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1.
Decomposition of perfluorocarboxylic acids (PFCAs) by heterogeneous photocatalysis in acidic aqueous medium 总被引:4,自引:0,他引:4
Sri Chandana Panchangam Angela Yu-Chen Lin Khaja Lateef Shaik Cheng-Fang Lin 《Chemosphere》2009,77(2):242-248
Decomposition of perfluorocarboxylic acids (PFCAs) is of prime importance since they are recognized as persistent organic pollutants and are widespread in the environment. PFCAs with longer carbon chain length are particularly of interest because of their noted recalcitrance, toxicity, and bioaccumulation. Here in this study, we demonstrate efficient decomposition of three important PFCAs such as perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA) and perfluorodecanoic acid (PFDA) by heterogeneous photocatalysis with TiO2 as a photocatalyst in acidic aqueous solutions. The PFCAs were decomposed into shorter carbon chain length PFCAs and fluoride ions. Photoholes of excited TiO2 generated upon UV-irradiation are found to be the oxidation sites for PFCAs. Therefore, creation and sustenance of these photoholes in the acidic aqueous medium has enhanced the decomposition of PFCAs. Heterogeneous photocatalytic treatment achieved more than 99% decomposition and 38% complete mineralization of PFOA in 7 h. The decomposition of other PFCAs was as high as 99% with a defluorination efficiency of 38% for PFDA and 54% for PFNA. The presence of perchloric acid was found to enhance the decomposition by facilitating the ionization of PFCAs. The oxygen present in the medium served both as an oxidant and an electron acceptor. The mechanistic details of PFCA decomposition and their corresponding mineralization are elaborated. 相似文献
2.
Adeniyi Lateef A. Akinpelu Olusegun P. Fatoke Michael T. Adeniji Margaret A. 《Journal of Material Cycles and Waste Management》2022,24(5):1948-1957
Journal of Material Cycles and Waste Management - This study investigates solid-waste handling practices by municipal waste collectors during COVID-19 pandemic period in Osogbo urban areas with the... 相似文献
3.
Salami Babatunde Abiodun Oyehan Tajudeen Adeyinka Gambo Yahya Badmus Suaibu O. Tanimu Gazali Adamu Sagir Lateef Saheed A. Saleh Tawfik A. 《Environmental science and pollution research international》2022,29(28):42560-42600
Environmental Science and Pollution Research - Water and wastewater treatment applications stand to benefit immensely from the design and development of new materials based on silica nanoparticles... 相似文献
4.
Malik Lateef Ahmad Bashir Arshid Qureashi Aaliya Pandith Altaf Hussain 《Environmental Chemistry Letters》2019,17(4):1495-1521
Environmental Chemistry Letters - In aqueous systems, heavy metal ions, when present in excess than permissible limits, are dangerous for human beings and aquatic life. Heavy metals cannot be... 相似文献
5.
Removal of antibiotics and non-steroidal anti-inflammatory drugs by extended sludge age biological process 总被引:2,自引:0,他引:2
Tsung-Hsien Yu Angela Yu-Chen Lin Shaik Khaja Lateef Cheng-Fang Lin Ping-Yi Yang 《Chemosphere》2009,77(2):175-181
Removal of four antibiotics (sulfamethoxazole, sulfadimethoxine, sulfamethazine and trimethoprim) and four non-steroidal anti-inflammatory drugs (acetaminophen, ibuprofen, ketoprofen and naproxen) using extended sludge age biological process was investigated. The sludge age of the biological system was greater than 200 d. Hydraulic retention time of 12 h was maintained throughout the experiment. The extended sludge age biological process is able to treat pharmaceuticals with good and steady removal efficiencies: 64–93% removal for antibiotics over 1–5 μg L−1 influent concentrations and 94% to complete removal for acetaminophen and ibuprofen with a wide range of influent concentrations 1–100 μg L−1. For ketoprofen and naproxen the removal efficiencies are 79–96% over a range of 1–15 μg L−1 influent concentrations. The removal efficiency decreases with increasing initial concentrations for all target compounds except for ibuprofen. This indicates that the initial influent concentration is an important parameter for the studies of fate of pharmaceuticals. The amount of bio-mass and size of the reactor required to achieve good and steady removal efficiencies for known influent pharmaceutical concentrations are also suggested in this study. 相似文献
6.
