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71.
72.
Eshraq Ahmed Abdullah Abdul Halim Abdullah Zulkarnain Zainal Mohd Zobir Hussein Tan Kar Ban 《环境科学学报(英文版)》2012,24(10):1876-1884
A modified hydrophilic penta-bismuth hepta-oxide nitrate (Bi5O7NO3) surface was synthesized via a precipitation method using TiO2 and Ag as modified agents. The synthesized product was characterized by different analytical techniques. The removal efficiency was evaluated using mono-and di-sulphonated azo dyes as model pollutants. Different kinetic, isotherm and diffusion models were chosen to describe the adsorption process. X-ray photoelectron spectroscopy (XPS) results revealed no noticeable differences in the chemical states of modified adsorbent when compared to pure Bi5O7NO3;however, the presence of hydrophilic centres such as TiO2 and Ag developed positively charged surface groups and improved its adsorption performance to a wide range of azo dyes. Dyes removal was found to be a function of adsorbent dosage, initial dye concentration, solution pH and temperature. The reduction of Langmuir 1,2-mixed order kinetics to the second or first-order kinetics could be successfully used to describe the adsorption of dyes onto the modified adsorbent. Mass transfer can be described by intra-particle diffusion at a certain stage, but it was not the rate limiting step that controlled the adsorption process. Homogenous behavior of adsorbent surface can be explored by applying Langmuir isotherm to fit the adsorption data. 相似文献
73.
Babalghaith Ali Mohammed Koting Suhana Sulong Nor Hafizah Ramli Khan Md Zahid Hossain Milad Abdalrhman Yusoff Nur Izzi Md. Ibrahim Mohd Rasdan Mohamed Abdul Halim bin Nagor 《Environmental science and pollution research international》2022,29(24):35557-35582
Environmental Science and Pollution Research - The daily utilization of a large amount of raw materials is causing a rapid depletion of natural resources. The growth of the human population is... 相似文献
74.
Pang Swee Yun Suratman Suhaimi Latif Mohd Talib Khan Md Firoz Simoneit Bernd R. T. Mohd Tahir Norhayati 《Environmental science and pollution research international》2022,29(11):15849-15862
Environmental Science and Pollution Research - Surface sediments along the Southern Terengganu coast (≤7 km from the coast) were analyzed for polycyclic aromatic hydrocarbons (PAHs). The... 相似文献
75.
Environmental Modeling & Assessment - A key problem in ecology is to predict the presence/absence of species across a geographical region. Addressing this problem in a multi-species community... 相似文献
76.
Tan T.-W. Abu Bakar N. H. H. Abu Bakar M. Abdul Talib N. N. 《Journal of Polymers and the Environment》2022,30(1):179-193
Journal of Polymers and the Environment - The catalytic degradation of chitosan (CS) using halloysite nanotubes-supported lanthanum(III) (HNT-La3+) catalysts have been studied. The HNT-La3+... 相似文献
77.
The adsorption of a synthetic textile dye (Remazol Brilliant Black Reactive) on cocoa pod husk-based activated carbon was investigated in batch process. The adsorbent prepared was characterized by gas adsorption surface analysis (Brunauer Emmett Teller, BET), scanning electron microscopy, and Fourier transform infrared spectroscopy. The effects of initial dye concentration, contact time, solution temperature, and solution pH were evaluated. Equilibrium data were fitted to Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm models, the first being the best with maximum monolayer coverage of 111?mg?g?1. Kinetic data were fitted into pseudo-first-order, pseudo-second-order, intraparticle diffusion, and Elovich models; the pseudo second-order model provided the best correlation. Maximum adsorption was observed at pH 7. Standard free energy, standard enthalpy, and standard entropy were also calculated. The adsorption interaction was found to be endothermic and spontaneous. Both the mean free energy of adsorption and the activation energy show that the mechanism is by physisorption. 相似文献
78.
Fresh and healthy specimens of Oreochromis niloticus (mean weight 70.5± 1.23 g and mean length, 12.3± 1.5cm) and Clarias gariepinus (mean weight, 41.8±2.3 g and mean length 13.78 ± 1.2 cm) were exposed to heavy metal lead, ranging in concentration from 10 to 18 mg L‐1 for O. niloticus and 20 to 28 mg L‐1 for C. gariepinus respectively. The 96 h LC50 for both the species was computed as 12.45 mg L‐1 (O. niloticus) and 22.65 mg L‐1 (C. gariepinus). The cichlid fish was exposed to sublethal concentration of lead (2, 4 and 6 mgL‐1) and catfish (4, 8 and 12 mgL‐1). The erythrocytes count, haemoglobin concentration, haematocrit and the value of serum glucose increased significantly (P < 0.01), whereas leucocytes count, serum protein and serum triglyceride after intoxication declined in both the species with the same pattern but in different quantity. After 96 h of time a significant depletion of muscle and liver glycogen was noted, being greater in muscle (16.7% in O. niloticus) and in liver (15.9% in C. gariepinus). The response of fish to lead was dose dependent. 相似文献
79.
Malik Nur Khaliesah Abdul Manaf Latifah Abd Jamil Nor Rohaizah Rosli Mohd Hafiz Ash’aari Zulfa Hanan Othman Mohamad Al-Ekhwan 《Journal of Material Cycles and Waste Management》2021,23(4):1289-1302
Journal of Material Cycles and Waste Management - The accumulation of floatable litter load captured in gross pollutant trap (GPT) due to the hydrological runoff has become challenging due to rapid... 相似文献
80.
Amanchi NR Hussain MM 《Journal of environmental biology / Academy of Environmental Biology, India》2010,31(5):603-607
Experiments were conducted to evaluate the toxic effects ofmonocrotophos in ciliate models Paramecium caudatum and Oxytricha fallax. In acute toxicity studies higherconcentrations of monocrotophos caused marked increase in mobility of cells exhibiting rocking movements within two mins of exposure but were decreased after 30 mins. LC50 value by mortality curve for 3 hr acute toxicity test of Oxytricha fallax and Paramecium caudatum was found 307.744 +/- 33.27 mg l(-1) and 332.284 +/- 57.52 mg l(-1) respectively. Oxytricha fallax was found sensitive than Paramecium caudatum to monocrotophos. In acute exposure cells showed deformities such as swelling, oval shaped deformity and in higher concentrations shortening of longitudinal axis with blackening of cytoplasm occurred. The length of paramecia was reduced prominently. Similarly enlargement of contractile vacuole and stress egestion of food vacuoles was also observed. The morphological studies showed the changes in shape, size, colour and width of Paramecia and Oxytricha. Frequencies of macronuclear aberrations were significant showing deformities such as rod shaped, elongation, fragmentation, diffusion and total absence of nucleus and were concentration dependent. The data provided in the present study on interaction of pesticides with nuclear structure can be of immense value because most of these pesticides have been reported to have carcinogenic, mutagenic and teratogenic properties. 相似文献