Construction and demolition waste (C&D) was employed as a raw material to synthesize sorbent by fusion-hydrothermal process in order to effectively use this type of waste material. The specific surface area and the cation exchange capacity (CEC) values of the sorbent were 308.2 m2 g-1 and 625.6 mmol/100 g-1, respectively. It was found that the sorbent was quite effective for ammonium ion due to the high CEC value. The sorbent possessed high PFOS sorption capacities after load with cationic surfactant (Cetyltrimethyl Ammonium Bromide, CTAB), the sorption capacities of CTAB-modified sorbents enhanced with the increase of CTAB loading amount. This study provides an effective way for the C&D waste utilization.

In this work, we report the characteristics of ZnO nanorod (NR) arrays grown on bare Si (100) substrates by a one-step hydrothermal method, using equimolar aqueous solutions of zinc nitrate hexahydrate (Zn[NO3]2·6H2O) and hexamethy lenetetramine (C6H12N4) with concentrations of 0.01, 0.03, 0.05, and 0.10 M. For the top two precursor concentrations, 0.05 and 0.10 M, the fabricated ZnO NRs can densely distribute on the substrates; they have average diameters of 192 and 416 nm, and average lengths of 3.20 and 4.48 µm. Metal-semiconductor-metal (MSM) ultraviolet (UV) photodetectors (PDs) with interdigitated Au electrodes plated on top of the ZnO NR arrays were also evaluated. Under UV illumination of 370 nm and bias voltage of 3 V, the MSM UV PD based on ZnO NR arrays fabricated with the precursor concentration of 0.05 M has the largest photo-to-dark current contrast ratio of 47.28 among our samples, and its responsivity reaches 1.06´10-1 A/W, where the corresponding UV-to-Vis rejection ratio is 8.69.