Article
Engineering, Environmental
Abdul Samad Kamdod, Malladi V. Pavan Kumar
Summary: In this study, two adsorbents, coconut shell activated carbon and a composite of coconut shell activated carbon with chitosan, were prepared and tested for their adsorption capacity for methylene blue, methyl orange, and crystal violet. The adsorbents showed high adsorption capacities, and the optimal conditions for adsorption were identified. The adsorption mechanism was found to involve rate-limiting steps other than intra-particle diffusion.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2022)
Article
Chemistry, Multidisciplinary
Jia Xu, Qianhui Ma, Wen Feng, Xiaopeng Zhang, Qiang Lin, Chenghang You, Xianghui Wang
Summary: In this study, Fe3O4/CBc composite was successfully prepared and used for the degradation of methyl orange in water. The catalyst exhibited excellent removal performance, abundant porous structure, and obvious magnetization. Additionally, Fe3O4/CBc showed high stability and easy recyclability.
Article
Nanoscience & Nanotechnology
Zhihua Deng, Shixian Sun, Huijuan Li, Duo Pan, Rahul Rangrao Patil, Zhanhu Guo, Ilwoo Seok
Summary: The study investigated the purification of wastewater containing heavy metals using coconut shell-based activated carbon modified by different agents. The modification significantly reduced adsorption equilibrium time, decreased carbon adsorbent addition, and improved removal purification. The agents of acid, alkali, and potassium showed better impact on purification than iron salt, successfully removing over 90% of pollutants with a 1-g dosage of adsorbent. Additionally, increasing adsorption reaction time and the amount of adsorbent showed a direct relationship to the adsorption effect.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Energy & Fuels
Lawal Sirajo, Muhammad Abbas Ahmad Zaini
Summary: This study aimed to evaluate the removal of orthophosphate from water using iron-loaded adsorbents derived from coconut shells. The results showed that IC-CSA had the largest specific surface area and maximum orthophosphate removal, making it an effective adsorbent for reducing eutrophication in water.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Materials Science, Multidisciplinary
Wahyu Widanarto, Siska Irma Budianti, Sib Krishna Ghoshal, Candra Kurniawan, Erfan Handoko, Mudrik Alaydrus
Summary: In this study, a new type of activated carbon sample containing fullerene-C70 was derived from coconut shells using physical activation and milling process. The crystalline phase and microwave reflection loss of the activated fullerene-C70 were found to be influenced by milling time. The activated carbon showed a high specific surface area and low mean pore diameter, indicating its potential for producing low-cost and efficient microwave absorption materials for electronic devices with reduced electromagnetic interference.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Biotechnology & Applied Microbiology
Aniyohana Valencia, Roberto Muniz-Valencia, Silvia G. Ceballos-Magana, Cintia Karina Rojas-Mayorga, Adrian Bonilla-Petriciolet, Jorge Gonzalez, Ismael Alejandro Aguayo-Villarreal
Summary: New activated carbons were prepared from coconut shell to separate benzene and cyclohexane. The best preparation conditions were identified using a Taguchi experimental design. The activating agent, impregnation ratio, and physical activation time were found to be the most important variables. The activated carbon obtained with ZnCl2 showed the highest adsorption properties for benzene and cyclohexane separation at an industrial level.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Chemistry, Inorganic & Nuclear
Tejovathi Gudipati, M. Burhanuz Zaman, Pragya Singh, Rajaram Poolla
Summary: In this study, CuO nanostructures were biogenically synthesized using Tamarindus indica L fruit extract. The nanostructures showed potential applications in photocatalytic dye degradation.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Environmental Sciences
Yean Ling Pang, Zhi Xuan Law, Steven Lim, Yin Yin Chan, Siew Hoong Shuit, Woon Chan Chong, Chin Wei Lai
