsorbents for the elimination of Cr(vi) from wastewater and industrial effluents. These findings can be applied to determine active bio-sorbents for the elimination of Cr(vi) from industrial effluent.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Elliott M. Hamilton, Scott D. Young, Elizabeth H. Bailey, Olivier S. Humphrey, Michael J. Watts
Summary: Microdialysis coupled with high-performance liquid chromatography-inductively coupled plasma mass spectrometry (HPLC-ICP-MS) allows for continuous sampling and simultaneous detection of Cr-VI in soil solution, offering improved temporal resolution and a significant reduction in analysis time.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Chemical
Thanh Ngoc-Dan Cao, Shiao-Shing Chen, Hau-Ming Chang, Saikat Sinha Ray, Faisal I. Hai, Thanh Xuan Bui, Hussnain Mukhtar
Summary: For the first time, an osmotic microbial fuel cell (OsMFC) was used to simultaneously remove hexavalent chromium [Cr(VI)], organic pollutants, produce energy, and recycle water. The optimal catholyte concentration for Cr(VI) reduction was found to be 0.2 M NaCl, which exhibited high removal efficiency due to the thermodynamically favored low pH conditions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Agricultural Engineering
Jingjing Chu, Huazhong Ma, Lili Zhang, Zhiguo Wang
Summary: Paper-based catalytic composite films were prepared by synthesizing nanolignin on a filter paper and reducing Pd ions to Pd nanoparticles. Two different routes were used to prepare alkaline lignin NPs, with LAL NPs having a broader size range compared to RAL NPs. The AL NPs on FP acted as a reducing agent for the reduction of Pd2+ and were efficient in catalyzing the reduction of Cr6+ to less toxic Cr3+. The presence of FP influenced the dispersity and uniformity of the NPs, affecting the content of Pd NPs and the efficiency of Cr6+ reduction.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Chemistry, Multidisciplinary
Xuying Guo, Zhiyong Hu, Xinle Gao, Yanrong Dong, Saiou Fu
Summary: In this study, fly ash-loaded nano-FeS composites were found to have good performance in the removal of Cr(VI) and total chromium, providing a possible solution for effective elimination of these toxic heavy metals.
Article
Environmental Sciences
Amrita Jasu, Bandia Dutta, Samir Chandra Das, Rina Rani Ray
Summary: The strain Serratia marcescens AJRR-22 isolated from an iron mine showed the ability to reduce hexavalent chromium, a major pollutant in soil and water. By applying this strain, the level of hexavalent chromium in textile washout-enriched agricultural soil and tannery effluent was significantly reduced, leading to enhanced growth and germination of plants in contaminated agricultural fields.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Engineering, Environmental
Cesar Mario Laureano-Anzaldo, Martin Esteban Gonzalez-Lopez, Aida Alejandra Perez-Fonseca, Luis Emilio Cruz-Barba, Jorge Ramon Robledo-Ortiz
Summary: This study demonstrates the enhancement of Cr(VI) uptake performance by supporting chitosan on a porous composite using APTES as a silanizing agent through a simple and green method. Batch and fixed-bed column adsorption experiments show high adsorption capacity and fast equilibrium rate of the silanized composite. In column regeneration, utilizing an alternative desorbing configuration minimizes the eluted volume and improves the behavior of the adsorbent in multiple cycles.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Applied
Jinseok Park, Jeongmin Nam, Haesung Yun, Hyoung-Joon Jin, Hyo Won Kwak
Summary: In this study, a water-stable and mechanically robust fish-derived gelatin (FG) film was successfully prepared using alginate dialdehyde (ADA) as a crosslinking agent. The mechanical strength and Young's modulus of the FG/ADA composite film significantly increased with an increase in the content of ADA, with FG/ADA10 film showing stability under wet conditions. The crosslinking process with ADA not only improved the mechanical properties but also enhanced the antioxidative capacity of the FG/ADA edible film, suggesting potential practical applications in the edible film-based packaging industry.
CARBOHYDRATE POLYMERS
(2021)
Article
Chemistry, Physical
Sun Jong Kim, Hyo Won Kwak, Sangwoo Kwon, Hyunho Jang, Su-il Park
Summary: Blend of PLA and PBSeT with the addition of HDI can improve the mechanical properties and hydrolysis resistance, with HDI-treated specimens exhibiting higher tensile strengths and elongations than the control group.
Article
Chemistry, Multidisciplinary
June-Ho Choi, Seong-Min Cho, Jong-Chan Kim, Sang-Woo Park, Young-Min Cho, Bonwook Koo, Hyo Won Kwak, In-Gyu Choi
Summary: The study found that extraction conditions significantly impact the structural characteristics of ethanol organosolv lignin, with different structural features exhibiting varying effects on thermal properties. Lignins with low molecular weight and high phenolic hydroxyl content showed excellent thermal properties.
