Volume-12 ~ Issue-11 ~ November 2019

Abstract: Improving the efficiency of Indonesia's natural zeolites can be done through a modification process. The expected results of the natural zeolite modification can be applied to several remedies to the interests of the environment to control the population of pathogenic microorganisms that tend to have a negatively charge. Natural zeolite is aluminosilicate compounds with porous structure and a negative charge on the surface. Zeolite surface negative charge is neutralized by cations that can be exchanged with other cations, including cationic surfactant. Cationic surfactants such as HDTMA+ (Hexadecyltrimethylammonium) has a large molecular size that can only be exchanged with cations in the external surface of natural zeolite. Zeolite surface modification was carried......

[1]. Bekkum, H.V., Flanigen, E.M., Jansen, J.C., 1991, "Introduction to Zeolite Science and Practise", Elsevier, Netherland
[2]. Bowman, R.S., 2002, Surfactant-Modified Zeolites (SMZ)-aversatile inexpensive Sorbent For Removing Contaminant From Water, New Mexico Tech
[3]. Reeve, Peter J.,Fallowfield, Howard J., 2018, Natural and surfactant modified zeolites: A review of their applications for waterremediation with a focus on surfactant desorption and toxicity towards microorganisms, Journal of Environmental Management 205 (2018) 253-261
[4]. Hrenovic, J., et al, 2008, Interaction of Surfactant-Modified Zeolites and Phosphat Accumulating Bacteria, Journal of Hazardous Material 156 (2008) 576-582
[5]. Bowman, 2003, Surfactant-Modified Zeolites (SMZ) and Their Applications to Environmental Remediation, Earth and Environmental Science, New Mexico Tech

Abstract: Dioxin-like compounds such PCB-77 are highly toxic environmental persistent organic pollutants. Their environmental persistence nature is due to strong carbon-chlorine (C-Cl) bonds on their structure making them harmful to both humans and especially aquatic life. Due to this, their international production was banned by the Stockholm convention on POPs in 2001. However, poorly managed landfills and incinerators could still release them into our environment. One way of reducing their toxicity is by chemical degradation by an aid of a catalyst. This research was designed to explore the ability of palladium-copper (Pd-Cu) bimetallic aerogels as catalysts for degradation of PCB 77, a dioxin like compound which is classified as a carcinogen. Three ratios of Pd-Cu (1:1, 1:5, 1:10) were synthesized......

Keywords: Dioxine, Pd-Cu, Nanocatalyst, PCB47.

[1]. WHO/Dioxins and their health effect on human health (2016) www.WHO.int>.Mediacentre> factcsheets.
[2]. Stockholm Convention on Persistent Organic Pollutants (POPs), (2002) Geneva, Secretariat of the Stockholm Convention (http://chm.pops.int).
[3]. Rahumann.M.S.M.M.Pistone L., Trrifiro F.and Miertus S*(2000) Destruction technologies for polychlorinated biphenyls (PCBs) ICS-UNIDO 55pages. Aerogels Without pressure https://www.aerogel.org.
[4]. Liu, J., Qin, G., Raveendran, P., Ikushima, Y., (2006) Facile Green Synthesis, Characterization, and Catalytic Function of β-D-Glucose-Stabilized Au Nanocrystals. Chem. Eur. J.12, 2131–2138.
[5]. Sharma,G.Kumar,A.Sharma,S.,Naushad,M.,Dwivedi,R.P.,ALothman,Z.A.,Mola,G.T.,(2017)Novel development of nanoparticles to bimetallic nanoparticles and their composites. A Journal of King Usaid. A review .www.science direct.com.

Abstract: The contamination of the marine environment by organic pollutants is of great concern. The Bizerte Lagoon is the second largest lagoon in Tunisia, and is known for different industrial and fishing activities. Due to their social and economic impact, a comprehensive assessment of the spatial distribution and partitioning of seven OCPs between suspended particulate matter (SPM) and surface sediments is essential. Total organic carbon (TOC) contents in sediment ranges from 0.05% found in station S3 to 5.22% found in station S5. The OCPs were investigated in SPM and sediment from fourteen sampling stations in the Bizerte Lagoon. The levels of OCPs in SPM varied between 0.91 ng g-1 and 15.15 ng g-1. The concentrations of OCPs in sediments are in the range of 0.09-18.29 ng g-1. The Hexachlorobenzene (HCB) and ΣDDT are the most dominant compounds in different studied matrices. Distribution of HCB, ΣDDT and other OCPs are different indicating different sources of contaminations. The concentrations of OCPs in different matrices are generally similar to the background levels from the Mediterranean Sea and pose no threat to human and aquatic living species......

Keywords: OCPs; SPM; sediments; distribution; Bizerte lagoon.

[1]. Barhoumi B., LeMenach K., Dévier M. H., El megdiche Y., Hammami B. & Ameur B. W. 2013. Distribution and ecological risk of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) in surface sediments from the Bizerte lagoon, Tunisia. Environ Sci Pollut Res, 21, 6290-6302.
[2]. Ameur B. W., Souad T., Megdiche E. Y., Hassine B. S. & Barhoumi B. 2013. Concentration of polychlorinated biphenyls and organochlorine pesticides in mullet (Mugil cephalus) and sea bass (Dicentrarchus labrax) from Bizerte Lagoon (Northern Tunisia). Chemosphere, 90, 2372-2380.
[3]. Hassine S. B., Ameur W. B., Gandoura N. & Driss M. R. 2011. Determination of chlorinated pesticides, polychlorinated biphenyls, and polybrominated diphenyl ethers in human milk from Bizerte (Tunisia) in 201. Chemosphere, 89, 369-377.
[4]. Campo J., Masiá A., Blasco C. & Picó Y. 2013. Occurrence and removal efficiency of pesticides in sewage treatment plants of four Mediterranean River Basins. J Hazard Mater. 263, 146–157.
[5]. Castro-Jiménez J., Deviller G., Ghiani M., Loos R., Mariani G. & Skejo H. 2008. PCDD/F and PCB multi-media ambient concentrations, congener patterns and occurrence in a Mediterranean coastal lagoon (Etang de Thau, France). Environ Pollut, 156, 123–135.