Article
Engineering, Multidisciplinary
Jie Zhu, Keiji Komatsu, Heng Li, Yuto Kudo, Rui Okuda, Yoshikuni Ishibashi, Takumi Yamada, Ikumi Toda, Shigeo Ohshio, Yoshinori Tuda, Hidetoshi Saitoh
Summary: A method for measuring the true density of nanoporous carbon (NPC) fabricated from rice husks based on a gas constant-volume expansion method was developed in this study. Results showed that this method provided accurate determination of true density with higher stability, particularly in NPC materials with higher specific surface area.
Article
Energy & Fuels
Hossein Beidaghy Dizaji, Thomas Zeng, Hieronymus Hoelzig, Jens Bauer, Gert Kloess, Dirk Enke
Summary: The study investigated ash transformation mechanisms in silica-rich biomass fuels, revealing the impact of impurities on the atomic structure of silica, leading to altered ash melting behavior and viscosity. Chemical water washing, acid leaching, and blending rice straw with rice husk were found to strongly influence the chemical composition of ashes and improve ash melting behavior.
Review
Chemistry, Analytical
Jitendra Kumar Sahoo, Amrutashree Hota, Chintan Singh, Supravarani Barik, Naini Sahu, Shraban Kumar Sahoo, Manoj Kumar Sahu, Harekrushna Sahoo
Summary: This review thoroughly investigated the use of rice husk and rice straw-based adsorbents for the removal of heavy metals and dyes contamination. The study highlighted the cost-effectiveness, easy availability, high adsorption efficiency, and reusability of these biowaste adsorbents. Various parameters affecting adsorption capability and the applicability of adsorption isotherm models and kinetic models were discussed in detail.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2021)
Review
Plant Sciences
Zheyong Li, Zhiwei Zheng, Hongcheng Li, Dong Xu, Xing Li, Luojing Xiang, Shuxin Tu
Summary: Rice husk biochar (RHB) is a low-cost and renewable resource that has shown high effectiveness in remediation of water and soil environments. Its properties can be modified through preparation process parameters and physical, chemical, and biological means. RHB performs poorly in solutions with coexisting metal, but can be modified for improved adsorption. It has been found effective in adsorbing heavy metals and organic matter, reducing pollutant availability, and enhancing crop growth in contaminated soils. However, further research is needed to understand its effectiveness in complex environments.
Article
Chemistry, Physical
Zhihong Wu, Xinyu Guo, Zhenzhen Meng, Cheng Yao, Yue Deng, Huafeng Zhou, Yubin Wang
Summary: This paper introduces the fabrication of a Ni/BHPC composite material with excellent absorption characteristics. By changing the concentration of NiSO4, the electromagnetic characteristics and absorption performance of the material are optimized. The research results show that incorporating Ni particles into BHPC enhances its wave absorption efficiency. This study contributes to the development of high-performance porous carbon microwave absorption materials from biomass.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Construction & Building Technology
Eduardo Cesar Pachla, Debora Bretas Silva, Kassio Joe Stein, Ederli Marangon, Wang Chong
Summary: This study aimed to improve the thermoacoustic performance of cellular concrete by adding rice straw to rice husk, reducing compressive strength but increasing three-point bending strength, and improving sound absorption. Wetting-and-drying cycles could enhance the compressive strength of specimens, while longer curing times also contributed to increased durability.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Anil Kumar Sakhiya, Virendra Kumar Vijay, Priyanka Kaushal
Summary: Heavy metal pollution in groundwater is a significant concern for human health in the Indo-Gangetic Plain of India. Rice straw burning is a major issue due to the lack of feasible utilization options. This study explores the production of biochar from rice straw and its potential for removing manganese and arsenic from water.
SURFACES AND INTERFACES
(2023)
Review
Water Resources
Hussein K. Okoro, Sikirat M. Alao, Sadanand Pandey, Ismaila Jimoh, Kazeem A. Basheeru, Zvinowanda Caliphs, Jane C. Ngila
Summary: Environmental contamination by heavy metals poses serious concerns as it negatively affects environmental health and biota. Rice husk, with its chemical stability and large surface area, is being widely used as an environmentally friendly adsorbent for heavy metal removal.
