Adsorption of Pb 2+, Cd 2+, Cu 2+ and Cr 3+ onto titanate nanotubes: Competition and effect of inorganic ions - Liu, Wen; Ting Wang; Borthwick, Alistair GL; Wang, Yanqi; Yin, Xiaochen; Li, Xuezhao; Ni, Jinren (Science of the Total Environment, 2013)