The Quick Removal of Toxic Dye Molecules by an Efficient Adsorptive BiOI/Bi2MoO6 Heterostructure

Abstract

Adsorption is a low-energy, economical, and efficient method for pollutant removal from water. Because of their unique structure, large specific surface area (SSA), and non-toxicity, bismuth-based semiconductors, usually researched for the photodegradation of organic molecules, are also excellent for dark adsorption processes. Here, a three-dimensional adsorbent with a heterostructure with a hydrangea-like shape made of Bi2MoO6 (BMO) and BiOI (BOI) was synthesized by a one-pot solvothermal process and investigated for the adsorption of toxic dyes. BOI/BMO with an I-to-Mo ratio of 2.0 adsorbed 98.9% of the model pollutant rhodamine B (RhB) within 5 min with a maximum adsorption capacity of 72.72 mg/g in the dark at room temperature. When compared to pure BMO, the BOI2/BMO heterostructure was 14.1 times more performant because of its flower-like morphology with multiple planes, an SSA that was 1.6-fold larger, increased porosity, the formation of heterojunctions, and a negative surface charge attracting RhB. Further investigation indicated that adsorption by BOI2/BMO fitted the pseudo-second-order kinetic and the Langmuir isotherm models. In addition, the thermodynamic analysis showed that it was a spontaneous exothermic process probably relying on physisorption. Thus, the BOI/BMO adsorbent developed here is promising for the fast removal of toxic dyes from industrial wastewater.

Cationic Waste Cotton Fabric for the Adsorptive Colorimetric Detection of Chromium Ion Traces

“…R 2 values of the two models showed that experimental data fitted better with the Langmuir isotherm model, indicating that both DPC and Cr(VI) are bound to homogeneously distributed sites onto a monolayer of the support materials (Table S2). 60 According to eq 4, the q m values of WCF for DPC and Cr(VI) were 19.32 and 8.38 mg/g, respectively. The q m value of cWCF for DPC was 32.57 and 37.34 mg/g for Cr(VI).…”

Bismuth Molybdate Nanorods Derived from a Metal–Organic Framework for Triethylamine Gas Sensors

“…Bismuth molybdate (BMO) is a low-cost and low-toxicity bimetallic oxide with an adjustable morphology and good catalytic properties. Because of these characteristics, it has been studied for a wide range of applications including as an acousto-optic nanomaterial, gas sensor, photoconductor, photocatalyst, adsorbent, ionic conductor, metabolite, and humidity sensor. − As a gas sensor, the α and γ phases of BMO have been developed to detect different VOC, but never specifically for TEA quantification. , This Aurivillius oxide is commonly synthesized by combining bismuth­(III) nitrate (BNO) with either ammonium heptamolybdate or sodium molybdate. , More recently, BMO has been derived from Bi-MOF instead of uncoordinated BNO . This synthesis method was shown to improve the performance of BMO nanoparticles for photocatalysis due to better charge separation mainly caused by the presence of intrinsic surface defects generated by the collapse of the MOF structure .…”