APPLIED WATER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Zhihong Wu, Zhenzhen Meng, Cheng Yao, Yue Deng, Guoli Zhang, Yubin Wang
Summary: In this study, porous carbon derived from rice husk was prepared for absorbing electromagnetic waves, showing excellent absorption properties with the adjustment and optimization of the pore structure achievable by controlling the heat treatment temperature. The porous carbon material demonstrates good impedance matching, high dielectric-loss capacity, large specific surface area, and reasonable pore diameter distribution, making it a promising lightweight and efficient electromagnetic absorbing material.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Xinyuan Zhang, Zixiang Gao, Xiaoping Fan, Li Tan, Yishun Jiang, Wanning Zheng, Fengxiang X. Han, Yongchao Liang
Summary: Hydrochars and biochars prepared from rice husk and Zizania latifolia straw were used as absorbents to remove toxic ions from Cd and/or Pb solutions. Biochars showed better adsorption capacities for Cd and Pb in single and competitive solutions compared to hydrochars. Zizania latifolia straw biochar had the highest adsorption capacity. The adsorption mechanisms involved monolayer adsorption, precipitation, complexation, and coordination with pi electrons.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Energy & Fuels
Eisa Khoshnood Motlagh, Neda Asasian-Kolur, Seyedmehdi Sharifian
Summary: This study compared the production of activated carbon and nanosilica from rice husk and rice straw, and found no significant difference in their functional groups and chemical characteristics. However, rice husk showed a higher silica production yield compared to rice straw.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Environmental Sciences
A. K. Priya, V Yogeshwaran, Saravanan Rajendran, Tuan K. A. Hoang, Matias Soto-Moscoso, Ayman A. Ghfar, Chinna Bathula
Summary: This study investigated the potential use of rice husk powder as a biosorbent for the removal of heavy metal ions from aqueous solutions. The experimental results showed that under optimized conditions, rice husk powder could effectively remove Cr, Pb, and Zn metal ions with high efficiency. The adsorption process followed the Temkin and D-R isotherm model and Elovich model for kinetic data. Based on the findings, rice husk powder could be considered as a low-cost and efficient adsorbent for heavy metal ion removal from industrial effluent.
Review
Chemistry, Physical
Svetlana Yefremova, Askhat Kablanbekov, Baimakhan Satbaev, Abdurassul Zharmenov
Summary: Adsorption is an important method for water purification, and the development of new, advanced, environmentally friendly, and cost-effective adsorbents with high adsorption capacity and selectivity is necessary. Plant polymers are considered promising adsorbents and can be used as raw materials for the production of adsorption materials. Rice husk is widely used as a universal sorbent due to its abundant availability, low cost, and high content of oxygen-containing functional and silanol groups. Various heat and chemical treatments have been developed to enhance the adsorption properties of rice husk.
Article
Biotechnology & Applied Microbiology
Chuanshuai Chen, Boyu Qu, Wenxiang Wang, Weijian Wang, Guozhao Ji, Aimin Li
Summary: Torrefaction is an effective pretreatment process for biomass, which can enhance energy density and reduce moisture and oxygen contents. The study showed that increasing torrefaction temperature decreased hemicellulose and cellulose contents, while the activation energy increased with torrefaction temperature.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Green & Sustainable Science & Technology
Yuuki Mochizuki, Javzandolgor Bud, Jiaqian Liu, Miki Takahashi, Naoto Tsubouchi
Summary: This study aimed to investigate the Hg adsorption performance of Cl-loaded carbons obtained from chlorination of rice husk char. The results showed that the chlorine content, morphology, and porosity have an impact on Hg adsorption, and the enhancement of Hg adsorption by Cl is positively correlated with the chlorination temperature.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Physics, Applied
Yasuhiko Takeda, Hom Nath Luitel, Shintaro Mizuno
JAPANESE JOURNAL OF APPLIED PHYSICS
(2018)
Article
Physics, Applied
Yasuhiko Takeda, Tadashi Ito, Noboru Yamada, Kazuo Hasegawa, Shintaro Mizuno, Tadashi Ichikawa, Hom Nath Luitel, Hideo Iizuka, Kazuo Higuchi, Hiroshi Ito, Akihisa Ichiki, Tomoyoshi Motohiro
JAPANESE JOURNAL OF APPLIED PHYSICS
(2018)
Article
Optics
Yasuhiko Takeda, Hom Nath Luitel, Shintaro Mizuno
JOURNAL OF LUMINESCENCE
(2018)
Article
Materials Science, Multidisciplinary
Hom Nath Luitel, Rumi Chand, Takanori Watari
Article
Materials Science, Ceramics
Yasuhiko Takeda, Shintaro Mizuno, Hom N. Luitel, Toshihiko Tani
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2019)
Article
Chemistry, Physical
Hom Nath Luitel, Shintaro Mizuno, Yasuhiko Takeda
INTERNATIONAL JOURNAL OF PHOTOENERGY
(2019)
Article
Chemistry, Multidisciplinary
Nan Zhang, Tohru Kawamoto, Yong Jiang, Akira Takahashi, Manabu Ishizaki, Miyuki Asai, Masato Kurihara, Zhenya Zhang, Zhongfang Lei, Durga Parajuli
CHEMISTRY-A EUROPEAN JOURNAL
(2019)
Article
Chemistry, Inorganic & Nuclear
Durga Parajuli, Reynald Ponte, Nan Zhang, Tohru Nakamura, Tohru Kawamoto
INORGANICA CHIMICA ACTA
(2020)
Article
Chemistry, Physical
Durga Parajuli, Hisashi Tanaka, Koji Sakurai, Yukiya Hakuta, Tohru Kawamoto
Summary: Studies on Prussian blue analogs (PBA) have shown that the best condition for complete oxidation of Prussian blue (PB) is gradual heating in the temperature range of 200-220 degrees Celsius until the total mass is decreased by >35%. After this, the temperature could be safely increased to >300 degrees Celsius for the complete oxidative decomposition of PB.
