Article
Polymer Science
Amani Chrouda
Summary: In recent years, detecting heavy metal ions in food chains and water has become an urgent need due to the serious environmental and human health problems they pose. This study developed a new electrochemical sensor based on a sodium alginate biopolymer decorated with single-walled carbon nanotubes for trace level detection of heavy metal ions. Different brown algae were used to extract sodium alginate, with Cystoseira being the most common. The sensor showed good stability, high sensitivity, and appealing inter-electrode repeatability, making it a promising alternative for heavy metal ions detection.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Chemistry, Applied
Tianzhu Shi, Zhengfeng Xie, Zhu Zhu, Wei Shi, Yucheng Liu, Minyao Liu
Summary: A new potential adsorbent prepared using hydrazide modification showed good adsorption performance for the separation and removal of heavy metal ions, with high adsorption capacities and efficient removal of various heavy metal ions. The process exhibited endothermic and spontaneous characteristics, and the adsorbent maintained a certain adsorption efficiency even after multiple cycles.
CARBOHYDRATE POLYMERS
(2022)
Article
Polymer Science
Gohar Khachatryan, Karen Khachatryan, Joanna Szczepankowska, Marcel Krzan, Magdalena Krystyjan
Summary: The aim of this study was to design nanocomposites using a simple, low-cost and environmentally friendly synthesis method. Carbon nanostructures were used to reinforce the chitosan/alginate bond, improving the mechanical, solubility, water absorption, and UV radiation protection properties. SEM, FTIR, UV-VIS, and color analysis were used to determine the thickness and mechanical properties of the films. The tests showed uniform distribution of nanostructures and no chemical interactions between nanoparticles and polymers. Enrichment of the polysaccharide composite with graphene oxide and carbon nanotubes positively affected its absorption, mechanical capabilities, and color.
Article
Materials Science, Composites
Yanling Chen, Qin Yao, Sanyin Qu, Wei Shi, Hui Li, Lidong Chen
Summary: In this study, metal Phthalocyanine complex hybrids with single-walled carbon nanotubes were prepared and their thermoelectric properties were investigated. The electrical conductivity of the hybrids increased significantly with higher SWCNT content, surpassing values predicted by the mixture rule. NiPc/SWCNT hybrids exhibited the highest electrical conductivity, with the lowest interface energy barrier contributing to this enhancement.
COMPOSITES COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Heyu Sun, Jiang Zhan, Li Chen, Yiping Zhao
Summary: In this study, a hydrogel with chitosan/sodium alginate/calcium ion physical cross-linked double network structure was prepared using a semi-dissolution acidification sol-gel transition method. Hyperbranched polyamide-amine was introduced to improve the adsorption capacity of the hydrogel. Experimental results showed that the third-generation hyperbranched polyamide-amine hydrogel exhibited the best comprehensive performance, with high adsorption capacities for copper ions and cadmium ions.
APPLIED SURFACE SCIENCE
(2023)
Article
Environmental Sciences
Long Kong, Guizhen Yan, Xinxin Huang, Yanxin Wu, Xin Che, Jian Liu, Jianbo Jia, Hongyu Zhou, Bing Yan
Summary: The probability of occupational exposure to carbon nanotubes (CNTs) is increasing due to their growing production and biomedical applications. As a result, the risk of co-exposure of nanomaterials with environmental pollutants is also increasing. This study investigated the toxicity of pristine single-walled CNTs (p-SWCNTs) and oxidized single-walled CNTs (SWCNT-COOHs) on cell responses to metal ions (Pb2+, Cu2+, and Cr(VI)). The findings suggest that understanding the effects of the exposure sequence of engineered nanomaterials and environmental pollutants on their toxicity is crucial for evaluating combined toxicity.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Physical
Xiaoqiong Wu, Yutong Song, Ping Yin, Qiang Xu, Zhenglong Yang, Yanbin Xu, Xiguang Liu, Ying Wang, Wenjuan Sun, Honglan Cai
Summary: In this study, a novel composite material SEP@PEI/SA was successfully designed and fabricated for efficient removal of lead ions. The adsorption properties of SEP@PEI/SA for various heavy metal ions were investigated, and it was found to have a high adsorption capacity for lead ions. The adsorption process could be accurately described by a pseudo second-order rate equation and Langmuir isotherm model.
APPLIED CLAY SCIENCE
(2022)
Review
Biochemistry & Molecular Biology
Zetty Azalea Sutirman, Mohd Marsin Sanagi, Wan Ibrahim Wan Aini
Summary: Alginate, a cheap and naturally produced material, is considered as an alternative technology in the removal of heavy metal and radionuclides in water bodies. This review provides a critical discussion on the process variables, mechanisms, and future research needs for the improvement of adsorption performance and practical applications of alginate-based materials.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Materials Science, Paper & Wood
A. I. Abd-Elhamid, E. M. Abu Elgoud, H. F. Aly
Summary: In this study, a new strategy was developed to modify graphene oxide (GO) with sodium alginate (SA) for efficient adsorption of heavy metals. The prepared GO-SA composite exhibited high adsorption capacities for Pb2+, Zn2+, and Cd2+, and showed good regeneration and reuse ability.
