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331.
This study qualifies and quantifies the immobilization of Cd, Zn and Co, (used as models of bivalent metal ions due to their relevant toxicity) in filters of synthetic hydroxyapatite (HAP) [Ca5(PO4)3OH]. They were flushed with solutions containing Cd (1 x 10(-5)M), Zn and Co (1 x 10(-4)M) at constant pH (8.6) and ionic strength (0.01 M). The concentration of these metal ions in the outlet was measured by ICP-OEM spectroscopy. The software PHREEQC (version 2.4.2) was used to model sorption process and the potential effect of salinity (KCl), pH, alkalinity (NaHCO3) and hardness (CaCl2) over the efficiency of the treatment. Results showed an excellent retention capacity of HAP for Cd, Zn and Co. Sorption data were successfully described considering a mix model of surface complexation onto phosphate surface groups, ionic exchange in surface calcium sites and the precipitation of ZnO. Co exchange and surface complexation constants (Kex and Kc) were taken from previous experiments, while KexCd=0.32 and KcCd=0.63 were estimated from our modeling results. Predictive values of metal ion sorption show that: (a) an increase in hardness does not play a significant role in the retention capacity of these metals on HAP; (b) an increase in alkalinity promotes the precipitation of MeCO3 which could alter the hydrodynamic of the column; (c) a decrease in pH and an increase in salinity inhibit ZnO precipitation enhancing Zn and Cd adsorption and decreasing Co retention on HAP. 相似文献
332.
El Mountassir Otman Bahir Mohammed Ouazar Driss Chehbouni Abdelghani Carreira Paula M. 《Environmental science and pollution research international》2022,29(12):17132-17149
Environmental Science and Pollution Research - Groundwater aquifers in Morocco’s coastal regions are under serious threat as a result of climate change. This study was conducted to evaluate... 相似文献
333.
Corrêa Furtini Ana Carolina Silva Brito Flávia Maria Guimarães Junior Mario Anteveli Osajima Furtini Josy de Matos Alves Pinto Luciana de Paula Protásio Thiago Mendes Lourival Marin Guimarães Junior José Benedito 《Environmental science and pollution research international》2022,29(44):66562-66577
Environmental Science and Pollution Research - In recent years, research has been conducted in search of alternative adhesives that are less harmful to human health and the environment. Cardanol... 相似文献
334.
Sanchez Bustamante-Bailon Ana Paula Margenot Andrew Cooke Richard A. C. Christianson Laura E. 《Environmental science and pollution research international》2022,29(5):6733-6743
Environmental Science and Pollution Research - Denitrifying woodchip bioreactors are a practical nitrogen (N) mitigation technology but evaluating the potential for bioreactor phosphorus (P)... 相似文献