Summary: The study focused on synthesizing and characterizing various biochar composites, with g-C3N4/biochar demonstrating the highest photocatalytic activity. Response surface methodology was used to analyze the interactive effects of different parameters on the photocatalytic degradation of methyl orange, providing guidance for further optimization of the process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Elvio N. Oliveira, Alex T. Meneses, Samara F. de Melo, Franciele M. R. Dias, Maisa T. B. Perazzini, Hugo Perazzini, Lucas Meili, Joao Soletti, Sandra H. Carvalho, Mozart D. Bispo
Summary: Coconut waste can be utilized as a feedstock to produce activated carbon for caffeine removal from water and wastewater. This study demonstrates that coconut leaves waste can be successfully converted into activated carbon with a high surface area and suitable pore structure by pyrolysis at high temperature and activation with potassium carbonate.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Zhihua Deng, Qiuhan Zhang, Qing Deng, Zhanhu Guo, Ilwoo Seok
Summary: In this study, the impregnation method was used to modify coconut shell activated carbon for purifying acetone exhaust gas. The results showed that 1% KOH modified activated carbon exhibited the highest adsorption performance, with the Langmuir adsorption isotherm model and Bangham kinetic model fitting the adsorption process well.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Engineering, Chemical
Chaiyot Tangsathitkulchai, Suravit Naksusuk, Atichat Wongkoblap, Poomiwat Phadungbut, Prapassorn Borisut
Summary: The study investigated the equilibrium and kinetics of CO2 adsorption by coconut-shell activated carbon impregnated with sodium hydroxide at 273 K. The CO2 adsorption increased with NaOH loading and exhibited three distinctive regions. The results showed an empirical correlation between effective pore diffusivity, CO2 adsorption, and NaOH loading.
Article
Nanoscience & Nanotechnology
Zhihua Deng, Qing Deng, Linqi Wang, Ping Xiang, Jing Lin, Vignesh Murugadoss, Gang Song
Summary: Coconut shell-activated carbon was modified using the impregnation method, with 1% KOH identified as the best modifier. The equilibrium adsorption capacity of acetone by the modified activated carbon reached 0.96 mg g(-1). The study discussed the effects of inlet time, flow rate, concentration, and temperature on the removal efficiency of benzene, finding that these factors had varying impacts on the benzene removal process. Analysis of the purification and adsorption mechanisms was conducted using BET and FTIR, with the results indicating that the Bangham kinetic model best fit the equilibrium adsorption capacity of benzene.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Energy & Fuels
Mousumi Bora, Dhrubajyoti Bhattacharjya, Swapnali Hazarika, Xing Fan, Binoy K. Saikia
Summary: In this study, an improved activated carbon material was created by blending waste coconut shell-based activated carbon and low-grade coal powder. The mixed-blend material exhibited excellent electrochemical performance and a prototype supercapacitor using this material was able to light an LED for an hour.
Article
Metallurgy & Metallurgical Engineering
Hong-ming Long, Bang-fu Huang, Zhe Shi, Lan-peng Liu, De-fu Wang, Lu Li
Summary: Fe-loaded activated carbon has high surface acidity and manganese-loaded AC has high oxygen content. The study aimed to reveal the modification mechanism of coconut husk AC modified by Fe-Mn. The effects of HNO3, Fe(NO3)(3), and Mn(NO3)(2) on the pore texture and surface chemical characteristics of carbon materials were examined, showing differences in surface topography, pore structure, active material, and functional groups between AC, HNO3/AC, and Fe-Mn/AC.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Hai Zhu, Junqiang Qiu, Dan Zhou, Haiyang Wang, Dan Xu, Haixia Li
Summary: A series of activated carbon adsorbents (CFAC-n, n = 1,2,3,4) with higher adsorption capacity for chloramphenicol (CHL) were synthesized. The specific surface area was found to be positively correlated with the adsorption capacity, with CFAC-3 showing the highest specific surface area and best adsorption amount. The adsorption conditions, including adsorbent dosage, antibiotic initial concentration, adsorption temperature and pH value, directly influenced the adsorption effect. The adsorption process was found to be heterogeneous chemisorption, involving hydrogen bond, pi-pi conjugation interactions, and electrostatic interaction.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.