Biochar Derived from Sesbania sesban Plant as a Potential Low-Cost Adsorbent for Removal of Methylene Blue

Abstract

In this study, biochar made from the Sesbania sesban plant, under slow pyrolysis at 300°C was used to adsorb methylene blue (MB) in aqueous solution. The biochar properties were clarified by diverse analytical methods such as FTIR, SEM, and BET. The results indicated that the surface of biochar was relatively smooth, had porous texture, and stacked evenly. In addition, the biochar had a large specific surface area of 561.8 m2/g and the pHpzc value was 6.9. The effect of adsorbent dosage, initial pH, contact time, and concentration of dye solution on biochar were investigated. The optimum conditions for MB adsorption were found at the MB concentration of 50 mg/L, initial pH of 11, biochar mass of 0.6 mg, and contact time of 30 min. Under these optimal conditions, MB dye removal efficiency was above 90%. Adsorption isotherm data were fitted with the Langmuir isotherm model (R2=0.897) suggesting the adsorption was monolayer, and its maximum adsorption capacity was about 6.6 mg/g. The adsorption kinetic models showed that the linear pseudo-second-order by R2=0.999 was well fitted. The results indicated the enormous potential of Sesbania sesban plant to produce biochar as a low-cost and rather high-effective adsorbent for dye removal from wastewater as well as water quality improvement.

Ball-Milled Biochar from Waste Bamboo Chopsticks: A Potential Adsorbent for Methylene Blue Removal

“…As the MB concentration increases, more MB molecules are available to interact with the biochar particles, leading to more MB molecules being adsorbed [25]. This trend is also consistent with previous studies on dye adsorption by biochar [16,[26][27]. Increasing the MB concentration generally increased the adsorption capacity but decreased the removal efficiency.…”

“…Previous studies have shown that as the amount of adsorbent increases, the adsorption capacity decreases while the MB removal efficiency increases [16,24]. In this study, a BM-WBCB dosage of 0.3 g was optimal for cost savings.…”

“…The pH drift method was used to estimate the BM-WBCB's pH at the point of zero charge (pHpzc) [16]. Initially, the pH values (pHi) of a 0.1 M NaCl solution were adjusted within the range of 2 to 12 by adding either 0.1 M HCl or 0.1 M NaOH.…”

Biochar Derived from Water Hyacinth Biomass Chemically Activated for Dye Removal in Aqueous Solution

“…Durrani et al [107] performed isothermal tests using date palm-activated biochar for the adsorption of MB in water, whose values described the best result for Langmuir, where the maximum MB adsorption capacity was 666.00 mg g −1 . Similarly, the study by Trung Hiep et al [108] presented isotherm tests using biochar from the Sesbania sesban plant for the removal of MB in water. The results were best fitted to the Langmuir model, and its maximum adsorption capacity was 6.60 mg g −1 .…”

Nghiên cứu khả năng hấp phụ xanh methylene của than sinh học sản xuất từ cành thanh long (Hylocereus Sp.)

“…Điều này chứng tỏ, tốc độ hấp phụ thuốc nhuộm MB có thể được kiểm soát phần lớn bởi một quá trình hấp phụ hóa học, kết hợp với với các đặc tính hóa học của than và MB. Kết quả này cũng tương đồng với kết quả của các công trình nghiên cứu sự hấp phụ MB lên các vật liệu khác nhau như than từ xương rồng -Opuntia ficus indica (Barka, 2013;Sakr et al, 2015), than từ cây điên điển (Hiep, 2022).…”