Article
Geosciences, Multidisciplinary
Bing Bai, Fan Bai, Chenmiao Sun, Qingke Nie, Shuo Sun
Summary: This study discusses the adsorption capacity of oyster shell powders (SPs) and the adsorption mechanism of heavy metal ions (HMs; i.e., cadmium ions Cd2+ and lead ions Pb2+) on SPs through adsorption kinetics tests, adsorption-desorption tests, scanning electron microscopy, and Fourier transform infrared spectroscopy. The effects of seepage velocity, heavy metal types, and SP addition amount/concentration on the adsorption performance of SPs in treating HMs in laterite and quartz sand were analyzed. The research findings indicate that SPs have high purification efficiency for HMs in contaminated soils.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Shiyu Xie, Jing Hu, Ke Li, Yaxin Zhao, Na Ma, Yaomin Wang, Yujuan Jin, Gaiping Guo, Rakesh Kumar, Jian Li, Jin Huang, Huafeng Tian
Summary: The combination of zein, collagen, and polyvinyl alcohol (PVA) in nanofibers showed promising adsorption properties for Cu2+ ions. Collagen nanofibers exhibited superior adsorption performance compared to zein nanofibers. The optimal adsorption was achieved at 50% protein content.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Materials Science, Multidisciplinary
Wenli Li, Qiongyuan Zhang, Jie Zhang, Yuhua Zheng, Hao Zhang, Jiao Liu, Yanbin Cui
Summary: The study proposed hydrophobic modification and regeneration of waste AC to enhance its adsorption capacity for organic compounds by increasing surface roughness, introducing SiO2 particles, grafting nonpolar alkyl chain groups, and using high-temperature regeneration. The experimental results showed improved hydrophobicity and specific surface area of the modified AC, indicating the method's significance for the recovery and utilization of waste AC.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Applied
Siyan Liu, Lihua Liu, Gang Su, Lu Zhao, Hongliang Peng, Jianrong Xue, Anping Tang
Summary: In this study, a novel magnetic core-shell chelating adsorbent was fabricated and demonstrated to have high adsorption capacity for heavy metal ions. The adsorbent showed excellent separation, recovery, and recyclability properties.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Engineering, Chemical
Jin-Wei Zhang, Sarah Mariska, Sabolc Pap, Hai Nguyen Tran, Huan-Ping Chao
Summary: Oxygen-containing groups on material surfaces are essential for the adsorption of toxic metals. Acrylic acid and ammonium cerium nitrate are used to enhance the density of these groups in carbonaceous materials. Hydrochar, biochar, and activated carbon derived from ginger residues serve as feedstock for the grafting process. The grafted materials show higher oxygen content and increased adsorption capacity for metal ions compared to ungrafted materials. The primary adsorption mechanisms are complexation and ion exchange.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Anh Tuan Hoang, Sunil Kumar, Eric Lichtfouse, Chin Kui Cheng, Rajender S. Varma, N. Senthilkumar, Phuoc Quy Phong Nguyen, Xuan Phuong Nguyen
Summary: This review provides an update on utilizing biomass waste-derived activated carbon for adsorbing common pollutants like Cr, Pb, Cu, Cd, Hg, and As, with a focus on different mechanisms of heavy metal adsorption and key parameters affecting adsorption performance. The use of microwave technique for activation is gaining popularity due to its ability to ensure uniform energy distribution and enhance surface area, although chemical activation remains preferred for its ease of operation, lower cost, and shorter preparation time.
Review
Multidisciplinary Sciences
Chenxi Zhao, Guangyang Liu, Qiyue Tan, Mingkun Gao, Ge Chen, Xiaodong Huang, Xiaomin Xu, Lingyun Li, Jing Wang, Yaowei Zhang, Donghui Xu
Summary: This review article summarizes the preparation methods of hydrogels using biopolymers as the main raw materials, discusses the main categories and applications of biopolymer hydrogels, and emphasizes their great potential in environmental remediation.
