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51.
Cr(VI) contamination of soil and groundwater is considered a major environmental concern. Bioreduction of Cr(VI) to Cr(III)
can be considered a potentially effective technology in remediating Cr(VI) contaminated sites. Shewanella oneidensis MR-1 (MR-1) is one of the bacteria capable of reducing Cr(VI) to Cr(III) under anaerobic conditions. The kinetics of Cr(VI)
reduction by MR-1 is defined by the dual-enzyme kinetic model which is nonlinear, transient, and zero-order. Existing transport
models are not designed to simulate such reaction kinetics. The objective of this paper is to present a Petrov–Galerkin finite
element model (PGFEM) to simulate transport and bioreduction of Cr(VI), by MR-1, in groundwater. The model developed is unconditionally
stable and provides oscillation free accurate results for a wide range of Peclet number (Pn) and Courant number (Cn). 相似文献
52.
Habib Razmi Vahideh Abdollahi Rahim Mohammad-Rezaei 《Environmental Chemistry Letters》2016,14(4):521-526
In solid-phase extraction, the sorbent controls selectivity, affinity, and loading capacity. Many sorbents can be used, such as functionalized resin, naphthalene, activated carbon, molecular-imprinted polymers, and nanometer-sized materials. Here, we prepared a nanocomposite made of graphene quantum dots and eggshell to extract polycyclic aromatic hydrocarbons from aqueous solutions. We studied the effect of sample volume, solution pH, amount of nanosorbent, and sample loading flow rate on the extraction efficiency. We obtained a wide dynamic linear range from 0.1 to 200 ng m/L, good linearity with r 2 higher than 0.99, and low-detection limits of 5–75 pg m/L. We measured PAH in spiked water samples. 相似文献
53.
M. Z. Ahmad Thirmizir Z. A. Mohd Ishak R. Mat Taib S. Rahim S. Mohamad Jani 《Journal of Polymers and the Environment》2011,19(1):263-273
Natural weathering was performed on poly(butylene succinate) (PBS) and its kenaf bast fibre (KBF) filled composites by exposing
the specimens to a tropical climate for a period of 6 months (max–min temperature: 31.5–23.9 °C; relative humidity: 78.9%).
The aim of this study was to investigate the effects of KBF loading and the addition of maleated PBS compatibiliser (PBSgMA)
on the performance of the composites under natural weathering. As expected, the flexural properties of both the uncompatibilised
and compatibilised composites dropped with increasing exposure time. The weathered specimens were also assessed by colour
change analysis, FTIR spectroscopy analysis and SEM examination. The total colour change, ΔE
ab
, of both the uncompatibilised and compatibilised composites increased with weathering time. FTIR spectroscopy analysis confirmed
the presence of oxidation products such as hydroxyl, carbonyl and vinyl species in the weathered uncompatibilised and compatibilised
composites. SEM examination revealed the presence of surface defects such as cracking, tiny holes and degraded fibre, which
explain the poor performance of the composites upon weathering. 相似文献
54.
Bahador Bahrami Tayebeh Behzad Akram Zamani Pejman Heidarian Bijan Nasri-Nasrabadi 《Journal of Polymers and the Environment》2018,26(10):4085-4094
Cellulose nanofibers (CNFs) were isolated from sugarcane bagasse (SCB) through the combination of bio-refinery, sulfur-free, and totally chlorine free (TCF) chemo-mechanical pretreatments, with a focus on the optimal design of ozone bleaching parameters based on a response surface methodology (RSM). For this purpose, the most effective parameters in ozone bleaching (temperature, time, and pulp consistency) were set between 40 and 85 °C, 60 and 360 min, and 1–5 wt%, respectively. High-performance liquid chromatography (HPLC), Fourier transform infrared spectroscopy (FTIR), Kappa number, and scanning electron microscopy (SEM) were used to chemically and morphologically characterize the SCB fibers. The size distribution and morphology of CNFs were also evaluated by dynamic light scattering (DLS) and transmission electron microscopy (TEM). HPLC analysis revealed that percentage of cellulose increased from 41.5 to 91.39% after chemical pretreatments. FTIR and Kappa number analyses also confirmed the successful isolation of cellulose fibers from the SCB fibers after chemical pretreatments. Furthermore, DLS results showed that the hydrodynamic diameter of the isolated cellulose fibers reduced to 268 nm by dint of ultrasonication. Additionally, TEM images confirmed the isolation of CNFs: the average diameter of cellulose fibers decreased to about 28 nm after mechanical steps and the yield of fibrillation was found to be around 99%. According to the obtained results, the applied chemo-mechanical treatment appears to be promising for green and facile isolation of CNFs. 相似文献
55.
56.
Tony Hadibarat Abdull Rahim Mohd Yusoff Azmi Aris Risky Ayu Kristanti 《环境科学学报(英文版)》2012,24(4):728-732
Armillaria sp. F022, a white rot fungus isolated from tropical rain forest (Samarinda, Indonesia) was used to biodegrade naphthalene in cultured medium. Transformation of naphthalene by Armillaria sp. F022 which is able to use naphthalene, a two ring-polycyclic aromatic hydrocarbon (PAH) as a source of carbon and energy was investigated. The metabolic pathway was elucidated by identifying metabolites, biotransformation studies and monitoring enzyme activities in cell-free extracts. The identification of metabolites suggests that Armillaria sp. F022 initiates its attack on naphthalene by dioxygenation at its C-1 and C-4 positions to give 1,4-naphthoquinone. The intermediate 2-hydroxybenzaldehyde and salicylic acid, and the characteristic of the meta-cleavage of the resulting diol were identified in the long-term incubation. A part from typical metabolites of naphthalene degradation known from mesophiles, benzoic acid was identified as the next intermediate for the naphthalene pathway of this Armillaria sp. F022. Neither phthalic acid, catechol and cis,cis-muconic acid metabolites were detected in culture extracts. Several enzymes (manganese peroxidase, lignin peroxidase, laccase, 1,2-dioxygenase and 2,3-dioxygenase) produced by Armillaria sp. F022 were detected during the incubation. 相似文献
57.
Hussain Sajjad Mubeen Muhammad Ahmad Ashfaq Akram Waseem Hammad Hafiz Mohkum Ali Mazhar Masood Nasir Amin Asad Farid Hafiz Umar Sultana Syeda Refat Fahad Shah Wang Depeng Nasim Wajid 《Environmental science and pollution research international》2020,27(32):39676-39692
Environmental Science and Pollution Research - Land use/land cover (LULC) change has serious implications for environment as LULC is directly related to land degradation over a period of time and... 相似文献
58.
Cao Jianhong Law Siong Hook Samad Abdul Rahim Bin Abdul Mohamad Wan Norhidayah Binti W. Wang Jianlong Yang Xiaodong 《Environmental science and pollution research international》2021,28(35):48053-48069
Environmental Science and Pollution Research - China’s green growth has shown a trend of fluctuation year by year. Simultaneously, Chinese local governments have pursued simple economic... 相似文献
59.
60.
Azeem Aamir Naseem Muhammad Akram Hassan Naveed Ul Butt Ijaz Aslam Muhammad Toseef Ali Shahid Jadoon Atif khan 《Environmental science and pollution research international》2023,30(5):11431-11442
Environmental Science and Pollution Research - This research article examines the impact of stock market capitalization on carbon emissions using forty high carbon-emitting countries from 1996 to... 相似文献