Takaki Yamashiro Suraju A. Lateef Chun Ying Nilmini Beneragama Milos Lukic Iwasaki Masahiro Ikko Ihara Takehiro Nishida Kazutaka Umetsu 《Journal of Material Cycles and Waste Management》2013,15(4):539-547
Anaerobic co-digestion of dairy manure (DM) and concentrated food processing wastes (FPW) under thermophilic (55 °C) and mesophilic (35 °C) temperatures, and fertilizer value of the effluent were investigated in this study. Two types of influent feedstock were utilized: 100 % DM and a 7:3 mixture (wet weight basis) of DM and FPW. The contents of the FPW, as feedstock were 3:3:3:1 mixture of cheese whey, animal blood, used cooking oil and residue of fried potato. Four continuous digestion experiments were carried out in 10 L digesters. Co-digestion under thermophilic temperature increased methane production per digester volume. However, co-digestion at 35 °C was inhibited. Total Kjeldahl nitrogen (N) recovered after digestion ranged from 73.1 to 91.9 %, while recoveries of ammonium nitrogen (NH4-N) exceeded 100 %. The high recovery of NH4-N was attributed to mineralization of influent organic N. The mixture of DM and FPW showed greater recoveries of NH4-N after digestion compared to DM only, reflecting its greater organic N degradability. The ratios of extractable to total calcium, phosphorus and magnesium were slightly reduced after digestion. These results indicate that co-digestion of DM and FPW under thermophilic temperature enhances methane production and offers additional benefit of organic fertilizer creation. 相似文献
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8.
The resistance pattern and mechanisms of bacterial isolates obtained from clinical origin, soil, industrial effluent, orange juice products and drinking water were studied using commonly used antibiotics. The microbial load of the water samples, industrial effluent and orange juice products were 1.0 × 101–2.25 × 106, 2.15 × 105, and 3.5 × 104–2.15 × 105 cfu mL–1, respectively. The faecal coliform test revealed that only two out of twenty orange juice products had MPN of 2 and 20, the MPN of water ranged from 1–1800, while the effluent had MPN of 1800. The bacterial isolates that were isolated include E. coli, S. aureus, P. vulgaris, S. marcescens, S. pyogenes, B. cereus, B. subtilis, Micrococcus sp., Klebsiella sp., P. aeruginosa, and Enterobacter sp. Also, clinical and soil isolates of P. aeruginosa were used in the study. Among the eight antibiotics tested for resistance on five strains of each bacterium, seven different resistance patterns were observed among the bacterial isolates obtained from water, effluent and orange juice products. Among the clinical and soil isolates of P. aeruginosa, four multiple-drug resistance patterns were obtained. Thirty strains of E. coli and S. aureus were tested for -lactamase production and fourteen strains, seven each of E. coli and S. aureus that had high Minimum Inhibitory Concentration values (MIC) for both Amoxycillin and Cloxacillin were positive. 相似文献
9.
Bashir Arshid Malik Lateef Ahmad Ahad Sozia Manzoor Taniya Bhat Mudasir Ahmad Dar G. N. Pandith Altaf Hussain 《Environmental Chemistry Letters》2019,17(2):729-754
Environmental Chemistry Letters - Pollution due to heavy metals is currently a serious problems affecting water bodies. The removal of heavy metals is of great concern due to their toxicity at... 相似文献
10.
Adeniyi Lateef Adeleke Afon Abel Omoniyi 《Journal of Material Cycles and Waste Management》2022,24(3):1172-1181
Journal of Material Cycles and Waste Management - This research investigates the types and quantity of different components of solid waste produced at Obafemi Awolowo University, Ile-Ife (OAU)... 相似文献