JOURNAL OF ADVANCED RESEARCH
(2023)
Article
Engineering, Environmental
Cuijuan Feng, Michael Huang, Chin-pao Huang
Summary: A gamma-Fe2O3-biochar was synthesized using ferrate as precursor, which increased surface acidity and magnetism strength, enhancing metal ion adsorption and enabling easy magnetic separation. The adsorption of selected metal ions onto gamma-Fe2O3-biochar was well fitted by the Langmuir adsorption model, with significantly high monolayer metal coverage capacity. Metal ion adsorption reactions involved surface complex formation and the dominating component for adsorption was specific chemical energy.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
G. Issabayeva, S. H. Wong, C. Y. Pang, M. C. Wong, M. K. Aroua
Summary: This study evaluated the adsorption of fluoride using two low-cost adsorbents: palm shell activated carbon and chitosan of prawn shells. The highest removal efficiencies of fluoride by the adsorbents were 46% and 55% at pH 2 and 7, respectively. The contrasting behavior of the two adsorbents in relation to pH is attributed to the surface charge associated with surface functional groups identified by FTIR. Adsorption kinetics results fitted well into the pseudo-second-order kinetics model, suggesting a chemisorption mechanism of fluoride removal.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Pu Liu, Tianpeng Song, Ruixue Deng, Xiaogai Hou, Junpeng Yi
Summary: Preparation of high-performance activated carbon from agroforestry waste biomass effectively improves the performance of traditional biomass carbon. In this study, activated carbon was prepared using waste biomass peony seeds shell and used to remove pollutants in water. The activated carbon exhibited excellent adsorption capacity and potential application as a wastewater purification adsorbent.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Hu Zhu, Lu Li, Wendan Chen, Yuejin Tong, Xuesong Wang
Summary: A coral-like hierarchical porous magnesium hydroxide (HPMH) with controllable nanostructure, surface area, and pore volume was successfully prepared using a simple one-step hydrothermal process. The addition of citric acid (CA) played a key role in regulating the pore structure of the HPMH products. The HPMH showed high adsorption capabilities for Pb(II) and Cd(II) ions, following a Pseudo-second-order and Langmuir adsorption mechanism, suggesting a monolayer chemical adsorption process for heavy metal ions.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Construction & Building Technology
Chunhua Xia, Xueying Zhang, Linghui Xia
Summary: The study found that POSB has a good adsorption effect on heavy metal ions in water, especially Ni(II), Zn(II), and Mn(II). The control of OS content, adsorption time, and water pH values is important in the manufacturing process of POSB.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Qian Wang, Bing Wang, Yuena Ma, Xueyang Zhang, Wenqiang Lyu, Miao Chen
Summary: Heavy metals pollution in mining soils poses a serious threat to the ecological environment and human health worldwide. Phytoremediation and pyrolysis have been shown to be effective methods for stabilizing heavy metals in plants, reducing their toxicity to the environment and human body. Additionally, biochars produced from post-phytoremediation plant residues demonstrate excellent adsorption capacities for heavy metals.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Baoying Wang, Jingming Lan, Junli Pu, Xiu Liu, Bonglin Gong
Summary: This study focused on the treatment of waste water containing cadmium ions using modified activated carbon. The modified AC showed a much higher adsorption capacity for Cd2+ compared to unmodified AC. The adsorption kinetics followed pseudo-second-order kinetics, and the isotherms followed the Langmuir equation, indicating the potential of the modified AC in treating Cd2+ containing waste water from chemical plants during battery manufacturing.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Hong Ma, Yilin Yang, Fengyue Yin, Xiong-Fei Zhang, Jianhao Qiu, Jianfeng Yao
Summary: In this study, MIL-121 crystals were incorporated into a biodegradable alginate matrix to form composite beads, which showed enhanced recyclability and adsorption capacity. The optimal sample exhibited high adsorption capacities for Cu2+ and Cd2+. In addition, the composite beads could be effectively regenerated using hot water without the need for strong acids.
JOURNAL OF CLEANER PRODUCTION
(2022)