Article
Environmental Sciences
Hisashi Tanaka, Masayuki Fujimoto, Kimitaka Minami, Akira Takahashi, Durga Parajuli, Takehiko Hiwatari, Masami Kawakami, Tohru Kawamoto
Summary: A highly selective adsorbent based on copper hexacyanoferrate was developed to recover ammonium ions from sewage water, demonstrating stable performance with the ability for repeat use.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Physical
Nan Zhang, Tohru Kawamoto, Hiroshi Watanabe, Yong Jiang, Zhenya Zhang, Zhongfang Lei, Durga Parajuli
Summary: The study demonstrated that CoHCF is effective in selectively uptaking potassium from seawater, with the ability to undergo desorption and regeneration through electrochemical methods. The gradual decrease in adsorption capacity due to redox changes of cobalt and iron in the material was observed, while spectroscopic results indicated the valence change of transition metals and exchange of alkali metal cations during different operation stages.
Editorial Material
Chemistry, Physical
Durga Parajuli
Editorial Material
Geochemistry & Geophysics
Zenixole R. Tshentu, Durga Parajuli
Article
Chemistry, Multidisciplinary
Durga Parajuli, Kiwamu Sue, Akira Takahashi, Hisashi Tanaka, Tohru Kawamoto
Article
Chemistry, Multidisciplinary
Yong Jiang, Kimitaka Minami, Koji Sakurai, Akira Takahashi, Durga Parajuli, Zhongfang Lei, Zhenya Zhang, Tohru Kawamoto
Article
Engineering, Chemical
Benjamin De Castro, Mostafa Benzaazoua, Soumali Roychowdhury, Aurelie Chopard, Francis Quintal Lauzon, Benoit Plante
Summary: This study proposes an innovative method using deep learning algorithm and reflected light optical imaging to automatically detect all particles and minerals in acrylic resin polished sections. The experimental results show that this method can accurately detect all mineral particles, including transparent minerals, under reflected light optical microscopy, and provide unbiased mineralogical quantification.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Qiushi Song, Xinyu Du, Changlu Shan, Hongwei Xie, Zhiqiang Ning, Kai Yu
Summary: This study investigated the effect of magnetic stirring on the microstructure of Co deposits during electrowinning in a chloride solution. It was found that magnetic stirring effectively reduced the negative influence of H2 bubbles on the structure of Co deposits and changed their nucleation and growth behavior, resulting in the preparation of high-quality columnar Co crystals.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Tao Ge, Xiaowei Zhou, Liang Xu, Yan Sun, Cheng Yang, Yongpan Tian, Zhuo Zhao
Summary: In this study, the extraction performance and complexation mechanism of p-di-ethyl-amino-methylthiacalix[4]arene (L) towards Pt(IV) were investigated. The results indicated that L had excellent complexation ability towards Pt(IV) and could selectively extract it from a solution containing multiple competing ions.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Yuan Li, Dirk van Zyl
Summary: This paper presents a modified Kynch's approach to explain the hindered settling behavior of suspensions impacted by segregation. The experimental data and predicted results confirm the effectiveness of the proposed method.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Yi Fang, Aurora Robledo-Cabrera, Changsheng Peng, Shan Huang, Qi Xiao, Alejandro Lopez-Valdivieso
Summary: With the assistance of mechanical ball milling, the partially oxidized micro-sponge iron (micro-Fe0@Fe2O3) achieves significantly improved removal of Cr(VI) across a broad pH range. Mechanical force eliminates the surface oxide layer and exposes the Fe0 core, leading to sustained reduction of Cr(VI). The efficiency of micro-Fe0@Fe2O3 is strongly influenced by dissolved oxygen, with higher DO resulting in the generation of stable reductant Fe(II) under acidic conditions, while DO consumption hinders the reduction of Cr(VI) under alkaline conditions due to increased pH. Parameters of ball milling operation, especially rotation speed, have a significant impact on the removal of Cr(VI).