Article
Multidisciplinary Sciences
Sung-Wook Hwang, Un Taek Hwang, Kyeyoung Jo, Taekyeong Lee, Jinseok Park, Jong-Chan Kim, Hyo Won Kwak, In-Gyu Choi, Hwanmyeong Yeo
Summary: This study established prediction models for the non-destructive evaluation of lignin-derived hydrochars' carbonization characteristics using near-infrared spectra, accurately predicting carbon content, oxygen/carbon, and hydrogen/carbon ratios with high coefficients of determination and low root mean square errors. The models showed better prediction performance compared to ordinary least squares regression models.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Applied
YunJin Kim, Junsik Bang, Jungkyu Kim, June-Ho Choi, Sung-Wook Hwang, Hwanmyeong Yeo, In-Gyu Choi, Hyoung-Joon Jin, Hyo Won Kwak
Summary: Nanocellulose is gaining interest as an eco-friendly water treatment material due to its large specific surface area and abundant hydroxyl functional groups, but its dispersion state hampers practical usage. A regenerated cellulose hydrogel with cationic functional groups was developed to address the low performance of nanocellulose in removing anionic pollutants. The PEI surface cationization process improved mechanical rigidity and showed excellent Cr(VI) removal capacity, maintaining high efficiency after multiple reuses.
CARBOHYDRATE POLYMERS
(2022)
Article
Polymer Science
Munju Shin, Sejun Yang, Hyo Won Kwak, Ki Hoon Lee
Summary: Various natural materials, including silk sericin (SS), have been used for the synthesis of gold nanoparticles (AuNPs). In this study, AuNPs were successfully synthesized using SS, and optimal synthesis conditions were determined. The size of the AuNPs prepared under the optimal conditions was approximately 17 nm, and the particles were well dispersed.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Subin Oh, Jungkyu Kim, YunJin Kim, Subong Park, Hyoung-Joon Jin, Hyo Won Kwak
Summary: In this study, a hydrogel-type high-performance Cr(VI) adsorbent was prepared using silk sericin (SS) and polyethyleneimine (PEI), with excellent removal capacity and adsorption efficiency after multiple cycles.
MACROMOLECULAR RESEARCH
(2021)
Article
Polymer Science
Jeongmin Nam, Hyo Won Kwak, Hyoung-Joon Jin
Summary: In this study, alkylated graphene oxide (AGO) and dialdehyde cellulose nanocrystal (DCNC) were incorporated into PVA composite barrier films to improve their moisture barrier properties. The addition of AGO and DCNC resulted in a 90% decrease in oxygen transmission rate and a 15% decrease in water vapor transmission rate compared to PVA barrier films.
Article
Chemistry, Applied
Jungkyu Kim, Junsik Bang, YunJin Kim, Jong-Chan Kim, Sung-Wook Hwang, Hwanmyeong Yeo, In-Gyu Choi, Hyo Won Kwak
Summary: In this study, a facile and simple nanocellulose drying system was designed using lignin as an eco-friendly additive to overcome the agglomeration issue during the drying process. The addition of lignin minimized aggregation and ensured excellent redispersion kinetics and stability, with the added lignin being removable through a simple washing process.
CARBOHYDRATE POLYMERS
(2022)
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
Materials Science, Multidisciplinary
YunJin Kim, Jinseok Park, Junsik Bang, Jungkyu Kim, Jong-Hwa Kim, Sung-Wook Hwang, Hwanmyeong Yeo, In-Gyu Choi, Hyo Won Kwak
Summary: The study explored the potential of lignin as an adsorption material for water restoration and dye removal. By crosslinking lignin fibers and utilizing a natural crosslinking agent, the lignin/PVA fibers exhibited excellent dye removal capacities. The desorption process was most efficient under low pH conditions, and the fibers maintained a 95% adsorption efficiency after five regeneration cycles.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Multidisciplinary Sciences
Jungkyu Kim, Subong Park, Junsik Bang, Hyoung-Joon Jin, Hyo Won Kwak
Summary: The development and utilization of biodegradable plastics is an effective solution to environmental pollution caused by non-degradable plastics. A biodegradable polymer called PBEAS, which has excellent strength and elongation, has been developed to replace non-degradable fishing nets. This eco-friendly fishing gear can prevent ghost fishing and potential microplastic leakage by collecting and composting the products after use.
Article
Polymer Science
Jungkyu Kim, Sangwoo Park, Seungoh Jung, Heecheol Yun, Kyusuk Choi, Gyeom Heo, Hyoung-Joon Jin, Subong Park, Hyo Won Kwak
Summary: This study evaluates the biodegradability of PBS fishing gear in marine sedimentary environments, aiming to address the issue of ghost fishing caused by discarded gear. Through biodegradation analysis, it is found that after 180 days, the PBS gear reduces to carbon dioxide by 27.3%. The remaining PBS shows bulk erosion and no changes in crystallinity and thermal properties. The degradation primarily occurs through surface abrasion and metabolic utilization of hydrolysis products by microorganisms.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Materials Science, Multidisciplinary
Subin Oh, Junsik Bang, Hyoung-Joon Jin, Hyo Won Kwak
Summary: Currently, the majority of oil-water separation membranes are made of fluorine-based polymers with low surface energy. However, these materials are non-biodegradable and require a large amount of organic and toxic solvents in the manufacturing process. Therefore, there is increasing interest in developing a new eco-friendly oil-water separation membrane that does not cause secondary pollution and exhibits selective wettability characteristics.
ADVANCED FIBER MATERIALS
(2023)
