Papers by Keyword: Lead Removal

Abstract: Heavy metals are hazardous to the environment and living creatures because they cannot be decomposed naturally. Lead is one example of a heavy metal that has a high risk of creating environmental pollution, particularly in water. In this study, the heavy metal lead content was reduced using adsorption with Sulcospira testudinaria shell as a biosorbent. The samples were treated with various conditions, such as without calcination (A), calcination at 500°C (B), and 700°C (C), which were analyzed using FTIR and XRD. Characterization data confirms the presence of functional groups on the material's surface that will interact with lead metal and CaCO₃ decomposition caused by calcination temperature treatment. The adsorption findings of lead metal ions with calcination temperature adjustments showed the best adsorption on the Sulcospira testudinaria shell adsorbent, with an adsorption efficiency (%R) of 97.7% employing material B. This research contributes to reducing solid waste from Sulcospira testudinaria shells while informing the public about how to use shell waste. It can be utilized by the government to address the issue of lead metal pollution in waters.

Abstract: The research explored the preparation of natural rubber latex foam (NRLF)/activated carbon for the removal of Lead (II) ion (Pb²⁺). The study investigated the influence of activated carbon (AC) content, ranging from 0 to 10 part per hundred of rubber (phr) while maintaining a fixed size of 80 mesh. The variation in AC content was observed to impact crosslink density and mechanical properties, with an increase in crosslink density compared to neat NRLF. Additionally, the study found a direct effect of AC content on morphology and Pb²⁺ adsorption. The highest Pb²⁺ adsorption efficiency, reaching 1.28 mg/g, was achieved with an AC content of 5 phr. This research contributed to the understanding of the interplay between AC content, material properties, and Pb²⁺ removal efficiency in the development of an innovative Pb²⁺ removal system using NRLF and coconut shell-based activated carbon on flexible substrates.

Abstract: Industrial waste containing heavy metals can pollute the aquatic environment. One method that can be done to manage heavy waste is the adsorption method that uses adsorbent from cassava stem powder. This research was conducted to utilize cassava stem powder waste for the adsorption of Pb2 + metal ions. Cassava stem powder was mashed until it passed 100 mesh sieve. Cassava stems have a cellulose content of 70-80%, lignin 15-20%, ADF 15-20% and cellulose can be used as an absorber of heavy metals. The adsorption process is carried out with variations in pH, time and concentration under optimum conditions. In this adsorption involves the functional groups contained therein so that the interaction between the adsorbent with the metal ion Pb2 +. Based on the research, the optimum conditions were obtained at pH 6, 180 minutes contact time and 50 ppm concentration. This test is carried out using Atomic Absorption Spectroscopy (AAS).

Abstract: Removing lead ion in aqueous solution using petai (Parkia speciosa) residue was done well. Petai residue is modified with sodium hydroxide and sulfuric acid before batch adsorption process occured. The results showed that the highest adsorption capacity was found in acid modification that was 2.62 mg/g.Temkin and Dubininmodels fit the adsorption isotherms of all adsorbents.

Abstract: Activated carbon was successfully generated from the mixture of corn cob and petai hull which served as adsorbents for Pb (II) ion removal at an aqueous solution. The activation was done using KOH at 800°C carbonization temperature. Synthetic waste used in the various concentration of 100, 200, 300, 400 and 500 ppm. The adsorption process was carried out at 30 minutes, the ratio of adsorbent mass was grouped as B (1:3 corn cob native activated carbon/petai hull native activated carbon), C (1:1 corn cob native activated carbon/petai hull native activated carbon), D (3:1, corn cob native activated carbon/petai hull native activated carbon), and H (1:1, corn cob modified activated carbon/petai hull modified activated carbon). The results showed that the highest adsorption capacity was found in H adsorbent that was 2,368 mg/g at concentration 300 ppm. Dubinin model fit the adsorption isotherms of B, C, D, and H.

Abstract: Preparation of the adsorbent with lead removal ability using a sulfur impregnation was studied. Coal, palm shell, waste tire and diatomite, were used as raw materials. Raw material was mixed with K₂S powder and then heated at 800 °C or 900 °C for 30 min in nitrogen to produce a sulfur-impregnated adsorbent. The sulfur-impregnated adsorbents prepared from coal, palm shell, waste tire and diatomite at 800 °C have lead removal property, and the order of lead removal ability is the adsorbent from coal = palm shell > waste tire > diatomite. The sulfur-impregnated adsorbent prepared from coal had a high sulfur content and high specific surface area. The adsorbent showed higher removal ability for lead ions from aqueous solution than zinc and cadmium ions in ternary Pb²⁺-Zn²⁺-Cd²⁺ solution. These results indicate that the sulfur-impregnated adsorbent has high selective adsorption ability for lead ions in aqueous solutions.

Abstract: The removal of lead ions from aqueous solutions was studied using a sulfur-impregnated adsorbent. Coal was mixed with K2S powder and then heated at 800°C for 30 min in nitrogen to produce a sulfur-impregnated adsorbent. The sulfur-impregnated adsorbent prepared had a high sulfur content and high specific surface area. The adsorbent showed a high removal ability for lead ions, and a high removal ratio for lead ions in binary Pb2+-Na+ and Pb2+-Mg2+ solutions. This characteristics were similar to unitary Pb2+ solutions. These results indicate that the sulfur-impregnated adsorbent has a high selective adsorption ability for lead ions in aqueous solutions.