2D V₂C MXene/2D g-C₃N₄ nanosheet heterojunctions was exploited in this work, which almost completely removed dye pollutants (RhB and CV) with the removal ratio of 99.5%. This work is significant for the field of wastewater treatment.

This work provides a co-production and transformation technology of Cu ₂ (OH) ₂ CO ₃ , CuO to recover Cu resource from PCB etching waste solutions. The as-prepared high-purity nano-CuO (99.04 wt%) with impurity levels <0.12 wt% and Cl ⁻ <0.0015 wt%.

With the rapid development of modern society, the increasing construction of various large-scale infrastructure projects leads to the substantial generation of engineering surplus soils, greatly increasing the cost due to the pollution they cause in the surroundings. In this work, three kinds of anionic polyelectrolyte soil stabilizers [P(AA-co-AM), L-PAA, and H-PAA] were synthesized, which coordinated with sodium silicate (SS) to fabricate flowable stabilized soil (FSS), exhibiting an outstanding original fluidity of 202.33 mm, significantly exceeding the 180 mm threshold required for pumpable FSS. Meanwhile, the soil matrix stabilized by L-PAA and SS displayed the highest 28 day compressive strength of 6.25 MPa. This work presents a novel strategy for rapidly stabilizing engineering surplus soils, thereby significantly reducing the disposal cost, which is important in the field of construction engineering.

With the development of modern industry, the water pollution is getting severer which causes the huge environmental problems. In this work, the novel photocatalytic polyelectrolyte composite hydrogels based on crosslinked poly(2-acrylamido-2-methylpropane sulfonic acid) equipped with graphite carbon nitride (g-C₃N₄) were exploited via a facile preparation route, which exhibited extremely high removal ratio of 95 % and 94.5 % to Rhodamine B and tetracycline, respectively, through the synergistic effect of adsorption and photodegradation. Remarkably, the recyclability was also observed on the as-prepared hydrogels, which enabled to reuse for 15 times with the few attenuations of removal efficiency to contaminants. This study provides the new insights into the photocatalyst composite hydrogel and possesses the profound significance of the treatment of organic pollutants.