Diclofenac (DCF), a widely used pharmaceutical ingredient, exhibits long-lasting properties and significant ecotoxicity in aquatic ecosystems. In this study, a new granular adsorbent, GSBE@C H-CTAB , was synthesized to remove DCF by initially granulating powder spent bleaching earth carbon (SBE@C) with polytetrafluoroethylene (PTFE) emulsion as a binding agent, followed by a co-modification process involving H 2 SO 4 and cetyltrimethyl ammonium bromide (CTAB). The adsorption capacity of the prepared adsorbent for DCF under the best conditions was 4.26 mg/g. In a wide pH range, GSBE@C H-CTAB could maintain a high adsorption capacity and show a good reusability. The presence of the three cations inhibited the adsorption of DCF (inhibition effect: Mg 2+ >Al 3+ >Na + ). The adsorption process conformed to the pseudo-second-order kinetic model and Langmuir isotherm model. From the theoretical evaluation results, it could be inferred that DCF molecules were adsorbed on GSBE@C H-CTAB surface in both horizontal and non-horizontal directions at all operating temperatures. The main mechanisms of adsorption included electrostatic interaction, pore filling interaction, π-π interaction and H bond interaction. The granular adsorbent GSBE@C H-CTAB prepared in this study could effectively remove DCF, treat waste with waste, and solve the problem that powder adsorbent was easy to lose and difficult to recover, which was of great significance for the remediation of polluted water.
Magnetic attapulgite/carbon supported NiFe layered double hydroxides (APT/C@NiFe-LDHs) were fabricated based on the spent bleaching earth via a facile and green hydrothermal approach. Multiple characterizations were conducted to illustrate that NiFe-LDHs was successfully anchored on the surface of APT during the preparation process. The magnetic response and adsorption properties of as-prepared composites could be facilely controlled by varying the Ni/Fe molar ratio . As expected, the coating of NiFe-LDHs significantly increased the adsorption ability to pollutants, the resultant composites prepared at the Ni/Fe molar ratio of 1:1 exhibited excellent adsorption capacities for methylene blue , Pb(II), and chlortetracycline hydrochloride of 271.28, 180.90, and 308.21 mg/g, respectively. The high adsorption capacity of the obtained adsorbents could be ascribed to the synergetic effect of the carbon species and NiFe-LDHs. In addition, the adsorbent could be easily separated by magnetic separation technology, and exhibited a stable recyclability after six adsorption-desorption cycles. This work provided a feasible pathway to design and fabricate adsorption materials for wastewater treatment taken into account both high-performance adsorption and cost-effective way.
危险品化学品经营许可证（带存储）