Difference analysis of organic matter-mediated heavy metal pollution in the sediments of urban water bodies.

Metal contents, forms, risks, sources, and their correlation with organic matter in the sediments of Beijing and Wuhan were studied to assess the difference in metal pollution between northern and southern China, as well as the associated coupling mechanisms with organic matter. The contents of Cr, Cu, Ni, and Zn in overlying water in Beijing were significantly higher than those in Wuhan (p < 0.01).

Asenic removal from groundwater using granular chitosan-titanium adsorbent.

Arsenic (As) contamination poses an urgent environmental risk, and its removal from groundwater remains a challenge due to the lack of efficient adsorbents. Herein, a novel granular chitosan-titanium (CS-Ti) adsorbent was fabricated by the sol-gel method. Batch experiments show that As(V) adsorption on CS-Ti followed the pseudo-second-order kinetic model, and the adsorption isotherm conformed to the Freundlich model with the correlation coefficient of 0.