Article
Engineering, Chemical
Wenbin Li, Mengting Guo, Yinfei Wang, Hongyan Deng, Hou Lei, Chutong Yu, Zhifeng Liu
Summary: Highly efficient remediation materials were developed using semi-carbonized plant fiber and chemical fiber as research materials. The materials were modified and their adsorption capacity for heavy metal ions was studied. The results showed that the modified fibers had higher adsorption capacity, with optimal conditions of 30 degrees Celsius, pH 6, and ionic strength of 0.1 mol/L. The forms of adsorption for heavy metal ions were found to be electrostatic adsorption, precipitation, complexation, and ion exchange.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Materials Science, Multidisciplinary
Sisi Wu, Juan Guo, Ying Wang, Chao Huang, Yong Hu
Summary: A novel magnetic polysaccharide composite hydrogel was successfully synthesized for removal of heavy metal ions from aqueous solution. The maximum adsorption capacities for Mn(II), Pb(II), and Cu(II) were found to be 71.83, 89.49, and 105.93 mg/g, respectively, with ion exchange and chemical adsorption being the main adsorption mechanisms. The magnetic hydrogel showed high efficiency even after four cycles, indicating its great potential for practical applications in heavy metal ion removal.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Analytical
Yujie Shen, Mingcong Rong, Xiaodan Qu, Bolin Zhao, Jinhui Zou, Zhenbang Liu, Yu Bao, Ying He, Siyi Li, Xiaojin Wang, Meiyun Chen, Kaiying Chen, Yuwei Zhang, Li Niu
Summary: Detection of heavy metal ions in water is an important topic in the field of analytical chemistry and environmental science. In this study, a novel strategy for determining the total content of heavy metal ions in water using fluorescence spectroscopy was developed. Fluorescent nitrogen, sulfur co-doped carbon quantum dots were prepared and showed a wide linear response to a series of water-soluble metal ions. The N, S-CQDs were also found to effectively remove heavy metal ions from water.
Article
Chemistry, Inorganic & Nuclear
Xue Zhao, Xiyan Liu, Feng Yang, Qidong Liu, Zeyao Zhang, Yan Li
Summary: By using graphene oxide as a support, well-dispersed CoWO4 nanoparticles were prepared to facilitate the controlled growth of single-walled carbon nanotubes. CoWO4 proved to be a superior catalyst precursor for obtaining nanoparticles with a well-controlled size, while graphene oxide acted as a feasible substrate to ensure the uniform formation and dispersibility of nanoparticles in aqueous solution. This strategy may have broad applications in the preparation of various functional nanomaterials.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Physical
Tianzhu Shi, Zhengfeng Xie, Xinliang Mo, Wei Shi, Haiyan Qiu, Guihong Lan, Yucheng Liu
Summary: In this study, hydrazone-modified sodium alginate was prepared by aldimine condensation and showed highly effective and selective removal of Pb2+, Cd2+, and Cu2+. The adsorption process was mainly chemisorption, with the maximum adsorption capacities for Pb2+, Cd2+, and Cu2+ being 668.42, 472.37, and 200.10 mg g-1, respectively. The study also revealed the coordination interaction and ion exchange between heavy metal ions and nitrogen and oxygen atoms in hydrazone groups. Furthermore, the adsorption efficiency was not significantly reduced after 10 adsorption-desorption cycles.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Review
Energy & Fuels
Jin-Myung Choi, Jiye Han, Tushar Rane, Soyeon Kim, Ick Soo Kim, Il Jeon
Summary: This review discusses the fundamentals of utilizing SWCNTs in PSCs, including their characteristics as electron-transporting layer, hole-transporting layer, photoactive layer, and interfacial materials. It also presents strategies to improve PSCs performance through defect control and enhancement of electrical and morphological properties.
JOURNAL OF PHYSICS-ENERGY
(2022)
Article
Engineering, Chemical
Dafu Wang, Wei Wei, Yun Hang Hu
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2020)
Article
Chemistry, Multidisciplinary
Dafu Wang, Julius D. Stuart, Alec A. Jones, Christopher D. Snow, Matt J. Kipper
Summary: This study quantitatively measured the interactions of DNA strands with porous protein crystals using high-resolution atomic force microscopy, revealing the surface structure of protein crystals with unusually large pores and strong interactions between DNA and the porous protein crystals.