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Alton F. Grabsch, Phillip D. Fawell, Michael G. Davies
Summary: High molecular weight partially hydrolysed polyacrylamide (PHPA) is commonly used in mineral exploration drilling to increase fluid viscosity and help maintain the suspension of fine particles. However, clarifying these suspensions can be difficult, and previous studies have found that anionic flocculants are ineffective. This study confirmed that nonionic flocculants can successfully aggregate the particles, indicating that the charged tails of adsorbed PHPA prevent anionic flocculants from accessing the particle surfaces.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
J. S. Guiral-Vega, L. Perez-Barnuevo, J. Bouchard, A. Ure, E. Poulin, C. Du Breuil
Summary: This paper introduces an approach that combines particle properties and process modeling to describe the behavior of iron ore in a laboratory-scale drum-type magnetic separator. Early information on iron ore processing behavior can be obtained through laboratory testing, automated mineralogy analysis, and process modeling.
MINERALS ENGINEERING
(2024)
Review
Engineering, Chemical
Sayed Janishar Anzoom, Ghislain Bournival, Seher Ata
Summary: This review discusses the benefits and challenges of coarse particle flotation, as well as recent developments in improving the process. Coarse particle flotation has various applications and offers advantages in technical, economic, and sustainability aspects. However, it also faces challenges such as particle detachment, transfer between phases, and persistence in the froth phase. Technological advancements, such as fluidized-bed flotation and processes enhancing bubble-particle attachment, have shown promising results in efficiently recovering larger particles.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Yimei Xiao, Jinchan Feng, Bingqiao Yang, Huihua Luo, Fang Zhou
Summary: In this study, the use of fulvic acid as a depressant for the flotation separation of chalcopyrite from arsenopyrite was investigated. It was found that fulvic acid strongly depressed arsenopyrite while having little influence on chalcopyrite flotation. The addition of calcium hypochlorite facilitated the adsorption of fulvic acid on arsenopyrite surface.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Bo Hao, Minqiang Fan
Summary: Particle-bubble attachment is crucial in coal and mineral flotation processes. In this study, the attachment process of low-rank coal particles to the bubble surface was simulated, revealing the important role of water film rupture in particle attachment.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Shuwei Wu, Shuai Wang, Guoqiang Wang, Longfei Fan, Jianbo Guo, Zhengbin Liu, Haoyan Zhang, Wei Guan, Yukuan Wang, Yewei Wu
Summary: This study analyzes the motion mode of eccentric roller crushers and proposes a calculation method for productivity. Through laboratory experiments, the results indicate that the proposed method can effectively estimate the productivity of eccentric roll crushers.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Hanna Miettinen, Malin Bomberg, Ozlem Bicak, Zafir Ekmekci, Paivi Kinnunen
Summary: Mineral processing requires large amounts of water, and reducing water consumption through recirculation and closing water loops is important. However, this can lead to the accumulation of contaminants in the process water, which can negatively affect the process performance. In this study, the impact of microorganisms on flotation performance was investigated, and ion exchange was evaluated for removing dissolved sulfur species and microorganisms from water. The results showed that adding microorganisms had a positive effect on flotation selectivity, especially for nickel. Different water types, process water and final tailings water, behaved slightly differently. Ion exchange proved to be effective in removing sulfur species and microorganisms, and dissolved air flotation was a successful pretreatment for ion exchange in removing microorganisms.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Canneng Chen, Song Zhang, Quanjun Liu, Luzheng Chen, Yongjun Xian, Yijie Wang
Summary: This study introduces the use of ultrasonic pretreatment to enhance the flotation separation of elemental sulfur and silver-bearing lead minerals from ultrafine residue. The results show that ultrasonic pretreatment effectively liberates associated sulfur and improves the separation of sulfur and silver-bearing lead minerals. Under optimized conditions, ultrasonic pretreatment significantly improves the recovery and grade of sulfur in the concentrate, as well as the recovery of lead and silver in the tailings.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Genzhuang Li, Fisher Wang, Bern Klein, Michael Deal, Aaron Wright, Hector Mezquita
Summary: This paper presents a stress-based approach for predicting and improving large-scale HIG mill performance through experimental testing and model calibration.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Runpeng Liao, Shuming Wen, Jian Liu, Shaojun Bai, Qicheng Feng
Summary: This study demonstrates that the use of a DDA/DDTC mixed collector system can significantly improve the flotation performance of smithsonite. The synergistic effect between DDA and DDTC is confirmed, and the mixed collector system contributes to a decrease in solution surface tension. The use of FT-IR and XPS confirms the simultaneous physisorption and chemisorption of DDA and DDTC on the smithsonite surface, and contact angle measurements show that the mixed collector effectively enhances the hydrophobicity of smithsonite. Molecular dynamics simulations reveal the multilayer adsorption of DDTC and DDA on the smithsonite surface, with DDTC promoting the adsorption of DDA.
MINERALS ENGINEERING
(2024)